--- /dev/null
+/*
+ * intel_hdmi_audio.c - Intel HDMI audio driver
+ *
+ * Copyright (C) 2016 Intel Corp
+ * Authors: Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>
+ * Ramesh Babu K V <ramesh.babu@intel.com>
+ * Vaibhav Agarwal <vaibhav.agarwal@intel.com>
+ * Jerome Anand <jerome.anand@intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * ALSA driver for Intel HDMI audio
+ */
+
+#define pr_fmt(fmt) "had: " fmt
+
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <asm/cacheflush.h>
+#include <sound/pcm.h>
+#include <sound/core.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+#include "intel_hdmi_audio.h"
+
+static DEFINE_MUTEX(had_mutex);
+
+/*standard module options for ALSA. This module supports only one card*/
+static int hdmi_card_index = SNDRV_DEFAULT_IDX1;
+static char *hdmi_card_id = SNDRV_DEFAULT_STR1;
+static struct snd_intelhad *had_data;
+
+module_param_named(index, hdmi_card_index, int, 0444);
+MODULE_PARM_DESC(index,
+ "Index value for INTEL Intel HDMI Audio controller.");
+module_param_named(id, hdmi_card_id, charp, 0444);
+MODULE_PARM_DESC(id,
+ "ID string for INTEL Intel HDMI Audio controller.");
+
+/*
+ * ELD SA bits in the CEA Speaker Allocation data block
+ */
+static int eld_speaker_allocation_bits[] = {
+ [0] = FL | FR,
+ [1] = LFE,
+ [2] = FC,
+ [3] = RL | RR,
+ [4] = RC,
+ [5] = FLC | FRC,
+ [6] = RLC | RRC,
+ /* the following are not defined in ELD yet */
+ [7] = 0,
+};
+
+/*
+ * This is an ordered list!
+ *
+ * The preceding ones have better chances to be selected by
+ * hdmi_channel_allocation().
+ */
+static struct cea_channel_speaker_allocation channel_allocations[] = {
+/* channel: 7 6 5 4 3 2 1 0 */
+{ .ca_index = 0x00, .speakers = { 0, 0, 0, 0, 0, 0, FR, FL } },
+ /* 2.1 */
+{ .ca_index = 0x01, .speakers = { 0, 0, 0, 0, 0, LFE, FR, FL } },
+ /* Dolby Surround */
+{ .ca_index = 0x02, .speakers = { 0, 0, 0, 0, FC, 0, FR, FL } },
+ /* surround40 */
+{ .ca_index = 0x08, .speakers = { 0, 0, RR, RL, 0, 0, FR, FL } },
+ /* surround41 */
+{ .ca_index = 0x09, .speakers = { 0, 0, RR, RL, 0, LFE, FR, FL } },
+ /* surround50 */
+{ .ca_index = 0x0a, .speakers = { 0, 0, RR, RL, FC, 0, FR, FL } },
+ /* surround51 */
+{ .ca_index = 0x0b, .speakers = { 0, 0, RR, RL, FC, LFE, FR, FL } },
+ /* 6.1 */
+{ .ca_index = 0x0f, .speakers = { 0, RC, RR, RL, FC, LFE, FR, FL } },
+ /* surround71 */
+{ .ca_index = 0x13, .speakers = { RRC, RLC, RR, RL, FC, LFE, FR, FL } },
+
+{ .ca_index = 0x03, .speakers = { 0, 0, 0, 0, FC, LFE, FR, FL } },
+{ .ca_index = 0x04, .speakers = { 0, 0, 0, RC, 0, 0, FR, FL } },
+{ .ca_index = 0x05, .speakers = { 0, 0, 0, RC, 0, LFE, FR, FL } },
+{ .ca_index = 0x06, .speakers = { 0, 0, 0, RC, FC, 0, FR, FL } },
+{ .ca_index = 0x07, .speakers = { 0, 0, 0, RC, FC, LFE, FR, FL } },
+{ .ca_index = 0x0c, .speakers = { 0, RC, RR, RL, 0, 0, FR, FL } },
+{ .ca_index = 0x0d, .speakers = { 0, RC, RR, RL, 0, LFE, FR, FL } },
+{ .ca_index = 0x0e, .speakers = { 0, RC, RR, RL, FC, 0, FR, FL } },
+{ .ca_index = 0x10, .speakers = { RRC, RLC, RR, RL, 0, 0, FR, FL } },
+{ .ca_index = 0x11, .speakers = { RRC, RLC, RR, RL, 0, LFE, FR, FL } },
+{ .ca_index = 0x12, .speakers = { RRC, RLC, RR, RL, FC, 0, FR, FL } },
+{ .ca_index = 0x14, .speakers = { FRC, FLC, 0, 0, 0, 0, FR, FL } },
+{ .ca_index = 0x15, .speakers = { FRC, FLC, 0, 0, 0, LFE, FR, FL } },
+{ .ca_index = 0x16, .speakers = { FRC, FLC, 0, 0, FC, 0, FR, FL } },
+{ .ca_index = 0x17, .speakers = { FRC, FLC, 0, 0, FC, LFE, FR, FL } },
+{ .ca_index = 0x18, .speakers = { FRC, FLC, 0, RC, 0, 0, FR, FL } },
+{ .ca_index = 0x19, .speakers = { FRC, FLC, 0, RC, 0, LFE, FR, FL } },
+{ .ca_index = 0x1a, .speakers = { FRC, FLC, 0, RC, FC, 0, FR, FL } },
+{ .ca_index = 0x1b, .speakers = { FRC, FLC, 0, RC, FC, LFE, FR, FL } },
+{ .ca_index = 0x1c, .speakers = { FRC, FLC, RR, RL, 0, 0, FR, FL } },
+{ .ca_index = 0x1d, .speakers = { FRC, FLC, RR, RL, 0, LFE, FR, FL } },
+{ .ca_index = 0x1e, .speakers = { FRC, FLC, RR, RL, FC, 0, FR, FL } },
+{ .ca_index = 0x1f, .speakers = { FRC, FLC, RR, RL, FC, LFE, FR, FL } },
+};
+
+static struct channel_map_table map_tables[] = {
+ { SNDRV_CHMAP_FL, 0x00, FL },
+ { SNDRV_CHMAP_FR, 0x01, FR },
+ { SNDRV_CHMAP_RL, 0x04, RL },
+ { SNDRV_CHMAP_RR, 0x05, RR },
+ { SNDRV_CHMAP_LFE, 0x02, LFE },
+ { SNDRV_CHMAP_FC, 0x03, FC },
+ { SNDRV_CHMAP_RLC, 0x06, RLC },
+ { SNDRV_CHMAP_RRC, 0x07, RRC },
+ {} /* terminator */
+};
+
+/* hardware capability structure */
+static const struct snd_pcm_hardware snd_intel_hadstream = {
+ .info = (SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_DOUBLE |
+ SNDRV_PCM_INFO_MMAP|
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_BATCH),
+ .formats = (SNDRV_PCM_FMTBIT_S24 |
+ SNDRV_PCM_FMTBIT_U24),
+ .rates = SNDRV_PCM_RATE_32000 |
+ SNDRV_PCM_RATE_44100 |
+ SNDRV_PCM_RATE_48000 |
+ SNDRV_PCM_RATE_88200 |
+ SNDRV_PCM_RATE_96000 |
+ SNDRV_PCM_RATE_176400 |
+ SNDRV_PCM_RATE_192000,
+ .rate_min = HAD_MIN_RATE,
+ .rate_max = HAD_MAX_RATE,
+ .channels_min = HAD_MIN_CHANNEL,
+ .channels_max = HAD_MAX_CHANNEL,
+ .buffer_bytes_max = HAD_MAX_BUFFER,
+ .period_bytes_min = HAD_MIN_PERIOD_BYTES,
+ .period_bytes_max = HAD_MAX_PERIOD_BYTES,
+ .periods_min = HAD_MIN_PERIODS,
+ .periods_max = HAD_MAX_PERIODS,
+ .fifo_size = HAD_FIFO_SIZE,
+};
+
+/* Register access functions */
+
+int had_get_hwstate(struct snd_intelhad *intelhaddata)
+{
+ /* Check for device presence -SW state */
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+ pr_debug("%s:Device not connected:%d\n", __func__,
+ intelhaddata->drv_status);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+int had_get_caps(enum had_caps_list query, void *caps)
+{
+ int retval;
+ struct snd_intelhad *intelhaddata = had_data;
+
+ retval = had_get_hwstate(intelhaddata);
+ if (!retval)
+ retval = intelhaddata->query_ops.hdmi_audio_get_caps(query,
+ caps);
+
+ return retval;
+}
+
+int had_set_caps(enum had_caps_list set_element, void *caps)
+{
+ int retval;
+ struct snd_intelhad *intelhaddata = had_data;
+
+ retval = had_get_hwstate(intelhaddata);
+ if (!retval)
+ retval = intelhaddata->query_ops.hdmi_audio_set_caps(
+ set_element, caps);
+
+ return retval;
+}
+
+int had_read_register(u32 offset, u32 *data)
+{
+ int retval;
+ struct snd_intelhad *intelhaddata = had_data;
+
+ retval = had_get_hwstate(intelhaddata);
+ if (!retval)
+ retval = intelhaddata->reg_ops.hdmi_audio_read_register(
+ offset + intelhaddata->audio_cfg_offset, data);
+
+ return retval;
+}
+
+int had_write_register(u32 offset, u32 data)
+{
+ int retval;
+ struct snd_intelhad *intelhaddata = had_data;
+
+ retval = had_get_hwstate(intelhaddata);
+ if (!retval)
+ retval = intelhaddata->reg_ops.hdmi_audio_write_register(
+ offset + intelhaddata->audio_cfg_offset, data);
+
+ return retval;
+}
+
+int had_read_modify(u32 offset, u32 data, u32 mask)
+{
+ int retval;
+ struct snd_intelhad *intelhaddata = had_data;
+
+ retval = had_get_hwstate(intelhaddata);
+ if (!retval)
+ retval = intelhaddata->reg_ops.hdmi_audio_read_modify(
+ offset + intelhaddata->audio_cfg_offset,
+ data, mask);
+
+ return retval;
+}
+/**
+ * function to read-modify
+ * AUD_CONFIG register on VLV2.The had_read_modify() function should not
+ * directly be used on VLV2 for updating AUD_CONFIG register.
+ * This is because:
+ * Bit6 of AUD_CONFIG register is writeonly due to a silicon bug on VLV2
+ * HDMI IP. As a result a read-modify of AUD_CONFIG regiter will always
+ * clear bit6. AUD_CONFIG[6:4] represents the "channels" field of the
+ * register. This field should be 1xy binary for configuration with 6 or
+ * more channels. Read-modify of AUD_CONFIG (Eg. for enabling audio)
+ * causes the "channels" field to be updated as 0xy binary resulting in
+ * bad audio. The fix is to always write the AUD_CONFIG[6:4] with
+ * appropriate value when doing read-modify of AUD_CONFIG register.
+ *
+ * @substream: the current substream or NULL if no active substream
+ * @data : data to be written
+ * @mask : mask
+ *
+ */
+static int had_read_modify_aud_config_v2(struct snd_pcm_substream *substream,
+ u32 data, u32 mask)
+{
+ union aud_cfg cfg_val = {.cfg_regval = 0};
+ u8 channels;
+
+ /*
+ * If substream is NULL, there is no active stream.
+ * In this case just set channels to 2
+ */
+ if (substream)
+ channels = substream->runtime->channels;
+ else
+ channels = 2;
+ cfg_val.cfg_regx_v2.num_ch = channels - 2;
+
+ data = data | cfg_val.cfg_regval;
+ mask = mask | AUD_CONFIG_CH_MASK_V2;
+
+ pr_debug("%s : data = %x, mask =%x\n", __func__, data, mask);
+
+ return had_read_modify(AUD_CONFIG, data, mask);
+}
+
+static void snd_intelhad_enable_audio_v1(struct snd_pcm_substream *substream,
+ u8 enable)
+{
+ had_read_modify(AUD_CONFIG, enable, BIT(0));
+}
+
+static void snd_intelhad_enable_audio_v2(struct snd_pcm_substream *substream,
+ u8 enable)
+{
+ had_read_modify_aud_config_v2(substream, enable, BIT(0));
+}
+
+static void snd_intelhad_reset_audio_v1(u8 reset)
+{
+ had_write_register(AUD_HDMI_STATUS, reset);
+}
+
+static void snd_intelhad_reset_audio_v2(u8 reset)
+{
+ had_write_register(AUD_HDMI_STATUS_v2, reset);
+}
+
+/**
+ * initialize audio channel status registers
+ * This function is called in the prepare callback
+ */
+static int had_prog_status_reg(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ union aud_cfg cfg_val = {.cfg_regval = 0};
+ union aud_ch_status_0 ch_stat0 = {.status_0_regval = 0};
+ union aud_ch_status_1 ch_stat1 = {.status_1_regval = 0};
+ int format;
+
+ pr_debug("Entry %s\n", __func__);
+
+ ch_stat0.status_0_regx.lpcm_id = (intelhaddata->aes_bits &
+ IEC958_AES0_NONAUDIO)>>1;
+ ch_stat0.status_0_regx.clk_acc = (intelhaddata->aes_bits &
+ IEC958_AES3_CON_CLOCK)>>4;
+ cfg_val.cfg_regx.val_bit = ch_stat0.status_0_regx.lpcm_id;
+
+ switch (substream->runtime->rate) {
+ case AUD_SAMPLE_RATE_32:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_32KHZ;
+ break;
+
+ case AUD_SAMPLE_RATE_44_1:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_44KHZ;
+ break;
+ case AUD_SAMPLE_RATE_48:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_48KHZ;
+ break;
+ case AUD_SAMPLE_RATE_88_2:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_88KHZ;
+ break;
+ case AUD_SAMPLE_RATE_96:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_96KHZ;
+ break;
+ case AUD_SAMPLE_RATE_176_4:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_176KHZ;
+ break;
+ case AUD_SAMPLE_RATE_192:
+ ch_stat0.status_0_regx.samp_freq = CH_STATUS_MAP_192KHZ;
+ break;
+
+ default:
+ /* control should never come here */
+ return -EINVAL;
+ break;
+
+ }
+ had_write_register(AUD_CH_STATUS_0, ch_stat0.status_0_regval);
+
+ format = substream->runtime->format;
+
+ if (format == SNDRV_PCM_FORMAT_S16_LE) {
+ ch_stat1.status_1_regx.max_wrd_len = MAX_SMPL_WIDTH_20;
+ ch_stat1.status_1_regx.wrd_len = SMPL_WIDTH_16BITS;
+ } else if (format == SNDRV_PCM_FORMAT_S24_LE) {
+ ch_stat1.status_1_regx.max_wrd_len = MAX_SMPL_WIDTH_24;
+ ch_stat1.status_1_regx.wrd_len = SMPL_WIDTH_24BITS;
+ } else {
+ ch_stat1.status_1_regx.max_wrd_len = 0;
+ ch_stat1.status_1_regx.wrd_len = 0;
+ }
+ had_write_register(AUD_CH_STATUS_1, ch_stat1.status_1_regval);
+ return 0;
+}
+
+/**
+ * function to initialize audio
+ * registers and buffer confgiuration registers
+ * This function is called in the prepare callback
+ */
+static int snd_intelhad_prog_audio_ctrl_v2(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ union aud_cfg cfg_val = {.cfg_regval = 0};
+ union aud_buf_config buf_cfg = {.buf_cfgval = 0};
+ u8 channels;
+
+ had_prog_status_reg(substream, intelhaddata);
+
+ buf_cfg.buf_cfg_regx_v2.audio_fifo_watermark = FIFO_THRESHOLD;
+ buf_cfg.buf_cfg_regx_v2.dma_fifo_watermark = DMA_FIFO_THRESHOLD;
+ buf_cfg.buf_cfg_regx_v2.aud_delay = 0;
+ had_write_register(AUD_BUF_CONFIG, buf_cfg.buf_cfgval);
+
+ channels = substream->runtime->channels;
+ cfg_val.cfg_regx_v2.num_ch = channels - 2;
+ if (channels <= 2)
+ cfg_val.cfg_regx_v2.layout = LAYOUT0;
+ else
+ cfg_val.cfg_regx_v2.layout = LAYOUT1;
+
+ had_write_register(AUD_CONFIG, cfg_val.cfg_regval);
+ return 0;
+}
+
+/**
+ * function to initialize audio
+ * registers and buffer confgiuration registers
+ * This function is called in the prepare callback
+ */
+static int snd_intelhad_prog_audio_ctrl_v1(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ union aud_cfg cfg_val = {.cfg_regval = 0};
+ union aud_buf_config buf_cfg = {.buf_cfgval = 0};
+ u8 channels;
+
+ had_prog_status_reg(substream, intelhaddata);
+
+ buf_cfg.buf_cfg_regx.fifo_width = FIFO_THRESHOLD;
+ buf_cfg.buf_cfg_regx.aud_delay = 0;
+ had_write_register(AUD_BUF_CONFIG, buf_cfg.buf_cfgval);
+
+ channels = substream->runtime->channels;
+
+ switch (channels) {
+ case 1:
+ case 2:
+ cfg_val.cfg_regx.num_ch = CH_STEREO;
+ cfg_val.cfg_regx.layout = LAYOUT0;
+ break;
+
+ case 3:
+ case 4:
+ cfg_val.cfg_regx.num_ch = CH_THREE_FOUR;
+ cfg_val.cfg_regx.layout = LAYOUT1;
+ break;
+
+ case 5:
+ case 6:
+ cfg_val.cfg_regx.num_ch = CH_FIVE_SIX;
+ cfg_val.cfg_regx.layout = LAYOUT1;
+ break;
+
+ case 7:
+ case 8:
+ cfg_val.cfg_regx.num_ch = CH_SEVEN_EIGHT;
+ cfg_val.cfg_regx.layout = LAYOUT1;
+ break;
+
+ }
+
+ had_write_register(AUD_CONFIG, cfg_val.cfg_regval);
+ return 0;
+}
+
+/*
+ * Compute derived values in channel_allocations[].
+ */
+static void init_channel_allocations(void)
+{
+ int i, j;
+ struct cea_channel_speaker_allocation *p;
+
+ pr_debug("%s: Enter\n", __func__);
+
+ for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+ p = channel_allocations + i;
+ p->channels = 0;
+ p->spk_mask = 0;
+ for (j = 0; j < ARRAY_SIZE(p->speakers); j++)
+ if (p->speakers[j]) {
+ p->channels++;
+ p->spk_mask |= p->speakers[j];
+ }
+ }
+}
+
+/*
+ * The transformation takes two steps:
+ *
+ * eld->spk_alloc => (eld_speaker_allocation_bits[]) => spk_mask
+ * spk_mask => (channel_allocations[]) => ai->CA
+ *
+ * TODO: it could select the wrong CA from multiple candidates.
+ */
+static int snd_intelhad_channel_allocation(struct snd_intelhad *intelhaddata,
+ int channels)
+{
+ int i;
+ int ca = 0;
+ int spk_mask = 0;
+
+ /*
+ * CA defaults to 0 for basic stereo audio
+ */
+ if (channels <= 2)
+ return 0;
+
+ /*
+ * expand ELD's speaker allocation mask
+ *
+ * ELD tells the speaker mask in a compact(paired) form,
+ * expand ELD's notions to match the ones used by Audio InfoFrame.
+ */
+
+ for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
+ if (intelhaddata->eeld.speaker_allocation_block & (1 << i))
+ spk_mask |= eld_speaker_allocation_bits[i];
+ }
+
+ /* search for the first working match in the CA table */
+ for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+ if (channels == channel_allocations[i].channels &&
+ (spk_mask & channel_allocations[i].spk_mask) ==
+ channel_allocations[i].spk_mask) {
+ ca = channel_allocations[i].ca_index;
+ break;
+ }
+ }
+
+ pr_debug("HDMI: select CA 0x%x for %d\n", ca, channels);
+
+ return ca;
+}
+
+/* from speaker bit mask to ALSA API channel position */
+static int spk_to_chmap(int spk)
+{
+ struct channel_map_table *t = map_tables;
+
+ for (; t->map; t++) {
+ if (t->spk_mask == spk)
+ return t->map;
+ }
+ return 0;
+}
+
+void had_build_channel_allocation_map(struct snd_intelhad *intelhaddata)
+{
+ int i = 0, c = 0;
+ int spk_mask = 0;
+ struct snd_pcm_chmap_elem *chmap;
+ u8 eld_high, eld_high_mask = 0xF0;
+ u8 high_msb;
+
+ chmap = kzalloc(sizeof(*chmap), GFP_KERNEL);
+ if (chmap == NULL) {
+ intelhaddata->chmap->chmap = NULL;
+ return;
+ }
+
+ had_get_caps(HAD_GET_ELD, &intelhaddata->eeld);
+
+ pr_debug("eeld.speaker_allocation_block = %x\n",
+ intelhaddata->eeld.speaker_allocation_block);
+
+ /* WA: Fix the max channel supported to 8 */
+
+ /*
+ * Sink may support more than 8 channels, if eld_high has more than
+ * one bit set. SOC supports max 8 channels.
+ * Refer eld_speaker_allocation_bits, for sink speaker allocation
+ */
+
+ /* if 0x2F < eld < 0x4F fall back to 0x2f, else fall back to 0x4F */
+ eld_high = intelhaddata->eeld.speaker_allocation_block & eld_high_mask;
+ if ((eld_high & (eld_high-1)) && (eld_high > 0x1F)) {
+ /* eld_high & (eld_high-1): if more than 1 bit set */
+ /* 0x1F: 7 channels */
+ for (i = 1; i < 4; i++) {
+ high_msb = eld_high & (0x80 >> i);
+ if (high_msb) {
+ intelhaddata->eeld.speaker_allocation_block &=
+ high_msb | 0xF;
+ break;
+ }
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(eld_speaker_allocation_bits); i++) {
+ if (intelhaddata->eeld.speaker_allocation_block & (1 << i))
+ spk_mask |= eld_speaker_allocation_bits[i];
+ }
+
+ for (i = 0; i < ARRAY_SIZE(channel_allocations); i++) {
+ if (spk_mask == channel_allocations[i].spk_mask) {
+ for (c = 0; c < channel_allocations[i].channels; c++) {
+ chmap->map[c] = spk_to_chmap(
+ channel_allocations[i].speakers[
+ (MAX_SPEAKERS - 1)-c]);
+ }
+ chmap->channels = channel_allocations[i].channels;
+ intelhaddata->chmap->chmap = chmap;
+ break;
+ }
+ }
+ if (i >= ARRAY_SIZE(channel_allocations)) {
+ intelhaddata->chmap->chmap = NULL;
+ kfree(chmap);
+ }
+}
+
+/*
+ * ALSA API channel-map control callbacks
+ */
+static int had_chmap_ctl_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+ struct snd_intelhad *intelhaddata = info->private_data;
+
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED)
+ return -ENODEV;
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = HAD_MAX_CHANNEL;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = SNDRV_CHMAP_LAST;
+ return 0;
+}
+
+static int had_chmap_ctl_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
+ struct snd_intelhad *intelhaddata = info->private_data;
+ int i = 0;
+ const struct snd_pcm_chmap_elem *chmap;
+
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED)
+ return -ENODEV;
+ if (intelhaddata->chmap->chmap == NULL)
+ return -ENODATA;
+ chmap = intelhaddata->chmap->chmap;
+ for (i = 0; i < chmap->channels; i++) {
+ ucontrol->value.integer.value[i] = chmap->map[i];
+ pr_debug("chmap->map[%d] = %d\n", i, chmap->map[i]);
+ }
+
+ return 0;
+}
+
+static int had_register_chmap_ctls(struct snd_intelhad *intelhaddata,
+ struct snd_pcm *pcm)
+{
+ int err = 0;
+
+ err = snd_pcm_add_chmap_ctls(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+ NULL, 0, (unsigned long)intelhaddata,
+ &intelhaddata->chmap);
+ if (err < 0)
+ return err;
+
+ intelhaddata->chmap->private_data = intelhaddata;
+ intelhaddata->kctl = intelhaddata->chmap->kctl;
+ intelhaddata->kctl->info = had_chmap_ctl_info;
+ intelhaddata->kctl->get = had_chmap_ctl_get;
+ intelhaddata->chmap->chmap = NULL;
+ return 0;
+}
+
+/**
+ * snd_intelhad_prog_dip_v1 - to initialize Data Island Packets registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+static void snd_intelhad_prog_dip_v1(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ int i;
+ union aud_ctrl_st ctrl_state = {.ctrl_val = 0};
+ union aud_info_frame2 frame2 = {.fr2_val = 0};
+ union aud_info_frame3 frame3 = {.fr3_val = 0};
+ u8 checksum = 0;
+ int channels;
+
+ channels = substream->runtime->channels;
+
+ had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+
+ frame2.fr2_regx.chnl_cnt = substream->runtime->channels - 1;
+
+ frame3.fr3_regx.chnl_alloc = snd_intelhad_channel_allocation(
+ intelhaddata, channels);
+
+ /*Calculte the byte wide checksum for all valid DIP words*/
+ for (i = 0; i < BYTES_PER_WORD; i++)
+ checksum += (INFO_FRAME_WORD1 >> i*BITS_PER_BYTE) & MASK_BYTE0;
+ for (i = 0; i < BYTES_PER_WORD; i++)
+ checksum += (frame2.fr2_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+ for (i = 0; i < BYTES_PER_WORD; i++)
+ checksum += (frame3.fr3_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+
+ frame2.fr2_regx.chksum = -(checksum);
+
+ had_write_register(AUD_HDMIW_INFOFR, INFO_FRAME_WORD1);
+ had_write_register(AUD_HDMIW_INFOFR, frame2.fr2_val);
+ had_write_register(AUD_HDMIW_INFOFR, frame3.fr3_val);
+
+ /* program remaining DIP words with zero */
+ for (i = 0; i < HAD_MAX_DIP_WORDS-VALID_DIP_WORDS; i++)
+ had_write_register(AUD_HDMIW_INFOFR, 0x0);
+
+ ctrl_state.ctrl_regx.dip_freq = 1;
+ ctrl_state.ctrl_regx.dip_en_sta = 1;
+ had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+}
+
+/**
+ * snd_intelhad_prog_dip_v2 - to initialize Data Island Packets registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback
+ */
+static void snd_intelhad_prog_dip_v2(struct snd_pcm_substream *substream,
+ struct snd_intelhad *intelhaddata)
+{
+ int i;
+ union aud_ctrl_st ctrl_state = {.ctrl_val = 0};
+ union aud_info_frame2 frame2 = {.fr2_val = 0};
+ union aud_info_frame3 frame3 = {.fr3_val = 0};
+ u8 checksum = 0;
+ int channels;
+
+ channels = substream->runtime->channels;
+
+ had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+
+ frame2.fr2_regx.chnl_cnt = substream->runtime->channels - 1;
+
+ frame3.fr3_regx.chnl_alloc = snd_intelhad_channel_allocation(
+ intelhaddata, channels);
+
+ /*Calculte the byte wide checksum for all valid DIP words*/
+ for (i = 0; i < BYTES_PER_WORD; i++)
+ checksum += (INFO_FRAME_WORD1 >> i*BITS_PER_BYTE) & MASK_BYTE0;
+ for (i = 0; i < BYTES_PER_WORD; i++)
+ checksum += (frame2.fr2_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+ for (i = 0; i < BYTES_PER_WORD; i++)
+ checksum += (frame3.fr3_val >> i*BITS_PER_BYTE) & MASK_BYTE0;
+
+ frame2.fr2_regx.chksum = -(checksum);
+
+ had_write_register(AUD_HDMIW_INFOFR_v2, INFO_FRAME_WORD1);
+ had_write_register(AUD_HDMIW_INFOFR_v2, frame2.fr2_val);
+ had_write_register(AUD_HDMIW_INFOFR_v2, frame3.fr3_val);
+
+ /* program remaining DIP words with zero */
+ for (i = 0; i < HAD_MAX_DIP_WORDS-VALID_DIP_WORDS; i++)
+ had_write_register(AUD_HDMIW_INFOFR_v2, 0x0);
+
+ ctrl_state.ctrl_regx.dip_freq = 1;
+ ctrl_state.ctrl_regx.dip_en_sta = 1;
+ had_write_register(AUD_CNTL_ST, ctrl_state.ctrl_val);
+}
+
+/**
+ * snd_intelhad_prog_buffer - programs buffer
+ * address and length registers
+ *
+ * @substream:substream for which the prepare function is called
+ * @intelhaddata:substream private data
+ *
+ * This function programs ring buffer address and length into registers.
+ */
+int snd_intelhad_prog_buffer(struct snd_intelhad *intelhaddata,
+ int start, int end)
+{
+ u32 ring_buf_addr, ring_buf_size, period_bytes;
+ u8 i, num_periods;
+ struct snd_pcm_substream *substream;
+
+ substream = intelhaddata->stream_info.had_substream;
+ if (!substream) {
+ pr_err("substream is NULL\n");
+ dump_stack();
+ return 0;
+ }
+
+ ring_buf_addr = substream->runtime->dma_addr;
+ ring_buf_size = snd_pcm_lib_buffer_bytes(substream);
+ intelhaddata->stream_info.ring_buf_size = ring_buf_size;
+ period_bytes = frames_to_bytes(substream->runtime,
+ substream->runtime->period_size);
+ num_periods = substream->runtime->periods;
+
+ /*
+ * buffer addr should be 64 byte aligned, period bytes
+ * will be used to calculate addr offset
+ */
+ period_bytes &= ~0x3F;
+
+ /* Hardware supports MAX_PERIODS buffers */
+ if (end >= HAD_MAX_PERIODS)
+ return -EINVAL;
+
+ for (i = start; i <= end; i++) {
+ /* Program the buf registers with addr and len */
+ intelhaddata->buf_info[i].buf_addr = ring_buf_addr +
+ (i * period_bytes);
+ if (i < num_periods-1)
+ intelhaddata->buf_info[i].buf_size = period_bytes;
+ else
+ intelhaddata->buf_info[i].buf_size = ring_buf_size -
+ (period_bytes*i);
+
+ had_write_register(AUD_BUF_A_ADDR + (i * HAD_REG_WIDTH),
+ intelhaddata->buf_info[i].buf_addr |
+ BIT(0) | BIT(1));
+ had_write_register(AUD_BUF_A_LENGTH + (i * HAD_REG_WIDTH),
+ period_bytes);
+ intelhaddata->buf_info[i].is_valid = true;
+ }
+ pr_debug("%s:buf[%d-%d] addr=%#x and size=%d\n", __func__, start, end,
+ intelhaddata->buf_info[start].buf_addr,
+ intelhaddata->buf_info[start].buf_size);
+ intelhaddata->valid_buf_cnt = num_periods;
+ return 0;
+}
+
+int snd_intelhad_read_len(struct snd_intelhad *intelhaddata)
+{
+ int i, retval = 0;
+ u32 len[4];
+
+ for (i = 0; i < 4 ; i++) {
+ had_read_register(AUD_BUF_A_LENGTH + (i * HAD_REG_WIDTH),
+ &len[i]);
+ if (!len[i])
+ retval++;
+ }
+ if (retval != 1) {
+ for (i = 0; i < 4 ; i++)
+ pr_debug("buf[%d] size=%d\n", i, len[i]);
+ }
+
+ return retval;
+}
+
+/**
+ * snd_intelhad_prog_cts_v1 - Program HDMI audio CTS value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @tmds: sampling frequency of the display data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * Program CTS register based on the audio and display sampling frequency
+ */
+static void snd_intelhad_prog_cts_v1(u32 aud_samp_freq, u32 tmds, u32 n_param,
+ struct snd_intelhad *intelhaddata)
+{
+ u32 cts_val;
+ u64 dividend, divisor;
+
+ /* Calculate CTS according to HDMI 1.3a spec*/
+ dividend = (u64)tmds * n_param*1000;
+ divisor = 128 * aud_samp_freq;
+ cts_val = div64_u64(dividend, divisor);
+ pr_debug("TMDS value=%d, N value=%d, CTS Value=%d\n",
+ tmds, n_param, cts_val);
+ had_write_register(AUD_HDMI_CTS, (BIT(20) | cts_val));
+}
+
+/**
+ * snd_intelhad_prog_cts_v2 - Program HDMI audio CTS value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @tmds: sampling frequency of the display data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * Program CTS register based on the audio and display sampling frequency
+ */
+static void snd_intelhad_prog_cts_v2(u32 aud_samp_freq, u32 tmds, u32 n_param,
+ struct snd_intelhad *intelhaddata)
+{
+ u32 cts_val;
+ u64 dividend, divisor;
+
+ /* Calculate CTS according to HDMI 1.3a spec*/
+ dividend = (u64)tmds * n_param*1000;
+ divisor = 128 * aud_samp_freq;
+ cts_val = div64_u64(dividend, divisor);
+ pr_debug("TMDS value=%d, N value=%d, CTS Value=%d\n",
+ tmds, n_param, cts_val);
+ had_write_register(AUD_HDMI_CTS, (BIT(24) | cts_val));
+}
+
+static int had_calculate_n_value(u32 aud_samp_freq)
+{
+ s32 n_val;
+
+ /* Select N according to HDMI 1.3a spec*/
+ switch (aud_samp_freq) {
+ case AUD_SAMPLE_RATE_32:
+ n_val = 4096;
+ break;
+
+ case AUD_SAMPLE_RATE_44_1:
+ n_val = 6272;
+ break;
+
+ case AUD_SAMPLE_RATE_48:
+ n_val = 6144;
+ break;
+
+ case AUD_SAMPLE_RATE_88_2:
+ n_val = 12544;
+ break;
+
+ case AUD_SAMPLE_RATE_96:
+ n_val = 12288;
+ break;
+
+ case AUD_SAMPLE_RATE_176_4:
+ n_val = 25088;
+ break;
+
+ case HAD_MAX_RATE:
+ n_val = 24576;
+ break;
+
+ default:
+ n_val = -EINVAL;
+ break;
+ }
+ return n_val;
+}
+
+/**
+ * snd_intelhad_prog_n_v1 - Program HDMI audio N value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback.
+ * It programs based on the audio and display sampling frequency
+ */
+static int snd_intelhad_prog_n_v1(u32 aud_samp_freq, u32 *n_param,
+ struct snd_intelhad *intelhaddata)
+{
+ s32 n_val;
+
+ n_val = had_calculate_n_value(aud_samp_freq);
+
+ if (n_val < 0)
+ return n_val;
+
+ had_write_register(AUD_N_ENABLE, (BIT(20) | n_val));
+ *n_param = n_val;
+ return 0;
+}
+
+/**
+ * snd_intelhad_prog_n_v2 - Program HDMI audio N value
+ *
+ * @aud_samp_freq: sampling frequency of audio data
+ * @n_param: N value, depends on aud_samp_freq
+ * @intelhaddata:substream private data
+ *
+ * This function is called in the prepare callback.
+ * It programs based on the audio and display sampling frequency
+ */
+static int snd_intelhad_prog_n_v2(u32 aud_samp_freq, u32 *n_param,
+ struct snd_intelhad *intelhaddata)
+{
+ s32 n_val;
+
+ n_val = had_calculate_n_value(aud_samp_freq);
+
+ if (n_val < 0)
+ return n_val;
+
+ had_write_register(AUD_N_ENABLE, (BIT(24) | n_val));
+ *n_param = n_val;
+ return 0;
+}
+
+static void had_clear_underrun_intr_v1(struct snd_intelhad *intelhaddata)
+{
+ u32 hdmi_status, i = 0;
+
+ /* Handle Underrun interrupt within Audio Unit */
+ had_write_register(AUD_CONFIG, 0);
+ /* Reset buffer pointers */
+ had_write_register(AUD_HDMI_STATUS, 1);
+ had_write_register(AUD_HDMI_STATUS, 0);
+ /**
+ * The interrupt status 'sticky' bits might not be cleared by
+ * setting '1' to that bit once...
+ */
+ do { /* clear bit30, 31 AUD_HDMI_STATUS */
+ had_read_register(AUD_HDMI_STATUS, &hdmi_status);
+ pr_debug("HDMI status =0x%x\n", hdmi_status);
+ if (hdmi_status & AUD_CONFIG_MASK_UNDERRUN) {
+ i++;
+ hdmi_status &= (AUD_CONFIG_MASK_SRDBG |
+ AUD_CONFIG_MASK_FUNCRST);
+ hdmi_status |= ~AUD_CONFIG_MASK_UNDERRUN;
+ had_write_register(AUD_HDMI_STATUS, hdmi_status);
+ } else
+ break;
+ } while (i < MAX_CNT);
+ if (i >= MAX_CNT)
+ pr_err("Unable to clear UNDERRUN bits\n");
+}
+
+static void had_clear_underrun_intr_v2(struct snd_intelhad *intelhaddata)
+{
+ u32 hdmi_status, i = 0;
+
+ /* Handle Underrun interrupt within Audio Unit */
+ had_write_register(AUD_CONFIG, 0);
+ /* Reset buffer pointers */
+ had_write_register(AUD_HDMI_STATUS_v2, 1);
+ had_write_register(AUD_HDMI_STATUS_v2, 0);
+ /**
+ * The interrupt status 'sticky' bits might not be cleared by
+ * setting '1' to that bit once...
+ */
+ do { /* clear bit30, 31 AUD_HDMI_STATUS */
+ had_read_register(AUD_HDMI_STATUS_v2, &hdmi_status);
+ pr_debug("HDMI status =0x%x\n", hdmi_status);
+ if (hdmi_status & AUD_CONFIG_MASK_UNDERRUN) {
+ i++;
+ had_write_register(AUD_HDMI_STATUS_v2, hdmi_status);
+ } else
+ break;
+ } while (i < MAX_CNT);
+ if (i >= MAX_CNT)
+ pr_err("Unable to clear UNDERRUN bits\n");
+}
+
+/**
+ * snd_intelhad_open - stream initializations are done here
+ * @substream:substream for which the stream function is called
+ *
+ * This function is called whenever a PCM stream is opened
+ */
+static int snd_intelhad_open(struct snd_pcm_substream *substream)
+{
+ struct snd_intelhad *intelhaddata;
+ struct snd_pcm_runtime *runtime;
+ struct had_stream_pvt *stream;
+ struct had_pvt_data *had_stream;
+ int retval;
+
+ pr_debug("snd_intelhad_open called\n");
+ intelhaddata = snd_pcm_substream_chip(substream);
+ had_stream = intelhaddata->private_data;
+ runtime = substream->runtime;
+
+ pm_runtime_get(intelhaddata->dev);
+
+ if (had_get_hwstate(intelhaddata)) {
+ pr_err("%s: HDMI cable plugged-out\n", __func__);
+ retval = -ENODEV;
+ goto exit_put_handle;
+ }
+
+ /* Check, if device already in use */
+ if (runtime->private_data) {
+ pr_err("Device already in use\n");
+ retval = -EBUSY;
+ goto exit_put_handle;
+ }
+
+ /* set the runtime hw parameter with local snd_pcm_hardware struct */
+ runtime->hw = snd_intel_hadstream;
+
+ stream = kzalloc(sizeof(*stream), GFP_KERNEL);
+ if (!stream) {
+ retval = -ENOMEM;
+ goto exit_put_handle;
+ }
+ stream->stream_status = STREAM_INIT;
+ runtime->private_data = stream;
+
+ retval = snd_pcm_hw_constraint_integer(runtime,
+ SNDRV_PCM_HW_PARAM_PERIODS);
+ if (retval < 0)
+ goto exit_err;
+
+ /* Make sure, that the period size is always aligned
+ * 64byte boundary
+ */
+ retval = snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 64);
+ if (retval < 0) {
+ pr_err("%s:step_size=64 failed,err=%d\n", __func__, retval);
+ goto exit_err;
+ }
+
+ return retval;
+exit_err:
+ kfree(stream);
+exit_put_handle:
+ pm_runtime_put(intelhaddata->dev);
+ runtime->private_data = NULL;
+ return retval;
+}
+
+/**
+ * had_period_elapsed - updates the hardware pointer status
+ * @had_substream:substream for which the stream function is called
+ *
+ */
+static void had_period_elapsed(void *had_substream)
+{
+ struct snd_pcm_substream *substream = had_substream;
+ struct had_stream_pvt *stream;
+
+ /* pr_debug("had_period_elapsed called\n"); */
+
+ if (!substream || !substream->runtime)
+ return;
+ stream = substream->runtime->private_data;
+ if (!stream)
+ return;
+
+ if (stream->stream_status != STREAM_RUNNING)
+ return;
+ snd_pcm_period_elapsed(substream);
+}
+
+/**
+ * snd_intelhad_init_stream - internal function to initialize stream info
+ * @substream:substream for which the stream function is called
+ *
+ */
+static int snd_intelhad_init_stream(struct snd_pcm_substream *substream)
+{
+ struct snd_intelhad *intelhaddata = snd_pcm_substream_chip(substream);
+
+ pr_debug("snd_intelhad_init_stream called\n");
+
+ pr_debug("setting buffer ptr param\n");
+ intelhaddata->stream_info.period_elapsed = had_period_elapsed;
+ intelhaddata->stream_info.had_substream = substream;
+ intelhaddata->stream_info.buffer_ptr = 0;
+ intelhaddata->stream_info.buffer_rendered = 0;
+ intelhaddata->stream_info.sfreq = substream->runtime->rate;
+ return 0;
+}
+
+/**
+ * snd_intelhad_close- to free parameteres when stream is stopped
+ *
+ * @substream: substream for which the function is called
+ *
+ * This function is called by ALSA framework when stream is stopped
+ */
+static int snd_intelhad_close(struct snd_pcm_substream *substream)
+{
+ struct snd_intelhad *intelhaddata;
+ struct snd_pcm_runtime *runtime;
+
+ pr_debug("snd_intelhad_close called\n");
+
+ intelhaddata = snd_pcm_substream_chip(substream);
+ runtime = substream->runtime;
+
+ if (!runtime->private_data) {
+ pr_debug("close() might have called after failed open");
+ return 0;
+ }
+
+ intelhaddata->stream_info.buffer_rendered = 0;
+ intelhaddata->stream_info.buffer_ptr = 0;
+ intelhaddata->stream_info.str_id = 0;
+ intelhaddata->stream_info.had_substream = NULL;
+
+ /* Check if following drv_status modification is required - VA */
+ if (intelhaddata->drv_status != HAD_DRV_DISCONNECTED) {
+ intelhaddata->drv_status = HAD_DRV_CONNECTED;
+ pr_debug("%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_CONNECTED\n",
+ __func__, __LINE__);
+ }
+ kfree(runtime->private_data);
+ runtime->private_data = NULL;
+ pm_runtime_put(intelhaddata->dev);
+ return 0;
+}
+
+/**
+ * snd_intelhad_hw_params- to setup the hardware parameters
+ * like allocating the buffers
+ *
+ * @substream: substream for which the function is called
+ * @hw_params: hardware parameters
+ *
+ * This function is called by ALSA framework when hardware params are set
+ */
+static int snd_intelhad_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *hw_params)
+{
+ unsigned long addr;
+ int pages, buf_size, retval;
+
+ pr_debug("snd_intelhad_hw_params called\n");
+
+ if (!hw_params)
+ return -EINVAL;
+
+ buf_size = params_buffer_bytes(hw_params);
+ retval = snd_pcm_lib_malloc_pages(substream, buf_size);
+ if (retval < 0)
+ return retval;
+ pr_debug("%s:allocated memory = %d\n", __func__, buf_size);
+ /* mark the pages as uncached region */
+ addr = (unsigned long) substream->runtime->dma_area;
+ pages = (substream->runtime->dma_bytes + PAGE_SIZE - 1) / PAGE_SIZE;
+ retval = set_memory_uc(addr, pages);
+ if (retval) {
+ pr_err("set_memory_uc failed.Error:%d\n", retval);
+ return retval;
+ }
+ memset(substream->runtime->dma_area, 0, buf_size);
+
+ return retval;
+}
+
+/**
+ * snd_intelhad_hw_free- to release the resources allocated during
+ * hardware params setup
+ *
+ * @substream: substream for which the function is called
+ *
+ * This function is called by ALSA framework before close callback.
+ *
+ */
+static int snd_intelhad_hw_free(struct snd_pcm_substream *substream)
+{
+ unsigned long addr;
+ u32 pages;
+
+ pr_debug("snd_intelhad_hw_free called\n");
+
+ /* mark back the pages as cached/writeback region before the free */
+ if (substream->runtime->dma_area != NULL) {
+ addr = (unsigned long) substream->runtime->dma_area;
+ pages = (substream->runtime->dma_bytes + PAGE_SIZE - 1) /
+ PAGE_SIZE;
+ set_memory_wb(addr, pages);
+ return snd_pcm_lib_free_pages(substream);
+ }
+ return 0;
+}
+
+/**
+ * snd_intelhad_pcm_trigger - stream activities are handled here
+ * @substream:substream for which the stream function is called
+ * @cmd:the stream commamd thats requested from upper layer
+ * This function is called whenever an a stream activity is invoked
+ */
+static int snd_intelhad_pcm_trigger(struct snd_pcm_substream *substream,
+ int cmd)
+{
+ int caps, retval = 0;
+ unsigned long flag_irq;
+ struct snd_intelhad *intelhaddata;
+ struct had_stream_pvt *stream;
+ struct had_pvt_data *had_stream;
+
+ pr_debug("snd_intelhad_pcm_trigger called\n");
+
+ intelhaddata = snd_pcm_substream_chip(substream);
+ stream = substream->runtime->private_data;
+ had_stream = intelhaddata->private_data;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ pr_debug("Trigger Start\n");
+
+ /* Disable local INTRs till register prgmng is done */
+ if (had_get_hwstate(intelhaddata)) {
+ pr_err("_START: HDMI cable plugged-out\n");
+ retval = -ENODEV;
+ break;
+ }
+ stream->stream_status = STREAM_RUNNING;
+
+ had_stream->stream_type = HAD_RUNNING_STREAM;
+
+ /* Enable Audio */
+ /*
+ * ToDo: Need to enable UNDERRUN interrupts as well
+ * caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+ */
+ caps = HDMI_AUDIO_BUFFER_DONE;
+ retval = had_set_caps(HAD_SET_ENABLE_AUDIO_INT, &caps);
+ retval = had_set_caps(HAD_SET_ENABLE_AUDIO, NULL);
+ intelhaddata->ops->enable_audio(substream, 1);
+
+ pr_debug("Processed _Start\n");
+
+ break;
+
+ case SNDRV_PCM_TRIGGER_STOP:
+ pr_debug("Trigger Stop\n");
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irq);
+ intelhaddata->stream_info.str_id = 0;
+ intelhaddata->curr_buf = 0;
+
+ /* Stop reporting BUFFER_DONE/UNDERRUN to above layers*/
+
+ had_stream->stream_type = HAD_INIT;
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irq);
+ /* Disable Audio */
+ /*
+ * ToDo: Need to disable UNDERRUN interrupts as well
+ * caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+ */
+ caps = HDMI_AUDIO_BUFFER_DONE;
+ had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+ intelhaddata->ops->enable_audio(substream, 0);
+ /* Reset buffer pointers */
+ intelhaddata->ops->reset_audio(1);
+ intelhaddata->ops->reset_audio(0);
+ stream->stream_status = STREAM_DROPPED;
+ had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+ break;
+
+ default:
+ retval = -EINVAL;
+ }
+ return retval;
+}
+
+/**
+ * snd_intelhad_pcm_prepare- internal preparation before starting a stream
+ *
+ * @substream: substream for which the function is called
+ *
+ * This function is called when a stream is started for internal preparation.
+ */
+static int snd_intelhad_pcm_prepare(struct snd_pcm_substream *substream)
+{
+ int retval;
+ u32 disp_samp_freq, n_param;
+ struct snd_intelhad *intelhaddata;
+ struct snd_pcm_runtime *runtime;
+ struct had_pvt_data *had_stream;
+
+ pr_debug("snd_intelhad_pcm_prepare called\n");
+
+ intelhaddata = snd_pcm_substream_chip(substream);
+ runtime = substream->runtime;
+ had_stream = intelhaddata->private_data;
+
+ if (had_get_hwstate(intelhaddata)) {
+ pr_err("%s: HDMI cable plugged-out\n", __func__);
+ retval = -ENODEV;
+ goto prep_end;
+ }
+
+ pr_debug("period_size=%d\n",
+ (int)frames_to_bytes(runtime, runtime->period_size));
+ pr_debug("periods=%d\n", runtime->periods);
+ pr_debug("buffer_size=%d\n", (int)snd_pcm_lib_buffer_bytes(substream));
+ pr_debug("rate=%d\n", runtime->rate);
+ pr_debug("channels=%d\n", runtime->channels);
+
+ if (intelhaddata->stream_info.str_id) {
+ pr_debug("_prepare is called for existing str_id#%d\n",
+ intelhaddata->stream_info.str_id);
+ retval = snd_intelhad_pcm_trigger(substream,
+ SNDRV_PCM_TRIGGER_STOP);
+ return retval;
+ }
+
+ retval = snd_intelhad_init_stream(substream);
+ if (retval)
+ goto prep_end;
+
+
+ /* Get N value in KHz */
+ retval = had_get_caps(HAD_GET_DISPLAY_RATE, &disp_samp_freq);
+ if (retval) {
+ pr_err("querying display sampling freq failed %#x\n", retval);
+ goto prep_end;
+ }
+
+ had_get_caps(HAD_GET_ELD, &intelhaddata->eeld);
+
+ retval = intelhaddata->ops->prog_n(substream->runtime->rate, &n_param,
+ intelhaddata);
+ if (retval) {
+ pr_err("programming N value failed %#x\n", retval);
+ goto prep_end;
+ }
+ intelhaddata->ops->prog_cts(substream->runtime->rate,
+ disp_samp_freq, n_param, intelhaddata);
+
+ intelhaddata->ops->prog_dip(substream, intelhaddata);
+
+ retval = intelhaddata->ops->audio_ctrl(substream, intelhaddata);
+
+ /* Prog buffer address */
+ retval = snd_intelhad_prog_buffer(intelhaddata,
+ HAD_BUF_TYPE_A, HAD_BUF_TYPE_D);
+
+ /*
+ * Program channel mapping in following order:
+ * FL, FR, C, LFE, RL, RR
+ */
+
+ had_write_register(AUD_BUF_CH_SWAP, SWAP_LFE_CENTER);
+
+prep_end:
+ return retval;
+}
+
+/**
+ * snd_intelhad_pcm_pointer- to send the current buffer pointerprocessed by hw
+ *
+ * @substream: substream for which the function is called
+ *
+ * This function is called by ALSA framework to get the current hw buffer ptr
+ * when a period is elapsed
+ */
+static snd_pcm_uframes_t snd_intelhad_pcm_pointer(
+ struct snd_pcm_substream *substream)
+{
+ struct snd_intelhad *intelhaddata;
+ u32 bytes_rendered = 0;
+ u32 t;
+ int buf_id;
+
+ /* pr_debug("snd_intelhad_pcm_pointer called\n"); */
+
+ intelhaddata = snd_pcm_substream_chip(substream);
+
+ if (intelhaddata->flag_underrun) {
+ intelhaddata->flag_underrun = 0;
+ return SNDRV_PCM_POS_XRUN;
+ }
+
+ /* Use a hw register to calculate sub-period position reports.
+ * This makes PulseAudio happier.
+ */
+
+ buf_id = intelhaddata->curr_buf % 4;
+ had_read_register(AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH), &t);
+ if (t == 0) {
+ pr_debug("discovered buffer done for buf %d\n", buf_id);
+ /* had_process_buffer_done(intelhaddata); */
+ }
+ t = intelhaddata->buf_info[buf_id].buf_size - t;
+
+ if (intelhaddata->stream_info.buffer_rendered)
+ div_u64_rem(intelhaddata->stream_info.buffer_rendered,
+ intelhaddata->stream_info.ring_buf_size,
+ &(bytes_rendered));
+
+ intelhaddata->stream_info.buffer_ptr = bytes_to_frames(
+ substream->runtime,
+ bytes_rendered + t);
+ return intelhaddata->stream_info.buffer_ptr;
+}
+
+/**
+ * snd_intelhad_pcm_mmap- mmaps a kernel buffer to user space for copying data
+ *
+ * @substream: substream for which the function is called
+ * @vma: struct instance of memory VMM memory area
+ *
+ * This function is called by OS when a user space component
+ * tries to get mmap memory from driver
+ */
+static int snd_intelhad_pcm_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *vma)
+{
+
+ pr_debug("snd_intelhad_pcm_mmap called\n");
+
+ pr_debug("entry with prot:%s\n", __func__);
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ return remap_pfn_range(vma, vma->vm_start,
+ substream->dma_buffer.addr >> PAGE_SHIFT,
+ vma->vm_end - vma->vm_start, vma->vm_page_prot);
+}
+
+int hdmi_audio_mode_change(struct snd_pcm_substream *substream)
+{
+ int retval = 0;
+ u32 disp_samp_freq, n_param;
+ struct snd_intelhad *intelhaddata;
+
+ intelhaddata = snd_pcm_substream_chip(substream);
+
+ /* Disable Audio */
+ intelhaddata->ops->enable_audio(substream, 0);
+
+ /* Update CTS value */
+ retval = had_get_caps(HAD_GET_DISPLAY_RATE, &disp_samp_freq);
+ if (retval) {
+ pr_err("querying display sampling freq failed %#x\n", retval);
+ goto out;
+ }
+
+ retval = intelhaddata->ops->prog_n(substream->runtime->rate, &n_param,
+ intelhaddata);
+ if (retval) {
+ pr_err("programming N value failed %#x\n", retval);
+ goto out;
+ }
+ intelhaddata->ops->prog_cts(substream->runtime->rate,
+ disp_samp_freq, n_param, intelhaddata);
+
+ /* Enable Audio */
+ intelhaddata->ops->enable_audio(substream, 1);
+
+out:
+ return retval;
+}
+
+/*PCM operations structure and the calls back for the same */
+struct snd_pcm_ops snd_intelhad_playback_ops = {
+ .open = snd_intelhad_open,
+ .close = snd_intelhad_close,
+ .ioctl = snd_pcm_lib_ioctl,
+ .hw_params = snd_intelhad_hw_params,
+ .hw_free = snd_intelhad_hw_free,
+ .prepare = snd_intelhad_pcm_prepare,
+ .trigger = snd_intelhad_pcm_trigger,
+ .pointer = snd_intelhad_pcm_pointer,
+ .mmap = snd_intelhad_pcm_mmap,
+};
+
+/**
+ * snd_intelhad_create - to crete alsa card instance
+ *
+ * @intelhaddata: pointer to internal context
+ * @card: pointer to card
+ *
+ * This function is called when the hdmi cable is plugged in
+ */
+static int snd_intelhad_create(
+ struct snd_intelhad *intelhaddata,
+ struct snd_card *card)
+{
+ int retval;
+ static struct snd_device_ops ops = {
+ };
+
+ pr_debug("snd_intelhad_create called\n");
+
+ if (!intelhaddata)
+ return -EINVAL;
+
+ /* ALSA api to register the device */
+ retval = snd_device_new(card, SNDRV_DEV_LOWLEVEL, intelhaddata, &ops);
+ return retval;
+}
+/**
+ * snd_intelhad_pcm_free - to free the memory allocated
+ *
+ * @pcm: pointer to pcm instance
+ * This function is called when the device is removed
+ */
+static void snd_intelhad_pcm_free(struct snd_pcm *pcm)
+{
+ pr_debug("Freeing PCM preallocated pages\n");
+ snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static int had_iec958_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
+ uinfo->count = 1;
+ return 0;
+}
+
+static int had_iec958_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol);
+
+ ucontrol->value.iec958.status[0] = (intelhaddata->aes_bits >> 0) & 0xff;
+ ucontrol->value.iec958.status[1] = (intelhaddata->aes_bits >> 8) & 0xff;
+ ucontrol->value.iec958.status[2] =
+ (intelhaddata->aes_bits >> 16) & 0xff;
+ ucontrol->value.iec958.status[3] =
+ (intelhaddata->aes_bits >> 24) & 0xff;
+ return 0;
+}
+static int had_iec958_mask_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ ucontrol->value.iec958.status[0] = 0xff;
+ ucontrol->value.iec958.status[1] = 0xff;
+ ucontrol->value.iec958.status[2] = 0xff;
+ ucontrol->value.iec958.status[3] = 0xff;
+ return 0;
+}
+static int had_iec958_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ unsigned int val;
+ struct snd_intelhad *intelhaddata = snd_kcontrol_chip(kcontrol);
+
+ pr_debug("entered had_iec958_put\n");
+ val = (ucontrol->value.iec958.status[0] << 0) |
+ (ucontrol->value.iec958.status[1] << 8) |
+ (ucontrol->value.iec958.status[2] << 16) |
+ (ucontrol->value.iec958.status[3] << 24);
+ if (intelhaddata->aes_bits != val) {
+ intelhaddata->aes_bits = val;
+ return 1;
+ }
+ return 1;
+}
+
+static struct snd_kcontrol_new had_control_iec958_mask = {
+ .access = SNDRV_CTL_ELEM_ACCESS_READ,
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
+ .info = had_iec958_info, /* shared */
+ .get = had_iec958_mask_get,
+};
+
+static struct snd_kcontrol_new had_control_iec958 = {
+ .iface = SNDRV_CTL_ELEM_IFACE_PCM,
+ .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
+ .info = had_iec958_info,
+ .get = had_iec958_get,
+ .put = had_iec958_put
+};
+
+static struct snd_intel_had_interface had_interface = {
+ .name = "hdmi-audio",
+ .query = hdmi_audio_query,
+ .suspend = hdmi_audio_suspend,
+ .resume = hdmi_audio_resume,
+};
+
+static struct had_ops had_ops_v1 = {
+ .enable_audio = snd_intelhad_enable_audio_v1,
+ .reset_audio = snd_intelhad_reset_audio_v1,
+ .prog_n = snd_intelhad_prog_n_v1,
+ .prog_cts = snd_intelhad_prog_cts_v1,
+ .audio_ctrl = snd_intelhad_prog_audio_ctrl_v1,
+ .prog_dip = snd_intelhad_prog_dip_v1,
+ .handle_underrun = had_clear_underrun_intr_v1,
+};
+
+static struct had_ops had_ops_v2 = {
+ .enable_audio = snd_intelhad_enable_audio_v2,
+ .reset_audio = snd_intelhad_reset_audio_v2,
+ .prog_n = snd_intelhad_prog_n_v2,
+ .prog_cts = snd_intelhad_prog_cts_v2,
+ .audio_ctrl = snd_intelhad_prog_audio_ctrl_v2,
+ .prog_dip = snd_intelhad_prog_dip_v2,
+ .handle_underrun = had_clear_underrun_intr_v2,
+};
+/**
+ * hdmi_audio_probe - to create sound card instance for HDMI audio playabck
+ *
+ *@haddata: pointer to HAD private data
+ *@card_id: card for which probe is called
+ *
+ * This function is called when the hdmi cable is plugged in. This function
+ * creates and registers the sound card with ALSA
+ */
+int hdmi_audio_probe(void *deviceptr)
+{
+ int retval;
+ struct snd_pcm *pcm;
+ struct snd_card *card;
+ struct had_callback_ops ops_cb;
+ struct snd_intelhad *intelhaddata;
+ struct had_pvt_data *had_stream;
+ struct platform_device *devptr = deviceptr;
+
+ pr_debug("Enter %s\n", __func__);
+
+ pr_debug("hdmi_audio_probe dma_mask: %p\n", devptr->dev.dma_mask);
+
+ /* allocate memory for saving internal context and working */
+ intelhaddata = kzalloc(sizeof(*intelhaddata), GFP_KERNEL);
+ if (!intelhaddata)
+ return -ENOMEM;
+
+ had_stream = kzalloc(sizeof(*had_stream), GFP_KERNEL);
+ if (!had_stream) {
+ retval = -ENOMEM;
+ goto free_haddata;
+ }
+
+ had_data = intelhaddata;
+ ops_cb.intel_had_event_call_back = had_event_handler;
+
+ /* registering with display driver to get access to display APIs */
+
+ retval = mid_hdmi_audio_setup(
+ ops_cb.intel_had_event_call_back,
+ &(intelhaddata->reg_ops),
+ &(intelhaddata->query_ops));
+ if (retval) {
+ pr_err("querying display driver APIs failed %#x\n", retval);
+ goto free_hadstream;
+ }
+ mutex_lock(&had_mutex);
+ spin_lock_init(&intelhaddata->had_spinlock);
+ intelhaddata->drv_status = HAD_DRV_DISCONNECTED;
+ pr_debug("%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_DISCONNECTED\n",
+ __func__, __LINE__);
+
+ /* create a card instance with ALSA framework */
+ retval = snd_card_new(&devptr->dev, hdmi_card_index, hdmi_card_id,
+ THIS_MODULE, 0, &card);
+
+ if (retval)
+ goto unlock_mutex;
+ intelhaddata->card = card;
+ intelhaddata->card_id = hdmi_card_id;
+ intelhaddata->card_index = card->number;
+ intelhaddata->private_data = had_stream;
+ intelhaddata->flag_underrun = 0;
+ intelhaddata->aes_bits = SNDRV_PCM_DEFAULT_CON_SPDIF;
+ strncpy(card->driver, INTEL_HAD, strlen(INTEL_HAD));
+ strncpy(card->shortname, INTEL_HAD, strlen(INTEL_HAD));
+
+ retval = snd_pcm_new(card, INTEL_HAD, PCM_INDEX, MAX_PB_STREAMS,
+ MAX_CAP_STREAMS, &pcm);
+ if (retval)
+ goto err;
+
+ /* setup private data which can be retrieved when required */
+ pcm->private_data = intelhaddata;
+ pcm->private_free = snd_intelhad_pcm_free;
+ pcm->info_flags = 0;
+ strncpy(pcm->name, card->shortname, strlen(card->shortname));
+ /* setup the ops for palyabck */
+ snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+ &snd_intelhad_playback_ops);
+ /* allocate dma pages for ALSA stream operations
+ * memory allocated is based on size, not max value
+ * thus using same argument for max & size
+ */
+ retval = snd_pcm_lib_preallocate_pages_for_all(pcm,
+ SNDRV_DMA_TYPE_DEV, NULL,
+ HAD_MAX_BUFFER, HAD_MAX_BUFFER);
+
+ if (card->dev == NULL)
+ pr_debug("card->dev is NULL!!!!! Should not be this case\n");
+ else if (card->dev->dma_mask == NULL)
+ pr_debug("hdmi_audio_probe dma_mask is NULL!!!!!\n");
+ else
+ pr_debug("hdmi_audio_probe dma_mask is : %p\n",
+ card->dev->dma_mask);
+
+ if (retval)
+ goto err;
+
+ /* internal function call to register device with ALSA */
+ retval = snd_intelhad_create(intelhaddata, card);
+ if (retval)
+ goto err;
+
+ card->private_data = &intelhaddata;
+ retval = snd_card_register(card);
+ if (retval)
+ goto err;
+
+ /* IEC958 controls */
+ retval = snd_ctl_add(card, snd_ctl_new1(&had_control_iec958_mask,
+ intelhaddata));
+ if (retval < 0)
+ goto err;
+ retval = snd_ctl_add(card, snd_ctl_new1(&had_control_iec958,
+ intelhaddata));
+ if (retval < 0)
+ goto err;
+
+ init_channel_allocations();
+
+ /* Register channel map controls */
+ retval = had_register_chmap_ctls(intelhaddata, pcm);
+ if (retval < 0)
+ goto err;
+
+ intelhaddata->dev = &devptr->dev;
+ pm_runtime_set_active(intelhaddata->dev);
+ pm_runtime_enable(intelhaddata->dev);
+
+ mutex_unlock(&had_mutex);
+ retval = mid_hdmi_audio_register(&had_interface, intelhaddata);
+ if (retval) {
+ pr_err("registering with display driver failed %#x\n", retval);
+ snd_card_free(card);
+ goto free_hadstream;
+ }
+
+ intelhaddata->hw_silence = 1;
+ had_ops_v1 = had_ops_v1; /* unused */
+ intelhaddata->ops = &had_ops_v2;
+
+ return retval;
+err:
+ snd_card_free(card);
+unlock_mutex:
+ mutex_unlock(&had_mutex);
+free_hadstream:
+ kfree(had_stream);
+ pm_runtime_disable(intelhaddata->dev);
+ intelhaddata->dev = NULL;
+free_haddata:
+ kfree(intelhaddata);
+ intelhaddata = NULL;
+ pr_err("Error returned from %s api %#x\n", __func__, retval);
+ return retval;
+}
+
+/**
+ * hdmi_audio_remove - removes the alsa card
+ *
+ *@haddata: pointer to HAD private data
+ *
+ * This function is called when the hdmi cable is un-plugged. This function
+ * free the sound card.
+ */
+int hdmi_audio_remove(void *pdevptr)
+{
+ struct snd_intelhad *intelhaddata = had_data;
+ int caps;
+
+ pr_debug("Enter %s\n", __func__);
+
+ if (!intelhaddata)
+ return 0;
+
+ if (intelhaddata->drv_status != HAD_DRV_DISCONNECTED) {
+ caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+ had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+ had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+ }
+ snd_card_free(intelhaddata->card);
+ kfree(intelhaddata->private_data);
+ kfree(intelhaddata);
+ return 0;
+}
+
+MODULE_AUTHOR("Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>");
+MODULE_AUTHOR("Ramesh Babu K V <ramesh.babu@intel.com>");
+MODULE_AUTHOR("Vaibhav Agarwal <vaibhav.agarwal@intel.com>");
+MODULE_AUTHOR("Jerome Anand <jerome.anand@intel.com>");
+MODULE_DESCRIPTION("Intel HDMI Audio driver");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("{Intel,Intel_HAD}");
--- /dev/null
+/*
+ * intel_hdmi_audio_if.c - Intel HDMI audio driver for MID
+ *
+ * Copyright (C) 2016 Intel Corp
+ * Authors: Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>
+ * Ramesh Babu K V <ramesh.babu@intel.com>
+ * Vaibhav Agarwal <vaibhav.agarwal@intel.com>
+ * Jerome Anand <jerome.anand@intel.com>
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * ALSA driver for Intel MID HDMI audio controller. This file contains
+ * interface functions exposed to HDMI Display driver and code to register
+ * with ALSA framework..
+ */
+
+#define pr_fmt(fmt) "had: " fmt
+
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/slab.h>
+#include <sound/pcm.h>
+#include <sound/core.h>
+#include "intel_hdmi_audio.h"
+#include "intel_hdmi_lpe_audio.h"
+
+/**
+ * hdmi_audio_query - hdmi audio query function
+ *
+ *@haddata: pointer to HAD private data
+ *@event: audio event for which this method is invoked
+ *
+ * This function is called by client driver to query the
+ * hdmi audio.
+ */
+int hdmi_audio_query(void *haddata, struct hdmi_audio_event event)
+{
+ struct snd_pcm_substream *substream = NULL;
+ struct had_pvt_data *had_stream;
+ unsigned long flag_irqs;
+ struct snd_intelhad *intelhaddata = (struct snd_intelhad *)haddata;
+
+ if (intelhaddata->stream_info.had_substream)
+ substream = intelhaddata->stream_info.had_substream;
+ had_stream = intelhaddata->private_data;
+ switch (event.type) {
+ case HAD_EVENT_QUERY_IS_AUDIO_BUSY:
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+
+ if ((had_stream->stream_type == HAD_RUNNING_STREAM) ||
+ substream) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock,
+ flag_irqs);
+ pr_debug("Audio stream active\n");
+ return -EBUSY;
+ }
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ break;
+
+ case HAD_EVENT_QUERY_IS_AUDIO_SUSPENDED:
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ if (intelhaddata->drv_status == HAD_DRV_SUSPENDED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock,
+ flag_irqs);
+ pr_debug("Audio is suspended\n");
+ return 1;
+ }
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ break;
+
+ default:
+ pr_debug("error un-handled event !!\n");
+ return -EINVAL;
+ break;
+
+ }
+
+ return 0;
+}
+
+/**
+ * hdmi_audio_suspend - power management suspend function
+ *
+ *@haddata: pointer to HAD private data
+ *@event: pm event for which this method is invoked
+ *
+ * This function is called by client driver to suspend the
+ * hdmi audio.
+ */
+int hdmi_audio_suspend(void *haddata, struct hdmi_audio_event event)
+{
+ int caps, retval = 0;
+ struct had_pvt_data *had_stream;
+ unsigned long flag_irqs;
+ struct snd_pcm_substream *substream;
+ struct snd_intelhad *intelhaddata = (struct snd_intelhad *)haddata;
+
+ pr_debug("Enter:%s\n", __func__);
+
+ had_stream = intelhaddata->private_data;
+ substream = intelhaddata->stream_info.had_substream;
+
+ if (intelhaddata->dev->power.runtime_status != RPM_SUSPENDED) {
+ pr_err("audio stream is active\n");
+ return -EAGAIN;
+ }
+
+
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_debug("had not connected\n");
+ return retval;
+ }
+
+ if (intelhaddata->drv_status == HAD_DRV_SUSPENDED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_debug("had already suspended\n");
+ return retval;
+ }
+
+ intelhaddata->drv_status = HAD_DRV_SUSPENDED;
+ pr_debug("%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_SUSPENDED\n",
+ __func__, __LINE__);
+
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ /*
+ * ToDo: Need to disable UNDERRUN interrupts as well
+ * caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+ */
+ caps = HDMI_AUDIO_BUFFER_DONE;
+ had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+ had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+ pr_debug("Exit:%s", __func__);
+ return retval;
+}
+
+/**
+ * hdmi_audio_resume - power management resume function
+ *
+ *@haddata: pointer to HAD private data
+ *
+ * This function is called by client driver to resume the
+ * hdmi audio.
+ */
+int hdmi_audio_resume(void *haddata)
+{
+ int caps, retval = 0;
+ struct snd_intelhad *intelhaddata = (struct snd_intelhad *)haddata;
+ unsigned long flag_irqs;
+
+ pr_debug("Enter:%s\n", __func__);
+
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_debug("had not connected\n");
+ return 0;
+ }
+
+ if (intelhaddata->drv_status != HAD_DRV_SUSPENDED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_err("had is not in suspended state\n");
+ return 0;
+ }
+
+ if (had_get_hwstate(intelhaddata)) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_err("Failed to resume. Device not accessible\n");
+ return -ENODEV;
+ }
+
+ intelhaddata->drv_status = HAD_DRV_CONNECTED;
+ pr_debug("%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_DISCONNECTED\n",
+ __func__, __LINE__);
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ /*
+ * ToDo: Need to enable UNDERRUN interrupts as well
+ * caps = HDMI_AUDIO_UNDERRUN | HDMI_AUDIO_BUFFER_DONE;
+ */
+ caps = HDMI_AUDIO_BUFFER_DONE;
+ retval = had_set_caps(HAD_SET_ENABLE_AUDIO_INT, &caps);
+ retval = had_set_caps(HAD_SET_ENABLE_AUDIO, NULL);
+ pr_debug("Exit:%s", __func__);
+ return retval;
+}
+
+static inline int had_chk_intrmiss(struct snd_intelhad *intelhaddata,
+ enum intel_had_aud_buf_type buf_id)
+{
+ int i, intr_count = 0;
+ enum intel_had_aud_buf_type buff_done;
+ u32 buf_size, buf_addr;
+ struct had_pvt_data *had_stream;
+ unsigned long flag_irqs;
+
+ had_stream = intelhaddata->private_data;
+
+ buff_done = buf_id;
+
+ intr_count = snd_intelhad_read_len(intelhaddata);
+ if (intr_count > 1) {
+ /* In case of active playback */
+ pr_err("Driver detected %d missed buffer done interrupt(s)!!!!\n",
+ (intr_count - 1));
+ if (intr_count > 3)
+ return intr_count;
+
+ buf_id += (intr_count - 1);
+ /* Reprogram registers*/
+ for (i = buff_done; i < buf_id; i++) {
+ int j = i % 4;
+
+ buf_size = intelhaddata->buf_info[j].buf_size;
+ buf_addr = intelhaddata->buf_info[j].buf_addr;
+ had_write_register(AUD_BUF_A_LENGTH +
+ (j * HAD_REG_WIDTH), buf_size);
+ had_write_register(
+ AUD_BUF_A_ADDR+(j * HAD_REG_WIDTH),
+ (buf_addr | BIT(0) | BIT(1)));
+ }
+ buf_id = buf_id % 4;
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ intelhaddata->buff_done = buf_id;
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ }
+
+ return intr_count;
+}
+
+int had_process_buffer_done(struct snd_intelhad *intelhaddata)
+{
+ int retval = 0;
+ u32 len = 1;
+ enum intel_had_aud_buf_type buf_id;
+ enum intel_had_aud_buf_type buff_done;
+ struct pcm_stream_info *stream;
+ u32 buf_size;
+ struct had_pvt_data *had_stream;
+ int intr_count;
+ enum had_status_stream stream_type;
+ unsigned long flag_irqs;
+
+ had_stream = intelhaddata->private_data;
+ stream = &intelhaddata->stream_info;
+ intr_count = 1;
+
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_err("%s:Device already disconnected\n", __func__);
+ return retval;
+ }
+ buf_id = intelhaddata->curr_buf;
+ intelhaddata->buff_done = buf_id;
+ buff_done = intelhaddata->buff_done;
+ buf_size = intelhaddata->buf_info[buf_id].buf_size;
+ stream_type = had_stream->stream_type;
+
+ pr_debug("Enter:%s buf_id=%d\n", __func__, buf_id);
+
+ /* Every debug statement has an implication
+ * of ~5msec. Thus, avoid having >3 debug statements
+ * for each buffer_done handling.
+ */
+
+ /* Check for any intr_miss in case of active playback */
+ if (had_stream->stream_type == HAD_RUNNING_STREAM) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ intr_count = had_chk_intrmiss(intelhaddata, buf_id);
+ if (!intr_count || (intr_count > 3)) {
+ pr_err("HAD SW state in non-recoverable!!! mode\n");
+ pr_err("Already played stale data\n");
+ return retval;
+ }
+ buf_id += (intr_count - 1);
+ buf_id = buf_id % 4;
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ }
+
+ intelhaddata->buf_info[buf_id].is_valid = true;
+ if (intelhaddata->valid_buf_cnt-1 == buf_id) {
+ if (had_stream->stream_type >= HAD_RUNNING_STREAM)
+ intelhaddata->curr_buf = HAD_BUF_TYPE_A;
+ } else
+ intelhaddata->curr_buf = buf_id + 1;
+
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+
+ if (had_get_hwstate(intelhaddata)) {
+ pr_err("HDMI cable plugged-out\n");
+ return retval;
+ }
+
+ /*Reprogram the registers with addr and length*/
+ had_write_register(AUD_BUF_A_LENGTH +
+ (buf_id * HAD_REG_WIDTH), buf_size);
+ had_write_register(AUD_BUF_A_ADDR+(buf_id * HAD_REG_WIDTH),
+ intelhaddata->buf_info[buf_id].buf_addr|
+ BIT(0) | BIT(1));
+
+ had_read_register(AUD_BUF_A_LENGTH + (buf_id * HAD_REG_WIDTH),
+ &len);
+ pr_debug("%s:Enabled buf[%d]\n", __func__, buf_id);
+
+ /* In case of actual data,
+ * report buffer_done to above ALSA layer
+ */
+ buf_size = intelhaddata->buf_info[buf_id].buf_size;
+ if (stream_type >= HAD_RUNNING_STREAM) {
+ intelhaddata->stream_info.buffer_rendered +=
+ (intr_count * buf_size);
+ stream->period_elapsed(stream->had_substream);
+ }
+
+ return retval;
+}
+
+int had_process_buffer_underrun(struct snd_intelhad *intelhaddata)
+{
+ int retval = 0;
+ enum intel_had_aud_buf_type buf_id;
+ struct pcm_stream_info *stream;
+ struct had_pvt_data *had_stream;
+ enum had_status_stream stream_type;
+ unsigned long flag_irqs;
+ int drv_status;
+
+ had_stream = intelhaddata->private_data;
+ stream = &intelhaddata->stream_info;
+
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ buf_id = intelhaddata->curr_buf;
+ stream_type = had_stream->stream_type;
+ intelhaddata->buff_done = buf_id;
+ drv_status = intelhaddata->drv_status;
+ if (stream_type == HAD_RUNNING_STREAM)
+ intelhaddata->curr_buf = HAD_BUF_TYPE_A;
+
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+
+ pr_debug("Enter:%s buf_id=%d, stream_type=%d\n",
+ __func__, buf_id, stream_type);
+
+ intelhaddata->ops->handle_underrun(intelhaddata);
+
+ if (drv_status == HAD_DRV_DISCONNECTED) {
+ pr_err("%s:Device already disconnected\n", __func__);
+ return retval;
+ }
+
+ if (stream_type == HAD_RUNNING_STREAM) {
+ /* Report UNDERRUN error to above layers */
+ intelhaddata->flag_underrun = 1;
+ stream->period_elapsed(stream->had_substream);
+ }
+
+ return retval;
+}
+
+int had_process_hot_plug(struct snd_intelhad *intelhaddata)
+{
+ int retval = 0;
+ enum intel_had_aud_buf_type buf_id;
+ struct snd_pcm_substream *substream;
+ struct had_pvt_data *had_stream;
+ unsigned long flag_irqs;
+
+ pr_debug("Enter:%s\n", __func__);
+
+ substream = intelhaddata->stream_info.had_substream;
+ had_stream = intelhaddata->private_data;
+
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ if (intelhaddata->drv_status == HAD_DRV_CONNECTED) {
+ pr_debug("Device already connected\n");
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ return retval;
+ }
+ buf_id = intelhaddata->curr_buf;
+ intelhaddata->buff_done = buf_id;
+ intelhaddata->drv_status = HAD_DRV_CONNECTED;
+ pr_debug("%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_CONNECTED\n",
+ __func__, __LINE__);
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+
+ pr_debug("Processing HOT_PLUG, buf_id = %d\n", buf_id);
+
+ /* Query display driver for audio register base */
+ if (intelhaddata->reg_ops.hdmi_audio_get_register_base(
+ &intelhaddata->audio_reg_base,
+ &intelhaddata->audio_cfg_offset)) {
+ pr_err("Unable to get audio reg base from Display driver\n");
+ goto err;
+ }
+
+ if (intelhaddata->audio_reg_base == NULL) {
+ pr_err("audio reg base value is NULL\n");
+ goto err;
+ }
+
+ pr_debug("%s audio_reg_base = 0x%p\n", __func__,
+ intelhaddata->audio_reg_base);
+
+ /* Safety check */
+ if (substream) {
+ pr_debug("There should not be active PB from ALSA\n");
+ pr_debug("Signifies, cable is plugged-in even before\n");
+ pr_debug("processing snd_pcm_disconnect\n");
+ /* Set runtime->state to hw_params done */
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
+ }
+
+ had_build_channel_allocation_map(intelhaddata);
+
+ return retval;
+
+err:
+ pm_runtime_disable(intelhaddata->dev);
+ intelhaddata->dev = NULL;
+ return retval;
+}
+
+int had_process_hot_unplug(struct snd_intelhad *intelhaddata)
+{
+ int caps, retval = 0;
+ enum intel_had_aud_buf_type buf_id;
+ struct had_pvt_data *had_stream;
+ unsigned long flag_irqs;
+
+ pr_debug("Enter:%s\n", __func__);
+
+ had_stream = intelhaddata->private_data;
+ buf_id = intelhaddata->curr_buf;
+
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+
+ if (intelhaddata->drv_status == HAD_DRV_DISCONNECTED) {
+ pr_debug("Device already disconnected\n");
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ return retval;
+
+ } else {
+ /* Disable Audio */
+ caps = HDMI_AUDIO_BUFFER_DONE;
+ retval = had_set_caps(HAD_SET_DISABLE_AUDIO_INT, &caps);
+ retval = had_set_caps(HAD_SET_DISABLE_AUDIO, NULL);
+ intelhaddata->ops->enable_audio(
+ intelhaddata->stream_info.had_substream, 0);
+ }
+
+ intelhaddata->drv_status = HAD_DRV_DISCONNECTED;
+ pr_debug("%s @ %d:DEBUG PLUG/UNPLUG : HAD_DRV_DISCONNECTED\n",
+ __func__, __LINE__);
+
+ /* Report to above ALSA layer */
+ if (intelhaddata->stream_info.had_substream != NULL) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ pr_debug("%s: unlock -> sending pcm_stop -> lock\n", __func__);
+ snd_pcm_stop(intelhaddata->stream_info.had_substream,
+ SNDRV_PCM_STATE_DISCONNECTED);
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ }
+
+ had_stream->stream_type = HAD_INIT;
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ kfree(intelhaddata->chmap->chmap);
+ intelhaddata->chmap->chmap = NULL;
+ intelhaddata->audio_reg_base = NULL;
+ pr_debug("%s: unlocked -> returned\n", __func__);
+
+ return retval;
+}
+
+/**
+ * had_event_handler - Call back function to handle events
+ *
+ * @event_type: Event type to handle
+ * @data: data related to the event_type
+ *
+ * This function is invoked to handle HDMI events from client driver.
+ */
+int had_event_handler(enum had_event_type event_type, void *data)
+{
+ int retval = 0;
+ struct snd_intelhad *intelhaddata = data;
+ enum intel_had_aud_buf_type buf_id;
+ struct snd_pcm_substream *substream;
+ struct had_pvt_data *had_stream;
+ unsigned long flag_irqs;
+
+ buf_id = intelhaddata->curr_buf;
+ had_stream = intelhaddata->private_data;
+
+ /* Switching to a function can drop atomicity even in INTR context.
+ * Thus, a big lock is acquired to maintain atomicity.
+ * This can be optimized later.
+ * Currently, only buffer_done/_underrun executes in INTR context.
+ * Also, locking is implemented separately to avoid real contention
+ * of data(struct intelhaddata) between IRQ/SOFT_IRQ/PROCESS context.
+ */
+ substream = intelhaddata->stream_info.had_substream;
+ switch (event_type) {
+ case HAD_EVENT_AUDIO_BUFFER_DONE:
+ retval = had_process_buffer_done(intelhaddata);
+ break;
+
+ case HAD_EVENT_AUDIO_BUFFER_UNDERRUN:
+ retval = had_process_buffer_underrun(intelhaddata);
+ break;
+
+ case HAD_EVENT_HOT_PLUG:
+ retval = had_process_hot_plug(intelhaddata);
+ break;
+
+ case HAD_EVENT_HOT_UNPLUG:
+ retval = had_process_hot_unplug(intelhaddata);
+ break;
+
+ case HAD_EVENT_MODE_CHANGING:
+ pr_debug(" called _event_handler with _MODE_CHANGE event\n");
+ /* Process only if stream is active & cable Plugged-in */
+ spin_lock_irqsave(&intelhaddata->had_spinlock, flag_irqs);
+ if (intelhaddata->drv_status >= HAD_DRV_DISCONNECTED) {
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock,
+ flag_irqs);
+ break;
+ }
+ spin_unlock_irqrestore(&intelhaddata->had_spinlock, flag_irqs);
+ if ((had_stream->stream_type == HAD_RUNNING_STREAM)
+ && substream)
+ retval = hdmi_audio_mode_change(substream);
+ break;
+
+ default:
+ pr_debug("error un-handled event !!\n");
+ retval = -EINVAL;
+ break;
+
+ }
+ return retval;
+}
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff