+++ /dev/null
-/*
- * Freescale MXS LRADC driver
- *
- * Copyright (c) 2012 DENX Software Engineering, GmbH.
- * Marek Vasut <marex@denx.de>
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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.
- */
-
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/completion.h>
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/input.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/platform_device.h>
-#include <linux/slab.h>
-#include <linux/stmp_device.h>
-#include <linux/sysfs.h>
-
-#include <linux/iio/buffer.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/trigger.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/triggered_buffer.h>
-#include <linux/iio/sysfs.h>
-
-#define DRIVER_NAME "mxs-lradc"
-
-#define LRADC_MAX_DELAY_CHANS 4
-#define LRADC_MAX_MAPPED_CHANS 8
-#define LRADC_MAX_TOTAL_CHANS 16
-
-#define LRADC_DELAY_TIMER_HZ 2000
-
-/*
- * Make this runtime configurable if necessary. Currently, if the buffered mode
- * is enabled, the LRADC takes LRADC_DELAY_TIMER_LOOP samples of data before
- * triggering IRQ. The sampling happens every (LRADC_DELAY_TIMER_PER / 2000)
- * seconds. The result is that the samples arrive every 500mS.
- */
-#define LRADC_DELAY_TIMER_PER 200
-#define LRADC_DELAY_TIMER_LOOP 5
-
-/*
- * Once the pen touches the touchscreen, the touchscreen switches from
- * IRQ-driven mode to polling mode to prevent interrupt storm. The polling
- * is realized by worker thread, which is called every 20 or so milliseconds.
- * This gives the touchscreen enough fluency and does not strain the system
- * too much.
- */
-#define LRADC_TS_SAMPLE_DELAY_MS 5
-
-/*
- * The LRADC reads the following amount of samples from each touchscreen
- * channel and the driver then computes average of these.
- */
-#define LRADC_TS_SAMPLE_AMOUNT 4
-
-enum mxs_lradc_id {
- IMX23_LRADC,
- IMX28_LRADC,
-};
-
-static const char * const mx23_lradc_irq_names[] = {
- "mxs-lradc-touchscreen",
- "mxs-lradc-channel0",
- "mxs-lradc-channel1",
- "mxs-lradc-channel2",
- "mxs-lradc-channel3",
- "mxs-lradc-channel4",
- "mxs-lradc-channel5",
- "mxs-lradc-channel6",
- "mxs-lradc-channel7",
-};
-
-static const char * const mx28_lradc_irq_names[] = {
- "mxs-lradc-touchscreen",
- "mxs-lradc-thresh0",
- "mxs-lradc-thresh1",
- "mxs-lradc-channel0",
- "mxs-lradc-channel1",
- "mxs-lradc-channel2",
- "mxs-lradc-channel3",
- "mxs-lradc-channel4",
- "mxs-lradc-channel5",
- "mxs-lradc-channel6",
- "mxs-lradc-channel7",
- "mxs-lradc-button0",
- "mxs-lradc-button1",
-};
-
-struct mxs_lradc_of_config {
- const int irq_count;
- const char * const *irq_name;
- const u32 *vref_mv;
-};
-
-#define VREF_MV_BASE 1850
-
-static const u32 mx23_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
- VREF_MV_BASE, /* CH0 */
- VREF_MV_BASE, /* CH1 */
- VREF_MV_BASE, /* CH2 */
- VREF_MV_BASE, /* CH3 */
- VREF_MV_BASE, /* CH4 */
- VREF_MV_BASE, /* CH5 */
- VREF_MV_BASE * 2, /* CH6 VDDIO */
- VREF_MV_BASE * 4, /* CH7 VBATT */
- VREF_MV_BASE, /* CH8 Temp sense 0 */
- VREF_MV_BASE, /* CH9 Temp sense 1 */
- VREF_MV_BASE, /* CH10 */
- VREF_MV_BASE, /* CH11 */
- VREF_MV_BASE, /* CH12 USB_DP */
- VREF_MV_BASE, /* CH13 USB_DN */
- VREF_MV_BASE, /* CH14 VBG */
- VREF_MV_BASE * 4, /* CH15 VDD5V */
-};
-
-static const u32 mx28_vref_mv[LRADC_MAX_TOTAL_CHANS] = {
- VREF_MV_BASE, /* CH0 */
- VREF_MV_BASE, /* CH1 */
- VREF_MV_BASE, /* CH2 */
- VREF_MV_BASE, /* CH3 */
- VREF_MV_BASE, /* CH4 */
- VREF_MV_BASE, /* CH5 */
- VREF_MV_BASE, /* CH6 */
- VREF_MV_BASE * 4, /* CH7 VBATT */
- VREF_MV_BASE, /* CH8 Temp sense 0 */
- VREF_MV_BASE, /* CH9 Temp sense 1 */
- VREF_MV_BASE * 2, /* CH10 VDDIO */
- VREF_MV_BASE, /* CH11 VTH */
- VREF_MV_BASE * 2, /* CH12 VDDA */
- VREF_MV_BASE, /* CH13 VDDD */
- VREF_MV_BASE, /* CH14 VBG */
- VREF_MV_BASE * 4, /* CH15 VDD5V */
-};
-
-static const struct mxs_lradc_of_config mxs_lradc_of_config[] = {
- [IMX23_LRADC] = {
- .irq_count = ARRAY_SIZE(mx23_lradc_irq_names),
- .irq_name = mx23_lradc_irq_names,
- .vref_mv = mx23_vref_mv,
- },
- [IMX28_LRADC] = {
- .irq_count = ARRAY_SIZE(mx28_lradc_irq_names),
- .irq_name = mx28_lradc_irq_names,
- .vref_mv = mx28_vref_mv,
- },
-};
-
-enum mxs_lradc_ts {
- MXS_LRADC_TOUCHSCREEN_NONE = 0,
- MXS_LRADC_TOUCHSCREEN_4WIRE,
- MXS_LRADC_TOUCHSCREEN_5WIRE,
-};
-
-/*
- * Touchscreen handling
- */
-enum lradc_ts_plate {
- LRADC_TOUCH = 0,
- LRADC_SAMPLE_X,
- LRADC_SAMPLE_Y,
- LRADC_SAMPLE_PRESSURE,
- LRADC_SAMPLE_VALID,
-};
-
-enum mxs_lradc_divbytwo {
- MXS_LRADC_DIV_DISABLED = 0,
- MXS_LRADC_DIV_ENABLED,
-};
-
-struct mxs_lradc_scale {
- unsigned int integer;
- unsigned int nano;
-};
-
-struct mxs_lradc {
- struct device *dev;
- void __iomem *base;
- int irq[13];
-
- struct clk *clk;
-
- u32 *buffer;
- struct iio_trigger *trig;
-
- struct mutex lock;
-
- struct completion completion;
-
- const u32 *vref_mv;
- struct mxs_lradc_scale scale_avail[LRADC_MAX_TOTAL_CHANS][2];
- unsigned long is_divided;
-
- /*
- * When the touchscreen is enabled, we give it two private virtual
- * channels: #6 and #7. This means that only 6 virtual channels (instead
- * of 8) will be available for buffered capture.
- */
-#define TOUCHSCREEN_VCHANNEL1 7
-#define TOUCHSCREEN_VCHANNEL2 6
-#define BUFFER_VCHANS_LIMITED 0x3f
-#define BUFFER_VCHANS_ALL 0xff
- u8 buffer_vchans;
-
- /*
- * Furthermore, certain LRADC channels are shared between touchscreen
- * and/or touch-buttons and generic LRADC block. Therefore when using
- * either of these, these channels are not available for the regular
- * sampling. The shared channels are as follows:
- *
- * CH0 -- Touch button #0
- * CH1 -- Touch button #1
- * CH2 -- Touch screen XPUL
- * CH3 -- Touch screen YPLL
- * CH4 -- Touch screen XNUL
- * CH5 -- Touch screen YNLR
- * CH6 -- Touch screen WIPER (5-wire only)
- *
- * The bit fields below represents which parts of the LRADC block are
- * switched into special mode of operation. These channels can not
- * be sampled as regular LRADC channels. The driver will refuse any
- * attempt to sample these channels.
- */
-#define CHAN_MASK_TOUCHBUTTON (BIT(1) | BIT(0))
-#define CHAN_MASK_TOUCHSCREEN_4WIRE (0xf << 2)
-#define CHAN_MASK_TOUCHSCREEN_5WIRE (0x1f << 2)
- enum mxs_lradc_ts use_touchscreen;
- bool use_touchbutton;
-
- struct input_dev *ts_input;
-
- enum mxs_lradc_id soc;
- enum lradc_ts_plate cur_plate; /* state machine */
- bool ts_valid;
- unsigned ts_x_pos;
- unsigned ts_y_pos;
- unsigned ts_pressure;
-
- /* handle touchscreen's physical behaviour */
- /* samples per coordinate */
- unsigned over_sample_cnt;
- /* time clocks between samples */
- unsigned over_sample_delay;
- /* time in clocks to wait after the plates where switched */
- unsigned settling_delay;
-};
-
-#define LRADC_CTRL0 0x00
-# define LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE BIT(23)
-# define LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE BIT(22)
-# define LRADC_CTRL0_MX28_YNNSW /* YM */ BIT(21)
-# define LRADC_CTRL0_MX28_YPNSW /* YP */ BIT(20)
-# define LRADC_CTRL0_MX28_YPPSW /* YP */ BIT(19)
-# define LRADC_CTRL0_MX28_XNNSW /* XM */ BIT(18)
-# define LRADC_CTRL0_MX28_XNPSW /* XM */ BIT(17)
-# define LRADC_CTRL0_MX28_XPPSW /* XP */ BIT(16)
-
-# define LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE BIT(20)
-# define LRADC_CTRL0_MX23_YM BIT(19)
-# define LRADC_CTRL0_MX23_XM BIT(18)
-# define LRADC_CTRL0_MX23_YP BIT(17)
-# define LRADC_CTRL0_MX23_XP BIT(16)
-
-# define LRADC_CTRL0_MX28_PLATE_MASK \
- (LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE | \
- LRADC_CTRL0_MX28_YNNSW | LRADC_CTRL0_MX28_YPNSW | \
- LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW | \
- LRADC_CTRL0_MX28_XNPSW | LRADC_CTRL0_MX28_XPPSW)
-
-# define LRADC_CTRL0_MX23_PLATE_MASK \
- (LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE | \
- LRADC_CTRL0_MX23_YM | LRADC_CTRL0_MX23_XM | \
- LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XP)
-
-#define LRADC_CTRL1 0x10
-#define LRADC_CTRL1_TOUCH_DETECT_IRQ_EN BIT(24)
-#define LRADC_CTRL1_LRADC_IRQ_EN(n) (1 << ((n) + 16))
-#define LRADC_CTRL1_MX28_LRADC_IRQ_EN_MASK (0x1fff << 16)
-#define LRADC_CTRL1_MX23_LRADC_IRQ_EN_MASK (0x01ff << 16)
-#define LRADC_CTRL1_LRADC_IRQ_EN_OFFSET 16
-#define LRADC_CTRL1_TOUCH_DETECT_IRQ BIT(8)
-#define LRADC_CTRL1_LRADC_IRQ(n) (1 << (n))
-#define LRADC_CTRL1_MX28_LRADC_IRQ_MASK 0x1fff
-#define LRADC_CTRL1_MX23_LRADC_IRQ_MASK 0x01ff
-#define LRADC_CTRL1_LRADC_IRQ_OFFSET 0
-
-#define LRADC_CTRL2 0x20
-#define LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET 24
-#define LRADC_CTRL2_TEMPSENSE_PWD BIT(15)
-
-#define LRADC_STATUS 0x40
-#define LRADC_STATUS_TOUCH_DETECT_RAW BIT(0)
-
-#define LRADC_CH(n) (0x50 + (0x10 * (n)))
-#define LRADC_CH_ACCUMULATE BIT(29)
-#define LRADC_CH_NUM_SAMPLES_MASK (0x1f << 24)
-#define LRADC_CH_NUM_SAMPLES_OFFSET 24
-#define LRADC_CH_NUM_SAMPLES(x) \
- ((x) << LRADC_CH_NUM_SAMPLES_OFFSET)
-#define LRADC_CH_VALUE_MASK 0x3ffff
-#define LRADC_CH_VALUE_OFFSET 0
-
-#define LRADC_DELAY(n) (0xd0 + (0x10 * (n)))
-#define LRADC_DELAY_TRIGGER_LRADCS_MASK (0xffUL << 24)
-#define LRADC_DELAY_TRIGGER_LRADCS_OFFSET 24
-#define LRADC_DELAY_TRIGGER(x) \
- (((x) << LRADC_DELAY_TRIGGER_LRADCS_OFFSET) & \
- LRADC_DELAY_TRIGGER_LRADCS_MASK)
-#define LRADC_DELAY_KICK BIT(20)
-#define LRADC_DELAY_TRIGGER_DELAYS_MASK (0xf << 16)
-#define LRADC_DELAY_TRIGGER_DELAYS_OFFSET 16
-#define LRADC_DELAY_TRIGGER_DELAYS(x) \
- (((x) << LRADC_DELAY_TRIGGER_DELAYS_OFFSET) & \
- LRADC_DELAY_TRIGGER_DELAYS_MASK)
-#define LRADC_DELAY_LOOP_COUNT_MASK (0x1f << 11)
-#define LRADC_DELAY_LOOP_COUNT_OFFSET 11
-#define LRADC_DELAY_LOOP(x) \
- (((x) << LRADC_DELAY_LOOP_COUNT_OFFSET) & \
- LRADC_DELAY_LOOP_COUNT_MASK)
-#define LRADC_DELAY_DELAY_MASK 0x7ff
-#define LRADC_DELAY_DELAY_OFFSET 0
-#define LRADC_DELAY_DELAY(x) \
- (((x) << LRADC_DELAY_DELAY_OFFSET) & \
- LRADC_DELAY_DELAY_MASK)
-
-#define LRADC_CTRL4 0x140
-#define LRADC_CTRL4_LRADCSELECT_MASK(n) (0xf << ((n) * 4))
-#define LRADC_CTRL4_LRADCSELECT_OFFSET(n) ((n) * 4)
-#define LRADC_CTRL4_LRADCSELECT(n, x) \
- (((x) << LRADC_CTRL4_LRADCSELECT_OFFSET(n)) & \
- LRADC_CTRL4_LRADCSELECT_MASK(n))
-
-#define LRADC_RESOLUTION 12
-#define LRADC_SINGLE_SAMPLE_MASK ((1 << LRADC_RESOLUTION) - 1)
-
-static void mxs_lradc_reg_set(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
- writel(val, lradc->base + reg + STMP_OFFSET_REG_SET);
-}
-
-static void mxs_lradc_reg_clear(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
- writel(val, lradc->base + reg + STMP_OFFSET_REG_CLR);
-}
-
-static void mxs_lradc_reg_wrt(struct mxs_lradc *lradc, u32 val, u32 reg)
-{
- writel(val, lradc->base + reg);
-}
-
-static u32 mxs_lradc_plate_mask(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_PLATE_MASK;
- return LRADC_CTRL0_MX28_PLATE_MASK;
-}
-
-static u32 mxs_lradc_irq_mask(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL1_MX23_LRADC_IRQ_MASK;
- return LRADC_CTRL1_MX28_LRADC_IRQ_MASK;
-}
-
-static u32 mxs_lradc_touch_detect_bit(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_TOUCH_DETECT_ENABLE;
- return LRADC_CTRL0_MX28_TOUCH_DETECT_ENABLE;
-}
-
-static u32 mxs_lradc_drive_x_plate(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_XP | LRADC_CTRL0_MX23_XM;
- return LRADC_CTRL0_MX28_XPPSW | LRADC_CTRL0_MX28_XNNSW;
-}
-
-static u32 mxs_lradc_drive_y_plate(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_YM;
- return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_YNNSW;
-}
-
-static u32 mxs_lradc_drive_pressure(struct mxs_lradc *lradc)
-{
- if (lradc->soc == IMX23_LRADC)
- return LRADC_CTRL0_MX23_YP | LRADC_CTRL0_MX23_XM;
- return LRADC_CTRL0_MX28_YPPSW | LRADC_CTRL0_MX28_XNNSW;
-}
-
-static bool mxs_lradc_check_touch_event(struct mxs_lradc *lradc)
-{
- return !!(readl(lradc->base + LRADC_STATUS) &
- LRADC_STATUS_TOUCH_DETECT_RAW);
-}
-
-static void mxs_lradc_map_channel(struct mxs_lradc *lradc, unsigned vch,
- unsigned ch)
-{
- mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(vch),
- LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, LRADC_CTRL4_LRADCSELECT(vch, ch), LRADC_CTRL4);
-}
-
-static void mxs_lradc_setup_ts_channel(struct mxs_lradc *lradc, unsigned ch)
-{
- /*
- * prepare for oversampling conversion
- *
- * from the datasheet:
- * "The ACCUMULATE bit in the appropriate channel register
- * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
- * otherwise, the IRQs will not fire."
- */
- mxs_lradc_reg_wrt(lradc, LRADC_CH_ACCUMULATE |
- LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1),
- LRADC_CH(ch));
-
- /*
- * from the datasheet:
- * "Software must clear this register in preparation for a
- * multi-cycle accumulation.
- */
- mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch));
-
- /*
- * prepare the delay/loop unit according to the oversampling count
- *
- * from the datasheet:
- * "The DELAY fields in HW_LRADC_DELAY0, HW_LRADC_DELAY1,
- * HW_LRADC_DELAY2, and HW_LRADC_DELAY3 must be non-zero; otherwise,
- * the LRADC will not trigger the delay group."
- */
- mxs_lradc_reg_wrt(lradc, LRADC_DELAY_TRIGGER(1 << ch) |
- LRADC_DELAY_TRIGGER_DELAYS(0) |
- LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
- LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
- LRADC_DELAY(3));
-
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch), LRADC_CTRL1);
-
- /*
- * after changing the touchscreen plates setting
- * the signals need some initial time to settle. Start the
- * SoC's delay unit and start the conversion later
- * and automatically.
- */
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
- LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
- LRADC_DELAY_KICK |
- LRADC_DELAY_DELAY(lradc->settling_delay),
- LRADC_DELAY(2));
-}
-
-/*
- * Pressure detection is special:
- * We want to do both required measurements for the pressure detection in
- * one turn. Use the hardware features to chain both conversions and let the
- * hardware report one interrupt if both conversions are done
- */
-static void mxs_lradc_setup_ts_pressure(struct mxs_lradc *lradc, unsigned ch1,
- unsigned ch2)
-{
- u32 reg;
-
- /*
- * prepare for oversampling conversion
- *
- * from the datasheet:
- * "The ACCUMULATE bit in the appropriate channel register
- * HW_LRADC_CHn must be set to 1 if NUM_SAMPLES is greater then 0;
- * otherwise, the IRQs will not fire."
- */
- reg = LRADC_CH_ACCUMULATE |
- LRADC_CH_NUM_SAMPLES(lradc->over_sample_cnt - 1);
- mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch1));
- mxs_lradc_reg_wrt(lradc, reg, LRADC_CH(ch2));
-
- /*
- * from the datasheet:
- * "Software must clear this register in preparation for a
- * multi-cycle accumulation.
- */
- mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch1));
- mxs_lradc_reg_clear(lradc, LRADC_CH_VALUE_MASK, LRADC_CH(ch2));
-
- /* prepare the delay/loop unit according to the oversampling count */
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(1 << ch1) |
- LRADC_DELAY_TRIGGER(1 << ch2) | /* start both channels */
- LRADC_DELAY_TRIGGER_DELAYS(0) |
- LRADC_DELAY_LOOP(lradc->over_sample_cnt - 1) |
- LRADC_DELAY_DELAY(lradc->over_sample_delay - 1),
- LRADC_DELAY(3));
-
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ(ch2), LRADC_CTRL1);
-
- /*
- * after changing the touchscreen plates setting
- * the signals need some initial time to settle. Start the
- * SoC's delay unit and start the conversion later
- * and automatically.
- */
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(0) | /* don't trigger ADC */
- LRADC_DELAY_TRIGGER_DELAYS(BIT(3)) | /* trigger DELAY unit#3 */
- LRADC_DELAY_KICK |
- LRADC_DELAY_DELAY(lradc->settling_delay), LRADC_DELAY(2));
-}
-
-static unsigned mxs_lradc_read_raw_channel(struct mxs_lradc *lradc,
- unsigned channel)
-{
- u32 reg;
- unsigned num_samples, val;
-
- reg = readl(lradc->base + LRADC_CH(channel));
- if (reg & LRADC_CH_ACCUMULATE)
- num_samples = lradc->over_sample_cnt;
- else
- num_samples = 1;
-
- val = (reg & LRADC_CH_VALUE_MASK) >> LRADC_CH_VALUE_OFFSET;
- return val / num_samples;
-}
-
-static unsigned mxs_lradc_read_ts_pressure(struct mxs_lradc *lradc,
- unsigned ch1, unsigned ch2)
-{
- u32 reg, mask;
- unsigned pressure, m1, m2;
-
- mask = LRADC_CTRL1_LRADC_IRQ(ch1) | LRADC_CTRL1_LRADC_IRQ(ch2);
- reg = readl(lradc->base + LRADC_CTRL1) & mask;
-
- while (reg != mask) {
- reg = readl(lradc->base + LRADC_CTRL1) & mask;
- dev_dbg(lradc->dev, "One channel is still busy: %X\n", reg);
- }
-
- m1 = mxs_lradc_read_raw_channel(lradc, ch1);
- m2 = mxs_lradc_read_raw_channel(lradc, ch2);
-
- if (m2 == 0) {
- dev_warn(lradc->dev, "Cannot calculate pressure\n");
- return 1 << (LRADC_RESOLUTION - 1);
- }
-
- /* simply scale the value from 0 ... max ADC resolution */
- pressure = m1;
- pressure *= (1 << LRADC_RESOLUTION);
- pressure /= m2;
-
- dev_dbg(lradc->dev, "Pressure = %u\n", pressure);
- return pressure;
-}
-
-#define TS_CH_XP 2
-#define TS_CH_YP 3
-#define TS_CH_XM 4
-#define TS_CH_YM 5
-
-/*
- * YP(open)--+-------------+
- * | |--+
- * | | |
- * YM(-)--+-------------+ |
- * +--------------+
- * | |
- * XP(weak+) XM(open)
- *
- * "weak+" means 200k Ohm VDDIO
- * (-) means GND
- */
-static void mxs_lradc_setup_touch_detection(struct mxs_lradc *lradc)
-{
- /*
- * In order to detect a touch event the 'touch detect enable' bit
- * enables:
- * - a weak pullup to the X+ connector
- * - a strong ground at the Y- connector
- */
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_touch_detect_bit(lradc),
- LRADC_CTRL0);
-}
-
-/*
- * YP(meas)--+-------------+
- * | |--+
- * | | |
- * YM(open)--+-------------+ |
- * +--------------+
- * | |
- * XP(+) XM(-)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_x_pos(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_drive_x_plate(lradc), LRADC_CTRL0);
-
- lradc->cur_plate = LRADC_SAMPLE_X;
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YP);
- mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
-}
-
-/*
- * YP(+)--+-------------+
- * | |--+
- * | | |
- * YM(-)--+-------------+ |
- * +--------------+
- * | |
- * XP(open) XM(meas)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_y_pos(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_drive_y_plate(lradc), LRADC_CTRL0);
-
- lradc->cur_plate = LRADC_SAMPLE_Y;
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_XM);
- mxs_lradc_setup_ts_channel(lradc, TOUCHSCREEN_VCHANNEL1);
-}
-
-/*
- * YP(+)--+-------------+
- * | |--+
- * | | |
- * YM(meas)--+-------------+ |
- * +--------------+
- * | |
- * XP(meas) XM(-)
- *
- * (+) means here 1.85 V
- * (-) means here GND
- */
-static void mxs_lradc_prepare_pressure(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
- mxs_lradc_reg_set(lradc, mxs_lradc_drive_pressure(lradc), LRADC_CTRL0);
-
- lradc->cur_plate = LRADC_SAMPLE_PRESSURE;
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL1, TS_CH_YM);
- mxs_lradc_map_channel(lradc, TOUCHSCREEN_VCHANNEL2, TS_CH_XP);
- mxs_lradc_setup_ts_pressure(lradc, TOUCHSCREEN_VCHANNEL2,
- TOUCHSCREEN_VCHANNEL1);
-}
-
-static void mxs_lradc_enable_touch_detection(struct mxs_lradc *lradc)
-{
- /* Configure the touchscreen type */
- if (lradc->soc == IMX28_LRADC) {
- mxs_lradc_reg_clear(lradc, LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
- LRADC_CTRL0);
-
- if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
- mxs_lradc_reg_set(lradc,
- LRADC_CTRL0_MX28_TOUCH_SCREEN_TYPE,
- LRADC_CTRL0);
- }
-
- mxs_lradc_setup_touch_detection(lradc);
-
- lradc->cur_plate = LRADC_TOUCH;
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ |
- LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-}
-
-static void mxs_lradc_start_touch_event(struct mxs_lradc *lradc)
-{
- mxs_lradc_reg_clear(lradc,
- LRADC_CTRL1_TOUCH_DETECT_IRQ_EN,
- LRADC_CTRL1);
- mxs_lradc_reg_set(lradc,
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1),
- LRADC_CTRL1);
- /*
- * start with the Y-pos, because it uses nearly the same plate
- * settings like the touch detection
- */
- mxs_lradc_prepare_y_pos(lradc);
-}
-
-static void mxs_lradc_report_ts_event(struct mxs_lradc *lradc)
-{
- input_report_abs(lradc->ts_input, ABS_X, lradc->ts_x_pos);
- input_report_abs(lradc->ts_input, ABS_Y, lradc->ts_y_pos);
- input_report_abs(lradc->ts_input, ABS_PRESSURE, lradc->ts_pressure);
- input_report_key(lradc->ts_input, BTN_TOUCH, 1);
- input_sync(lradc->ts_input);
-}
-
-static void mxs_lradc_complete_touch_event(struct mxs_lradc *lradc)
-{
- mxs_lradc_setup_touch_detection(lradc);
- lradc->cur_plate = LRADC_SAMPLE_VALID;
- /*
- * start a dummy conversion to burn time to settle the signals
- * note: we are not interested in the conversion's value
- */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(TOUCHSCREEN_VCHANNEL1));
- mxs_lradc_reg_clear(lradc,
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2),
- LRADC_CTRL1);
- mxs_lradc_reg_wrt(
- lradc,
- LRADC_DELAY_TRIGGER(1 << TOUCHSCREEN_VCHANNEL1) |
- LRADC_DELAY_KICK | LRADC_DELAY_DELAY(10), /* waste 5 ms */
- LRADC_DELAY(2));
-}
-
-/*
- * in order to avoid false measurements, report only samples where
- * the surface is still touched after the position measurement
- */
-static void mxs_lradc_finish_touch_event(struct mxs_lradc *lradc, bool valid)
-{
- /* if it is still touched, report the sample */
- if (valid && mxs_lradc_check_touch_event(lradc)) {
- lradc->ts_valid = true;
- mxs_lradc_report_ts_event(lradc);
- }
-
- /* if it is even still touched, continue with the next measurement */
- if (mxs_lradc_check_touch_event(lradc)) {
- mxs_lradc_prepare_y_pos(lradc);
- return;
- }
-
- if (lradc->ts_valid) {
- /* signal the release */
- lradc->ts_valid = false;
- input_report_key(lradc->ts_input, BTN_TOUCH, 0);
- input_sync(lradc->ts_input);
- }
-
- /* if it is released, wait for the next touch via IRQ */
- lradc->cur_plate = LRADC_TOUCH;
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
- mxs_lradc_reg_clear(lradc,
- LRADC_CTRL1_TOUCH_DETECT_IRQ |
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1),
- LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN, LRADC_CTRL1);
-}
-
-/* touchscreen's state machine */
-static void mxs_lradc_handle_touch(struct mxs_lradc *lradc)
-{
- switch (lradc->cur_plate) {
- case LRADC_TOUCH:
- if (mxs_lradc_check_touch_event(lradc))
- mxs_lradc_start_touch_event(lradc);
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ,
- LRADC_CTRL1);
- return;
-
- case LRADC_SAMPLE_Y:
- lradc->ts_y_pos =
- mxs_lradc_read_raw_channel(lradc,
- TOUCHSCREEN_VCHANNEL1);
- mxs_lradc_prepare_x_pos(lradc);
- return;
-
- case LRADC_SAMPLE_X:
- lradc->ts_x_pos =
- mxs_lradc_read_raw_channel(lradc,
- TOUCHSCREEN_VCHANNEL1);
- mxs_lradc_prepare_pressure(lradc);
- return;
-
- case LRADC_SAMPLE_PRESSURE:
- lradc->ts_pressure =
- mxs_lradc_read_ts_pressure(lradc,
- TOUCHSCREEN_VCHANNEL2,
- TOUCHSCREEN_VCHANNEL1);
- mxs_lradc_complete_touch_event(lradc);
- return;
-
- case LRADC_SAMPLE_VALID:
- mxs_lradc_finish_touch_event(lradc, 1);
- break;
- }
-}
-
-/*
- * Raw I/O operations
- */
-static int mxs_lradc_read_single(struct iio_dev *iio_dev, int chan, int *val)
-{
- struct mxs_lradc *lradc = iio_priv(iio_dev);
- int ret;
-
- /*
- * See if there is no buffered operation in progress. If there is, simply
- * bail out. This can be improved to support both buffered and raw IO at
- * the same time, yet the code becomes horribly complicated. Therefore I
- * applied KISS principle here.
- */
- ret = mutex_trylock(&lradc->lock);
- if (!ret)
- return -EBUSY;
-
- reinit_completion(&lradc->completion);
-
- /*
- * No buffered operation in progress, map the channel and trigger it.
- * Virtual channel 0 is always used here as the others are always not
- * used if doing raw sampling.
- */
- if (lradc->soc == IMX28_LRADC)
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0),
- LRADC_CTRL1);
- mxs_lradc_reg_clear(lradc, 0x1, LRADC_CTRL0);
-
- /* Enable / disable the divider per requirement */
- if (test_bit(chan, &lradc->is_divided))
- mxs_lradc_reg_set(lradc,
- 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
- LRADC_CTRL2);
- else
- mxs_lradc_reg_clear(lradc,
- 1 << LRADC_CTRL2_DIVIDE_BY_TWO_OFFSET,
- LRADC_CTRL2);
-
- /* Clean the slot's previous content, then set new one. */
- mxs_lradc_reg_clear(lradc, LRADC_CTRL4_LRADCSELECT_MASK(0),
- LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, chan, LRADC_CTRL4);
-
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CH(0));
-
- /* Enable the IRQ and start sampling the channel. */
- mxs_lradc_reg_set(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, BIT(0), LRADC_CTRL0);
-
- /* Wait for completion on the channel, 1 second max. */
- ret = wait_for_completion_killable_timeout(&lradc->completion, HZ);
- if (!ret)
- ret = -ETIMEDOUT;
- if (ret < 0)
- goto err;
-
- /* Read the data. */
- *val = readl(lradc->base + LRADC_CH(0)) & LRADC_CH_VALUE_MASK;
- ret = IIO_VAL_INT;
-
-err:
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_LRADC_IRQ_EN(0), LRADC_CTRL1);
-
- mutex_unlock(&lradc->lock);
-
- return ret;
-}
-
-static int mxs_lradc_read_temp(struct iio_dev *iio_dev, int *val)
-{
- int ret, min, max;
-
- ret = mxs_lradc_read_single(iio_dev, 8, &min);
- if (ret != IIO_VAL_INT)
- return ret;
-
- ret = mxs_lradc_read_single(iio_dev, 9, &max);
- if (ret != IIO_VAL_INT)
- return ret;
-
- *val = max - min;
-
- return IIO_VAL_INT;
-}
-
-static int mxs_lradc_read_raw(struct iio_dev *iio_dev,
- const struct iio_chan_spec *chan,
- int *val, int *val2, long m)
-{
- struct mxs_lradc *lradc = iio_priv(iio_dev);
-
- switch (m) {
- case IIO_CHAN_INFO_RAW:
- if (chan->type == IIO_TEMP)
- return mxs_lradc_read_temp(iio_dev, val);
-
- return mxs_lradc_read_single(iio_dev, chan->channel, val);
-
- case IIO_CHAN_INFO_SCALE:
- if (chan->type == IIO_TEMP) {
- /*
- * From the datasheet, we have to multiply by 1.012 and
- * divide by 4
- */
- *val = 0;
- *val2 = 253000;
- return IIO_VAL_INT_PLUS_MICRO;
- }
-
- *val = lradc->vref_mv[chan->channel];
- *val2 = chan->scan_type.realbits -
- test_bit(chan->channel, &lradc->is_divided);
- return IIO_VAL_FRACTIONAL_LOG2;
-
- case IIO_CHAN_INFO_OFFSET:
- if (chan->type == IIO_TEMP) {
- /*
- * The calculated value from the ADC is in Kelvin, we
- * want Celsius for hwmon so the offset is -273.15
- * The offset is applied before scaling so it is
- * actually -213.15 * 4 / 1.012 = -1079.644268
- */
- *val = -1079;
- *val2 = 644268;
-
- return IIO_VAL_INT_PLUS_MICRO;
- }
-
- return -EINVAL;
-
- default:
- break;
- }
-
- return -EINVAL;
-}
-
-static int mxs_lradc_write_raw(struct iio_dev *iio_dev,
- const struct iio_chan_spec *chan,
- int val, int val2, long m)
-{
- struct mxs_lradc *lradc = iio_priv(iio_dev);
- struct mxs_lradc_scale *scale_avail =
- lradc->scale_avail[chan->channel];
- int ret;
-
- ret = mutex_trylock(&lradc->lock);
- if (!ret)
- return -EBUSY;
-
- switch (m) {
- case IIO_CHAN_INFO_SCALE:
- ret = -EINVAL;
- if (val == scale_avail[MXS_LRADC_DIV_DISABLED].integer &&
- val2 == scale_avail[MXS_LRADC_DIV_DISABLED].nano) {
- /* divider by two disabled */
- clear_bit(chan->channel, &lradc->is_divided);
- ret = 0;
- } else if (val == scale_avail[MXS_LRADC_DIV_ENABLED].integer &&
- val2 == scale_avail[MXS_LRADC_DIV_ENABLED].nano) {
- /* divider by two enabled */
- set_bit(chan->channel, &lradc->is_divided);
- ret = 0;
- }
-
- break;
- default:
- ret = -EINVAL;
- break;
- }
-
- mutex_unlock(&lradc->lock);
-
- return ret;
-}
-
-static int mxs_lradc_write_raw_get_fmt(struct iio_dev *iio_dev,
- const struct iio_chan_spec *chan,
- long m)
-{
- return IIO_VAL_INT_PLUS_NANO;
-}
-
-static ssize_t mxs_lradc_show_scale_available_ch(struct device *dev,
- struct device_attribute *attr,
- char *buf,
- int ch)
-{
- struct iio_dev *iio = dev_to_iio_dev(dev);
- struct mxs_lradc *lradc = iio_priv(iio);
- int i, len = 0;
-
- for (i = 0; i < ARRAY_SIZE(lradc->scale_avail[ch]); i++)
- len += sprintf(buf + len, "%u.%09u ",
- lradc->scale_avail[ch][i].integer,
- lradc->scale_avail[ch][i].nano);
-
- len += sprintf(buf + len, "\n");
-
- return len;
-}
-
-static ssize_t mxs_lradc_show_scale_available(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev_attr *iio_attr = to_iio_dev_attr(attr);
-
- return mxs_lradc_show_scale_available_ch(dev, attr, buf,
- iio_attr->address);
-}
-
-#define SHOW_SCALE_AVAILABLE_ATTR(ch) \
-static IIO_DEVICE_ATTR(in_voltage##ch##_scale_available, S_IRUGO, \
- mxs_lradc_show_scale_available, NULL, ch)
-
-SHOW_SCALE_AVAILABLE_ATTR(0);
-SHOW_SCALE_AVAILABLE_ATTR(1);
-SHOW_SCALE_AVAILABLE_ATTR(2);
-SHOW_SCALE_AVAILABLE_ATTR(3);
-SHOW_SCALE_AVAILABLE_ATTR(4);
-SHOW_SCALE_AVAILABLE_ATTR(5);
-SHOW_SCALE_AVAILABLE_ATTR(6);
-SHOW_SCALE_AVAILABLE_ATTR(7);
-SHOW_SCALE_AVAILABLE_ATTR(10);
-SHOW_SCALE_AVAILABLE_ATTR(11);
-SHOW_SCALE_AVAILABLE_ATTR(12);
-SHOW_SCALE_AVAILABLE_ATTR(13);
-SHOW_SCALE_AVAILABLE_ATTR(14);
-SHOW_SCALE_AVAILABLE_ATTR(15);
-
-static struct attribute *mxs_lradc_attributes[] = {
- &iio_dev_attr_in_voltage0_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage1_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage2_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage3_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage4_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage5_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage6_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage7_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage10_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage11_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage12_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage13_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage14_scale_available.dev_attr.attr,
- &iio_dev_attr_in_voltage15_scale_available.dev_attr.attr,
- NULL
-};
-
-static const struct attribute_group mxs_lradc_attribute_group = {
- .attrs = mxs_lradc_attributes,
-};
-
-static const struct iio_info mxs_lradc_iio_info = {
- .driver_module = THIS_MODULE,
- .read_raw = mxs_lradc_read_raw,
- .write_raw = mxs_lradc_write_raw,
- .write_raw_get_fmt = mxs_lradc_write_raw_get_fmt,
- .attrs = &mxs_lradc_attribute_group,
-};
-
-static int mxs_lradc_ts_open(struct input_dev *dev)
-{
- struct mxs_lradc *lradc = input_get_drvdata(dev);
-
- /* Enable the touch-detect circuitry. */
- mxs_lradc_enable_touch_detection(lradc);
-
- return 0;
-}
-
-static void mxs_lradc_disable_ts(struct mxs_lradc *lradc)
-{
- /* stop all interrupts from firing */
- mxs_lradc_reg_clear(lradc, LRADC_CTRL1_TOUCH_DETECT_IRQ_EN |
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ_EN(TOUCHSCREEN_VCHANNEL2), LRADC_CTRL1);
-
- /* Power-down touchscreen touch-detect circuitry. */
- mxs_lradc_reg_clear(lradc, mxs_lradc_plate_mask(lradc), LRADC_CTRL0);
-}
-
-static void mxs_lradc_ts_close(struct input_dev *dev)
-{
- struct mxs_lradc *lradc = input_get_drvdata(dev);
-
- mxs_lradc_disable_ts(lradc);
-}
-
-static int mxs_lradc_ts_register(struct mxs_lradc *lradc)
-{
- struct input_dev *input;
- struct device *dev = lradc->dev;
-
- if (!lradc->use_touchscreen)
- return 0;
-
- input = devm_input_allocate_device(dev);
- if (!input)
- return -ENOMEM;
-
- input->name = DRIVER_NAME;
- input->id.bustype = BUS_HOST;
- input->open = mxs_lradc_ts_open;
- input->close = mxs_lradc_ts_close;
-
- __set_bit(EV_ABS, input->evbit);
- __set_bit(EV_KEY, input->evbit);
- __set_bit(BTN_TOUCH, input->keybit);
- __set_bit(INPUT_PROP_DIRECT, input->propbit);
- input_set_abs_params(input, ABS_X, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
- input_set_abs_params(input, ABS_Y, 0, LRADC_SINGLE_SAMPLE_MASK, 0, 0);
- input_set_abs_params(input, ABS_PRESSURE, 0, LRADC_SINGLE_SAMPLE_MASK,
- 0, 0);
-
- lradc->ts_input = input;
- input_set_drvdata(input, lradc);
-
- return input_register_device(input);
-}
-
-/*
- * IRQ Handling
- */
-static irqreturn_t mxs_lradc_handle_irq(int irq, void *data)
-{
- struct iio_dev *iio = data;
- struct mxs_lradc *lradc = iio_priv(iio);
- unsigned long reg = readl(lradc->base + LRADC_CTRL1);
- u32 clr_irq = mxs_lradc_irq_mask(lradc);
- const u32 ts_irq_mask =
- LRADC_CTRL1_TOUCH_DETECT_IRQ |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2);
-
- if (!(reg & mxs_lradc_irq_mask(lradc)))
- return IRQ_NONE;
-
- if (lradc->use_touchscreen && (reg & ts_irq_mask)) {
- mxs_lradc_handle_touch(lradc);
-
- /* Make sure we don't clear the next conversion's interrupt. */
- clr_irq &= ~(LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL1) |
- LRADC_CTRL1_LRADC_IRQ(TOUCHSCREEN_VCHANNEL2));
- }
-
- if (iio_buffer_enabled(iio)) {
- if (reg & lradc->buffer_vchans)
- iio_trigger_poll(iio->trig);
- } else if (reg & LRADC_CTRL1_LRADC_IRQ(0)) {
- complete(&lradc->completion);
- }
-
- mxs_lradc_reg_clear(lradc, reg & clr_irq, LRADC_CTRL1);
-
- return IRQ_HANDLED;
-}
-
-/*
- * Trigger handling
- */
-static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct iio_dev *iio = pf->indio_dev;
- struct mxs_lradc *lradc = iio_priv(iio);
- const u32 chan_value = LRADC_CH_ACCUMULATE |
- ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
- unsigned int i, j = 0;
-
- for_each_set_bit(i, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
- lradc->buffer[j] = readl(lradc->base + LRADC_CH(j));
- mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(j));
- lradc->buffer[j] &= LRADC_CH_VALUE_MASK;
- lradc->buffer[j] /= LRADC_DELAY_TIMER_LOOP;
- j++;
- }
-
- iio_push_to_buffers_with_timestamp(iio, lradc->buffer, pf->timestamp);
-
- iio_trigger_notify_done(iio->trig);
-
- return IRQ_HANDLED;
-}
-
-static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
-{
- struct iio_dev *iio = iio_trigger_get_drvdata(trig);
- struct mxs_lradc *lradc = iio_priv(iio);
- const u32 st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
-
- mxs_lradc_reg_wrt(lradc, LRADC_DELAY_KICK, LRADC_DELAY(0) + st);
-
- return 0;
-}
-
-static const struct iio_trigger_ops mxs_lradc_trigger_ops = {
- .owner = THIS_MODULE,
- .set_trigger_state = &mxs_lradc_configure_trigger,
-};
-
-static int mxs_lradc_trigger_init(struct iio_dev *iio)
-{
- int ret;
- struct iio_trigger *trig;
- struct mxs_lradc *lradc = iio_priv(iio);
-
- trig = iio_trigger_alloc("%s-dev%i", iio->name, iio->id);
- if (!trig)
- return -ENOMEM;
-
- trig->dev.parent = lradc->dev;
- iio_trigger_set_drvdata(trig, iio);
- trig->ops = &mxs_lradc_trigger_ops;
-
- ret = iio_trigger_register(trig);
- if (ret) {
- iio_trigger_free(trig);
- return ret;
- }
-
- lradc->trig = trig;
-
- return 0;
-}
-
-static void mxs_lradc_trigger_remove(struct iio_dev *iio)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
-
- iio_trigger_unregister(lradc->trig);
- iio_trigger_free(lradc->trig);
-}
-
-static int mxs_lradc_buffer_preenable(struct iio_dev *iio)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
- int ret = 0, chan, ofs = 0;
- unsigned long enable = 0;
- u32 ctrl4_set = 0;
- u32 ctrl4_clr = 0;
- u32 ctrl1_irq = 0;
- const u32 chan_value = LRADC_CH_ACCUMULATE |
- ((LRADC_DELAY_TIMER_LOOP - 1) << LRADC_CH_NUM_SAMPLES_OFFSET);
- const int len = bitmap_weight(iio->active_scan_mask,
- LRADC_MAX_TOTAL_CHANS);
-
- if (!len)
- return -EINVAL;
-
- /*
- * Lock the driver so raw access can not be done during buffered
- * operation. This simplifies the code a lot.
- */
- ret = mutex_trylock(&lradc->lock);
- if (!ret)
- return -EBUSY;
-
- lradc->buffer = kmalloc_array(len, sizeof(*lradc->buffer), GFP_KERNEL);
- if (!lradc->buffer) {
- ret = -ENOMEM;
- goto err_mem;
- }
-
- if (lradc->soc == IMX28_LRADC)
- mxs_lradc_reg_clear(
- lradc,
- lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
- LRADC_CTRL1);
- mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
-
- for_each_set_bit(chan, iio->active_scan_mask, LRADC_MAX_TOTAL_CHANS) {
- ctrl4_set |= chan << LRADC_CTRL4_LRADCSELECT_OFFSET(ofs);
- ctrl4_clr |= LRADC_CTRL4_LRADCSELECT_MASK(ofs);
- ctrl1_irq |= LRADC_CTRL1_LRADC_IRQ_EN(ofs);
- mxs_lradc_reg_wrt(lradc, chan_value, LRADC_CH(ofs));
- bitmap_set(&enable, ofs, 1);
- ofs++;
- }
-
- mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
- LRADC_DELAY_KICK, LRADC_DELAY(0));
- mxs_lradc_reg_clear(lradc, ctrl4_clr, LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, ctrl4_set, LRADC_CTRL4);
- mxs_lradc_reg_set(lradc, ctrl1_irq, LRADC_CTRL1);
- mxs_lradc_reg_set(lradc, enable << LRADC_DELAY_TRIGGER_LRADCS_OFFSET,
- LRADC_DELAY(0));
-
- return 0;
-
-err_mem:
- mutex_unlock(&lradc->lock);
- return ret;
-}
-
-static int mxs_lradc_buffer_postdisable(struct iio_dev *iio)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
-
- mxs_lradc_reg_clear(lradc, LRADC_DELAY_TRIGGER_LRADCS_MASK |
- LRADC_DELAY_KICK, LRADC_DELAY(0));
-
- mxs_lradc_reg_clear(lradc, lradc->buffer_vchans, LRADC_CTRL0);
- if (lradc->soc == IMX28_LRADC)
- mxs_lradc_reg_clear(
- lradc,
- lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
- LRADC_CTRL1);
-
- kfree(lradc->buffer);
- mutex_unlock(&lradc->lock);
-
- return 0;
-}
-
-static bool mxs_lradc_validate_scan_mask(struct iio_dev *iio,
- const unsigned long *mask)
-{
- struct mxs_lradc *lradc = iio_priv(iio);
- const int map_chans = bitmap_weight(mask, LRADC_MAX_TOTAL_CHANS);
- int rsvd_chans = 0;
- unsigned long rsvd_mask = 0;
-
- if (lradc->use_touchbutton)
- rsvd_mask |= CHAN_MASK_TOUCHBUTTON;
- if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_4WIRE)
- rsvd_mask |= CHAN_MASK_TOUCHSCREEN_4WIRE;
- if (lradc->use_touchscreen == MXS_LRADC_TOUCHSCREEN_5WIRE)
- rsvd_mask |= CHAN_MASK_TOUCHSCREEN_5WIRE;
-
- if (lradc->use_touchbutton)
- rsvd_chans++;
- if (lradc->use_touchscreen)
- rsvd_chans += 2;
-
- /* Test for attempts to map channels with special mode of operation. */
- if (bitmap_intersects(mask, &rsvd_mask, LRADC_MAX_TOTAL_CHANS))
- return false;
-
- /* Test for attempts to map more channels then available slots. */
- if (map_chans + rsvd_chans > LRADC_MAX_MAPPED_CHANS)
- return false;
-
- return true;
-}
-
-static const struct iio_buffer_setup_ops mxs_lradc_buffer_ops = {
- .preenable = &mxs_lradc_buffer_preenable,
- .postenable = &iio_triggered_buffer_postenable,
- .predisable = &iio_triggered_buffer_predisable,
- .postdisable = &mxs_lradc_buffer_postdisable,
- .validate_scan_mask = &mxs_lradc_validate_scan_mask,
-};
-
-/*
- * Driver initialization
- */
-
-#define MXS_ADC_CHAN(idx, chan_type, name) { \
- .type = (chan_type), \
- .indexed = 1, \
- .scan_index = (idx), \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
- BIT(IIO_CHAN_INFO_SCALE), \
- .channel = (idx), \
- .address = (idx), \
- .scan_type = { \
- .sign = 'u', \
- .realbits = LRADC_RESOLUTION, \
- .storagebits = 32, \
- }, \
- .datasheet_name = (name), \
-}
-
-static const struct iio_chan_spec mx23_lradc_chan_spec[] = {
- MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
- MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
- MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
- MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
- MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
- MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
- MXS_ADC_CHAN(6, IIO_VOLTAGE, "VDDIO"),
- MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
- /* Combined Temperature sensors */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = 8,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_OFFSET) |
- BIT(IIO_CHAN_INFO_SCALE),
- .channel = 8,
- .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
- .datasheet_name = "TEMP_DIE",
- },
- /* Hidden channel to keep indexes */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = -1,
- .channel = 9,
- },
- MXS_ADC_CHAN(10, IIO_VOLTAGE, NULL),
- MXS_ADC_CHAN(11, IIO_VOLTAGE, NULL),
- MXS_ADC_CHAN(12, IIO_VOLTAGE, "USB_DP"),
- MXS_ADC_CHAN(13, IIO_VOLTAGE, "USB_DN"),
- MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
- MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
-};
-
-static const struct iio_chan_spec mx28_lradc_chan_spec[] = {
- MXS_ADC_CHAN(0, IIO_VOLTAGE, "LRADC0"),
- MXS_ADC_CHAN(1, IIO_VOLTAGE, "LRADC1"),
- MXS_ADC_CHAN(2, IIO_VOLTAGE, "LRADC2"),
- MXS_ADC_CHAN(3, IIO_VOLTAGE, "LRADC3"),
- MXS_ADC_CHAN(4, IIO_VOLTAGE, "LRADC4"),
- MXS_ADC_CHAN(5, IIO_VOLTAGE, "LRADC5"),
- MXS_ADC_CHAN(6, IIO_VOLTAGE, "LRADC6"),
- MXS_ADC_CHAN(7, IIO_VOLTAGE, "VBATT"),
- /* Combined Temperature sensors */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = 8,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_OFFSET) |
- BIT(IIO_CHAN_INFO_SCALE),
- .channel = 8,
- .scan_type = {.sign = 'u', .realbits = 18, .storagebits = 32,},
- .datasheet_name = "TEMP_DIE",
- },
- /* Hidden channel to keep indexes */
- {
- .type = IIO_TEMP,
- .indexed = 1,
- .scan_index = -1,
- .channel = 9,
- },
- MXS_ADC_CHAN(10, IIO_VOLTAGE, "VDDIO"),
- MXS_ADC_CHAN(11, IIO_VOLTAGE, "VTH"),
- MXS_ADC_CHAN(12, IIO_VOLTAGE, "VDDA"),
- MXS_ADC_CHAN(13, IIO_VOLTAGE, "VDDD"),
- MXS_ADC_CHAN(14, IIO_VOLTAGE, "VBG"),
- MXS_ADC_CHAN(15, IIO_VOLTAGE, "VDD5V"),
-};
-
-static void mxs_lradc_hw_init(struct mxs_lradc *lradc)
-{
- /* The ADC always uses DELAY CHANNEL 0. */
- const u32 adc_cfg =
- (1 << (LRADC_DELAY_TRIGGER_DELAYS_OFFSET + 0)) |
- (LRADC_DELAY_TIMER_PER << LRADC_DELAY_DELAY_OFFSET);
-
- /* Configure DELAY CHANNEL 0 for generic ADC sampling. */
- mxs_lradc_reg_wrt(lradc, adc_cfg, LRADC_DELAY(0));
-
- /* Disable remaining DELAY CHANNELs */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(1));
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(2));
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(3));
-
- /* Start internal temperature sensing. */
- mxs_lradc_reg_wrt(lradc, 0, LRADC_CTRL2);
-}
-
-static void mxs_lradc_hw_stop(struct mxs_lradc *lradc)
-{
- int i;
-
- mxs_lradc_reg_clear(lradc,
- lradc->buffer_vchans << LRADC_CTRL1_LRADC_IRQ_EN_OFFSET,
- LRADC_CTRL1);
-
- for (i = 0; i < LRADC_MAX_DELAY_CHANS; i++)
- mxs_lradc_reg_wrt(lradc, 0, LRADC_DELAY(i));
-}
-
-static const struct of_device_id mxs_lradc_dt_ids[] = {
- { .compatible = "fsl,imx23-lradc", .data = (void *)IMX23_LRADC, },
- { .compatible = "fsl,imx28-lradc", .data = (void *)IMX28_LRADC, },
- { /* sentinel */ }
-};
-MODULE_DEVICE_TABLE(of, mxs_lradc_dt_ids);
-
-static int mxs_lradc_probe_touchscreen(struct mxs_lradc *lradc,
- struct device_node *lradc_node)
-{
- int ret;
- u32 ts_wires = 0, adapt;
-
- ret = of_property_read_u32(lradc_node, "fsl,lradc-touchscreen-wires",
- &ts_wires);
- if (ret)
- return -ENODEV; /* touchscreen feature disabled */
-
- switch (ts_wires) {
- case 4:
- lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_4WIRE;
- break;
- case 5:
- if (lradc->soc == IMX28_LRADC) {
- lradc->use_touchscreen = MXS_LRADC_TOUCHSCREEN_5WIRE;
- break;
- }
- /* fall through an error message for i.MX23 */
- default:
- dev_err(lradc->dev,
- "Unsupported number of touchscreen wires (%d)\n",
- ts_wires);
- return -EINVAL;
- }
-
- if (of_property_read_u32(lradc_node, "fsl,ave-ctrl", &adapt)) {
- lradc->over_sample_cnt = 4;
- } else {
- if (adapt < 1 || adapt > 32) {
- dev_err(lradc->dev, "Invalid sample count (%u)\n",
- adapt);
- return -EINVAL;
- }
- lradc->over_sample_cnt = adapt;
- }
-
- if (of_property_read_u32(lradc_node, "fsl,ave-delay", &adapt)) {
- lradc->over_sample_delay = 2;
- } else {
- if (adapt < 2 || adapt > LRADC_DELAY_DELAY_MASK + 1) {
- dev_err(lradc->dev, "Invalid sample delay (%u)\n",
- adapt);
- return -EINVAL;
- }
- lradc->over_sample_delay = adapt;
- }
-
- if (of_property_read_u32(lradc_node, "fsl,settling", &adapt)) {
- lradc->settling_delay = 10;
- } else {
- if (adapt < 1 || adapt > LRADC_DELAY_DELAY_MASK) {
- dev_err(lradc->dev, "Invalid settling delay (%u)\n",
- adapt);
- return -EINVAL;
- }
- lradc->settling_delay = adapt;
- }
-
- return 0;
-}
-
-static int mxs_lradc_probe(struct platform_device *pdev)
-{
- const struct of_device_id *of_id =
- of_match_device(mxs_lradc_dt_ids, &pdev->dev);
- const struct mxs_lradc_of_config *of_cfg =
- &mxs_lradc_of_config[(enum mxs_lradc_id)of_id->data];
- struct device *dev = &pdev->dev;
- struct device_node *node = dev->of_node;
- struct mxs_lradc *lradc;
- struct iio_dev *iio;
- struct resource *iores;
- int ret = 0, touch_ret;
- int i, s;
- u64 scale_uv;
-
- /* Allocate the IIO device. */
- iio = devm_iio_device_alloc(dev, sizeof(*lradc));
- if (!iio) {
- dev_err(dev, "Failed to allocate IIO device\n");
- return -ENOMEM;
- }
-
- lradc = iio_priv(iio);
- lradc->soc = (enum mxs_lradc_id)of_id->data;
-
- /* Grab the memory area */
- iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- lradc->dev = &pdev->dev;
- lradc->base = devm_ioremap_resource(dev, iores);
- if (IS_ERR(lradc->base))
- return PTR_ERR(lradc->base);
-
- lradc->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(lradc->clk)) {
- dev_err(dev, "Failed to get the delay unit clock\n");
- return PTR_ERR(lradc->clk);
- }
- ret = clk_prepare_enable(lradc->clk);
- if (ret != 0) {
- dev_err(dev, "Failed to enable the delay unit clock\n");
- return ret;
- }
-
- touch_ret = mxs_lradc_probe_touchscreen(lradc, node);
-
- if (touch_ret == 0)
- lradc->buffer_vchans = BUFFER_VCHANS_LIMITED;
- else
- lradc->buffer_vchans = BUFFER_VCHANS_ALL;
-
- /* Grab all IRQ sources */
- for (i = 0; i < of_cfg->irq_count; i++) {
- lradc->irq[i] = platform_get_irq(pdev, i);
- if (lradc->irq[i] < 0) {
- ret = lradc->irq[i];
- goto err_clk;
- }
-
- ret = devm_request_irq(dev, lradc->irq[i],
- mxs_lradc_handle_irq, 0,
- of_cfg->irq_name[i], iio);
- if (ret)
- goto err_clk;
- }
-
- lradc->vref_mv = of_cfg->vref_mv;
-
- platform_set_drvdata(pdev, iio);
-
- init_completion(&lradc->completion);
- mutex_init(&lradc->lock);
-
- iio->name = pdev->name;
- iio->dev.parent = &pdev->dev;
- iio->info = &mxs_lradc_iio_info;
- iio->modes = INDIO_DIRECT_MODE;
- iio->masklength = LRADC_MAX_TOTAL_CHANS;
-
- if (lradc->soc == IMX23_LRADC) {
- iio->channels = mx23_lradc_chan_spec;
- iio->num_channels = ARRAY_SIZE(mx23_lradc_chan_spec);
- } else {
- iio->channels = mx28_lradc_chan_spec;
- iio->num_channels = ARRAY_SIZE(mx28_lradc_chan_spec);
- }
-
- ret = iio_triggered_buffer_setup(iio, &iio_pollfunc_store_time,
- &mxs_lradc_trigger_handler,
- &mxs_lradc_buffer_ops);
- if (ret)
- goto err_clk;
-
- ret = mxs_lradc_trigger_init(iio);
- if (ret)
- goto err_trig;
-
- /* Populate available ADC input ranges */
- for (i = 0; i < LRADC_MAX_TOTAL_CHANS; i++) {
- for (s = 0; s < ARRAY_SIZE(lradc->scale_avail[i]); s++) {
- /*
- * [s=0] = optional divider by two disabled (default)
- * [s=1] = optional divider by two enabled
- *
- * The scale is calculated by doing:
- * Vref >> (realbits - s)
- * which multiplies by two on the second component
- * of the array.
- */
- scale_uv = ((u64)lradc->vref_mv[i] * 100000000) >>
- (LRADC_RESOLUTION - s);
- lradc->scale_avail[i][s].nano =
- do_div(scale_uv, 100000000) * 10;
- lradc->scale_avail[i][s].integer = scale_uv;
- }
- }
-
- ret = stmp_reset_block(lradc->base);
- if (ret)
- goto err_dev;
-
- /* Configure the hardware. */
- mxs_lradc_hw_init(lradc);
-
- /* Register the touchscreen input device. */
- if (touch_ret == 0) {
- ret = mxs_lradc_ts_register(lradc);
- if (ret)
- goto err_ts_register;
- }
-
- /* Register IIO device. */
- ret = iio_device_register(iio);
- if (ret) {
- dev_err(dev, "Failed to register IIO device\n");
- return ret;
- }
-
- return 0;
-
-err_ts_register:
- mxs_lradc_hw_stop(lradc);
-err_dev:
- mxs_lradc_trigger_remove(iio);
-err_trig:
- iio_triggered_buffer_cleanup(iio);
-err_clk:
- clk_disable_unprepare(lradc->clk);
- return ret;
-}
-
-static int mxs_lradc_remove(struct platform_device *pdev)
-{
- struct iio_dev *iio = platform_get_drvdata(pdev);
- struct mxs_lradc *lradc = iio_priv(iio);
-
- iio_device_unregister(iio);
- mxs_lradc_hw_stop(lradc);
- mxs_lradc_trigger_remove(iio);
- iio_triggered_buffer_cleanup(iio);
-
- clk_disable_unprepare(lradc->clk);
-
- return 0;
-}
-
-static struct platform_driver mxs_lradc_driver = {
- .driver = {
- .name = DRIVER_NAME,
- .of_match_table = mxs_lradc_dt_ids,
- },
- .probe = mxs_lradc_probe,
- .remove = mxs_lradc_remove,
-};
-
-module_platform_driver(mxs_lradc_driver);
-
-MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
-MODULE_DESCRIPTION("Freescale MXS LRADC driver");
-MODULE_LICENSE("GPL v2");
-MODULE_ALIAS("platform:" DRIVER_NAME);
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff