--- /dev/null
+/*
+ * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
+ * Copyright (c) 2009 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-chip-ident.h>
+
+#define DRIVER_NAME "tef6862"
+
+#define FREQ_MUL 16000
+
+#define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
+#define TEF6862_HI_FREQ (108 * FREQ_MUL)
+
+/* Write mode sub addresses */
+#define WM_SUB_BANDWIDTH 0x0
+#define WM_SUB_PLLM 0x1
+#define WM_SUB_PLLL 0x2
+#define WM_SUB_DAA 0x3
+#define WM_SUB_AGC 0x4
+#define WM_SUB_BAND 0x5
+#define WM_SUB_CONTROL 0x6
+#define WM_SUB_LEVEL 0x7
+#define WM_SUB_IFCF 0x8
+#define WM_SUB_IFCAP 0x9
+#define WM_SUB_ACD 0xA
+#define WM_SUB_TEST 0xF
+
+/* Different modes of the MSA register */
+#define MODE_BUFFER 0x0
+#define MODE_PRESET 0x1
+#define MODE_SEARCH 0x2
+#define MODE_AF_UPDATE 0x3
+#define MODE_JUMP 0x4
+#define MODE_CHECK 0x5
+#define MODE_LOAD 0x6
+#define MODE_END 0x7
+#define MODE_SHIFT 5
+
+struct tef6862_state {
+ struct v4l2_subdev sd;
+ unsigned long freq;
+};
+
+static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
+{
+ return container_of(sd, struct tef6862_state, sd);
+}
+
+static u16 tef6862_sigstr(struct i2c_client *client)
+{
+ u8 buf[4];
+ int err = i2c_master_recv(client, buf, sizeof(buf));
+ if (err == sizeof(buf))
+ return buf[3] << 8;
+ return 0;
+}
+
+static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
+{
+ if (v->index > 0)
+ return -EINVAL;
+
+ /* only support FM for now */
+ strlcpy(v->name, "FM", sizeof(v->name));
+ v->type = V4L2_TUNER_RADIO;
+ v->rangelow = TEF6862_LO_FREQ;
+ v->rangehigh = TEF6862_HI_FREQ;
+ v->rxsubchans = V4L2_TUNER_SUB_MONO;
+ v->capability = V4L2_TUNER_CAP_LOW;
+ v->audmode = V4L2_TUNER_MODE_STEREO;
+ v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
+
+ return 0;
+}
+
+static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
+{
+ return v->index ? -EINVAL : 0;
+}
+
+static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
+{
+ struct tef6862_state *state = to_state(sd);
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+ u16 pll;
+ u8 i2cmsg[3];
+ int err;
+
+ if (f->tuner != 0)
+ return -EINVAL;
+
+ pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
+ i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;
+ i2cmsg[1] = (pll >> 8) & 0xff;
+ i2cmsg[2] = pll & 0xff;
+
+ err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
+ if (!err)
+ state->freq = f->frequency;
+ return err;
+}
+
+static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
+{
+ struct tef6862_state *state = to_state(sd);
+
+ if (f->tuner != 0)
+ return -EINVAL;
+ f->type = V4L2_TUNER_RADIO;
+ f->frequency = state->freq;
+ return 0;
+}
+
+static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
+ struct v4l2_dbg_chip_ident *chip)
+{
+ struct i2c_client *client = v4l2_get_subdevdata(sd);
+
+ return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
+}
+
+static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
+ .g_tuner = tef6862_g_tuner,
+ .s_tuner = tef6862_s_tuner,
+ .s_frequency = tef6862_s_frequency,
+ .g_frequency = tef6862_g_frequency,
+};
+
+static const struct v4l2_subdev_core_ops tef6862_core_ops = {
+ .g_chip_ident = tef6862_g_chip_ident,
+};
+
+static const struct v4l2_subdev_ops tef6862_ops = {
+ .core = &tef6862_core_ops,
+ .tuner = &tef6862_tuner_ops,
+};
+
+/*
+ * Generic i2c probe
+ * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
+ */
+
+static int __devinit tef6862_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct tef6862_state *state;
+ struct v4l2_subdev *sd;
+
+ /* Check if the adapter supports the needed features */
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+ return -EIO;
+
+ v4l_info(client, "chip found @ 0x%02x (%s)\n",
+ client->addr << 1, client->adapter->name);
+
+ state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+ state->freq = TEF6862_LO_FREQ;
+
+ sd = &state->sd;
+ v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
+
+ return 0;
+}
+
+static int __devexit tef6862_remove(struct i2c_client *client)
+{
+ struct v4l2_subdev *sd = i2c_get_clientdata(client);
+
+ v4l2_device_unregister_subdev(sd);
+ kfree(to_state(sd));
+ return 0;
+}
+
+static const struct i2c_device_id tef6862_id[] = {
+ {DRIVER_NAME, 0},
+ {},
+};
+
+MODULE_DEVICE_TABLE(i2c, tef6862_id);
+
+static struct i2c_driver tef6862_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRIVER_NAME,
+ },
+ .probe = tef6862_probe,
+ .remove = tef6862_remove,
+ .id_table = tef6862_id,
+};
+
+static __init int tef6862_init(void)
+{
+ return i2c_add_driver(&tef6862_driver);
+}
+
+static __exit void tef6862_exit(void)
+{
+ i2c_del_driver(&tef6862_driver);
+}
+
+module_init(tef6862_init);
+module_exit(tef6862_exit);
+
+MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
+MODULE_AUTHOR("Mocean Laboratories");
+MODULE_LICENSE("GPL v2");
+
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / commitdiff