| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| tda9840 - i2c-driver for the tda9840 by SGS Thomson |
| |
| Copyright (C) 1998-2003 Michael Hunold <michael@mihu.de> |
| Copyright (C) 2008 Hans Verkuil <hverkuil@xs4all.nl> |
| |
| The tda9840 is a stereo/dual sound processor with digital |
| identification. It can be found at address 0x84 on the i2c-bus. |
| |
| For detailed information download the specifications directly |
| from SGS Thomson at http://www.st.com |
| |
| */ |
| |
| |
| #include <linux/module.h> |
| #include <linux/ioctl.h> |
| #include <linux/slab.h> |
| #include <linux/i2c.h> |
| #include <media/v4l2-device.h> |
| |
| MODULE_AUTHOR("Michael Hunold <michael@mihu.de>"); |
| MODULE_DESCRIPTION("tda9840 driver"); |
| MODULE_LICENSE("GPL"); |
| |
| static int debug; |
| module_param(debug, int, 0644); |
| |
| MODULE_PARM_DESC(debug, "Debug level (0-1)"); |
| |
| #define SWITCH 0x00 |
| #define LEVEL_ADJUST 0x02 |
| #define STEREO_ADJUST 0x03 |
| #define TEST 0x04 |
| |
| #define TDA9840_SET_MUTE 0x00 |
| #define TDA9840_SET_MONO 0x10 |
| #define TDA9840_SET_STEREO 0x2a |
| #define TDA9840_SET_LANG1 0x12 |
| #define TDA9840_SET_LANG2 0x1e |
| #define TDA9840_SET_BOTH 0x1a |
| #define TDA9840_SET_BOTH_R 0x16 |
| #define TDA9840_SET_EXTERNAL 0x7a |
| |
| |
| static void tda9840_write(struct v4l2_subdev *sd, u8 reg, u8 val) |
| { |
| struct i2c_client *client = v4l2_get_subdevdata(sd); |
| |
| if (i2c_smbus_write_byte_data(client, reg, val)) |
| v4l2_dbg(1, debug, sd, "error writing %02x to %02x\n", |
| val, reg); |
| } |
| |
| static int tda9840_status(struct v4l2_subdev *sd) |
| { |
| struct i2c_client *client = v4l2_get_subdevdata(sd); |
| int rc; |
| u8 byte; |
| |
| rc = i2c_master_recv(client, &byte, 1); |
| if (rc != 1) { |
| v4l2_dbg(1, debug, sd, |
| "i2c_master_recv() failed\n"); |
| if (rc < 0) |
| return rc; |
| return -EIO; |
| } |
| |
| if (byte & 0x80) { |
| v4l2_dbg(1, debug, sd, |
| "TDA9840_DETECT: register contents invalid\n"); |
| return -EINVAL; |
| } |
| |
| v4l2_dbg(1, debug, sd, "TDA9840_DETECT: byte: 0x%02x\n", byte); |
| return byte & 0x60; |
| } |
| |
| static int tda9840_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *t) |
| { |
| int stat = tda9840_status(sd); |
| int byte; |
| |
| if (t->index) |
| return -EINVAL; |
| |
| stat = stat < 0 ? 0 : stat; |
| if (stat == 0 || stat == 0x60) /* mono input */ |
| byte = TDA9840_SET_MONO; |
| else if (stat == 0x40) /* stereo input */ |
| byte = (t->audmode == V4L2_TUNER_MODE_MONO) ? |
| TDA9840_SET_MONO : TDA9840_SET_STEREO; |
| else { /* bilingual */ |
| switch (t->audmode) { |
| case V4L2_TUNER_MODE_LANG1_LANG2: |
| byte = TDA9840_SET_BOTH; |
| break; |
| case V4L2_TUNER_MODE_LANG2: |
| byte = TDA9840_SET_LANG2; |
| break; |
| default: |
| byte = TDA9840_SET_LANG1; |
| break; |
| } |
| } |
| v4l2_dbg(1, debug, sd, "TDA9840_SWITCH: 0x%02x\n", byte); |
| tda9840_write(sd, SWITCH, byte); |
| return 0; |
| } |
| |
| static int tda9840_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *t) |
| { |
| int stat = tda9840_status(sd); |
| |
| if (stat < 0) |
| return stat; |
| |
| t->rxsubchans = V4L2_TUNER_SUB_MONO; |
| |
| switch (stat & 0x60) { |
| case 0x00: |
| t->rxsubchans = V4L2_TUNER_SUB_MONO; |
| break; |
| case 0x20: |
| t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2; |
| break; |
| case 0x40: |
| t->rxsubchans = V4L2_TUNER_SUB_STEREO | V4L2_TUNER_SUB_MONO; |
| break; |
| default: /* Incorrect detect */ |
| t->rxsubchans = V4L2_TUNER_MODE_MONO; |
| break; |
| } |
| return 0; |
| } |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| static const struct v4l2_subdev_tuner_ops tda9840_tuner_ops = { |
| .s_tuner = tda9840_s_tuner, |
| .g_tuner = tda9840_g_tuner, |
| }; |
| |
| static const struct v4l2_subdev_ops tda9840_ops = { |
| .tuner = &tda9840_tuner_ops, |
| }; |
| |
| /* ----------------------------------------------------------------------- */ |
| |
| static int tda9840_probe(struct i2c_client *client) |
| { |
| struct v4l2_subdev *sd; |
| |
| /* let's see whether this adapter can support what we need */ |
| if (!i2c_check_functionality(client->adapter, |
| I2C_FUNC_SMBUS_READ_BYTE_DATA | |
| I2C_FUNC_SMBUS_WRITE_BYTE_DATA)) |
| return -EIO; |
| |
| v4l_info(client, "chip found @ 0x%x (%s)\n", |
| client->addr << 1, client->adapter->name); |
| |
| sd = devm_kzalloc(&client->dev, sizeof(*sd), GFP_KERNEL); |
| if (sd == NULL) |
| return -ENOMEM; |
| v4l2_i2c_subdev_init(sd, client, &tda9840_ops); |
| |
| /* set initial values for level & stereo - adjustment, mode */ |
| tda9840_write(sd, LEVEL_ADJUST, 0); |
| tda9840_write(sd, STEREO_ADJUST, 0); |
| tda9840_write(sd, SWITCH, TDA9840_SET_STEREO); |
| return 0; |
| } |
| |
| static void tda9840_remove(struct i2c_client *client) |
| { |
| struct v4l2_subdev *sd = i2c_get_clientdata(client); |
| |
| v4l2_device_unregister_subdev(sd); |
| } |
| |
| static const struct i2c_device_id tda9840_id[] = { |
| { "tda9840", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, tda9840_id); |
| |
| static struct i2c_driver tda9840_driver = { |
| .driver = { |
| .name = "tda9840", |
| }, |
| .probe_new = tda9840_probe, |
| .remove = tda9840_remove, |
| .id_table = tda9840_id, |
| }; |
| |
| module_i2c_driver(tda9840_driver); |