Quelle  cs5345.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * cs5345 Cirrus Logic 24-bit, 192 kHz Stereo Audio ADC
 * Copyright (C) 2007 Hans Verkuil
 */


#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/i2c.h>
#include <linux/videodev2.h>
#include <linux/slab.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>

MODULE_DESCRIPTION("i2c device driver for cs5345 Audio ADC");
MODULE_AUTHOR("Hans Verkuil");
MODULE_LICENSE("GPL");

static bool debug;

module_param(debug, bool, 0644);

MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");

struct cs5345_state {
 struct v4l2_subdev sd;
 struct v4l2_ctrl_handler hdl;
};

static inline struct cs5345_state *to_state(struct v4l2_subdev *sd)
{
 return container_of(sd, struct cs5345_state, sd);
}

static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
{
 return &container_of(ctrl->handler, struct cs5345_state, hdl)->sd;
}

/* ----------------------------------------------------------------------- */

static inline int cs5345_write(struct v4l2_subdev *sd, u8 reg, u8 value)
{
 struct i2c_client *client = v4l2_get_subdevdata(sd);

 return i2c_smbus_write_byte_data(client, reg, value);
}

static inline int cs5345_read(struct v4l2_subdev *sd, u8 reg)
{
 struct i2c_client *client = v4l2_get_subdevdata(sd);

 return i2c_smbus_read_byte_data(client, reg);
}

static int cs5345_s_routing(struct v4l2_subdev *sd,
       u32 input, u32 output, u32 config)
{
 if ((input & 0xf) > 6) {
  v4l2_err(sd, "Invalid input %d.\n", input);
  return -EINVAL;
 }
 cs5345_write(sd, 0x09, input & 0xf);
 cs5345_write(sd, 0x05, input & 0xf0);
 return 0;
}

static int cs5345_s_ctrl(struct v4l2_ctrl *ctrl)
{
 struct v4l2_subdev *sd = to_sd(ctrl);

 switch (ctrl->id) {
 case V4L2_CID_AUDIO_MUTE:
  cs5345_write(sd, 0x04, ctrl->val ? 0x80 : 0);
  return 0;
 case V4L2_CID_AUDIO_VOLUME:
  cs5345_write(sd, 0x07, ((u8)ctrl->val) & 0x3f);
  cs5345_write(sd, 0x08, ((u8)ctrl->val) & 0x3f);
  return 0;
 }
 return -EINVAL;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int cs5345_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
 reg->size = 1;
 reg->val = cs5345_read(sd, reg->reg & 0x1f);
 return 0;
}

static int cs5345_s_register(struct v4l2_subdev *sd, const struct v4l2_dbg_register *reg)
{
 cs5345_write(sd, reg->reg & 0x1f, reg->val & 0xff);
 return 0;
}
#endif

static int cs5345_log_status(struct v4l2_subdev *sd)
{
 u8 v = cs5345_read(sd, 0x09) & 7;
 u8 m = cs5345_read(sd, 0x04);
 int vol = cs5345_read(sd, 0x08) & 0x3f;

 v4l2_info(sd, "Input: %d%s\n", v,
   (m & 0x80) ? " (muted)" : "");
 if (vol >= 32)
  vol = vol - 64;
 v4l2_info(sd, "Volume: %d dB\n", vol);
 return 0;
}

/* ----------------------------------------------------------------------- */

static const struct v4l2_ctrl_ops cs5345_ctrl_ops = {
 .s_ctrl = cs5345_s_ctrl,
};

static const struct v4l2_subdev_core_ops cs5345_core_ops = {
 .log_status = cs5345_log_status,
#ifdef CONFIG_VIDEO_ADV_DEBUG
 .g_register = cs5345_g_register,
 .s_register = cs5345_s_register,
#endif
};

static const struct v4l2_subdev_audio_ops cs5345_audio_ops = {
 .s_routing = cs5345_s_routing,
};

static const struct v4l2_subdev_ops cs5345_ops = {
 .core = &cs5345_core_ops,
 .audio = &cs5345_audio_ops,
};

/* ----------------------------------------------------------------------- */

static int cs5345_probe(struct i2c_client *client)
{
 struct cs5345_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%x (%s)\n",
   client->addr << 1, client->adapter->name);

 state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
 if (state == NULL)
  return -ENOMEM;
 sd = &state->sd;
 v4l2_i2c_subdev_init(sd, client, &cs5345_ops);

 v4l2_ctrl_handler_init(&state->hdl, 2);
 v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
   V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 v4l2_ctrl_new_std(&state->hdl, &cs5345_ctrl_ops,
   V4L2_CID_AUDIO_VOLUME, -24, 24, 1, 0);
 sd->ctrl_handler = &state->hdl;
 if (state->hdl.error) {
  int err = state->hdl.error;

  v4l2_ctrl_handler_free(&state->hdl);
  return err;
 }
 /* set volume/mute */
 v4l2_ctrl_handler_setup(&state->hdl);

 cs5345_write(sd, 0x02, 0x00);
 cs5345_write(sd, 0x04, 0x01);
 cs5345_write(sd, 0x09, 0x01);
 return 0;
}

/* ----------------------------------------------------------------------- */

static void cs5345_remove(struct i2c_client *client)
{
 struct v4l2_subdev *sd = i2c_get_clientdata(client);
 struct cs5345_state *state = to_state(sd);

 v4l2_device_unregister_subdev(sd);
 v4l2_ctrl_handler_free(&state->hdl);
}

/* ----------------------------------------------------------------------- */

static const struct i2c_device_id cs5345_id[] = {
 { "cs5345" },
 { }
};
MODULE_DEVICE_TABLE(i2c, cs5345_id);

static struct i2c_driver cs5345_driver = {
 .driver = {
  .name = "cs5345",
 },
 .probe  = cs5345_probe,
 .remove  = cs5345_remove,
 .id_table = cs5345_id,
};

module_i2c_driver(cs5345_driver);