drivers/media/i2c/wm8739.c - kernel/quantenna - Git at Google

 /*
  * wm8739
  *
  * Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
  *
  * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  * - Cleanup
  *
  * 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.
  *
  * 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/types.h>
 #include <linux/slab.h>
 #include <linux/ioctl.h>
 #include <asm/uaccess.h>
 #include <linux/i2c.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-ctrls.h>

 MODULE_DESCRIPTION("wm8739 driver");
 MODULE_AUTHOR("T. Adachi, Hans Verkuil");
 MODULE_LICENSE("GPL");

 static int debug;

 module_param(debug, int, 0644);

 MODULE_PARM_DESC(debug, "Debug level (0-1)");


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

 enum {
 	R0 = 0, R1,
 	R5 = 5, R6, R7, R8, R9, R15 = 15,
 	TOT_REGS
 };

 struct wm8739_state {
 	struct v4l2_subdev sd;
 	struct v4l2_ctrl_handler hdl;
 	struct {
 		/* audio cluster */
 		struct v4l2_ctrl *volume;
 		struct v4l2_ctrl *mute;
 		struct v4l2_ctrl *balance;
 	};
 	u32 clock_freq;
 };

 static inline struct wm8739_state *to_state(struct v4l2_subdev *sd)
 {
 	return container_of(sd, struct wm8739_state, sd);
 }

 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
 {
 	return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
 }

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

 static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(sd);
 	int i;

 	if (reg < 0 || reg >= TOT_REGS) {
 		v4l2_err(sd, "Invalid register R%d\n", reg);
 		return -1;
 	}

 	v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);

 	for (i = 0; i < 3; i++)
 		if (i2c_smbus_write_byte_data(client,
 				(reg << 1) | (val >> 8), val & 0xff) == 0)
 			return 0;
 	v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
 	return -1;
 }

 static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
 {
 	struct v4l2_subdev *sd = to_sd(ctrl);
 	struct wm8739_state *state = to_state(sd);
 	unsigned int work_l, work_r;
 	u8 vol_l;	/* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 	u8 vol_r;	/* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
 	u16 mute;

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_VOLUME:
 		break;

 	default:
 		return -EINVAL;
 	}

 	/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 	work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
 	work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;

 	vol_l = (long)work_l * 31 / 65535;
 	vol_r = (long)work_r * 31 / 65535;

 	/* set audio volume etc. */
 	mute = state->mute->val ? 0x80 : 0;

 	/* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
 	 * Default setting: 0x17 = 0 dB
 	 */
 	wm8739_write(sd, R0, (vol_l & 0x1f) | mute);
 	wm8739_write(sd, R1, (vol_r & 0x1f) | mute);
 	return 0;
 }

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

 static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
 {
 	struct wm8739_state *state = to_state(sd);

 	state->clock_freq = audiofreq;
 	/* de-activate */
 	wm8739_write(sd, R9, 0x000);
 	switch (audiofreq) {
 	case 44100:
 		/* 256fps, fs=44.1k */
 		wm8739_write(sd, R8, 0x020);
 		break;
 	case 48000:
 		/* 256fps, fs=48k */
 		wm8739_write(sd, R8, 0x000);
 		break;
 	case 32000:
 		/* 256fps, fs=32k */
 		wm8739_write(sd, R8, 0x018);
 		break;
 	default:
 		break;
 	}
 	/* activate */
 	wm8739_write(sd, R9, 0x001);
 	return 0;
 }

 static int wm8739_log_status(struct v4l2_subdev *sd)
 {
 	struct wm8739_state *state = to_state(sd);

 	v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
 	v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 	return 0;
 }

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

 static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
 	.s_ctrl = wm8739_s_ctrl,
 };

 static const struct v4l2_subdev_core_ops wm8739_core_ops = {
 	.log_status = wm8739_log_status,
 };

 static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
 	.s_clock_freq = wm8739_s_clock_freq,
 };

 static const struct v4l2_subdev_ops wm8739_ops = {
 	.core = &wm8739_core_ops,
 	.audio = &wm8739_audio_ops,
 };

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

 /* i2c implementation */

 static int wm8739_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct wm8739_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, &wm8739_ops);
 	v4l2_ctrl_handler_init(&state->hdl, 2);
 	state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 			V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
 	state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 			V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 	state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
 			V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
 	sd->ctrl_handler = &state->hdl;
 	if (state->hdl.error) {
 		int err = state->hdl.error;

 		v4l2_ctrl_handler_free(&state->hdl);
 		return err;
 	}
 	v4l2_ctrl_cluster(3, &state->volume);

 	state->clock_freq = 48000;

 	/* Initialize wm8739 */

 	/* reset */
 	wm8739_write(sd, R15, 0x00);
 	/* filter setting, high path, offet clear */
 	wm8739_write(sd, R5, 0x000);
 	/* ADC, OSC, Power Off mode Disable */
 	wm8739_write(sd, R6, 0x000);
 	/* Digital Audio interface format:
 	   Enable Master mode, 24 bit, MSB first/left justified */
 	wm8739_write(sd, R7, 0x049);
 	/* sampling control: normal, 256fs, 48KHz sampling rate */
 	wm8739_write(sd, R8, 0x000);
 	/* activate */
 	wm8739_write(sd, R9, 0x001);
 	/* set volume/mute */
 	v4l2_ctrl_handler_setup(&state->hdl);
 	return 0;
 }

 static int wm8739_remove(struct i2c_client *client)
 {
 	struct v4l2_subdev *sd = i2c_get_clientdata(client);
 	struct wm8739_state *state = to_state(sd);

 	v4l2_device_unregister_subdev(sd);
 	v4l2_ctrl_handler_free(&state->hdl);
 	return 0;
 }

 static const struct i2c_device_id wm8739_id[] = {
 	{ "wm8739", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, wm8739_id);

 static struct i2c_driver wm8739_driver = {
 	.driver = {
 		.name	= "wm8739",
 	},
 	.probe		= wm8739_probe,
 	.remove		= wm8739_remove,
 	.id_table	= wm8739_id,
 };

 module_i2c_driver(wm8739_driver);
	/*
	* wm8739
	*
	* Copyright (C) 2005 T. Adachi <tadachi@tadachi-net.com>
	*
	* Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
	* - Cleanup
	*
	* 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.
	*
	* 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/types.h>
	#include <linux/slab.h>
	#include <linux/ioctl.h>
	#include <asm/uaccess.h>
	#include <linux/i2c.h>
	#include <linux/videodev2.h>
	#include <media/v4l2-device.h>
	#include <media/v4l2-ctrls.h>

	MODULE_DESCRIPTION("wm8739 driver");
	MODULE_AUTHOR("T. Adachi, Hans Verkuil");
	MODULE_LICENSE("GPL");

	static int debug;

	module_param(debug, int, 0644);

	MODULE_PARM_DESC(debug, "Debug level (0-1)");


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

	enum {
	R0 = 0, R1,
	R5 = 5, R6, R7, R8, R9, R15 = 15,
	TOT_REGS
	};

	struct wm8739_state {
	struct v4l2_subdev sd;
	struct v4l2_ctrl_handler hdl;
	struct {
	/* audio cluster */
	struct v4l2_ctrl *volume;
	struct v4l2_ctrl *mute;
	struct v4l2_ctrl *balance;
	};
	u32 clock_freq;
	};

	static inline struct wm8739_state to_state(struct v4l2_subdev sd)
	{
	return container_of(sd, struct wm8739_state, sd);
	}

	static inline struct v4l2_subdev to_sd(struct v4l2_ctrl ctrl)
	{
	return &container_of(ctrl->handler, struct wm8739_state, hdl)->sd;
	}

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

	static int wm8739_write(struct v4l2_subdev *sd, int reg, u16 val)
	{
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	int i;

	if (reg < 0 \|\| reg >= TOT_REGS) {
	v4l2_err(sd, "Invalid register R%d\n", reg);
	return -1;
	}

	v4l2_dbg(1, debug, sd, "write: %02x %02x\n", reg, val);

	for (i = 0; i < 3; i++)
	if (i2c_smbus_write_byte_data(client,
	(reg << 1) \| (val >> 8), val & 0xff) == 0)
	return 0;
	v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
	return -1;
	}

	static int wm8739_s_ctrl(struct v4l2_ctrl *ctrl)
	{
	struct v4l2_subdev *sd = to_sd(ctrl);
	struct wm8739_state *state = to_state(sd);
	unsigned int work_l, work_r;
	u8 vol_l; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
	u8 vol_r; /* +12dB to -34.5dB 1.5dB step (5bit) def:0dB */
	u16 mute;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_VOLUME:
	break;

	default:
	return -EINVAL;
	}

	/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
	work_l = (min(65536 - state->balance->val, 32768) * state->volume->val) / 32768;
	work_r = (min(state->balance->val, 32768) * state->volume->val) / 32768;

	vol_l = (long)work_l * 31 / 65535;
	vol_r = (long)work_r * 31 / 65535;

	/* set audio volume etc. */
	mute = state->mute->val ? 0x80 : 0;

	/* Volume setting: bits 0-4, 0x1f = 12 dB, 0x00 = -34.5 dB
	* Default setting: 0x17 = 0 dB
	*/
	wm8739_write(sd, R0, (vol_l & 0x1f) \| mute);
	wm8739_write(sd, R1, (vol_r & 0x1f) \| mute);
	return 0;
	}

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

	static int wm8739_s_clock_freq(struct v4l2_subdev *sd, u32 audiofreq)
	{
	struct wm8739_state *state = to_state(sd);

	state->clock_freq = audiofreq;
	/* de-activate */
	wm8739_write(sd, R9, 0x000);
	switch (audiofreq) {
	case 44100:
	/* 256fps, fs=44.1k */
	wm8739_write(sd, R8, 0x020);
	break;
	case 48000:
	/* 256fps, fs=48k */
	wm8739_write(sd, R8, 0x000);
	break;
	case 32000:
	/* 256fps, fs=32k */
	wm8739_write(sd, R8, 0x018);
	break;
	default:
	break;
	}
	/* activate */
	wm8739_write(sd, R9, 0x001);
	return 0;
	}

	static int wm8739_log_status(struct v4l2_subdev *sd)
	{
	struct wm8739_state *state = to_state(sd);

	v4l2_info(sd, "Frequency: %u Hz\n", state->clock_freq);
	v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
	return 0;
	}

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

	static const struct v4l2_ctrl_ops wm8739_ctrl_ops = {
	.s_ctrl = wm8739_s_ctrl,
	};

	static const struct v4l2_subdev_core_ops wm8739_core_ops = {
	.log_status = wm8739_log_status,
	};

	static const struct v4l2_subdev_audio_ops wm8739_audio_ops = {
	.s_clock_freq = wm8739_s_clock_freq,
	};

	static const struct v4l2_subdev_ops wm8739_ops = {
	.core = &wm8739_core_ops,
	.audio = &wm8739_audio_ops,
	};

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

	/* i2c implementation */

	static int wm8739_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct wm8739_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, &wm8739_ops);
	v4l2_ctrl_handler_init(&state->hdl, 2);
	state->volume = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
	V4L2_CID_AUDIO_VOLUME, 0, 65535, 65535 / 100, 50736);
	state->mute = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
	V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
	state->balance = v4l2_ctrl_new_std(&state->hdl, &wm8739_ctrl_ops,
	V4L2_CID_AUDIO_BALANCE, 0, 65535, 65535 / 100, 32768);
	sd->ctrl_handler = &state->hdl;
	if (state->hdl.error) {
	int err = state->hdl.error;

	v4l2_ctrl_handler_free(&state->hdl);
	return err;
	}
	v4l2_ctrl_cluster(3, &state->volume);

	state->clock_freq = 48000;

	/* Initialize wm8739 */

	/* reset */
	wm8739_write(sd, R15, 0x00);
	/* filter setting, high path, offet clear */
	wm8739_write(sd, R5, 0x000);
	/* ADC, OSC, Power Off mode Disable */
	wm8739_write(sd, R6, 0x000);
	/* Digital Audio interface format:
	Enable Master mode, 24 bit, MSB first/left justified */
	wm8739_write(sd, R7, 0x049);
	/* sampling control: normal, 256fs, 48KHz sampling rate */
	wm8739_write(sd, R8, 0x000);
	/* activate */
	wm8739_write(sd, R9, 0x001);
	/* set volume/mute */
	v4l2_ctrl_handler_setup(&state->hdl);
	return 0;
	}

	static int wm8739_remove(struct i2c_client *client)
	{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	struct wm8739_state *state = to_state(sd);

	v4l2_device_unregister_subdev(sd);
	v4l2_ctrl_handler_free(&state->hdl);
	return 0;
	}

	static const struct i2c_device_id wm8739_id[] = {
	{ "wm8739", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, wm8739_id);

	static struct i2c_driver wm8739_driver = {
	.driver = {
	.name = "wm8739",
	},
	.probe = wm8739_probe,
	.remove = wm8739_remove,
	.id_table = wm8739_id,
	};

	module_i2c_driver(wm8739_driver);