drivers/media/video/wm8739.c - maze/linux - 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/ioctl.h>
 #include <asm/uaccess.h>
 #include <linux/i2c.h>
 #include <linux/i2c-id.h>
 #include <linux/videodev.h>
 #include <media/v4l2-common.h>
 #include <media/v4l2-chip-ident.h>
 #include <media/v4l2-i2c-drv.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 {
 	u32 clock_freq;
 	u8 muted;
 	u16 volume;
 	u16 balance;
 	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 */
 };

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

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

 	if (reg < 0 || reg >= TOT_REGS) {
 		v4l_err(client, "Invalid register R%d\n", reg);
 		return -1;
 	}

 	v4l_dbg(1, debug, client, "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;
 	v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
 	return -1;
 }

 /* write regs to set audio volume etc */
 static void wm8739_set_audio(struct i2c_client *client)
 {
 	struct wm8739_state *state = i2c_get_clientdata(client);
 	u16 mute = state->muted ? 0x80 : 0;

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

 static int wm8739_get_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 {
 	struct wm8739_state *state = i2c_get_clientdata(client);

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		ctrl->value = state->muted;
 		break;

 	case V4L2_CID_AUDIO_VOLUME:
 		ctrl->value = state->volume;
 		break;

 	case V4L2_CID_AUDIO_BALANCE:
 		ctrl->value = state->balance;
 		break;

 	default:
 		return -EINVAL;
 	}
 	return 0;
 }

 static int wm8739_set_ctrl(struct i2c_client *client, struct v4l2_control *ctrl)
 {
 	struct wm8739_state *state = i2c_get_clientdata(client);
 	unsigned int work_l, work_r;

 	switch (ctrl->id) {
 	case V4L2_CID_AUDIO_MUTE:
 		state->muted = ctrl->value;
 		break;

 	case V4L2_CID_AUDIO_VOLUME:
 		state->volume = ctrl->value;
 		break;

 	case V4L2_CID_AUDIO_BALANCE:
 		state->balance = ctrl->value;
 		break;

 	default:
 		return -EINVAL;
 	}

 	/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
 	work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
 	work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;

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

 	/* set audio volume etc. */
 	wm8739_set_audio(client);
 	return 0;
 }

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

 static struct v4l2_queryctrl wm8739_qctrl[] = {
 	{
 		.id            = V4L2_CID_AUDIO_VOLUME,
 		.name          = "Volume",
 		.minimum       = 0,
 		.maximum       = 65535,
 		.step          = 65535/100,
 		.default_value = 58880,
 		.flags         = 0,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	}, {
 		.id            = V4L2_CID_AUDIO_MUTE,
 		.name          = "Mute",
 		.minimum       = 0,
 		.maximum       = 1,
 		.step          = 1,
 		.default_value = 1,
 		.flags         = 0,
 		.type          = V4L2_CTRL_TYPE_BOOLEAN,
 	}, {
 		.id            = V4L2_CID_AUDIO_BALANCE,
 		.name          = "Balance",
 		.minimum       = 0,
 		.maximum       = 65535,
 		.step          = 65535/100,
 		.default_value = 32768,
 		.flags         = 0,
 		.type          = V4L2_CTRL_TYPE_INTEGER,
 	}
 };

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

 static int wm8739_command(struct i2c_client *client, unsigned cmd, void *arg)
 {
 	struct wm8739_state *state = i2c_get_clientdata(client);

 	switch (cmd) {
 	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
 	{
 		u32 audiofreq = *(u32 *)arg;

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

 	case VIDIOC_G_CTRL:
 		return wm8739_get_ctrl(client, arg);

 	case VIDIOC_S_CTRL:
 		return wm8739_set_ctrl(client, arg);

 	case VIDIOC_QUERYCTRL:
 	{
 		struct v4l2_queryctrl *qc = arg;
 		int i;

 		for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
 			if (qc->id && qc->id == wm8739_qctrl[i].id) {
 				memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
 				return 0;
 			}
 		return -EINVAL;
 	}

 	case VIDIOC_G_CHIP_IDENT:
 		return v4l2_chip_ident_i2c_client(client,
 				arg, V4L2_IDENT_WM8739, 0);

 	case VIDIOC_LOG_STATUS:
 		v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
 		v4l_info(client, "Volume L:  %02x%s\n", state->vol_l & 0x1f,
 				state->muted ? " (muted)" : "");
 		v4l_info(client, "Volume R:  %02x%s\n", state->vol_r & 0x1f,
 				state->muted ? " (muted)" : "");
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

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

 /* i2c implementation */

 static int wm8739_probe(struct i2c_client *client,
 			const struct i2c_device_id *id)
 {
 	struct wm8739_state *state;

 	/* 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 = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
 	if (state == NULL) {
 		kfree(client);
 		return -ENOMEM;
 	}
 	state->vol_l = 0x17; /* 0dB */
 	state->vol_r = 0x17; /* 0dB */
 	state->muted = 0;
 	state->balance = 32768;
 	/* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
 	state->volume = ((long)state->vol_l + 1) * 65535 / 31;
 	state->clock_freq = 48000;
 	i2c_set_clientdata(client, state);

 	/* Initialize wm8739 */

 	/* reset */
 	wm8739_write(client, R15, 0x00);
 	/* filter setting, high path, offet clear */
 	wm8739_write(client, R5, 0x000);
 	/* ADC, OSC, Power Off mode Disable */
 	wm8739_write(client, R6, 0x000);
 	/* Digital Audio interface format:
 	   Enable Master mode, 24 bit, MSB first/left justified */
 	wm8739_write(client, R7, 0x049);
 	/* sampling control: normal, 256fs, 48KHz sampling rate */
 	wm8739_write(client, R8, 0x000);
 	/* activate */
 	wm8739_write(client, R9, 0x001);
 	/* set volume/mute */
 	wm8739_set_audio(client);
 	return 0;
 }

 static int wm8739_remove(struct i2c_client *client)
 {
 	kfree(i2c_get_clientdata(client));
 	return 0;
 }

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

 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 	.name = "wm8739",
 	.driverid = I2C_DRIVERID_WM8739,
 	.command = wm8739_command,
 	.probe = wm8739_probe,
 	.remove = wm8739_remove,
 	.id_table = wm8739_id,
 };
	/*
	* 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/ioctl.h>
	#include <asm/uaccess.h>
	#include <linux/i2c.h>
	#include <linux/i2c-id.h>
	#include <linux/videodev.h>
	#include <media/v4l2-common.h>
	#include <media/v4l2-chip-ident.h>
	#include <media/v4l2-i2c-drv.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 {
	u32 clock_freq;
	u8 muted;
	u16 volume;
	u16 balance;
	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 */
	};

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

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

	if (reg < 0 \|\| reg >= TOT_REGS) {
	v4l_err(client, "Invalid register R%d\n", reg);
	return -1;
	}

	v4l_dbg(1, debug, client, "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;
	v4l_err(client, "I2C: cannot write %03x to register R%d\n", val, reg);
	return -1;
	}

	/* write regs to set audio volume etc */
	static void wm8739_set_audio(struct i2c_client *client)
	{
	struct wm8739_state *state = i2c_get_clientdata(client);
	u16 mute = state->muted ? 0x80 : 0;

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

	static int wm8739_get_ctrl(struct i2c_client client, struct v4l2_control ctrl)
	{
	struct wm8739_state *state = i2c_get_clientdata(client);

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	ctrl->value = state->muted;
	break;

	case V4L2_CID_AUDIO_VOLUME:
	ctrl->value = state->volume;
	break;

	case V4L2_CID_AUDIO_BALANCE:
	ctrl->value = state->balance;
	break;

	default:
	return -EINVAL;
	}
	return 0;
	}

	static int wm8739_set_ctrl(struct i2c_client client, struct v4l2_control ctrl)
	{
	struct wm8739_state *state = i2c_get_clientdata(client);
	unsigned int work_l, work_r;

	switch (ctrl->id) {
	case V4L2_CID_AUDIO_MUTE:
	state->muted = ctrl->value;
	break;

	case V4L2_CID_AUDIO_VOLUME:
	state->volume = ctrl->value;
	break;

	case V4L2_CID_AUDIO_BALANCE:
	state->balance = ctrl->value;
	break;

	default:
	return -EINVAL;
	}

	/* normalize ( 65535 to 0 -> 31 to 0 (12dB to -34.5dB) ) */
	work_l = (min(65536 - state->balance, 32768) * state->volume) / 32768;
	work_r = (min(state->balance, (u16)32768) * state->volume) / 32768;

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

	/* set audio volume etc. */
	wm8739_set_audio(client);
	return 0;
	}

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

	static struct v4l2_queryctrl wm8739_qctrl[] = {
	{
	.id = V4L2_CID_AUDIO_VOLUME,
	.name = "Volume",
	.minimum = 0,
	.maximum = 65535,
	.step = 65535/100,
	.default_value = 58880,
	.flags = 0,
	.type = V4L2_CTRL_TYPE_INTEGER,
	}, {
	.id = V4L2_CID_AUDIO_MUTE,
	.name = "Mute",
	.minimum = 0,
	.maximum = 1,
	.step = 1,
	.default_value = 1,
	.flags = 0,
	.type = V4L2_CTRL_TYPE_BOOLEAN,
	}, {
	.id = V4L2_CID_AUDIO_BALANCE,
	.name = "Balance",
	.minimum = 0,
	.maximum = 65535,
	.step = 65535/100,
	.default_value = 32768,
	.flags = 0,
	.type = V4L2_CTRL_TYPE_INTEGER,
	}
	};

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

	static int wm8739_command(struct i2c_client client, unsigned cmd, void arg)
	{
	struct wm8739_state *state = i2c_get_clientdata(client);

	switch (cmd) {
	case VIDIOC_INT_AUDIO_CLOCK_FREQ:
	{
	u32 audiofreq = (u32 )arg;

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

	case VIDIOC_G_CTRL:
	return wm8739_get_ctrl(client, arg);

	case VIDIOC_S_CTRL:
	return wm8739_set_ctrl(client, arg);

	case VIDIOC_QUERYCTRL:
	{
	struct v4l2_queryctrl *qc = arg;
	int i;

	for (i = 0; i < ARRAY_SIZE(wm8739_qctrl); i++)
	if (qc->id && qc->id == wm8739_qctrl[i].id) {
	memcpy(qc, &wm8739_qctrl[i], sizeof(*qc));
	return 0;
	}
	return -EINVAL;
	}

	case VIDIOC_G_CHIP_IDENT:
	return v4l2_chip_ident_i2c_client(client,
	arg, V4L2_IDENT_WM8739, 0);

	case VIDIOC_LOG_STATUS:
	v4l_info(client, "Frequency: %u Hz\n", state->clock_freq);
	v4l_info(client, "Volume L: %02x%s\n", state->vol_l & 0x1f,
	state->muted ? " (muted)" : "");
	v4l_info(client, "Volume R: %02x%s\n", state->vol_r & 0x1f,
	state->muted ? " (muted)" : "");
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

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

	/* i2c implementation */

	static int wm8739_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct wm8739_state *state;

	/* 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 = kmalloc(sizeof(struct wm8739_state), GFP_KERNEL);
	if (state == NULL) {
	kfree(client);
	return -ENOMEM;
	}
	state->vol_l = 0x17; /* 0dB */
	state->vol_r = 0x17; /* 0dB */
	state->muted = 0;
	state->balance = 32768;
	/* normalize (12dB(31) to -34.5dB(0) [0dB(23)] -> 65535 to 0) */
	state->volume = ((long)state->vol_l + 1) * 65535 / 31;
	state->clock_freq = 48000;
	i2c_set_clientdata(client, state);

	/* Initialize wm8739 */

	/* reset */
	wm8739_write(client, R15, 0x00);
	/* filter setting, high path, offet clear */
	wm8739_write(client, R5, 0x000);
	/* ADC, OSC, Power Off mode Disable */
	wm8739_write(client, R6, 0x000);
	/* Digital Audio interface format:
	Enable Master mode, 24 bit, MSB first/left justified */
	wm8739_write(client, R7, 0x049);
	/* sampling control: normal, 256fs, 48KHz sampling rate */
	wm8739_write(client, R8, 0x000);
	/* activate */
	wm8739_write(client, R9, 0x001);
	/* set volume/mute */
	wm8739_set_audio(client);
	return 0;
	}

	static int wm8739_remove(struct i2c_client *client)
	{
	kfree(i2c_get_clientdata(client));
	return 0;
	}

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

	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "wm8739",
	.driverid = I2C_DRIVERID_WM8739,
	.command = wm8739_command,
	.probe = wm8739_probe,
	.remove = wm8739_remove,
	.id_table = wm8739_id,
	};