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Commit 75c4570c authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
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V4L/DVB (3661): Add wm8739 stereo audio ADC i2c driver 



Add support for the Wolfson Microelectronics WM8739
stereo A/D converter from the ivtv driver.
Many thanks to Takahiro Adachi for writing the original driver.

Signed-off-by: default avatarTakahiro Adachi <tadachi@tadachi-net.com>
Signed-off-by: default avatarHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 953a676c

drivers/media/video/Kconfig

+13 −3
Original line number Diff line number Diff line
@@ -343,15 +343,25 @@ config VIDEO_CS53L32A 
	  module will be called cs53l32a



config VIDEO_WM8775

	tristate "Wolfson Microelectronics WM8775 audio ADC"

	tristate "Wolfson Microelectronics WM8775 audio ADC with input mixer"

	depends on VIDEO_DEV && I2C && EXPERIMENTAL

	---help---

	  Support for the Wolfson Microelectronics WM8775

	  high performance stereo A/D Converter.

	  Support for the Wolfson Microelectronics WM8775 high

	  performance stereo A/D Converter with a 4 channel input mixer.



	  To compile this driver as a module, choose M here: the

	  module will be called wm8775



config VIDEO_WM8739

	tristate "Wolfson Microelectronics WM8739 stereo audio ADC"

	depends on VIDEO_DEV && I2C && EXPERIMENTAL

	---help---

	  Support for the Wolfson Microelectronics WM8739

	  stereo A/D Converter.



	  To compile this driver as a module, choose M here: the

	  module will be called wm8739



source "drivers/media/video/cx25840/Kconfig"



config VIDEO_SAA711X

drivers/media/video/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ obj-$(CONFIG_VIDEO_EM28XX) += tvp5150.o 
obj-$(CONFIG_VIDEO_MSP3400) += msp3400.o

obj-$(CONFIG_VIDEO_CS53L32A) += cs53l32a.o

obj-$(CONFIG_VIDEO_WM8775) += wm8775.o

obj-$(CONFIG_VIDEO_WM8739) += wm8739.o

obj-$(CONFIG_VIDEO_OVCAMCHIP) += ovcamchip/

obj-$(CONFIG_VIDEO_CPIA2) += cpia2/

obj-$(CONFIG_VIDEO_MXB) += saa7111.o tda9840.o tea6415c.o tea6420.o mxb.o

drivers/media/video/wm8739.c

0 → 100644
+355 −0
Original line number Diff line number Diff line 
/*

 * 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>



MODULE_DESCRIPTION("wm8739 driver");

MODULE_AUTHOR("T. Adachi, Hans Verkuil");

MODULE_LICENSE("GPL");



static int debug = 0;

static unsigned short normal_i2c[] = { 0x34 >> 1, 0x36 >> 1, I2C_CLIENT_END };



module_param(debug, int, 0644);



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





I2C_CLIENT_INSMOD;



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



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 int 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;

		wm8739_write(client, R9, 0x000);	/* de-activate */

		switch (audiofreq) {

		case 44100:

			wm8739_write(client, R8, 0x020); /* 256fps, fs=44.1k     */

			break;

		case 48000:

			wm8739_write(client, R8, 0x000); /* 256fps, fs=48k       */

			break;

		case 32000:

			wm8739_write(client, R8, 0x018); /* 256fps, fs=32k       */

			break;

		default:

			break;

		}

		wm8739_write(client, R9, 0x001);	/* activate */

		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_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 struct i2c_driver i2c_driver;



static int wm8739_attach(struct i2c_adapter *adapter, int address, int kind)

{

	struct i2c_client *client;

	struct wm8739_state *state;



	/* Check if the adapter supports the needed features */

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return 0;



	client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);

	if (client == NULL)

		return -ENOMEM;



	client->addr = address;

	client->adapter = adapter;

	client->driver = &i2c_driver;

	snprintf(client->name, sizeof(client->name) - 1, "wm8739");



	v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, 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 */

	wm8739_write(client, R15, 0x00); /* reset */

	wm8739_write(client, R5, 0x000); /* filter setting, high path, offet clear */

	wm8739_write(client, R6, 0x000); /* ADC, OSC, Power Off mode Disable */

	wm8739_write(client, R7, 0x049); /* Digital Audio interface format */

					 /* Enable Master mode */

					 /* 24 bit, MSB first/left justified */

	wm8739_write(client, R8, 0x000); /* sampling control */

					 /* normal, 256fs, 48KHz sampling rate */

	wm8739_write(client, R9, 0x001); /* activate */

	wm8739_set_audio(client); 	 /* set volume/mute */



	i2c_attach_client(client);



	return 0;

}



static int wm8739_probe(struct i2c_adapter *adapter)

{

	if (adapter->class & I2C_CLASS_TV_ANALOG)

		return i2c_probe(adapter, &addr_data, wm8739_attach);

	return 0;

}



static int wm8739_detach(struct i2c_client *client)

{

	int err;



	err = i2c_detach_client(client);

	if (err)

		return err;



	kfree(client);

	return 0;

}



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



/* i2c implementation */

static struct i2c_driver i2c_driver = {

	.driver = {

		.name = "wm8739",

	},

	.id = I2C_DRIVERID_WM8739,

	.attach_adapter = wm8739_probe,

	.detach_client  = wm8739_detach,

	.command = wm8739_command,

};





static int __init wm8739_init_module(void)

{

	return i2c_add_driver(&i2c_driver);

}



static void __exit wm8739_cleanup_module(void)

{

	i2c_del_driver(&i2c_driver);

}



module_init(wm8739_init_module);

module_exit(wm8739_cleanup_module);