[deliverable/linux.git] / drivers / media / video / m52790.c

/*
 * m52790 i2c ivtv driver.
 * Copyright (C) 2007  Hans Verkuil
 *
 * A/V source switching Mitsubishi M52790SP/FP
 *
 * 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/videodev2.h>
#include <media/m52790.h>
#include <media/v4l2-device.h>
#include <media/v4l2-chip-ident.h>
#include <media/v4l2-i2c-drv.h>

MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
MODULE_AUTHOR("Hans Verkuil");
MODULE_LICENSE("GPL");


struct m52790_state {
	struct v4l2_subdev sd;
	u16 input;
	u16 output;
};

static inline struct m52790_state *to_state(struct v4l2_subdev *sd)
{
	return container_of(sd, struct m52790_state, sd);
}

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

static int m52790_write(struct v4l2_subdev *sd)
{
	struct m52790_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	u8 sw1 = (state->input | state->output) & 0xff;
	u8 sw2 = (state->input | state->output) >> 8;

	return i2c_smbus_write_byte_data(client, sw1, sw2);
}

/* Note: audio and video are linked and cannot be switched separately.
   So audio and video routing commands are identical for this chip.
   In theory the video amplifier and audio modes could be handled
   separately for the output, but that seems to be overkill right now.
   The same holds for implementing an audio mute control, this is now
   part of the audio output routing. The normal case is that another
   chip takes care of the actual muting so making it part of the
   output routing seems to be the right thing to do for now. */
static int m52790_s_routing(struct v4l2_subdev *sd, const struct v4l2_routing *route)
{
	struct m52790_state *state = to_state(sd);

	state->input = route->input;
	state->output = route->output;
	m52790_write(sd);
	return 0;
}

#ifdef CONFIG_VIDEO_ADV_DEBUG
static int m52790_g_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
	struct m52790_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (!v4l2_chip_match_i2c_client(client, &reg->match))
		return -EINVAL;
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (reg->reg != 0)
		return -EINVAL;
	reg->size = 1;
	reg->val = state->input | state->output;
	return 0;
}

static int m52790_s_register(struct v4l2_subdev *sd, struct v4l2_dbg_register *reg)
{
	struct m52790_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	if (!v4l2_chip_match_i2c_client(client, &reg->match))
		return -EINVAL;
	if (!capable(CAP_SYS_ADMIN))
		return -EPERM;
	if (reg->reg != 0)
		return -EINVAL;
	state->input = reg->val & 0x0303;
	state->output = reg->val & ~0x0303;
	m52790_write(sd);
	return 0;
}
#endif

static int m52790_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
{
	struct i2c_client *client = v4l2_get_subdevdata(sd);

	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0);
}

static int m52790_log_status(struct v4l2_subdev *sd)
{
	struct m52790_state *state = to_state(sd);

	v4l2_info(sd, "Switch 1: %02x\n",
			(state->input | state->output) & 0xff);
	v4l2_info(sd, "Switch 2: %02x\n",
			(state->input | state->output) >> 8);
	return 0;
}

static int m52790_command(struct i2c_client *client, unsigned cmd, void *arg)
{
	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
}

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

static const struct v4l2_subdev_core_ops m52790_core_ops = {
	.log_status = m52790_log_status,
	.g_chip_ident = m52790_g_chip_ident,
#ifdef CONFIG_VIDEO_ADV_DEBUG
	.g_register = m52790_g_register,
	.s_register = m52790_s_register,
#endif
};

static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
	.s_routing = m52790_s_routing,
};

static const struct v4l2_subdev_video_ops m52790_video_ops = {
	.s_routing = m52790_s_routing,
};

static const struct v4l2_subdev_ops m52790_ops = {
	.core = &m52790_core_ops,
	.audio = &m52790_audio_ops,
	.video = &m52790_video_ops,
};

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

/* i2c implementation */

static int m52790_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct m52790_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 = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
	if (state == NULL)
		return -ENOMEM;

	sd = &state->sd;
	v4l2_i2c_subdev_init(sd, client, &m52790_ops);
	state->input = M52790_IN_TUNER;
	state->output = M52790_OUT_STEREO;
	m52790_write(sd);
	return 0;
}

static int m52790_remove(struct i2c_client *client)
{
	struct v4l2_subdev *sd = i2c_get_clientdata(client);

	v4l2_device_unregister_subdev(sd);
	kfree(to_state(sd));
	return 0;
}

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

static const struct i2c_device_id m52790_id[] = {
	{ "m52790", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, m52790_id);

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "m52790",
	.driverid = I2C_DRIVERID_M52790,
	.command = m52790_command,
	.probe = m52790_probe,
	.remove = m52790_remove,
	.id_table = m52790_id,
};
Commit	Line	Data
761dacd2 HV	1	/*
	2	* m52790 i2c ivtv driver.
	3	* Copyright (C) 2007 Hans Verkuil
	4	*
	5	* A/V source switching Mitsubishi M52790SP/FP
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
	21
	22
	23	#include <linux/module.h>
	24	#include <linux/types.h>
	25	#include <linux/ioctl.h>
	26	#include <asm/uaccess.h>
	27	#include <linux/i2c.h>
	28	#include <linux/i2c-id.h>
33b687cf	29	#include <linux/videodev2.h>
761dacd2	30	#include <media/m52790.h>
5d302f2e	31	#include <media/v4l2-device.h>
761dacd2	32	#include <media/v4l2-chip-ident.h>
f69d419a	33	#include <media/v4l2-i2c-drv.h>
761dacd2 HV	34
	35	MODULE_DESCRIPTION("i2c device driver for m52790 A/V switch");
	36	MODULE_AUTHOR("Hans Verkuil");
	37	MODULE_LICENSE("GPL");
	38
761dacd2 HV	39
761dacd2 HV	40	struct m52790_state {
5d302f2e	41	struct v4l2_subdev sd;
761dacd2 HV	42	u16 input;
	43	u16 output;
	44	};
	45
5d302f2e HV	46	static inline struct m52790_state to_state(struct v4l2_subdev sd)
	47	{
	48	return container_of(sd, struct m52790_state, sd);
	49	}
	50
761dacd2 HV	51	/* ----------------------------------------------------------------------- */
761dacd2 HV	52
5d302f2e	53	static int m52790_write(struct v4l2_subdev *sd)
761dacd2	54	{
5d302f2e HV	55	struct m52790_state *state = to_state(sd);
	56	struct i2c_client *client = v4l2_get_subdevdata(sd);
	57
761dacd2 HV	58	u8 sw1 = (state->input \| state->output) & 0xff;
	59	u8 sw2 = (state->input \| state->output) >> 8;
	60
	61	return i2c_smbus_write_byte_data(client, sw1, sw2);
	62	}
	63
5d302f2e HV	64	/* Note: audio and video are linked and cannot be switched separately.
	65	So audio and video routing commands are identical for this chip.
	66	In theory the video amplifier and audio modes could be handled
	67	separately for the output, but that seems to be overkill right now.
	68	The same holds for implementing an audio mute control, this is now
	69	part of the audio output routing. The normal case is that another
	70	chip takes care of the actual muting so making it part of the
	71	output routing seems to be the right thing to do for now. */
	72	static int m52790_s_routing(struct v4l2_subdev sd, const struct v4l2_routing route)
761dacd2	73	{
5d302f2e HV	74	struct m52790_state *state = to_state(sd);
	75
	76	state->input = route->input;
	77	state->output = route->output;
	78	m52790_write(sd);
	79	return 0;
	80	}
761dacd2 HV	81
761dacd2 HV	82	#ifdef CONFIG_VIDEO_ADV_DEBUG
aecde8b5	83	static int m52790_g_register(struct v4l2_subdev sd, struct v4l2_dbg_register reg)
5d302f2e HV	84	{
	85	struct m52790_state *state = to_state(sd);
	86	struct i2c_client *client = v4l2_get_subdevdata(sd);
761dacd2	87
aecde8b5	88	if (!v4l2_chip_match_i2c_client(client, &reg->match))
5d302f2e HV	89	return -EINVAL;
	90	if (!capable(CAP_SYS_ADMIN))
	91	return -EPERM;
	92	if (reg->reg != 0)
	93	return -EINVAL;
aecde8b5	94	reg->size = 1;
5d302f2e HV	95	reg->val = state->input \| state->output;
	96	return 0;
	97	}
761dacd2	98
aecde8b5	99	static int m52790_s_register(struct v4l2_subdev sd, struct v4l2_dbg_register reg)
5d302f2e HV	100	{
	101	struct m52790_state *state = to_state(sd);
	102	struct i2c_client *client = v4l2_get_subdevdata(sd);
761dacd2	103
aecde8b5	104	if (!v4l2_chip_match_i2c_client(client, &reg->match))
761dacd2	105	return -EINVAL;
5d302f2e HV	106	if (!capable(CAP_SYS_ADMIN))
	107	return -EPERM;
	108	if (reg->reg != 0)
	109	return -EINVAL;
	110	state->input = reg->val & 0x0303;
	111	state->output = reg->val & ~0x0303;
	112	m52790_write(sd);
761dacd2 HV	113	return 0;
761dacd2 HV	114	}
5d302f2e HV	115	#endif
5d302f2e HV	116
aecde8b5	117	static int m52790_g_chip_ident(struct v4l2_subdev sd, struct v4l2_dbg_chip_ident chip)
5d302f2e HV	118	{
	119	struct i2c_client *client = v4l2_get_subdevdata(sd);
	120
	121	return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_M52790, 0);
	122	}
	123
	124	static int m52790_log_status(struct v4l2_subdev *sd)
	125	{
	126	struct m52790_state *state = to_state(sd);
	127
	128	v4l2_info(sd, "Switch 1: %02x\n",
	129	(state->input \| state->output) & 0xff);
	130	v4l2_info(sd, "Switch 2: %02x\n",
	131	(state->input \| state->output) >> 8);
	132	return 0;
	133	}
	134
	135	static int m52790_command(struct i2c_client client, unsigned cmd, void arg)
	136	{
	137	return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
	138	}
	139
	140	/* ----------------------------------------------------------------------- */
	141
	142	static const struct v4l2_subdev_core_ops m52790_core_ops = {
	143	.log_status = m52790_log_status,
	144	.g_chip_ident = m52790_g_chip_ident,
	145	#ifdef CONFIG_VIDEO_ADV_DEBUG
	146	.g_register = m52790_g_register,
	147	.s_register = m52790_s_register,
	148	#endif
	149	};
	150
	151	static const struct v4l2_subdev_audio_ops m52790_audio_ops = {
	152	.s_routing = m52790_s_routing,
	153	};
	154
	155	static const struct v4l2_subdev_video_ops m52790_video_ops = {
	156	.s_routing = m52790_s_routing,
	157	};
	158
	159	static const struct v4l2_subdev_ops m52790_ops = {
	160	.core = &m52790_core_ops,
	161	.audio = &m52790_audio_ops,
	162	.video = &m52790_video_ops,
	163	};
761dacd2 HV	164
	165	/* ----------------------------------------------------------------------- */
	166
	167	/* i2c implementation */
	168
d2653e92 JD	169	static int m52790_probe(struct i2c_client *client,
d2653e92 JD	170	const struct i2c_device_id *id)
761dacd2 HV	171	{
761dacd2 HV	172	struct m52790_state *state;
5d302f2e	173	struct v4l2_subdev *sd;
761dacd2 HV	174
	175	/* Check if the adapter supports the needed features */
	176	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	177	return -EIO;
	178
761dacd2 HV	179	v4l_info(client, "chip found @ 0x%x (%s)\n",
	180	client->addr << 1, client->adapter->name);
	181
	182	state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
	183	if (state == NULL)
	184	return -ENOMEM;
	185
5d302f2e HV	186	sd = &state->sd;
5d302f2e HV	187	v4l2_i2c_subdev_init(sd, client, &m52790_ops);
761dacd2 HV	188	state->input = M52790_IN_TUNER;
761dacd2 HV	189	state->output = M52790_OUT_STEREO;
5d302f2e	190	m52790_write(sd);
761dacd2 HV	191	return 0;
	192	}
	193
	194	static int m52790_remove(struct i2c_client *client)
	195	{
5d302f2e HV	196	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	197
	198	v4l2_device_unregister_subdev(sd);
	199	kfree(to_state(sd));
761dacd2 HV	200	return 0;
	201	}
	202
	203	/* ----------------------------------------------------------------------- */
	204
af294867 JD	205	static const struct i2c_device_id m52790_id[] = {
	206	{ "m52790", 0 },
	207	{ }
	208	};
	209	MODULE_DEVICE_TABLE(i2c, m52790_id);
	210
761dacd2 HV	211	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	212	.name = "m52790",
	213	.driverid = I2C_DRIVERID_M52790,
	214	.command = m52790_command,
	215	.probe = m52790_probe,
	216	.remove = m52790_remove,
af294867	217	.id_table = m52790_id,
761dacd2	218	};