[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/videodev.h>
#include <media/m52790.h>
#include <media/v4l2-common.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 {
	u16 input;
	u16 output;
};

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

static int m52790_write(struct i2c_client *client)
{
	struct m52790_state *state = i2c_get_clientdata(client);
	u8 sw1 = (state->input | state->output) & 0xff;
	u8 sw2 = (state->input | state->output) >> 8;

	return i2c_smbus_write_byte_data(client, sw1, sw2);
}

static int m52790_command(struct i2c_client *client, unsigned int cmd,
			    void *arg)
{
	struct m52790_state *state = i2c_get_clientdata(client);
	struct v4l2_routing *route = arg;

	/* 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. */
	switch (cmd) {
	case VIDIOC_INT_G_AUDIO_ROUTING:
	case VIDIOC_INT_G_VIDEO_ROUTING:
		route->input = state->input;
		route->output = state->output;
		break;

	case VIDIOC_INT_S_AUDIO_ROUTING:
	case VIDIOC_INT_S_VIDEO_ROUTING:
		state->input = route->input;
		state->output = route->output;
		m52790_write(client);
		break;

#ifdef CONFIG_VIDEO_ADV_DEBUG
	case VIDIOC_DBG_G_REGISTER:
	case VIDIOC_DBG_S_REGISTER:
	{
		struct v4l2_register *reg = arg;

		if (!v4l2_chip_match_i2c_client(client,
					reg->match_type, reg->match_chip))
			return -EINVAL;
		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		if (reg->reg != 0)
			return -EINVAL;
		if (cmd == VIDIOC_DBG_G_REGISTER)
			reg->val = state->input | state->output;
		else {
			state->input = reg->val & 0x0303;
			state->output = reg->val & ~0x0303;
			m52790_write(client);
		}
		break;
	}
#endif

	case VIDIOC_G_CHIP_IDENT:
		return v4l2_chip_ident_i2c_client(client, arg,
				V4L2_IDENT_M52790, 0);

	case VIDIOC_LOG_STATUS:
		v4l_info(client, "Switch 1: %02x\n",
				(state->input | state->output) & 0xff);
		v4l_info(client, "Switch 2: %02x\n",
				(state->input | state->output) >> 8);
		break;

	default:
		return -EINVAL;
	}
	return 0;
}

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

/* i2c implementation */

static int m52790_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct m52790_state *state;

	/* Check if the adapter supports the needed features */
	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -EIO;

	snprintf(client->name, sizeof(client->name) - 1, "m52790");

	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;

	state->input = M52790_IN_TUNER;
	state->output = M52790_OUT_STEREO;
	i2c_set_clientdata(client, state);
	m52790_write(client);
	return 0;
}

static int m52790_remove(struct i2c_client *client)
{
	kfree(i2c_get_clientdata(client));
	return 0;
}

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

static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	.name = "m52790",
	.driverid = I2C_DRIVERID_M52790,
	.command = m52790_command,
	.probe = m52790_probe,
	.remove = m52790_remove,
};
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>
	29	#include <linux/videodev.h>
	30	#include <media/m52790.h>
	31	#include <media/v4l2-common.h>
	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
	40	struct m52790_state {
	41	u16 input;
	42	u16 output;
	43	};
	44
	45	/* ----------------------------------------------------------------------- */
	46
	47	static int m52790_write(struct i2c_client *client)
	48	{
	49	struct m52790_state *state = i2c_get_clientdata(client);
	50	u8 sw1 = (state->input \| state->output) & 0xff;
	51	u8 sw2 = (state->input \| state->output) >> 8;
	52
	53	return i2c_smbus_write_byte_data(client, sw1, sw2);
	54	}
	55
	56	static int m52790_command(struct i2c_client *client, unsigned int cmd,
	57	void *arg)
	58	{
	59	struct m52790_state *state = i2c_get_clientdata(client);
	60	struct v4l2_routing *route = arg;
	61
	62	/* Note: audio and video are linked and cannot be switched separately.
	63	So audio and video routing commands are identical for this chip.
	64	In theory the video amplifier and audio modes could be handled
	65	separately for the output, but that seems to be overkill right now.
	66	The same holds for implementing an audio mute control, this is now
	67	part of the audio output routing. The normal case is that another
	68	chip takes care of the actual muting so making it part of the
	69	output routing seems to be the right thing to do for now. */
	70	switch (cmd) {
	71	case VIDIOC_INT_G_AUDIO_ROUTING:
	72	case VIDIOC_INT_G_VIDEO_ROUTING:
	73	route->input = state->input;
	74	route->output = state->output;
	75	break;
	76
	77	case VIDIOC_INT_S_AUDIO_ROUTING:
	78	case VIDIOC_INT_S_VIDEO_ROUTING:
	79	state->input = route->input;
	80	state->output = route->output;
	81	m52790_write(client);
	82	break;
	83
	84	#ifdef CONFIG_VIDEO_ADV_DEBUG
	85	case VIDIOC_DBG_G_REGISTER:
	86	case VIDIOC_DBG_S_REGISTER:
	87	{
	88	struct v4l2_register *reg = arg;
	89
	90	if (!v4l2_chip_match_i2c_client(client,
	91	reg->match_type, reg->match_chip))
	92	return -EINVAL;
	93	if (!capable(CAP_SYS_ADMIN))
	94	return -EPERM;
	95	if (reg->reg != 0)
	96	return -EINVAL;
	97	if (cmd == VIDIOC_DBG_G_REGISTER)
	98	reg->val = state->input \| state->output;
	99	else {
	100	state->input = reg->val & 0x0303;
	101	state->output = reg->val & ~0x0303;
	102	m52790_write(client);
103	}
104	break;
105	}
106	#endif
107
108	case VIDIOC_G_CHIP_IDENT:
109	return v4l2_chip_ident_i2c_client(client, arg,
110	V4L2_IDENT_M52790, 0);
111
112	case VIDIOC_LOG_STATUS:
113	v4l_info(client, "Switch 1: %02x\n",
114	(state->input \| state->output) & 0xff);
115	v4l_info(client, "Switch 2: %02x\n",
116	(state->input \| state->output) >> 8);
117	break;
118
119	default:
120	return -EINVAL;
121	}
122	return 0;
123	}
124
125	/* ----------------------------------------------------------------------- */
126
127	/* i2c implementation */
128
d2653e92 JD	129	static int m52790_probe(struct i2c_client *client,
d2653e92 JD	130	const struct i2c_device_id *id)
761dacd2 HV	131	{
	132	struct m52790_state *state;
	133
	134	/* Check if the adapter supports the needed features */
	135	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	136	return -EIO;
	137
	138	snprintf(client->name, sizeof(client->name) - 1, "m52790");
	139
	140	v4l_info(client, "chip found @ 0x%x (%s)\n",
	141	client->addr << 1, client->adapter->name);
	142
	143	state = kmalloc(sizeof(struct m52790_state), GFP_KERNEL);
	144	if (state == NULL)
	145	return -ENOMEM;
	146
	147	state->input = M52790_IN_TUNER;
	148	state->output = M52790_OUT_STEREO;
	149	i2c_set_clientdata(client, state);
	150	m52790_write(client);
	151	return 0;
	152	}
	153
	154	static int m52790_remove(struct i2c_client *client)
	155	{
	156	kfree(i2c_get_clientdata(client));
	157	return 0;
	158	}
	159
	160	/* ----------------------------------------------------------------------- */
	161
	162	static struct v4l2_i2c_driver_data v4l2_i2c_data = {
	163	.name = "m52790",
	164	.driverid = I2C_DRIVERID_M52790,
	165	.command = m52790_command,
	166	.probe = m52790_probe,
	167	.remove = m52790_remove,
	168	};
	169