[deliverable/linux.git] / drivers / media / radio / tef6862.c

/*
 * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
 * Copyright (c) 2009 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-device.h>

#define DRIVER_NAME "tef6862"

#define FREQ_MUL 16000

#define TEF6862_LO_FREQ (875U * FREQ_MUL / 10)
#define TEF6862_HI_FREQ (108U * FREQ_MUL)

/* Write mode sub addresses */
#define WM_SUB_BANDWIDTH	0x0
#define WM_SUB_PLLM		0x1
#define WM_SUB_PLLL		0x2
#define WM_SUB_DAA		0x3
#define WM_SUB_AGC		0x4
#define WM_SUB_BAND		0x5
#define WM_SUB_CONTROL		0x6
#define WM_SUB_LEVEL		0x7
#define WM_SUB_IFCF		0x8
#define WM_SUB_IFCAP		0x9
#define WM_SUB_ACD		0xA
#define WM_SUB_TEST		0xF

/* Different modes of the MSA register */
#define MSA_MODE_BUFFER		0x0
#define MSA_MODE_PRESET		0x1
#define MSA_MODE_SEARCH		0x2
#define MSA_MODE_AF_UPDATE	0x3
#define MSA_MODE_JUMP		0x4
#define MSA_MODE_CHECK		0x5
#define MSA_MODE_LOAD		0x6
#define MSA_MODE_END		0x7
#define MSA_MODE_SHIFT		5

struct tef6862_state {
	struct v4l2_subdev sd;
	unsigned long freq;
};

static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
{
	return container_of(sd, struct tef6862_state, sd);
}

static u16 tef6862_sigstr(struct i2c_client *client)
{
	u8 buf[4];
	int err = i2c_master_recv(client, buf, sizeof(buf));
	if (err == sizeof(buf))
		return buf[3] << 8;
	return 0;
}

static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
{
	if (v->index > 0)
		return -EINVAL;

	/* only support FM for now */
	strlcpy(v->name, "FM", sizeof(v->name));
	v->type = V4L2_TUNER_RADIO;
	v->rangelow = TEF6862_LO_FREQ;
	v->rangehigh = TEF6862_HI_FREQ;
	v->rxsubchans = V4L2_TUNER_SUB_MONO;
	v->capability = V4L2_TUNER_CAP_LOW;
	v->audmode = V4L2_TUNER_MODE_STEREO;
	v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));

	return 0;
}

static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v)
{
	return v->index ? -EINVAL : 0;
}

static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f)
{
	struct tef6862_state *state = to_state(sd);
	struct i2c_client *client = v4l2_get_subdevdata(sd);
	unsigned freq = f->frequency;
	u16 pll;
	u8 i2cmsg[3];
	int err;

	if (f->tuner != 0)
		return -EINVAL;

	freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ);
	pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
	i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM;
	i2cmsg[1] = (pll >> 8) & 0xff;
	i2cmsg[2] = pll & 0xff;

	err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
	if (err != sizeof(i2cmsg))
		return err < 0 ? err : -EIO;

	state->freq = freq;
	return 0;
}

static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
{
	struct tef6862_state *state = to_state(sd);

	if (f->tuner != 0)
		return -EINVAL;
	f->type = V4L2_TUNER_RADIO;
	f->frequency = state->freq;
	return 0;
}

static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
	.g_tuner = tef6862_g_tuner,
	.s_tuner = tef6862_s_tuner,
	.s_frequency = tef6862_s_frequency,
	.g_frequency = tef6862_g_frequency,
};

static const struct v4l2_subdev_ops tef6862_ops = {
	.tuner = &tef6862_tuner_ops,
};

/*
 * Generic i2c probe
 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 */

static int tef6862_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct tef6862_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%02x (%s)\n",
			client->addr << 1, client->adapter->name);

	state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
	if (state == NULL)
		return -ENOMEM;
	state->freq = TEF6862_LO_FREQ;

	sd = &state->sd;
	v4l2_i2c_subdev_init(sd, client, &tef6862_ops);

	return 0;
}

static int tef6862_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 tef6862_id[] = {
	{DRIVER_NAME, 0},
	{},
};

MODULE_DEVICE_TABLE(i2c, tef6862_id);

static struct i2c_driver tef6862_driver = {
	.driver = {
		.name	= DRIVER_NAME,
	},
	.probe		= tef6862_probe,
	.remove		= tef6862_remove,
	.id_table	= tef6862_id,
};

module_i2c_driver(tef6862_driver);

MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
MODULE_AUTHOR("Mocean Laboratories");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
eea85b0a RR	1	/*
	2	* tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
	3	* Copyright (c) 2009 Intel Corporation
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/errno.h>
	22	#include <linux/kernel.h>
	23	#include <linux/interrupt.h>
	24	#include <linux/i2c.h>
5a0e3ad6	25	#include <linux/slab.h>
eea85b0a RR	26	#include <media/v4l2-ioctl.h>
eea85b0a RR	27	#include <media/v4l2-device.h>
eea85b0a RR	28
	29	#define DRIVER_NAME "tef6862"
	30
	31	#define FREQ_MUL 16000
	32
fa915996 HV	33	#define TEF6862_LO_FREQ (875U * FREQ_MUL / 10)
fa915996 HV	34	#define TEF6862_HI_FREQ (108U * FREQ_MUL)
eea85b0a RR	35
	36	/* Write mode sub addresses */
	37	#define WM_SUB_BANDWIDTH 0x0
	38	#define WM_SUB_PLLM 0x1
	39	#define WM_SUB_PLLL 0x2
	40	#define WM_SUB_DAA 0x3
	41	#define WM_SUB_AGC 0x4
	42	#define WM_SUB_BAND 0x5
	43	#define WM_SUB_CONTROL 0x6
	44	#define WM_SUB_LEVEL 0x7
	45	#define WM_SUB_IFCF 0x8
	46	#define WM_SUB_IFCAP 0x9
	47	#define WM_SUB_ACD 0xA
	48	#define WM_SUB_TEST 0xF
	49
	50	/* Different modes of the MSA register */
5f27ca41 MCC	51	#define MSA_MODE_BUFFER 0x0
	52	#define MSA_MODE_PRESET 0x1
	53	#define MSA_MODE_SEARCH 0x2
	54	#define MSA_MODE_AF_UPDATE 0x3
	55	#define MSA_MODE_JUMP 0x4
	56	#define MSA_MODE_CHECK 0x5
	57	#define MSA_MODE_LOAD 0x6
	58	#define MSA_MODE_END 0x7
	59	#define MSA_MODE_SHIFT 5
eea85b0a RR	60
	61	struct tef6862_state {
	62	struct v4l2_subdev sd;
	63	unsigned long freq;
	64	};
	65
	66	static inline struct tef6862_state to_state(struct v4l2_subdev sd)
	67	{
	68	return container_of(sd, struct tef6862_state, sd);
	69	}
	70
	71	static u16 tef6862_sigstr(struct i2c_client *client)
	72	{
	73	u8 buf[4];
	74	int err = i2c_master_recv(client, buf, sizeof(buf));
	75	if (err == sizeof(buf))
	76	return buf[3] << 8;
	77	return 0;
	78	}
	79
	80	static int tef6862_g_tuner(struct v4l2_subdev sd, struct v4l2_tuner v)
	81	{
	82	if (v->index > 0)
	83	return -EINVAL;
	84
	85	/* only support FM for now */
	86	strlcpy(v->name, "FM", sizeof(v->name));
	87	v->type = V4L2_TUNER_RADIO;
	88	v->rangelow = TEF6862_LO_FREQ;
	89	v->rangehigh = TEF6862_HI_FREQ;
	90	v->rxsubchans = V4L2_TUNER_SUB_MONO;
	91	v->capability = V4L2_TUNER_CAP_LOW;
	92	v->audmode = V4L2_TUNER_MODE_STEREO;
	93	v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
	94
	95	return 0;
	96	}
	97
2f73c7c5	98	static int tef6862_s_tuner(struct v4l2_subdev sd, const struct v4l2_tuner v)
eea85b0a RR	99	{
	100	return v->index ? -EINVAL : 0;
	101	}
	102
b530a447	103	static int tef6862_s_frequency(struct v4l2_subdev sd, const struct v4l2_frequency f)
eea85b0a RR	104	{
	105	struct tef6862_state *state = to_state(sd);
	106	struct i2c_client *client = v4l2_get_subdevdata(sd);
fa915996	107	unsigned freq = f->frequency;
eea85b0a RR	108	u16 pll;
	109	u8 i2cmsg[3];
	110	int err;
	111
	112	if (f->tuner != 0)
	113	return -EINVAL;
	114
9ba6a91f	115	freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ);
fa915996	116	pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
5f27ca41	117	i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) \| WM_SUB_PLLM;
eea85b0a RR	118	i2cmsg[1] = (pll >> 8) & 0xff;
	119	i2cmsg[2] = pll & 0xff;
	120
	121	err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
bd93b3ad AL	122	if (err != sizeof(i2cmsg))
	123	return err < 0 ? err : -EIO;
	124
fa915996	125	state->freq = freq;
bd93b3ad	126	return 0;
eea85b0a RR	127	}
	128
	129	static int tef6862_g_frequency(struct v4l2_subdev sd, struct v4l2_frequency f)
	130	{
	131	struct tef6862_state *state = to_state(sd);
	132
	133	if (f->tuner != 0)
	134	return -EINVAL;
	135	f->type = V4L2_TUNER_RADIO;
	136	f->frequency = state->freq;
	137	return 0;
	138	}
	139
eea85b0a RR	140	static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
	141	.g_tuner = tef6862_g_tuner,
	142	.s_tuner = tef6862_s_tuner,
	143	.s_frequency = tef6862_s_frequency,
	144	.g_frequency = tef6862_g_frequency,
	145	};
	146
eea85b0a	147	static const struct v4l2_subdev_ops tef6862_ops = {
eea85b0a RR	148	.tuner = &tef6862_tuner_ops,
	149	};
	150
	151	/*
	152	* Generic i2c probe
	153	* concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
	154	*/
	155
4c62e976 GKH	156	static int tef6862_probe(struct i2c_client *client,
4c62e976 GKH	157	const struct i2c_device_id *id)
eea85b0a RR	158	{
	159	struct tef6862_state *state;
	160	struct v4l2_subdev *sd;
	161
	162	/* Check if the adapter supports the needed features */
	163	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	164	return -EIO;
	165
	166	v4l_info(client, "chip found @ 0x%02x (%s)\n",
	167	client->addr << 1, client->adapter->name);
	168
80845a33	169	state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
eea85b0a RR	170	if (state == NULL)
	171	return -ENOMEM;
	172	state->freq = TEF6862_LO_FREQ;
	173
	174	sd = &state->sd;
	175	v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
	176
	177	return 0;
	178	}
	179
4c62e976	180	static int tef6862_remove(struct i2c_client *client)
eea85b0a RR	181	{
	182	struct v4l2_subdev *sd = i2c_get_clientdata(client);
	183
	184	v4l2_device_unregister_subdev(sd);
	185	kfree(to_state(sd));
	186	return 0;
	187	}
	188
	189	static const struct i2c_device_id tef6862_id[] = {
	190	{DRIVER_NAME, 0},
	191	{},
	192	};
	193
	194	MODULE_DEVICE_TABLE(i2c, tef6862_id);
	195
	196	static struct i2c_driver tef6862_driver = {
	197	.driver = {
eea85b0a RR	198	.name = DRIVER_NAME,
	199	},
	200	.probe = tef6862_probe,
4c62e976	201	.remove = tef6862_remove,
eea85b0a RR	202	.id_table = tef6862_id,
	203	};
	204
c6e8d86f	205	module_i2c_driver(tef6862_driver);
eea85b0a RR	206
	207	MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
	208	MODULE_AUTHOR("Mocean Laboratories");
	209	MODULE_LICENSE("GPL v2");