aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/tef6862.c
blob: b18c2dc268bab2705ee6cd88cdcea9bb970c71aa (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
/*
 * 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>
#include <media/v4l2-chip-ident.h>

#define DRIVER_NAME "tef6862"

#define FREQ_MUL 16000

#define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
#define TEF6862_HI_FREQ (108 * 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 MODE_BUFFER		0x0
#define MODE_PRESET		0x1
#define MODE_SEARCH		0x2
#define MODE_AF_UPDATE		0x3
#define MODE_JUMP		0x4
#define MODE_CHECK		0x5
#define MODE_LOAD		0x6
#define MODE_END		0x7
#define 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, struct v4l2_tuner *v)
{
	return v->index ? -EINVAL : 0;
}

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

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

	pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
	i2cmsg[0] = (MODE_PRESET << 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 = f->frequency;
	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 int tef6862_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_TEF6862, 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_core_ops tef6862_core_ops = {
	.g_chip_ident = tef6862_g_chip_ident,
};

static const struct v4l2_subdev_ops tef6862_ops = {
	.core = &tef6862_core_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 = {
		.owner	= THIS_MODULE,
		.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");