blob: a9319a24c7efe1290efbc5b309bb719584cf7b5f [file] [log] [blame]
Richard Röjforseea85b02009-09-22 10:14:39 -03001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090025#include <linux/slab.h>
Richard Röjforseea85b02009-09-22 10:14:39 -030026#include <media/v4l2-ioctl.h>
27#include <media/v4l2-device.h>
Richard Röjforseea85b02009-09-22 10:14:39 -030028
29#define DRIVER_NAME "tef6862"
30
31#define FREQ_MUL 16000
32
Hans Verkuilfa915992013-05-31 06:19:55 -030033#define TEF6862_LO_FREQ (875U * FREQ_MUL / 10)
34#define TEF6862_HI_FREQ (108U * FREQ_MUL)
Richard Röjforseea85b02009-09-22 10:14:39 -030035
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 */
Mauro Carvalho Chehab5f27ca42013-11-01 13:19:05 -030051#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
Richard Röjforseea85b02009-09-22 10:14:39 -030060
61struct tef6862_state {
62 struct v4l2_subdev sd;
63 unsigned long freq;
64};
65
66static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
67{
68 return container_of(sd, struct tef6862_state, sd);
69}
70
71static 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
80static 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
Hans Verkuil2f73c7c2013-03-15 06:10:06 -030098static int tef6862_s_tuner(struct v4l2_subdev *sd, const struct v4l2_tuner *v)
Richard Röjforseea85b02009-09-22 10:14:39 -030099{
100 return v->index ? -EINVAL : 0;
101}
102
Hans Verkuilb530a442013-03-19 04:09:26 -0300103static int tef6862_s_frequency(struct v4l2_subdev *sd, const struct v4l2_frequency *f)
Richard Röjforseea85b02009-09-22 10:14:39 -0300104{
105 struct tef6862_state *state = to_state(sd);
106 struct i2c_client *client = v4l2_get_subdevdata(sd);
Hans Verkuilfa915992013-05-31 06:19:55 -0300107 unsigned freq = f->frequency;
Richard Röjforseea85b02009-09-22 10:14:39 -0300108 u16 pll;
109 u8 i2cmsg[3];
110 int err;
111
112 if (f->tuner != 0)
113 return -EINVAL;
114
Hans Verkuil9ba6a912013-11-04 06:28:57 -0300115 freq = clamp(freq, TEF6862_LO_FREQ, TEF6862_HI_FREQ);
Hans Verkuilfa915992013-05-31 06:19:55 -0300116 pll = 1964 + ((freq - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
Mauro Carvalho Chehab5f27ca42013-11-01 13:19:05 -0300117 i2cmsg[0] = (MSA_MODE_PRESET << MSA_MODE_SHIFT) | WM_SUB_PLLM;
Richard Röjforseea85b02009-09-22 10:14:39 -0300118 i2cmsg[1] = (pll >> 8) & 0xff;
119 i2cmsg[2] = pll & 0xff;
120
121 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
Axel Linbd93b3a2011-11-16 05:14:03 -0300122 if (err != sizeof(i2cmsg))
123 return err < 0 ? err : -EIO;
124
Hans Verkuilfa915992013-05-31 06:19:55 -0300125 state->freq = freq;
Axel Linbd93b3a2011-11-16 05:14:03 -0300126 return 0;
Richard Röjforseea85b02009-09-22 10:14:39 -0300127}
128
129static 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
Richard Röjforseea85b02009-09-22 10:14:39 -0300140static 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
Richard Röjforseea85b02009-09-22 10:14:39 -0300147static const struct v4l2_subdev_ops tef6862_ops = {
Richard Röjforseea85b02009-09-22 10:14:39 -0300148 .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
Greg Kroah-Hartman4c62e972012-12-21 13:17:53 -0800156static int tef6862_probe(struct i2c_client *client,
157 const struct i2c_device_id *id)
Richard Röjforseea85b02009-09-22 10:14:39 -0300158{
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
Herton Ronaldo Krzesinski80845a32011-04-01 14:12:02 -0300169 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
Richard Röjforseea85b02009-09-22 10:14:39 -0300170 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
Greg Kroah-Hartman4c62e972012-12-21 13:17:53 -0800180static int tef6862_remove(struct i2c_client *client)
Richard Röjforseea85b02009-09-22 10:14:39 -0300181{
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
189static const struct i2c_device_id tef6862_id[] = {
190 {DRIVER_NAME, 0},
191 {},
192};
193
194MODULE_DEVICE_TABLE(i2c, tef6862_id);
195
196static struct i2c_driver tef6862_driver = {
197 .driver = {
198 .owner = THIS_MODULE,
199 .name = DRIVER_NAME,
200 },
201 .probe = tef6862_probe,
Greg Kroah-Hartman4c62e972012-12-21 13:17:53 -0800202 .remove = tef6862_remove,
Richard Röjforseea85b02009-09-22 10:14:39 -0300203 .id_table = tef6862_id,
204};
205
Axel Linc6e8d862012-02-12 06:56:32 -0300206module_i2c_driver(tef6862_driver);
Richard Röjforseea85b02009-09-22 10:14:39 -0300207
208MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
209MODULE_AUTHOR("Mocean Laboratories");
210MODULE_LICENSE("GPL v2");