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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>
25#include <linux/slab.h>
26#include <media/v4l2-ioctl.h>
27#include <media/v4l2-device.h>
28#include <media/v4l2-chip-ident.h>
29
30#define DRIVER_NAME "tef6862"
31
32#define FREQ_MUL 16000
33
34#define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
35#define TEF6862_HI_FREQ (108 * FREQ_MUL)
36
37/* Write mode sub addresses */
38#define WM_SUB_BANDWIDTH 0x0
39#define WM_SUB_PLLM 0x1
40#define WM_SUB_PLLL 0x2
41#define WM_SUB_DAA 0x3
42#define WM_SUB_AGC 0x4
43#define WM_SUB_BAND 0x5
44#define WM_SUB_CONTROL 0x6
45#define WM_SUB_LEVEL 0x7
46#define WM_SUB_IFCF 0x8
47#define WM_SUB_IFCAP 0x9
48#define WM_SUB_ACD 0xA
49#define WM_SUB_TEST 0xF
50
51/* Different modes of the MSA register */
52#define MODE_BUFFER 0x0
53#define MODE_PRESET 0x1
54#define MODE_SEARCH 0x2
55#define MODE_AF_UPDATE 0x3
56#define MODE_JUMP 0x4
57#define MODE_CHECK 0x5
58#define MODE_LOAD 0x6
59#define MODE_END 0x7
60#define MODE_SHIFT 5
61
62struct tef6862_state {
63 struct v4l2_subdev sd;
64 unsigned long freq;
65};
66
67static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
68{
69 return container_of(sd, struct tef6862_state, sd);
70}
71
72static u16 tef6862_sigstr(struct i2c_client *client)
73{
74 u8 buf[4];
75 int err = i2c_master_recv(client, buf, sizeof(buf));
76 if (err == sizeof(buf))
77 return buf[3] << 8;
78 return 0;
79}
80
81static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
82{
83 if (v->index > 0)
84 return -EINVAL;
85
86 /* only support FM for now */
87 strlcpy(v->name, "FM", sizeof(v->name));
88 v->type = V4L2_TUNER_RADIO;
89 v->rangelow = TEF6862_LO_FREQ;
90 v->rangehigh = TEF6862_HI_FREQ;
91 v->rxsubchans = V4L2_TUNER_SUB_MONO;
92 v->capability = V4L2_TUNER_CAP_LOW;
93 v->audmode = V4L2_TUNER_MODE_STEREO;
94 v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
95
96 return 0;
97}
98
99static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
100{
101 return v->index ? -EINVAL : 0;
102}
103
104static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
105{
106 struct tef6862_state *state = to_state(sd);
107 struct i2c_client *client = v4l2_get_subdevdata(sd);
108 u16 pll;
109 u8 i2cmsg[3];
110 int err;
111
112 if (f->tuner != 0)
113 return -EINVAL;
114
115 pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
116 i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;
117 i2cmsg[1] = (pll >> 8) & 0xff;
118 i2cmsg[2] = pll & 0xff;
119
120 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
121 if (err != sizeof(i2cmsg))
122 return err < 0 ? err : -EIO;
123
124 state->freq = f->frequency;
125 return 0;
126}
127
128static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
129{
130 struct tef6862_state *state = to_state(sd);
131
132 if (f->tuner != 0)
133 return -EINVAL;
134 f->type = V4L2_TUNER_RADIO;
135 f->frequency = state->freq;
136 return 0;
137}
138
139static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
140 struct v4l2_dbg_chip_ident *chip)
141{
142 struct i2c_client *client = v4l2_get_subdevdata(sd);
143
144 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
145}
146
147static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
148 .g_tuner = tef6862_g_tuner,
149 .s_tuner = tef6862_s_tuner,
150 .s_frequency = tef6862_s_frequency,
151 .g_frequency = tef6862_g_frequency,
152};
153
154static const struct v4l2_subdev_core_ops tef6862_core_ops = {
155 .g_chip_ident = tef6862_g_chip_ident,
156};
157
158static const struct v4l2_subdev_ops tef6862_ops = {
159 .core = &tef6862_core_ops,
160 .tuner = &tef6862_tuner_ops,
161};
162
163/*
164 * Generic i2c probe
165 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
166 */
167
168static int __devinit tef6862_probe(struct i2c_client *client,
169 const struct i2c_device_id *id)
170{
171 struct tef6862_state *state;
172 struct v4l2_subdev *sd;
173
174 /* Check if the adapter supports the needed features */
175 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
176 return -EIO;
177
178 v4l_info(client, "chip found @ 0x%02x (%s)\n",
179 client->addr << 1, client->adapter->name);
180
181 state = kzalloc(sizeof(struct tef6862_state), GFP_KERNEL);
182 if (state == NULL)
183 return -ENOMEM;
184 state->freq = TEF6862_LO_FREQ;
185
186 sd = &state->sd;
187 v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
188
189 return 0;
190}
191
192static int __devexit tef6862_remove(struct i2c_client *client)
193{
194 struct v4l2_subdev *sd = i2c_get_clientdata(client);
195
196 v4l2_device_unregister_subdev(sd);
197 kfree(to_state(sd));
198 return 0;
199}
200
201static const struct i2c_device_id tef6862_id[] = {
202 {DRIVER_NAME, 0},
203 {},
204};
205
206MODULE_DEVICE_TABLE(i2c, tef6862_id);
207
208static struct i2c_driver tef6862_driver = {
209 .driver = {
210 .owner = THIS_MODULE,
211 .name = DRIVER_NAME,
212 },
213 .probe = tef6862_probe,
214 .remove = __devexit_p(tef6862_remove),
215 .id_table = tef6862_id,
216};
217
218module_i2c_driver(tef6862_driver);
219
220MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
221MODULE_AUTHOR("Mocean Laboratories");
222MODULE_LICENSE("GPL v2");