2 * tef6862.c Philips TEF6862 Car Radio Enhanced Selectivity Tuner
3 * Copyright (c) 2009 Intel Corporation
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.
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.
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.
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/i2c-id.h>
26 #include <linux/slab.h>
27 #include <media/v4l2-ioctl.h>
28 #include <media/v4l2-device.h>
29 #include <media/v4l2-chip-ident.h>
31 #define DRIVER_NAME "tef6862"
33 #define FREQ_MUL 16000
35 #define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
36 #define TEF6862_HI_FREQ (108 * FREQ_MUL)
38 /* Write mode sub addresses */
39 #define WM_SUB_BANDWIDTH 0x0
40 #define WM_SUB_PLLM 0x1
41 #define WM_SUB_PLLL 0x2
42 #define WM_SUB_DAA 0x3
43 #define WM_SUB_AGC 0x4
44 #define WM_SUB_BAND 0x5
45 #define WM_SUB_CONTROL 0x6
46 #define WM_SUB_LEVEL 0x7
47 #define WM_SUB_IFCF 0x8
48 #define WM_SUB_IFCAP 0x9
49 #define WM_SUB_ACD 0xA
50 #define WM_SUB_TEST 0xF
52 /* Different modes of the MSA register */
53 #define MODE_BUFFER 0x0
54 #define MODE_PRESET 0x1
55 #define MODE_SEARCH 0x2
56 #define MODE_AF_UPDATE 0x3
58 #define MODE_CHECK 0x5
63 struct tef6862_state {
64 struct v4l2_subdev sd;
68 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
70 return container_of(sd, struct tef6862_state, sd);
73 static u16 tef6862_sigstr(struct i2c_client *client)
76 int err = i2c_master_recv(client, buf, sizeof(buf));
77 if (err == sizeof(buf))
82 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
87 /* only support FM for now */
88 strlcpy(v->name, "FM", sizeof(v->name));
89 v->type = V4L2_TUNER_RADIO;
90 v->rangelow = TEF6862_LO_FREQ;
91 v->rangehigh = TEF6862_HI_FREQ;
92 v->rxsubchans = V4L2_TUNER_SUB_MONO;
93 v->capability = V4L2_TUNER_CAP_LOW;
94 v->audmode = V4L2_TUNER_MODE_STEREO;
95 v->signal = tef6862_sigstr(v4l2_get_subdevdata(sd));
100 static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
102 return v->index ? -EINVAL : 0;
105 static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
107 struct tef6862_state *state = to_state(sd);
108 struct i2c_client *client = v4l2_get_subdevdata(sd);
116 pll = 1964 + ((f->frequency - TEF6862_LO_FREQ) * 20) / FREQ_MUL;
117 i2cmsg[0] = (MODE_PRESET << MODE_SHIFT) | WM_SUB_PLLM;
118 i2cmsg[1] = (pll >> 8) & 0xff;
119 i2cmsg[2] = pll & 0xff;
121 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
123 state->freq = f->frequency;
127 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
129 struct tef6862_state *state = to_state(sd);
133 f->type = V4L2_TUNER_RADIO;
134 f->frequency = state->freq;
138 static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
139 struct v4l2_dbg_chip_ident *chip)
141 struct i2c_client *client = v4l2_get_subdevdata(sd);
143 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
146 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
147 .g_tuner = tef6862_g_tuner,
148 .s_tuner = tef6862_s_tuner,
149 .s_frequency = tef6862_s_frequency,
150 .g_frequency = tef6862_g_frequency,
153 static const struct v4l2_subdev_core_ops tef6862_core_ops = {
154 .g_chip_ident = tef6862_g_chip_ident,
157 static const struct v4l2_subdev_ops tef6862_ops = {
158 .core = &tef6862_core_ops,
159 .tuner = &tef6862_tuner_ops,
164 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
167 static int __devinit tef6862_probe(struct i2c_client *client,
168 const struct i2c_device_id *id)
170 struct tef6862_state *state;
171 struct v4l2_subdev *sd;
173 /* Check if the adapter supports the needed features */
174 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
177 v4l_info(client, "chip found @ 0x%02x (%s)\n",
178 client->addr << 1, client->adapter->name);
180 state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
183 state->freq = TEF6862_LO_FREQ;
186 v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
191 static int __devexit tef6862_remove(struct i2c_client *client)
193 struct v4l2_subdev *sd = i2c_get_clientdata(client);
195 v4l2_device_unregister_subdev(sd);
200 static const struct i2c_device_id tef6862_id[] = {
205 MODULE_DEVICE_TABLE(i2c, tef6862_id);
207 static struct i2c_driver tef6862_driver = {
209 .owner = THIS_MODULE,
212 .probe = tef6862_probe,
213 .remove = tef6862_remove,
214 .id_table = tef6862_id,
217 static __init int tef6862_init(void)
219 return i2c_add_driver(&tef6862_driver);
222 static __exit void tef6862_exit(void)
224 i2c_del_driver(&tef6862_driver);
227 module_init(tef6862_init);
228 module_exit(tef6862_exit);
230 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
231 MODULE_AUTHOR("Mocean Laboratories");
232 MODULE_LICENSE("GPL v2");