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 <media/v4l2-ioctl.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-chip-ident.h>
30 #define DRIVER_NAME "tef6862"
32 #define FREQ_MUL 16000
34 #define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
35 #define TEF6862_HI_FREQ (108 * FREQ_MUL)
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
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
57 #define MODE_CHECK 0x5
62 struct tef6862_state {
63 struct v4l2_subdev sd;
67 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
69 return container_of(sd, struct tef6862_state, sd);
72 static u16 tef6862_sigstr(struct i2c_client *client)
75 int err = i2c_master_recv(client, buf, sizeof(buf));
76 if (err == sizeof(buf))
81 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
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));
99 static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
101 return v->index ? -EINVAL : 0;
104 static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
106 struct tef6862_state *state = to_state(sd);
107 struct i2c_client *client = v4l2_get_subdevdata(sd);
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;
120 err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
122 state->freq = f->frequency;
126 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
128 struct tef6862_state *state = to_state(sd);
132 f->type = V4L2_TUNER_RADIO;
133 f->frequency = state->freq;
137 static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
138 struct v4l2_dbg_chip_ident *chip)
140 struct i2c_client *client = v4l2_get_subdevdata(sd);
142 return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
145 static const struct v4l2_subdev_tuner_ops tef6862_tuner_ops = {
146 .g_tuner = tef6862_g_tuner,
147 .s_tuner = tef6862_s_tuner,
148 .s_frequency = tef6862_s_frequency,
149 .g_frequency = tef6862_g_frequency,
152 static const struct v4l2_subdev_core_ops tef6862_core_ops = {
153 .g_chip_ident = tef6862_g_chip_ident,
156 static const struct v4l2_subdev_ops tef6862_ops = {
157 .core = &tef6862_core_ops,
158 .tuner = &tef6862_tuner_ops,
163 * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
166 static int __devinit tef6862_probe(struct i2c_client *client,
167 const struct i2c_device_id *id)
169 struct tef6862_state *state;
170 struct v4l2_subdev *sd;
172 /* Check if the adapter supports the needed features */
173 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
176 v4l_info(client, "chip found @ 0x%02x (%s)\n",
177 client->addr << 1, client->adapter->name);
179 state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
182 state->freq = TEF6862_LO_FREQ;
185 v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
190 static int __devexit tef6862_remove(struct i2c_client *client)
192 struct v4l2_subdev *sd = i2c_get_clientdata(client);
194 v4l2_device_unregister_subdev(sd);
199 static const struct i2c_device_id tef6862_id[] = {
204 MODULE_DEVICE_TABLE(i2c, tef6862_id);
206 static struct i2c_driver tef6862_driver = {
208 .owner = THIS_MODULE,
211 .probe = tef6862_probe,
212 .remove = tef6862_remove,
213 .id_table = tef6862_id,
216 static __init int tef6862_init(void)
218 return i2c_add_driver(&tef6862_driver);
221 static __exit void tef6862_exit(void)
223 i2c_del_driver(&tef6862_driver);
226 module_init(tef6862_init);
227 module_exit(tef6862_exit);
229 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
230 MODULE_AUTHOR("Mocean Laboratories");
231 MODULE_LICENSE("GPL v2");