drivers/media/radio/tef6862.c

   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/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>
  30
  31 #define DRIVER_NAME "tef6862"
  32
  33 #define FREQ_MUL 16000
  34
  35 #define TEF6862_LO_FREQ (875 * FREQ_MUL / 10)
  36 #define TEF6862_HI_FREQ (108 * FREQ_MUL)
  37
  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
  51
  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
  57 #define MODE_JUMP               0x4
  58 #define MODE_CHECK              0x5
  59 #define MODE_LOAD               0x6
  60 #define MODE_END                0x7
  61 #define MODE_SHIFT              5
  62
  63 struct tef6862_state {
  64         struct v4l2_subdev sd;
  65         unsigned long freq;
  66 };
  67
  68 static inline struct tef6862_state *to_state(struct v4l2_subdev *sd)
  69 {
  70         return container_of(sd, struct tef6862_state, sd);
  71 }
  72
  73 static u16 tef6862_sigstr(struct i2c_client *client)
  74 {
  75         u8 buf[4];
  76         int err = i2c_master_recv(client, buf, sizeof(buf));
  77         if (err == sizeof(buf))
  78                 return buf[3] << 8;
  79         return 0;
  80 }
  81
  82 static int tef6862_g_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
  83 {
  84         if (v->index > 0)
  85                 return -EINVAL;
  86
  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));
  96
  97         return 0;
  98 }
  99
 100 static int tef6862_s_tuner(struct v4l2_subdev *sd, struct v4l2_tuner *v)
 101 {
 102         return v->index ? -EINVAL : 0;
 103 }
 104
 105 static int tef6862_s_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
 106 {
 107         struct tef6862_state *state = to_state(sd);
 108         struct i2c_client *client = v4l2_get_subdevdata(sd);
 109         u16 pll;
 110         u8 i2cmsg[3];
 111         int err;
 112
 113         if (f->tuner != 0)
 114                 return -EINVAL;
 115
 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;
 120
 121         err = i2c_master_send(client, i2cmsg, sizeof(i2cmsg));
 122         if (!err)
 123                 state->freq = f->frequency;
 124         return err;
 125 }
 126
 127 static int tef6862_g_frequency(struct v4l2_subdev *sd, struct v4l2_frequency *f)
 128 {
 129         struct tef6862_state *state = to_state(sd);
 130
 131         if (f->tuner != 0)
 132                 return -EINVAL;
 133         f->type = V4L2_TUNER_RADIO;
 134         f->frequency = state->freq;
 135         return 0;
 136 }
 137
 138 static int tef6862_g_chip_ident(struct v4l2_subdev *sd,
 139         struct v4l2_dbg_chip_ident *chip)
 140 {
 141         struct i2c_client *client = v4l2_get_subdevdata(sd);
 142
 143         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_TEF6862, 0);
 144 }
 145
 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,
 151 };
 152
 153 static const struct v4l2_subdev_core_ops tef6862_core_ops = {
 154         .g_chip_ident = tef6862_g_chip_ident,
 155 };
 156
 157 static const struct v4l2_subdev_ops tef6862_ops = {
 158         .core = &tef6862_core_ops,
 159         .tuner = &tef6862_tuner_ops,
 160 };
 161
 162 /*
 163  * Generic i2c probe
 164  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 165  */
 166
 167 static int __devinit tef6862_probe(struct i2c_client *client,
 168                         const struct i2c_device_id *id)
 169 {
 170         struct tef6862_state *state;
 171         struct v4l2_subdev *sd;
 172
 173         /* Check if the adapter supports the needed features */
 174         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 175                 return -EIO;
 176
 177         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 178                         client->addr << 1, client->adapter->name);
 179
 180         state = kmalloc(sizeof(struct tef6862_state), GFP_KERNEL);
 181         if (state == NULL)
 182                 return -ENOMEM;
 183         state->freq = TEF6862_LO_FREQ;
 184
 185         sd = &state->sd;
 186         v4l2_i2c_subdev_init(sd, client, &tef6862_ops);
 187
 188         return 0;
 189 }
 190
 191 static int __devexit tef6862_remove(struct i2c_client *client)
 192 {
 193         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 194
 195         v4l2_device_unregister_subdev(sd);
 196         kfree(to_state(sd));
 197         return 0;
 198 }
 199
 200 static const struct i2c_device_id tef6862_id[] = {
 201         {DRIVER_NAME, 0},
 202         {},
 203 };
 204
 205 MODULE_DEVICE_TABLE(i2c, tef6862_id);
 206
 207 static struct i2c_driver tef6862_driver = {
 208         .driver = {
 209                 .owner  = THIS_MODULE,
 210                 .name   = DRIVER_NAME,
 211         },
 212         .probe          = tef6862_probe,
 213         .remove         = tef6862_remove,
 214         .id_table       = tef6862_id,
 215 };
 216
 217 static __init int tef6862_init(void)
 218 {
 219         return i2c_add_driver(&tef6862_driver);
 220 }
 221
 222 static __exit void tef6862_exit(void)
 223 {
 224         i2c_del_driver(&tef6862_driver);
 225 }
 226
 227 module_init(tef6862_init);
 228 module_exit(tef6862_exit);
 229
 230 MODULE_DESCRIPTION("TEF6862 Car Radio Enhanced Selectivity Tuner");
 231 MODULE_AUTHOR("Mocean Laboratories");
 232 MODULE_LICENSE("GPL v2");
 233