drivers/media/video/adv7180.c

   1 /*
   2  * adv7180.c Analog Devices ADV7180 video decoder driver
   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 <media/v4l2-ioctl.h>
  27 #include <linux/videodev2.h>
  28 #include <media/v4l2-device.h>
  29 #include <media/v4l2-chip-ident.h>
  30
  31 #define DRIVER_NAME "adv7180"
  32
  33 #define ADV7180_INPUT_CONTROL_REG       0x00
  34 #define ADV7180_INPUT_CONTROL_PAL_BG_NTSC_J_SECAM       0x00
  35 #define ADV7180_AUTODETECT_ENABLE_REG   0x07
  36 #define ADV7180_AUTODETECT_DEFAULT      0x7f
  37
  38
  39 #define ADV7180_STATUS1_REG 0x10
  40 #define ADV7180_STATUS1_AUTOD_MASK 0x70
  41 #define ADV7180_STATUS1_AUTOD_NTSM_M_J  0x00
  42 #define ADV7180_STATUS1_AUTOD_NTSC_4_43 0x10
  43 #define ADV7180_STATUS1_AUTOD_PAL_M     0x20
  44 #define ADV7180_STATUS1_AUTOD_PAL_60    0x30
  45 #define ADV7180_STATUS1_AUTOD_PAL_B_G   0x40
  46 #define ADV7180_STATUS1_AUTOD_SECAM     0x50
  47 #define ADV7180_STATUS1_AUTOD_PAL_COMB  0x60
  48 #define ADV7180_STATUS1_AUTOD_SECAM_525 0x70
  49
  50 #define ADV7180_IDENT_REG 0x11
  51 #define ADV7180_ID_7180 0x18
  52
  53
  54 struct adv7180_state {
  55         struct v4l2_subdev sd;
  56 };
  57
  58 static v4l2_std_id determine_norm(struct i2c_client *client)
  59 {
  60         u8 status1 = i2c_smbus_read_byte_data(client, ADV7180_STATUS1_REG);
  61
  62         switch (status1 & ADV7180_STATUS1_AUTOD_MASK) {
  63         case ADV7180_STATUS1_AUTOD_NTSM_M_J:
  64                 return V4L2_STD_NTSC_M_JP;
  65         case ADV7180_STATUS1_AUTOD_NTSC_4_43:
  66                 return V4L2_STD_NTSC_443;
  67         case ADV7180_STATUS1_AUTOD_PAL_M:
  68                 return V4L2_STD_PAL_M;
  69         case ADV7180_STATUS1_AUTOD_PAL_60:
  70                 return V4L2_STD_PAL_60;
  71         case ADV7180_STATUS1_AUTOD_PAL_B_G:
  72                 return V4L2_STD_PAL;
  73         case ADV7180_STATUS1_AUTOD_SECAM:
  74                 return V4L2_STD_SECAM;
  75         case ADV7180_STATUS1_AUTOD_PAL_COMB:
  76                 return V4L2_STD_PAL_Nc | V4L2_STD_PAL_N;
  77         case ADV7180_STATUS1_AUTOD_SECAM_525:
  78                 return V4L2_STD_SECAM;
  79         default:
  80                 return V4L2_STD_UNKNOWN;
  81         }
  82 }
  83
  84 static inline struct adv7180_state *to_state(struct v4l2_subdev *sd)
  85 {
  86         return container_of(sd, struct adv7180_state, sd);
  87 }
  88
  89 static int adv7180_querystd(struct v4l2_subdev *sd, v4l2_std_id *std)
  90 {
  91         struct i2c_client *client = v4l2_get_subdevdata(sd);
  92
  93         *std = determine_norm(client);
  94         return 0;
  95 }
  96
  97 static int adv7180_g_chip_ident(struct v4l2_subdev *sd,
  98         struct v4l2_dbg_chip_ident *chip)
  99 {
 100         struct i2c_client *client = v4l2_get_subdevdata(sd);
 101
 102         return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_ADV7180, 0);
 103 }
 104
 105 static const struct v4l2_subdev_video_ops adv7180_video_ops = {
 106         .querystd = adv7180_querystd,
 107 };
 108
 109 static const struct v4l2_subdev_core_ops adv7180_core_ops = {
 110         .g_chip_ident = adv7180_g_chip_ident,
 111 };
 112
 113 static const struct v4l2_subdev_ops adv7180_ops = {
 114         .core = &adv7180_core_ops,
 115         .video = &adv7180_video_ops,
 116 };
 117
 118 /*
 119  * Generic i2c probe
 120  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 121  */
 122
 123 static int adv7180_probe(struct i2c_client *client,
 124                         const struct i2c_device_id *id)
 125 {
 126         struct adv7180_state *state;
 127         struct v4l2_subdev *sd;
 128         int ret;
 129
 130         /* Check if the adapter supports the needed features */
 131         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 132                 return -EIO;
 133
 134         v4l_info(client, "chip found @ 0x%02x (%s)\n",
 135                         client->addr << 1, client->adapter->name);
 136
 137         state = kzalloc(sizeof(struct adv7180_state), GFP_KERNEL);
 138         if (state == NULL)
 139                 return -ENOMEM;
 140         sd = &state->sd;
 141         v4l2_i2c_subdev_init(sd, client, &adv7180_ops);
 142
 143         /* Initialize adv7180 */
 144         /* enable autodetection */
 145         ret = i2c_smbus_write_byte_data(client, ADV7180_INPUT_CONTROL_REG,
 146                 ADV7180_INPUT_CONTROL_PAL_BG_NTSC_J_SECAM);
 147         if (ret > 0)
 148                 ret = i2c_smbus_write_byte_data(client,
 149                         ADV7180_AUTODETECT_ENABLE_REG,
 150                         ADV7180_AUTODETECT_DEFAULT);
 151         if (ret < 0) {
 152                 printk(KERN_ERR DRIVER_NAME
 153                         ": Failed to communicate to chip: %d\n", ret);
 154                 return ret;
 155         }
 156
 157         return 0;
 158 }
 159
 160 static int adv7180_remove(struct i2c_client *client)
 161 {
 162         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 163
 164         v4l2_device_unregister_subdev(sd);
 165         kfree(to_state(sd));
 166         return 0;
 167 }
 168
 169 static const struct i2c_device_id adv7180_id[] = {
 170         {DRIVER_NAME, 0},
 171         {},
 172 };
 173
 174 MODULE_DEVICE_TABLE(i2c, adv7180_id);
 175
 176 static struct i2c_driver adv7180_driver = {
 177         .driver = {
 178                 .owner  = THIS_MODULE,
 179                 .name   = DRIVER_NAME,
 180         },
 181         .probe          = adv7180_probe,
 182         .remove         = adv7180_remove,
 183         .id_table       = adv7180_id,
 184 };
 185
 186 static __init int adv7180_init(void)
 187 {
 188         return i2c_add_driver(&adv7180_driver);
 189 }
 190
 191 static __exit void adv7180_exit(void)
 192 {
 193         i2c_del_driver(&adv7180_driver);
 194 }
 195
 196 module_init(adv7180_init);
 197 module_exit(adv7180_exit);
 198
 199 MODULE_DESCRIPTION("Analog Devices ADV7180 video decoder driver");
 200 MODULE_AUTHOR("Mocean Laboratories");
 201 MODULE_LICENSE("GPL v2");
 202