drivers/media/video/cs53l32a.c

   1 /*
   2  * cs53l32a (Adaptec AVC-2010 and AVC-2410) i2c ivtv driver.
   3  * Copyright (C) 2005  Martin Vaughan
   4  *
   5  * Audio source switching for Adaptec AVC-2410 added by Trev Jackson
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22
  23 #include <linux/module.h>
  24 #include <linux/types.h>
  25 #include <linux/ioctl.h>
  26 #include <asm/uaccess.h>
  27 #include <linux/i2c.h>
  28 #include <linux/i2c-id.h>
  29 #include <linux/videodev.h>
  30 #include <media/v4l2-common.h>
  31
  32 MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
  33 MODULE_AUTHOR("Martin Vaughan");
  34 MODULE_LICENSE("GPL");
  35
  36 static int debug = 0;
  37
  38 module_param(debug, bool, 0644);
  39
  40 MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");
  41
  42 static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };
  43
  44
  45 I2C_CLIENT_INSMOD;
  46
  47 /* ----------------------------------------------------------------------- */
  48
  49 static int cs53l32a_write(struct i2c_client *client, u8 reg, u8 value)
  50 {
  51         return i2c_smbus_write_byte_data(client, reg, value);
  52 }
  53
  54 static int cs53l32a_read(struct i2c_client *client, u8 reg)
  55 {
  56         return i2c_smbus_read_byte_data(client, reg);
  57 }
  58
  59 static int cs53l32a_command(struct i2c_client *client, unsigned int cmd,
  60                             void *arg)
  61 {
  62         struct v4l2_audio *input = arg;
  63         struct v4l2_control *ctrl = arg;
  64
  65         switch (cmd) {
  66         case VIDIOC_S_AUDIO:
  67                 /* There are 2 physical inputs, but the second input can be
  68                    placed in two modes, the first mode bypasses the PGA (gain),
  69                    the second goes through the PGA. Hence there are three
  70                    possible inputs to choose from. */
  71                 if (input->index > 2) {
  72                         v4l_err(client, "Invalid input %d.\n", input->index);
  73                         return -EINVAL;
  74                 }
  75                 cs53l32a_write(client, 0x01, 0x01 + (input->index << 4));
  76                 break;
  77
  78         case VIDIOC_G_AUDIO:
  79                 memset(input, 0, sizeof(*input));
  80                 input->index = (cs53l32a_read(client, 0x01) >> 4) & 3;
  81                 break;
  82
  83         case VIDIOC_G_CTRL:
  84                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  85                         ctrl->value = (cs53l32a_read(client, 0x03) & 0xc0) != 0;
  86                         break;
  87                 }
  88                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  89                         return -EINVAL;
  90                 ctrl->value = (s8)cs53l32a_read(client, 0x04);
  91                 break;
  92
  93         case VIDIOC_S_CTRL:
  94                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  95                         cs53l32a_write(client, 0x03, ctrl->value ? 0xf0 : 0x30);
  96                         break;
  97                 }
  98                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  99                         return -EINVAL;
 100                 if (ctrl->value > 12 || ctrl->value < -96)
 101                         return -EINVAL;
 102                 cs53l32a_write(client, 0x04, (u8) ctrl->value);
 103                 cs53l32a_write(client, 0x05, (u8) ctrl->value);
 104                 break;
 105
 106         case VIDIOC_LOG_STATUS:
 107                 {
 108                         u8 v = cs53l32a_read(client, 0x01);
 109                         u8 m = cs53l32a_read(client, 0x03);
 110                         s8 vol = cs53l32a_read(client, 0x04);
 111
 112                         v4l_info(client, "Input:  %d%s\n", (v >> 4) & 3,
 113                                       (m & 0xC0) ? " (muted)" : "");
 114                         v4l_info(client, "Volume: %d dB\n", vol);
 115                         break;
 116                 }
 117
 118         default:
 119                 return -EINVAL;
 120         }
 121         return 0;
 122 }
 123
 124 /* ----------------------------------------------------------------------- */
 125
 126 /* i2c implementation */
 127
 128 /*
 129  * Generic i2c probe
 130  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 131  */
 132
 133 static struct i2c_driver i2c_driver;
 134
 135 static int cs53l32a_attach(struct i2c_adapter *adapter, int address, int kind)
 136 {
 137         struct i2c_client *client;
 138         int i;
 139
 140         /* Check if the adapter supports the needed features */
 141         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 142                 return 0;
 143
 144         client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
 145         if (client == 0)
 146                 return -ENOMEM;
 147
 148         memset(client, 0, sizeof(struct i2c_client));
 149         client->addr = address;
 150         client->adapter = adapter;
 151         client->driver = &i2c_driver;
 152         snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");
 153
 154         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 155
 156         for (i = 1; i <= 7; i++) {
 157                 u8 v = cs53l32a_read(client, i);
 158
 159                 v4l_dbg(1, client, "Read Reg %d %02x\n", i, v);
 160         }
 161
 162         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 163
 164         cs53l32a_write(client, 0x01, (u8) 0x21);
 165         cs53l32a_write(client, 0x02, (u8) 0x29);
 166         cs53l32a_write(client, 0x03, (u8) 0x30);
 167         cs53l32a_write(client, 0x04, (u8) 0x00);
 168         cs53l32a_write(client, 0x05, (u8) 0x00);
 169         cs53l32a_write(client, 0x06, (u8) 0x00);
 170         cs53l32a_write(client, 0x07, (u8) 0x00);
 171
 172         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 173
 174         for (i = 1; i <= 7; i++) {
 175                 u8 v = cs53l32a_read(client, i);
 176
 177                 v4l_dbg(1, client, "Read Reg %d %02x\n", i, v);
 178         }
 179
 180         i2c_attach_client(client);
 181
 182         return 0;
 183 }
 184
 185 static int cs53l32a_probe(struct i2c_adapter *adapter)
 186 {
 187         if (adapter->class & I2C_CLASS_TV_ANALOG)
 188                 return i2c_probe(adapter, &addr_data, cs53l32a_attach);
 189         return 0;
 190 }
 191
 192 static int cs53l32a_detach(struct i2c_client *client)
 193 {
 194         int err;
 195
 196         err = i2c_detach_client(client);
 197         if (err) {
 198                 return err;
 199         }
 200         kfree(client);
 201
 202         return 0;
 203 }
 204
 205 /* ----------------------------------------------------------------------- */
 206
 207 /* i2c implementation */
 208 static struct i2c_driver i2c_driver = {
 209         .driver = {
 210                 .name = "cs53l32a",
 211         },
 212         .id = I2C_DRIVERID_CS53L32A,
 213         .attach_adapter = cs53l32a_probe,
 214         .detach_client = cs53l32a_detach,
 215         .command = cs53l32a_command,
 216 };
 217
 218
 219 static int __init cs53l32a_init_module(void)
 220 {
 221         return i2c_add_driver(&i2c_driver);
 222 }
 223
 224 static void __exit cs53l32a_cleanup_module(void)
 225 {
 226         i2c_del_driver(&i2c_driver);
 227 }
 228
 229 module_init(cs53l32a_init_module);
 230 module_exit(cs53l32a_cleanup_module);