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 #include <media/v4l2-chip-ident.h>
  32
  33 MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
  34 MODULE_AUTHOR("Martin Vaughan");
  35 MODULE_LICENSE("GPL");
  36
  37 static int debug = 0;
  38
  39 module_param(debug, bool, 0644);
  40
  41 MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");
  42
  43 static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };
  44
  45
  46 I2C_CLIENT_INSMOD;
  47
  48 /* ----------------------------------------------------------------------- */
  49
  50 static int cs53l32a_write(struct i2c_client *client, u8 reg, u8 value)
  51 {
  52         return i2c_smbus_write_byte_data(client, reg, value);
  53 }
  54
  55 static int cs53l32a_read(struct i2c_client *client, u8 reg)
  56 {
  57         return i2c_smbus_read_byte_data(client, reg);
  58 }
  59
  60 static int cs53l32a_command(struct i2c_client *client, unsigned int cmd,
  61                             void *arg)
  62 {
  63         struct v4l2_routing *route = arg;
  64         struct v4l2_control *ctrl = arg;
  65
  66         switch (cmd) {
  67         case VIDIOC_INT_G_AUDIO_ROUTING:
  68                 route->input = (cs53l32a_read(client, 0x01) >> 4) & 3;
  69                 route->output = 0;
  70                 break;
  71
  72         case VIDIOC_INT_S_AUDIO_ROUTING:
  73                 /* There are 2 physical inputs, but the second input can be
  74                    placed in two modes, the first mode bypasses the PGA (gain),
  75                    the second goes through the PGA. Hence there are three
  76                    possible inputs to choose from. */
  77                 if (route->input > 2) {
  78                         v4l_err(client, "Invalid input %d.\n", route->input);
  79                         return -EINVAL;
  80                 }
  81                 cs53l32a_write(client, 0x01, 0x01 + (route->input << 4));
  82                 break;
  83
  84         case VIDIOC_G_CTRL:
  85                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  86                         ctrl->value = (cs53l32a_read(client, 0x03) & 0xc0) != 0;
  87                         break;
  88                 }
  89                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  90                         return -EINVAL;
  91                 ctrl->value = (s8)cs53l32a_read(client, 0x04);
  92                 break;
  93
  94         case VIDIOC_S_CTRL:
  95                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  96                         cs53l32a_write(client, 0x03, ctrl->value ? 0xf0 : 0x30);
  97                         break;
  98                 }
  99                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
 100                         return -EINVAL;
 101                 if (ctrl->value > 12 || ctrl->value < -96)
 102                         return -EINVAL;
 103                 cs53l32a_write(client, 0x04, (u8) ctrl->value);
 104                 cs53l32a_write(client, 0x05, (u8) ctrl->value);
 105                 break;
 106
 107         case VIDIOC_G_CHIP_IDENT:
 108                 return v4l2_chip_ident_i2c_client(client, arg, V4L2_IDENT_CS53l32A, 0);
 109
 110         case VIDIOC_LOG_STATUS:
 111                 {
 112                         u8 v = cs53l32a_read(client, 0x01);
 113                         u8 m = cs53l32a_read(client, 0x03);
 114                         s8 vol = cs53l32a_read(client, 0x04);
 115
 116                         v4l_info(client, "Input:  %d%s\n", (v >> 4) & 3,
 117                                       (m & 0xC0) ? " (muted)" : "");
 118                         v4l_info(client, "Volume: %d dB\n", vol);
 119                         break;
 120                 }
 121
 122         default:
 123                 return -EINVAL;
 124         }
 125         return 0;
 126 }
 127
 128 /* ----------------------------------------------------------------------- */
 129
 130 /* i2c implementation */
 131
 132 /*
 133  * Generic i2c probe
 134  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 135  */
 136
 137 static struct i2c_driver i2c_driver;
 138
 139 static int cs53l32a_attach(struct i2c_adapter *adapter, int address, int kind)
 140 {
 141         struct i2c_client *client;
 142         int i;
 143
 144         /* Check if the adapter supports the needed features */
 145         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 146                 return 0;
 147
 148         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 149         if (client == 0)
 150                 return -ENOMEM;
 151
 152         client->addr = address;
 153         client->adapter = adapter;
 154         client->driver = &i2c_driver;
 155         snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");
 156
 157         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 158
 159         for (i = 1; i <= 7; i++) {
 160                 u8 v = cs53l32a_read(client, i);
 161
 162                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 163         }
 164
 165         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 166
 167         cs53l32a_write(client, 0x01, (u8) 0x21);
 168         cs53l32a_write(client, 0x02, (u8) 0x29);
 169         cs53l32a_write(client, 0x03, (u8) 0x30);
 170         cs53l32a_write(client, 0x04, (u8) 0x00);
 171         cs53l32a_write(client, 0x05, (u8) 0x00);
 172         cs53l32a_write(client, 0x06, (u8) 0x00);
 173         cs53l32a_write(client, 0x07, (u8) 0x00);
 174
 175         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 176
 177         for (i = 1; i <= 7; i++) {
 178                 u8 v = cs53l32a_read(client, i);
 179
 180                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 181         }
 182
 183         i2c_attach_client(client);
 184
 185         return 0;
 186 }
 187
 188 static int cs53l32a_probe(struct i2c_adapter *adapter)
 189 {
 190         if (adapter->class & I2C_CLASS_TV_ANALOG)
 191                 return i2c_probe(adapter, &addr_data, cs53l32a_attach);
 192         return 0;
 193 }
 194
 195 static int cs53l32a_detach(struct i2c_client *client)
 196 {
 197         int err;
 198
 199         err = i2c_detach_client(client);
 200         if (err) {
 201                 return err;
 202         }
 203         kfree(client);
 204
 205         return 0;
 206 }
 207
 208 /* ----------------------------------------------------------------------- */
 209
 210 /* i2c implementation */
 211 static struct i2c_driver i2c_driver = {
 212         .driver = {
 213                 .name = "cs53l32a",
 214         },
 215         .id = I2C_DRIVERID_CS53L32A,
 216         .attach_adapter = cs53l32a_probe,
 217         .detach_client = cs53l32a_detach,
 218         .command = cs53l32a_command,
 219 };
 220
 221
 222 static int __init cs53l32a_init_module(void)
 223 {
 224         return i2c_add_driver(&i2c_driver);
 225 }
 226
 227 static void __exit cs53l32a_cleanup_module(void)
 228 {
 229         i2c_del_driver(&i2c_driver);
 230 }
 231
 232 module_init(cs53l32a_init_module);
 233 module_exit(cs53l32a_cleanup_module);