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_routing *route = arg;
  63         struct v4l2_control *ctrl = arg;
  64
  65         switch (cmd) {
  66         case VIDIOC_INT_G_AUDIO_ROUTING:
  67                 route->input = (cs53l32a_read(client, 0x01) >> 4) & 3;
  68                 route->output = 0;
  69                 break;
  70
  71         case VIDIOC_INT_S_AUDIO_ROUTING:
  72                 /* There are 2 physical inputs, but the second input can be
  73                    placed in two modes, the first mode bypasses the PGA (gain),
  74                    the second goes through the PGA. Hence there are three
  75                    possible inputs to choose from. */
  76                 if (route->input > 2) {
  77                         v4l_err(client, "Invalid input %d.\n", route->input);
  78                         return -EINVAL;
  79                 }
  80                 cs53l32a_write(client, 0x01, 0x01 + (route->input << 4));
  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 = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 145         if (client == 0)
 146                 return -ENOMEM;
 147
 148         client->addr = address;
 149         client->adapter = adapter;
 150         client->driver = &i2c_driver;
 151         snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");
 152
 153         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 154
 155         for (i = 1; i <= 7; i++) {
 156                 u8 v = cs53l32a_read(client, i);
 157
 158                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 159         }
 160
 161         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 162
 163         cs53l32a_write(client, 0x01, (u8) 0x21);
 164         cs53l32a_write(client, 0x02, (u8) 0x29);
 165         cs53l32a_write(client, 0x03, (u8) 0x30);
 166         cs53l32a_write(client, 0x04, (u8) 0x00);
 167         cs53l32a_write(client, 0x05, (u8) 0x00);
 168         cs53l32a_write(client, 0x06, (u8) 0x00);
 169         cs53l32a_write(client, 0x07, (u8) 0x00);
 170
 171         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 172
 173         for (i = 1; i <= 7; i++) {
 174                 u8 v = cs53l32a_read(client, i);
 175
 176                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 177         }
 178
 179         i2c_attach_client(client);
 180
 181         return 0;
 182 }
 183
 184 static int cs53l32a_probe(struct i2c_adapter *adapter)
 185 {
 186         if (adapter->class & I2C_CLASS_TV_ANALOG)
 187                 return i2c_probe(adapter, &addr_data, cs53l32a_attach);
 188         return 0;
 189 }
 190
 191 static int cs53l32a_detach(struct i2c_client *client)
 192 {
 193         int err;
 194
 195         err = i2c_detach_client(client);
 196         if (err) {
 197                 return err;
 198         }
 199         kfree(client);
 200
 201         return 0;
 202 }
 203
 204 /* ----------------------------------------------------------------------- */
 205
 206 /* i2c implementation */
 207 static struct i2c_driver i2c_driver = {
 208         .driver = {
 209                 .name = "cs53l32a",
 210         },
 211         .id = I2C_DRIVERID_CS53L32A,
 212         .attach_adapter = cs53l32a_probe,
 213         .detach_client = cs53l32a_detach,
 214         .command = cs53l32a_command,
 215 };
 216
 217
 218 static int __init cs53l32a_init_module(void)
 219 {
 220         return i2c_add_driver(&i2c_driver);
 221 }
 222
 223 static void __exit cs53l32a_cleanup_module(void)
 224 {
 225         i2c_del_driver(&i2c_driver);
 226 }
 227
 228 module_init(cs53l32a_init_module);
 229 module_exit(cs53l32a_cleanup_module);