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_CTRL:
  79                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  80                         ctrl->value = (cs53l32a_read(client, 0x03) & 0xc0) != 0;
  81                         break;
  82                 }
  83                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  84                         return -EINVAL;
  85                 ctrl->value = (s8)cs53l32a_read(client, 0x04);
  86                 break;
  87
  88         case VIDIOC_S_CTRL:
  89                 if (ctrl->id == V4L2_CID_AUDIO_MUTE) {
  90                         cs53l32a_write(client, 0x03, ctrl->value ? 0xf0 : 0x30);
  91                         break;
  92                 }
  93                 if (ctrl->id != V4L2_CID_AUDIO_VOLUME)
  94                         return -EINVAL;
  95                 if (ctrl->value > 12 || ctrl->value < -96)
  96                         return -EINVAL;
  97                 cs53l32a_write(client, 0x04, (u8) ctrl->value);
  98                 cs53l32a_write(client, 0x05, (u8) ctrl->value);
  99                 break;
 100
 101         case VIDIOC_LOG_STATUS:
 102                 {
 103                         u8 v = cs53l32a_read(client, 0x01);
 104                         u8 m = cs53l32a_read(client, 0x03);
 105                         s8 vol = cs53l32a_read(client, 0x04);
 106
 107                         v4l_info(client, "Input:  %d%s\n", (v >> 4) & 3,
 108                                       (m & 0xC0) ? " (muted)" : "");
 109                         v4l_info(client, "Volume: %d dB\n", vol);
 110                         break;
 111                 }
 112
 113         default:
 114                 return -EINVAL;
 115         }
 116         return 0;
 117 }
 118
 119 /* ----------------------------------------------------------------------- */
 120
 121 /* i2c implementation */
 122
 123 /*
 124  * Generic i2c probe
 125  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 126  */
 127
 128 static struct i2c_driver i2c_driver;
 129
 130 static int cs53l32a_attach(struct i2c_adapter *adapter, int address, int kind)
 131 {
 132         struct i2c_client *client;
 133         int i;
 134
 135         /* Check if the adapter supports the needed features */
 136         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 137                 return 0;
 138
 139         client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 140         if (client == 0)
 141                 return -ENOMEM;
 142
 143         client->addr = address;
 144         client->adapter = adapter;
 145         client->driver = &i2c_driver;
 146         snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");
 147
 148         v4l_info(client, "chip found @ 0x%x (%s)\n", address << 1, adapter->name);
 149
 150         for (i = 1; i <= 7; i++) {
 151                 u8 v = cs53l32a_read(client, i);
 152
 153                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 154         }
 155
 156         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 157
 158         cs53l32a_write(client, 0x01, (u8) 0x21);
 159         cs53l32a_write(client, 0x02, (u8) 0x29);
 160         cs53l32a_write(client, 0x03, (u8) 0x30);
 161         cs53l32a_write(client, 0x04, (u8) 0x00);
 162         cs53l32a_write(client, 0x05, (u8) 0x00);
 163         cs53l32a_write(client, 0x06, (u8) 0x00);
 164         cs53l32a_write(client, 0x07, (u8) 0x00);
 165
 166         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 167
 168         for (i = 1; i <= 7; i++) {
 169                 u8 v = cs53l32a_read(client, i);
 170
 171                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 172         }
 173
 174         i2c_attach_client(client);
 175
 176         return 0;
 177 }
 178
 179 static int cs53l32a_probe(struct i2c_adapter *adapter)
 180 {
 181         if (adapter->class & I2C_CLASS_TV_ANALOG)
 182                 return i2c_probe(adapter, &addr_data, cs53l32a_attach);
 183         return 0;
 184 }
 185
 186 static int cs53l32a_detach(struct i2c_client *client)
 187 {
 188         int err;
 189
 190         err = i2c_detach_client(client);
 191         if (err) {
 192                 return err;
 193         }
 194         kfree(client);
 195
 196         return 0;
 197 }
 198
 199 /* ----------------------------------------------------------------------- */
 200
 201 /* i2c implementation */
 202 static struct i2c_driver i2c_driver = {
 203         .driver = {
 204                 .name = "cs53l32a",
 205         },
 206         .id = I2C_DRIVERID_CS53L32A,
 207         .attach_adapter = cs53l32a_probe,
 208         .detach_client = cs53l32a_detach,
 209         .command = cs53l32a_command,
 210 };
 211
 212
 213 static int __init cs53l32a_init_module(void)
 214 {
 215         return i2c_add_driver(&i2c_driver);
 216 }
 217
 218 static void __exit cs53l32a_cleanup_module(void)
 219 {
 220         i2c_del_driver(&i2c_driver);
 221 }
 222
 223 module_init(cs53l32a_init_module);
 224 module_exit(cs53l32a_cleanup_module);