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 #include <media/v4l2-i2c-drv-legacy.h>
  33
  34 MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
  35 MODULE_AUTHOR("Martin Vaughan");
  36 MODULE_LICENSE("GPL");
  37
  38 static int debug = 0;
  39
  40 module_param(debug, bool, 0644);
  41
  42 MODULE_PARM_DESC(debug, "Debugging messages\n\t\t\t0=Off (default), 1=On");
  43
  44 static unsigned short normal_i2c[] = { 0x22 >> 1, I2C_CLIENT_END };
  45
  46
  47 I2C_CLIENT_INSMOD;
  48
  49 /* ----------------------------------------------------------------------- */
  50
  51 static int cs53l32a_write(struct i2c_client *client, u8 reg, u8 value)
  52 {
  53         return i2c_smbus_write_byte_data(client, reg, value);
  54 }
  55
  56 static int cs53l32a_read(struct i2c_client *client, u8 reg)
  57 {
  58         return i2c_smbus_read_byte_data(client, reg);
  59 }
  60
  61 static int cs53l32a_command(struct i2c_client *client, unsigned int cmd, 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 int cs53l32a_probe(struct i2c_client *client)
 138 {
 139         int i;
 140
 141         /* Check if the adapter supports the needed features */
 142         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 143                 return -EIO;
 144
 145         snprintf(client->name, sizeof(client->name) - 1, "cs53l32a");
 146
 147         v4l_info(client, "chip found @ 0x%x (%s)\n", client->addr << 1, client->adapter->name);
 148
 149         for (i = 1; i <= 7; i++) {
 150                 u8 v = cs53l32a_read(client, i);
 151
 152                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 153         }
 154
 155         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 156
 157         cs53l32a_write(client, 0x01, (u8) 0x21);
 158         cs53l32a_write(client, 0x02, (u8) 0x29);
 159         cs53l32a_write(client, 0x03, (u8) 0x30);
 160         cs53l32a_write(client, 0x04, (u8) 0x00);
 161         cs53l32a_write(client, 0x05, (u8) 0x00);
 162         cs53l32a_write(client, 0x06, (u8) 0x00);
 163         cs53l32a_write(client, 0x07, (u8) 0x00);
 164
 165         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 166
 167         for (i = 1; i <= 7; i++) {
 168                 u8 v = cs53l32a_read(client, i);
 169
 170                 v4l_dbg(1, debug, client, "Read Reg %d %02x\n", i, v);
 171         }
 172         return 0;
 173 }
 174
 175 static struct v4l2_i2c_driver_data v4l2_i2c_data = {
 176         .name = "cs53l32a",
 177         .driverid = I2C_DRIVERID_CS53L32A,
 178         .command = cs53l32a_command,
 179         .probe = cs53l32a_probe,
 180 };
 181