drivers/media/i2c/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/slab.h>
  26 #include <linux/ioctl.h>
  27 #include <asm/uaccess.h>
  28 #include <linux/i2c.h>
  29 #include <linux/videodev2.h>
  30 #include <media/v4l2-device.h>
  31 #include <media/v4l2-chip-ident.h>
  32 #include <media/v4l2-ctrls.h>
  33
  34 MODULE_DESCRIPTION("i2c device driver for cs53l32a Audio ADC");
  35 MODULE_AUTHOR("Martin Vaughan");
  36 MODULE_LICENSE("GPL");
  37
  38 static bool debug;
  39
  40 module_param(debug, bool, 0644);
  41
  42 MODULE_PARM_DESC(debug, "Debugging messages, 0=Off (default), 1=On");
  43
  44
  45 struct cs53l32a_state {
  46         struct v4l2_subdev sd;
  47         struct v4l2_ctrl_handler hdl;
  48 };
  49
  50 static inline struct cs53l32a_state *to_state(struct v4l2_subdev *sd)
  51 {
  52         return container_of(sd, struct cs53l32a_state, sd);
  53 }
  54
  55 static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  56 {
  57         return &container_of(ctrl->handler, struct cs53l32a_state, hdl)->sd;
  58 }
  59
  60 /* ----------------------------------------------------------------------- */
  61
  62 static int cs53l32a_write(struct v4l2_subdev *sd, u8 reg, u8 value)
  63 {
  64         struct i2c_client *client = v4l2_get_subdevdata(sd);
  65
  66         return i2c_smbus_write_byte_data(client, reg, value);
  67 }
  68
  69 static int cs53l32a_read(struct v4l2_subdev *sd, u8 reg)
  70 {
  71         struct i2c_client *client = v4l2_get_subdevdata(sd);
  72
  73         return i2c_smbus_read_byte_data(client, reg);
  74 }
  75
  76 static int cs53l32a_s_routing(struct v4l2_subdev *sd,
  77                               u32 input, u32 output, u32 config)
  78 {
  79         /* There are 2 physical inputs, but the second input can be
  80            placed in two modes, the first mode bypasses the PGA (gain),
  81            the second goes through the PGA. Hence there are three
  82            possible inputs to choose from. */
  83         if (input > 2) {
  84                 v4l2_err(sd, "Invalid input %d.\n", input);
  85                 return -EINVAL;
  86         }
  87         cs53l32a_write(sd, 0x01, 0x01 + (input << 4));
  88         return 0;
  89 }
  90
  91 static int cs53l32a_s_ctrl(struct v4l2_ctrl *ctrl)
  92 {
  93         struct v4l2_subdev *sd = to_sd(ctrl);
  94
  95         switch (ctrl->id) {
  96         case V4L2_CID_AUDIO_MUTE:
  97                 cs53l32a_write(sd, 0x03, ctrl->val ? 0xf0 : 0x30);
  98                 return 0;
  99         case V4L2_CID_AUDIO_VOLUME:
 100                 cs53l32a_write(sd, 0x04, (u8)ctrl->val);
 101                 cs53l32a_write(sd, 0x05, (u8)ctrl->val);
 102                 return 0;
 103         }
 104         return -EINVAL;
 105 }
 106
 107 static int cs53l32a_g_chip_ident(struct v4l2_subdev *sd, struct v4l2_dbg_chip_ident *chip)
 108 {
 109         struct i2c_client *client = v4l2_get_subdevdata(sd);
 110
 111         return v4l2_chip_ident_i2c_client(client,
 112                         chip, V4L2_IDENT_CS53l32A, 0);
 113 }
 114
 115 static int cs53l32a_log_status(struct v4l2_subdev *sd)
 116 {
 117         struct cs53l32a_state *state = to_state(sd);
 118         u8 v = cs53l32a_read(sd, 0x01);
 119
 120         v4l2_info(sd, "Input:  %d\n", (v >> 4) & 3);
 121         v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
 122         return 0;
 123 }
 124
 125 /* ----------------------------------------------------------------------- */
 126
 127 static const struct v4l2_ctrl_ops cs53l32a_ctrl_ops = {
 128         .s_ctrl = cs53l32a_s_ctrl,
 129 };
 130
 131 static const struct v4l2_subdev_core_ops cs53l32a_core_ops = {
 132         .log_status = cs53l32a_log_status,
 133         .g_chip_ident = cs53l32a_g_chip_ident,
 134         .g_ext_ctrls = v4l2_subdev_g_ext_ctrls,
 135         .try_ext_ctrls = v4l2_subdev_try_ext_ctrls,
 136         .s_ext_ctrls = v4l2_subdev_s_ext_ctrls,
 137         .g_ctrl = v4l2_subdev_g_ctrl,
 138         .s_ctrl = v4l2_subdev_s_ctrl,
 139         .queryctrl = v4l2_subdev_queryctrl,
 140         .querymenu = v4l2_subdev_querymenu,
 141 };
 142
 143 static const struct v4l2_subdev_audio_ops cs53l32a_audio_ops = {
 144         .s_routing = cs53l32a_s_routing,
 145 };
 146
 147 static const struct v4l2_subdev_ops cs53l32a_ops = {
 148         .core = &cs53l32a_core_ops,
 149         .audio = &cs53l32a_audio_ops,
 150 };
 151
 152 /* ----------------------------------------------------------------------- */
 153
 154 /* i2c implementation */
 155
 156 /*
 157  * Generic i2c probe
 158  * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
 159  */
 160
 161 static int cs53l32a_probe(struct i2c_client *client,
 162                           const struct i2c_device_id *id)
 163 {
 164         struct cs53l32a_state *state;
 165         struct v4l2_subdev *sd;
 166         int i;
 167
 168         /* Check if the adapter supports the needed features */
 169         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 170                 return -EIO;
 171
 172         if (!id)
 173                 strlcpy(client->name, "cs53l32a", sizeof(client->name));
 174
 175         v4l_info(client, "chip found @ 0x%x (%s)\n",
 176                         client->addr << 1, client->adapter->name);
 177
 178         state = kzalloc(sizeof(struct cs53l32a_state), GFP_KERNEL);
 179         if (state == NULL)
 180                 return -ENOMEM;
 181         sd = &state->sd;
 182         v4l2_i2c_subdev_init(sd, client, &cs53l32a_ops);
 183
 184         for (i = 1; i <= 7; i++) {
 185                 u8 v = cs53l32a_read(sd, i);
 186
 187                 v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
 188         }
 189
 190         v4l2_ctrl_handler_init(&state->hdl, 2);
 191         v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
 192                         V4L2_CID_AUDIO_VOLUME, -96, 12, 1, 0);
 193         v4l2_ctrl_new_std(&state->hdl, &cs53l32a_ctrl_ops,
 194                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
 195         sd->ctrl_handler = &state->hdl;
 196         if (state->hdl.error) {
 197                 int err = state->hdl.error;
 198
 199                 v4l2_ctrl_handler_free(&state->hdl);
 200                 kfree(state);
 201                 return err;
 202         }
 203
 204         /* Set cs53l32a internal register for Adaptec 2010/2410 setup */
 205
 206         cs53l32a_write(sd, 0x01, 0x21);
 207         cs53l32a_write(sd, 0x02, 0x29);
 208         cs53l32a_write(sd, 0x03, 0x30);
 209         cs53l32a_write(sd, 0x04, 0x00);
 210         cs53l32a_write(sd, 0x05, 0x00);
 211         cs53l32a_write(sd, 0x06, 0x00);
 212         cs53l32a_write(sd, 0x07, 0x00);
 213
 214         /* Display results, should be 0x21,0x29,0x30,0x00,0x00,0x00,0x00 */
 215
 216         for (i = 1; i <= 7; i++) {
 217                 u8 v = cs53l32a_read(sd, i);
 218
 219                 v4l2_dbg(1, debug, sd, "Read Reg %d %02x\n", i, v);
 220         }
 221         return 0;
 222 }
 223
 224 static int cs53l32a_remove(struct i2c_client *client)
 225 {
 226         struct v4l2_subdev *sd = i2c_get_clientdata(client);
 227         struct cs53l32a_state *state = to_state(sd);
 228
 229         v4l2_device_unregister_subdev(sd);
 230         v4l2_ctrl_handler_free(&state->hdl);
 231         kfree(state);
 232         return 0;
 233 }
 234
 235 static const struct i2c_device_id cs53l32a_id[] = {
 236         { "cs53l32a", 0 },
 237         { }
 238 };
 239 MODULE_DEVICE_TABLE(i2c, cs53l32a_id);
 240
 241 static struct i2c_driver cs53l32a_driver = {
 242         .driver = {
 243                 .owner  = THIS_MODULE,
 244                 .name   = "cs53l32a",
 245         },
 246         .probe          = cs53l32a_probe,
 247         .remove         = cs53l32a_remove,
 248         .id_table       = cs53l32a_id,
 249 };
 250
 251 module_i2c_driver(cs53l32a_driver);