tlv320aic23b.c 5.8 KB

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  1. /*
  2. * tlv320aic23b - driver version 0.0.1
  3. *
  4. * Copyright (C) 2006 Scott Alfter <salfter@ssai.us>
  5. *
  6. * Based on wm8775 driver
  7. *
  8. * Copyright (C) 2004 Ulf Eklund <ivtv at eklund.to>
  9. * Copyright (C) 2005 Hans Verkuil <hverkuil@xs4all.nl>
  10. *
  11. * This program is free software; you can redistribute it and/or modify
  12. * it under the terms of the GNU General Public License as published by
  13. * the Free Software Foundation; either version 2 of the License, or
  14. * (at your option) any later version.
  15. *
  16. * This program is distributed in the hope that it will be useful,
  17. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  19. * GNU General Public License for more details.
  20. *
  21. * You should have received a copy of the GNU General Public License
  22. * along with this program; if not, write to the Free Software
  23. * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24. */
  25. #include <linux/module.h>
  26. #include <linux/types.h>
  27. #include <linux/ioctl.h>
  28. #include <asm/uaccess.h>
  29. #include <linux/i2c.h>
  30. #include <linux/i2c-id.h>
  31. #include <linux/videodev2.h>
  32. #include <media/v4l2-device.h>
  33. #include <media/v4l2-i2c-drv-legacy.h>
  34. MODULE_DESCRIPTION("tlv320aic23b driver");
  35. MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  36. MODULE_LICENSE("GPL");
  37. static unsigned short normal_i2c[] = { 0x34 >> 1, I2C_CLIENT_END };
  38. I2C_CLIENT_INSMOD;
  39. /* ----------------------------------------------------------------------- */
  40. struct tlv320aic23b_state {
  41. struct v4l2_subdev sd;
  42. u8 muted;
  43. };
  44. static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  45. {
  46. return container_of(sd, struct tlv320aic23b_state, sd);
  47. }
  48. static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  49. {
  50. struct i2c_client *client = v4l2_get_subdevdata(sd);
  51. int i;
  52. if ((reg < 0 || reg > 9) && (reg != 15)) {
  53. v4l2_err(sd, "Invalid register R%d\n", reg);
  54. return -1;
  55. }
  56. for (i = 0; i < 3; i++)
  57. if (i2c_smbus_write_byte_data(client,
  58. (reg << 1) | (val >> 8), val & 0xff) == 0)
  59. return 0;
  60. v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  61. return -1;
  62. }
  63. static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  64. {
  65. switch (freq) {
  66. case 32000: /* set sample rate to 32 kHz */
  67. tlv320aic23b_write(sd, 8, 0x018);
  68. break;
  69. case 44100: /* set sample rate to 44.1 kHz */
  70. tlv320aic23b_write(sd, 8, 0x022);
  71. break;
  72. case 48000: /* set sample rate to 48 kHz */
  73. tlv320aic23b_write(sd, 8, 0x000);
  74. break;
  75. default:
  76. return -EINVAL;
  77. }
  78. return 0;
  79. }
  80. static int tlv320aic23b_g_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  81. {
  82. struct tlv320aic23b_state *state = to_state(sd);
  83. if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  84. return -EINVAL;
  85. ctrl->value = state->muted;
  86. return 0;
  87. }
  88. static int tlv320aic23b_s_ctrl(struct v4l2_subdev *sd, struct v4l2_control *ctrl)
  89. {
  90. struct tlv320aic23b_state *state = to_state(sd);
  91. if (ctrl->id != V4L2_CID_AUDIO_MUTE)
  92. return -EINVAL;
  93. state->muted = ctrl->value;
  94. tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
  95. /* set gain on both channels to +3.0 dB */
  96. if (!state->muted)
  97. tlv320aic23b_write(sd, 0, 0x119);
  98. return 0;
  99. }
  100. static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
  101. {
  102. struct tlv320aic23b_state *state = to_state(sd);
  103. v4l2_info(sd, "Input: %s\n", state->muted ? "muted" : "active");
  104. return 0;
  105. }
  106. static int tlv320aic23b_command(struct i2c_client *client, unsigned cmd, void *arg)
  107. {
  108. return v4l2_subdev_command(i2c_get_clientdata(client), cmd, arg);
  109. }
  110. /* ----------------------------------------------------------------------- */
  111. static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
  112. .log_status = tlv320aic23b_log_status,
  113. .g_ctrl = tlv320aic23b_g_ctrl,
  114. .s_ctrl = tlv320aic23b_s_ctrl,
  115. };
  116. static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
  117. .s_clock_freq = tlv320aic23b_s_clock_freq,
  118. };
  119. static const struct v4l2_subdev_ops tlv320aic23b_ops = {
  120. .core = &tlv320aic23b_core_ops,
  121. .audio = &tlv320aic23b_audio_ops,
  122. };
  123. /* ----------------------------------------------------------------------- */
  124. /* i2c implementation */
  125. /*
  126. * Generic i2c probe
  127. * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
  128. */
  129. static int tlv320aic23b_probe(struct i2c_client *client,
  130. const struct i2c_device_id *id)
  131. {
  132. struct tlv320aic23b_state *state;
  133. struct v4l2_subdev *sd;
  134. /* Check if the adapter supports the needed features */
  135. if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  136. return -EIO;
  137. v4l_info(client, "chip found @ 0x%x (%s)\n",
  138. client->addr << 1, client->adapter->name);
  139. state = kzalloc(sizeof(struct tlv320aic23b_state), GFP_KERNEL);
  140. if (state == NULL)
  141. return -ENOMEM;
  142. sd = &state->sd;
  143. v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
  144. state->muted = 0;
  145. /* Initialize tlv320aic23b */
  146. /* RESET */
  147. tlv320aic23b_write(sd, 15, 0x000);
  148. /* turn off DAC & mic input */
  149. tlv320aic23b_write(sd, 6, 0x00A);
  150. /* left-justified, 24-bit, master mode */
  151. tlv320aic23b_write(sd, 7, 0x049);
  152. /* set gain on both channels to +3.0 dB */
  153. tlv320aic23b_write(sd, 0, 0x119);
  154. /* set sample rate to 48 kHz */
  155. tlv320aic23b_write(sd, 8, 0x000);
  156. /* activate digital interface */
  157. tlv320aic23b_write(sd, 9, 0x001);
  158. return 0;
  159. }
  160. static int tlv320aic23b_remove(struct i2c_client *client)
  161. {
  162. struct v4l2_subdev *sd = i2c_get_clientdata(client);
  163. v4l2_device_unregister_subdev(sd);
  164. kfree(to_state(sd));
  165. return 0;
  166. }
  167. /* ----------------------------------------------------------------------- */
  168. static const struct i2c_device_id tlv320aic23b_id[] = {
  169. { "tlv320aic23b", 0 },
  170. { }
  171. };
  172. MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
  173. static struct v4l2_i2c_driver_data v4l2_i2c_data = {
  174. .name = "tlv320aic23b",
  175. .driverid = I2C_DRIVERID_TLV320AIC23B,
  176. .command = tlv320aic23b_command,
  177. .probe = tlv320aic23b_probe,
  178. .remove = tlv320aic23b_remove,
  179. .id_table = tlv320aic23b_id,
  180. };