tlv320aic23b.c 5.6 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. #include <linux/module.h>
  22. #include <linux/types.h>
  23. #include <linux/slab.h>
  24. #include <linux/ioctl.h>
  25. #include <linux/uaccess.h>
  26. #include <linux/i2c.h>
  27. #include <linux/videodev2.h>
  28. #include <media/v4l2-device.h>
  29. #include <media/v4l2-ctrls.h>
  30. MODULE_DESCRIPTION("tlv320aic23b driver");
  31. MODULE_AUTHOR("Scott Alfter, Ulf Eklund, Hans Verkuil");
  32. MODULE_LICENSE("GPL");
  33. /* ----------------------------------------------------------------------- */
  34. struct tlv320aic23b_state {
  35. struct v4l2_subdev sd;
  36. struct v4l2_ctrl_handler hdl;
  37. };
  38. static inline struct tlv320aic23b_state *to_state(struct v4l2_subdev *sd)
  39. {
  40. return container_of(sd, struct tlv320aic23b_state, sd);
  41. }
  42. static inline struct v4l2_subdev *to_sd(struct v4l2_ctrl *ctrl)
  43. {
  44. return &container_of(ctrl->handler, struct tlv320aic23b_state, hdl)->sd;
  45. }
  46. static int tlv320aic23b_write(struct v4l2_subdev *sd, int reg, u16 val)
  47. {
  48. struct i2c_client *client = v4l2_get_subdevdata(sd);
  49. int i;
  50. if ((reg < 0 || reg > 9) && (reg != 15)) {
  51. v4l2_err(sd, "Invalid register R%d\n", reg);
  52. return -1;
  53. }
  54. for (i = 0; i < 3; i++)
  55. if (i2c_smbus_write_byte_data(client,
  56. (reg << 1) | (val >> 8), val & 0xff) == 0)
  57. return 0;
  58. v4l2_err(sd, "I2C: cannot write %03x to register R%d\n", val, reg);
  59. return -1;
  60. }
  61. static int tlv320aic23b_s_clock_freq(struct v4l2_subdev *sd, u32 freq)
  62. {
  63. switch (freq) {
  64. case 32000: /* set sample rate to 32 kHz */
  65. tlv320aic23b_write(sd, 8, 0x018);
  66. break;
  67. case 44100: /* set sample rate to 44.1 kHz */
  68. tlv320aic23b_write(sd, 8, 0x022);
  69. break;
  70. case 48000: /* set sample rate to 48 kHz */
  71. tlv320aic23b_write(sd, 8, 0x000);
  72. break;
  73. default:
  74. return -EINVAL;
  75. }
  76. return 0;
  77. }
  78. static int tlv320aic23b_s_ctrl(struct v4l2_ctrl *ctrl)
  79. {
  80. struct v4l2_subdev *sd = to_sd(ctrl);
  81. switch (ctrl->id) {
  82. case V4L2_CID_AUDIO_MUTE:
  83. tlv320aic23b_write(sd, 0, 0x180); /* mute both channels */
  84. /* set gain on both channels to +3.0 dB */
  85. if (!ctrl->val)
  86. tlv320aic23b_write(sd, 0, 0x119);
  87. return 0;
  88. }
  89. return -EINVAL;
  90. }
  91. static int tlv320aic23b_log_status(struct v4l2_subdev *sd)
  92. {
  93. struct tlv320aic23b_state *state = to_state(sd);
  94. v4l2_ctrl_handler_log_status(&state->hdl, sd->name);
  95. return 0;
  96. }
  97. /* ----------------------------------------------------------------------- */
  98. static const struct v4l2_ctrl_ops tlv320aic23b_ctrl_ops = {
  99. .s_ctrl = tlv320aic23b_s_ctrl,
  100. };
  101. static const struct v4l2_subdev_core_ops tlv320aic23b_core_ops = {
  102. .log_status = tlv320aic23b_log_status,
  103. };
  104. static const struct v4l2_subdev_audio_ops tlv320aic23b_audio_ops = {
  105. .s_clock_freq = tlv320aic23b_s_clock_freq,
  106. };
  107. static const struct v4l2_subdev_ops tlv320aic23b_ops = {
  108. .core = &tlv320aic23b_core_ops,
  109. .audio = &tlv320aic23b_audio_ops,
  110. };
  111. /* ----------------------------------------------------------------------- */
  112. /* i2c implementation */
  113. /*
  114. * Generic i2c probe
  115. * concerning the addresses: i2c wants 7 bit (without the r/w bit), so '>>1'
  116. */
  117. static int tlv320aic23b_probe(struct i2c_client *client,
  118. const struct i2c_device_id *id)
  119. {
  120. struct tlv320aic23b_state *state;
  121. struct v4l2_subdev *sd;
  122. /* Check if the adapter supports the needed features */
  123. if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  124. return -EIO;
  125. v4l_info(client, "chip found @ 0x%x (%s)\n",
  126. client->addr << 1, client->adapter->name);
  127. state = devm_kzalloc(&client->dev, sizeof(*state), GFP_KERNEL);
  128. if (state == NULL)
  129. return -ENOMEM;
  130. sd = &state->sd;
  131. v4l2_i2c_subdev_init(sd, client, &tlv320aic23b_ops);
  132. /* Initialize tlv320aic23b */
  133. /* RESET */
  134. tlv320aic23b_write(sd, 15, 0x000);
  135. /* turn off DAC & mic input */
  136. tlv320aic23b_write(sd, 6, 0x00A);
  137. /* left-justified, 24-bit, master mode */
  138. tlv320aic23b_write(sd, 7, 0x049);
  139. /* set gain on both channels to +3.0 dB */
  140. tlv320aic23b_write(sd, 0, 0x119);
  141. /* set sample rate to 48 kHz */
  142. tlv320aic23b_write(sd, 8, 0x000);
  143. /* activate digital interface */
  144. tlv320aic23b_write(sd, 9, 0x001);
  145. v4l2_ctrl_handler_init(&state->hdl, 1);
  146. v4l2_ctrl_new_std(&state->hdl, &tlv320aic23b_ctrl_ops,
  147. V4L2_CID_AUDIO_MUTE, 0, 1, 1, 0);
  148. sd->ctrl_handler = &state->hdl;
  149. if (state->hdl.error) {
  150. int err = state->hdl.error;
  151. v4l2_ctrl_handler_free(&state->hdl);
  152. return err;
  153. }
  154. v4l2_ctrl_handler_setup(&state->hdl);
  155. return 0;
  156. }
  157. static int tlv320aic23b_remove(struct i2c_client *client)
  158. {
  159. struct v4l2_subdev *sd = i2c_get_clientdata(client);
  160. struct tlv320aic23b_state *state = to_state(sd);
  161. v4l2_device_unregister_subdev(sd);
  162. v4l2_ctrl_handler_free(&state->hdl);
  163. return 0;
  164. }
  165. /* ----------------------------------------------------------------------- */
  166. static const struct i2c_device_id tlv320aic23b_id[] = {
  167. { "tlv320aic23b", 0 },
  168. { }
  169. };
  170. MODULE_DEVICE_TABLE(i2c, tlv320aic23b_id);
  171. static struct i2c_driver tlv320aic23b_driver = {
  172. .driver = {
  173. .name = "tlv320aic23b",
  174. },
  175. .probe = tlv320aic23b_probe,
  176. .remove = tlv320aic23b_remove,
  177. .id_table = tlv320aic23b_id,
  178. };
  179. module_i2c_driver(tlv320aic23b_driver);