drm_encoder_slave.c 5.4 KB

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  1. /*
  2. * Copyright (C) 2009 Francisco Jerez.
  3. * All Rights Reserved.
  4. *
  5. * Permission is hereby granted, free of charge, to any person obtaining
  6. * a copy of this software and associated documentation files (the
  7. * "Software"), to deal in the Software without restriction, including
  8. * without limitation the rights to use, copy, modify, merge, publish,
  9. * distribute, sublicense, and/or sell copies of the Software, and to
  10. * permit persons to whom the Software is furnished to do so, subject to
  11. * the following conditions:
  12. *
  13. * The above copyright notice and this permission notice (including the
  14. * next paragraph) shall be included in all copies or substantial
  15. * portions of the Software.
  16. *
  17. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  18. * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19. * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20. * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
  21. * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  22. * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  23. * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24. *
  25. */
  26. #include <linux/module.h>
  27. #include <drm/drm_encoder_slave.h>
  28. /**
  29. * drm_i2c_encoder_init - Initialize an I2C slave encoder
  30. * @dev: DRM device.
  31. * @encoder: Encoder to be attached to the I2C device. You aren't
  32. * required to have called drm_encoder_init() before.
  33. * @adap: I2C adapter that will be used to communicate with
  34. * the device.
  35. * @info: Information that will be used to create the I2C device.
  36. * Required fields are @addr and @type.
  37. *
  38. * Create an I2C device on the specified bus (the module containing its
  39. * driver is transparently loaded) and attach it to the specified
  40. * &drm_encoder_slave. The @slave_funcs field will be initialized with
  41. * the hooks provided by the slave driver.
  42. *
  43. * If @info.platform_data is non-NULL it will be used as the initial
  44. * slave config.
  45. *
  46. * Returns 0 on success or a negative errno on failure, in particular,
  47. * -ENODEV is returned when no matching driver is found.
  48. */
  49. int drm_i2c_encoder_init(struct drm_device *dev,
  50. struct drm_encoder_slave *encoder,
  51. struct i2c_adapter *adap,
  52. const struct i2c_board_info *info)
  53. {
  54. struct module *module = NULL;
  55. struct i2c_client *client;
  56. struct drm_i2c_encoder_driver *encoder_drv;
  57. int err = 0;
  58. request_module("%s%s", I2C_MODULE_PREFIX, info->type);
  59. client = i2c_new_client_device(adap, info);
  60. if (!i2c_client_has_driver(client)) {
  61. err = -ENODEV;
  62. goto fail_unregister;
  63. }
  64. module = client->dev.driver->owner;
  65. if (!try_module_get(module)) {
  66. err = -ENODEV;
  67. goto fail_unregister;
  68. }
  69. encoder->bus_priv = client;
  70. encoder_drv = to_drm_i2c_encoder_driver(to_i2c_driver(client->dev.driver));
  71. err = encoder_drv->encoder_init(client, dev, encoder);
  72. if (err)
  73. goto fail_module_put;
  74. if (info->platform_data)
  75. encoder->slave_funcs->set_config(&encoder->base,
  76. info->platform_data);
  77. return 0;
  78. fail_module_put:
  79. module_put(module);
  80. fail_unregister:
  81. i2c_unregister_device(client);
  82. return err;
  83. }
  84. EXPORT_SYMBOL(drm_i2c_encoder_init);
  85. /**
  86. * drm_i2c_encoder_destroy - Unregister the I2C device backing an encoder
  87. * @drm_encoder: Encoder to be unregistered.
  88. *
  89. * This should be called from the @destroy method of an I2C slave
  90. * encoder driver once I2C access is no longer needed.
  91. */
  92. void drm_i2c_encoder_destroy(struct drm_encoder *drm_encoder)
  93. {
  94. struct drm_encoder_slave *encoder = to_encoder_slave(drm_encoder);
  95. struct i2c_client *client = drm_i2c_encoder_get_client(drm_encoder);
  96. struct module *module = client->dev.driver->owner;
  97. i2c_unregister_device(client);
  98. encoder->bus_priv = NULL;
  99. module_put(module);
  100. }
  101. EXPORT_SYMBOL(drm_i2c_encoder_destroy);
  102. /*
  103. * Wrapper fxns which can be plugged in to drm_encoder_helper_funcs:
  104. */
  105. static inline const struct drm_encoder_slave_funcs *
  106. get_slave_funcs(struct drm_encoder *enc)
  107. {
  108. return to_encoder_slave(enc)->slave_funcs;
  109. }
  110. void drm_i2c_encoder_dpms(struct drm_encoder *encoder, int mode)
  111. {
  112. get_slave_funcs(encoder)->dpms(encoder, mode);
  113. }
  114. EXPORT_SYMBOL(drm_i2c_encoder_dpms);
  115. bool drm_i2c_encoder_mode_fixup(struct drm_encoder *encoder,
  116. const struct drm_display_mode *mode,
  117. struct drm_display_mode *adjusted_mode)
  118. {
  119. if (!get_slave_funcs(encoder)->mode_fixup)
  120. return true;
  121. return get_slave_funcs(encoder)->mode_fixup(encoder, mode, adjusted_mode);
  122. }
  123. EXPORT_SYMBOL(drm_i2c_encoder_mode_fixup);
  124. void drm_i2c_encoder_prepare(struct drm_encoder *encoder)
  125. {
  126. drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
  127. }
  128. EXPORT_SYMBOL(drm_i2c_encoder_prepare);
  129. void drm_i2c_encoder_commit(struct drm_encoder *encoder)
  130. {
  131. drm_i2c_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
  132. }
  133. EXPORT_SYMBOL(drm_i2c_encoder_commit);
  134. void drm_i2c_encoder_mode_set(struct drm_encoder *encoder,
  135. struct drm_display_mode *mode,
  136. struct drm_display_mode *adjusted_mode)
  137. {
  138. get_slave_funcs(encoder)->mode_set(encoder, mode, adjusted_mode);
  139. }
  140. EXPORT_SYMBOL(drm_i2c_encoder_mode_set);
  141. enum drm_connector_status drm_i2c_encoder_detect(struct drm_encoder *encoder,
  142. struct drm_connector *connector)
  143. {
  144. return get_slave_funcs(encoder)->detect(encoder, connector);
  145. }
  146. EXPORT_SYMBOL(drm_i2c_encoder_detect);
  147. void drm_i2c_encoder_save(struct drm_encoder *encoder)
  148. {
  149. get_slave_funcs(encoder)->save(encoder);
  150. }
  151. EXPORT_SYMBOL(drm_i2c_encoder_save);
  152. void drm_i2c_encoder_restore(struct drm_encoder *encoder)
  153. {
  154. get_slave_funcs(encoder)->restore(encoder);
  155. }
  156. EXPORT_SYMBOL(drm_i2c_encoder_restore);