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  1. /*
  2.  * MIPI DSI Bus
  3.  *
  4.  * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
  5.  * Andrzej Hajda <a.hajda@samsung.com>
  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 version 2 as
  9.  * published by the Free Software Foundation.
  10.  */
  11.  
  12. #ifndef __DRM_MIPI_DSI_H__
  13. #define __DRM_MIPI_DSI_H__
  14.  
  15. #include <linux/device.h>
  16.  
  17. struct mipi_dsi_host;
  18. struct mipi_dsi_device;
  19.  
  20. /* request ACK from peripheral */
  21. #define MIPI_DSI_MSG_REQ_ACK    BIT(0)
  22. /* use Low Power Mode to transmit message */
  23. #define MIPI_DSI_MSG_USE_LPM    BIT(1)
  24.  
  25. /**
  26.  * struct mipi_dsi_msg - read/write DSI buffer
  27.  * @channel: virtual channel id
  28.  * @type: payload data type
  29.  * @flags: flags controlling this message transmission
  30.  * @tx_len: length of @tx_buf
  31.  * @tx_buf: data to be written
  32.  * @rx_len: length of @rx_buf
  33.  * @rx_buf: data to be read, or NULL
  34.  */
  35. struct mipi_dsi_msg {
  36.         u8 channel;
  37.         u8 type;
  38.         u16 flags;
  39.  
  40.         size_t tx_len;
  41.         const void *tx_buf;
  42.  
  43.         size_t rx_len;
  44.         void *rx_buf;
  45. };
  46.  
  47. bool mipi_dsi_packet_format_is_short(u8 type);
  48. bool mipi_dsi_packet_format_is_long(u8 type);
  49.  
  50. /**
  51.  * struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format
  52.  * @size: size (in bytes) of the packet
  53.  * @header: the four bytes that make up the header (Data ID, Word Count or
  54.  *     Packet Data, and ECC)
  55.  * @payload_length: number of bytes in the payload
  56.  * @payload: a pointer to a buffer containing the payload, if any
  57.  */
  58. struct mipi_dsi_packet {
  59.         size_t size;
  60.         u8 header[4];
  61.         size_t payload_length;
  62.         const u8 *payload;
  63. };
  64.  
  65. int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
  66.                            const struct mipi_dsi_msg *msg);
  67.  
  68. /**
  69.  * struct mipi_dsi_host_ops - DSI bus operations
  70.  * @attach: attach DSI device to DSI host
  71.  * @detach: detach DSI device from DSI host
  72.  * @transfer: transmit a DSI packet
  73.  *
  74.  * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
  75.  * structures. This structure contains information about the type of packet
  76.  * being transmitted as well as the transmit and receive buffers. When an
  77.  * error is encountered during transmission, this function will return a
  78.  * negative error code. On success it shall return the number of bytes
  79.  * transmitted for write packets or the number of bytes received for read
  80.  * packets.
  81.  *
  82.  * Note that typically DSI packet transmission is atomic, so the .transfer()
  83.  * function will seldomly return anything other than the number of bytes
  84.  * contained in the transmit buffer on success.
  85.  */
  86. struct mipi_dsi_host_ops {
  87.         int (*attach)(struct mipi_dsi_host *host,
  88.                       struct mipi_dsi_device *dsi);
  89.         int (*detach)(struct mipi_dsi_host *host,
  90.                       struct mipi_dsi_device *dsi);
  91.         ssize_t (*transfer)(struct mipi_dsi_host *host,
  92.                             const struct mipi_dsi_msg *msg);
  93. };
  94.  
  95. /**
  96.  * struct mipi_dsi_host - DSI host device
  97.  * @dev: driver model device node for this DSI host
  98.  * @ops: DSI host operations
  99.  */
  100. struct mipi_dsi_host {
  101.         struct device *dev;
  102.         const struct mipi_dsi_host_ops *ops;
  103. };
  104.  
  105. int mipi_dsi_host_register(struct mipi_dsi_host *host);
  106. void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
  107.  
  108. /* DSI mode flags */
  109.  
  110. /* video mode */
  111. #define MIPI_DSI_MODE_VIDEO             BIT(0)
  112. /* video burst mode */
  113. #define MIPI_DSI_MODE_VIDEO_BURST       BIT(1)
  114. /* video pulse mode */
  115. #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE  BIT(2)
  116. /* enable auto vertical count mode */
  117. #define MIPI_DSI_MODE_VIDEO_AUTO_VERT   BIT(3)
  118. /* enable hsync-end packets in vsync-pulse and v-porch area */
  119. #define MIPI_DSI_MODE_VIDEO_HSE         BIT(4)
  120. /* disable hfront-porch area */
  121. #define MIPI_DSI_MODE_VIDEO_HFP         BIT(5)
  122. /* disable hback-porch area */
  123. #define MIPI_DSI_MODE_VIDEO_HBP         BIT(6)
  124. /* disable hsync-active area */
  125. #define MIPI_DSI_MODE_VIDEO_HSA         BIT(7)
  126. /* flush display FIFO on vsync pulse */
  127. #define MIPI_DSI_MODE_VSYNC_FLUSH       BIT(8)
  128. /* disable EoT packets in HS mode */
  129. #define MIPI_DSI_MODE_EOT_PACKET        BIT(9)
  130. /* device supports non-continuous clock behavior (DSI spec 5.6.1) */
  131. #define MIPI_DSI_CLOCK_NON_CONTINUOUS   BIT(10)
  132. /* transmit data in low power */
  133. #define MIPI_DSI_MODE_LPM               BIT(11)
  134.  
  135. enum mipi_dsi_pixel_format {
  136.         MIPI_DSI_FMT_RGB888,
  137.         MIPI_DSI_FMT_RGB666,
  138.         MIPI_DSI_FMT_RGB666_PACKED,
  139.         MIPI_DSI_FMT_RGB565,
  140. };
  141.  
  142. /**
  143.  * struct mipi_dsi_device - DSI peripheral device
  144.  * @host: DSI host for this peripheral
  145.  * @dev: driver model device node for this peripheral
  146.  * @channel: virtual channel assigned to the peripheral
  147.  * @format: pixel format for video mode
  148.  * @lanes: number of active data lanes
  149.  * @mode_flags: DSI operation mode related flags
  150.  */
  151. struct mipi_dsi_device {
  152.         struct mipi_dsi_host *host;
  153.         struct device dev;
  154.  
  155.         unsigned int channel;
  156.         unsigned int lanes;
  157.         enum mipi_dsi_pixel_format format;
  158.         unsigned long mode_flags;
  159. };
  160.  
  161. static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
  162. {
  163.         return container_of(dev, struct mipi_dsi_device, dev);
  164. }
  165.  
  166. /**
  167.  * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
  168.  *                                given pixel format defined by the MIPI DSI
  169.  *                                specification
  170.  * @fmt: MIPI DSI pixel format
  171.  *
  172.  * Returns: The number of bits per pixel of the given pixel format.
  173.  */
  174. static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
  175. {
  176.         switch (fmt) {
  177.         case MIPI_DSI_FMT_RGB888:
  178.         case MIPI_DSI_FMT_RGB666:
  179.                 return 24;
  180.  
  181.         case MIPI_DSI_FMT_RGB666_PACKED:
  182.                 return 18;
  183.  
  184.         case MIPI_DSI_FMT_RGB565:
  185.                 return 16;
  186.         }
  187.  
  188.         return -EINVAL;
  189. }
  190.  
  191. struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
  192. int mipi_dsi_attach(struct mipi_dsi_device *dsi);
  193. int mipi_dsi_detach(struct mipi_dsi_device *dsi);
  194. int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
  195. int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
  196. int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
  197.                                             u16 value);
  198.  
  199. ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
  200.                                size_t size);
  201. ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
  202.                               size_t num_params, void *data, size_t size);
  203.  
  204. /**
  205.  * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
  206.  * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
  207.  *    information only
  208.  * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
  209.  *    V-Blanking and H-Blanking information
  210.  */
  211. enum mipi_dsi_dcs_tear_mode {
  212.         MIPI_DSI_DCS_TEAR_MODE_VBLANK,
  213.         MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
  214. };
  215.  
  216. #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
  217. #define MIPI_DSI_DCS_POWER_MODE_NORMAL  (1 << 3)
  218. #define MIPI_DSI_DCS_POWER_MODE_SLEEP   (1 << 4)
  219. #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
  220. #define MIPI_DSI_DCS_POWER_MODE_IDLE    (1 << 6)
  221.  
  222. ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
  223.                                   const void *data, size_t len);
  224. ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
  225.                            const void *data, size_t len);
  226. ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
  227.                           size_t len);
  228. int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
  229. int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
  230. int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
  231. int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
  232. int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
  233. int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
  234. int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
  235. int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
  236. int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
  237.                                     u16 end);
  238. int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
  239.                                   u16 end);
  240. int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
  241. int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
  242.                              enum mipi_dsi_dcs_tear_mode mode);
  243. int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
  244.  
  245. /**
  246.  * struct mipi_dsi_driver - DSI driver
  247.  * @driver: device driver model driver
  248.  * @probe: callback for device binding
  249.  * @remove: callback for device unbinding
  250.  * @shutdown: called at shutdown time to quiesce the device
  251.  */
  252. struct mipi_dsi_driver {
  253.         struct device_driver driver;
  254.         int(*probe)(struct mipi_dsi_device *dsi);
  255.         int(*remove)(struct mipi_dsi_device *dsi);
  256.         void (*shutdown)(struct mipi_dsi_device *dsi);
  257. };
  258.  
  259. static inline struct mipi_dsi_driver *
  260. to_mipi_dsi_driver(struct device_driver *driver)
  261. {
  262.         return container_of(driver, struct mipi_dsi_driver, driver);
  263. }
  264.  
  265. static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
  266. {
  267.         return dev_get_drvdata(&dsi->dev);
  268. }
  269.  
  270. static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
  271. {
  272.         dev_set_drvdata(&dsi->dev, data);
  273. }
  274.  
  275. int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
  276.                                   struct module *owner);
  277. void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
  278.  
  279. #define mipi_dsi_driver_register(driver) \
  280.         mipi_dsi_driver_register_full(driver, THIS_MODULE)
  281.  
  282. #define module_mipi_dsi_driver(__mipi_dsi_driver) \
  283.         module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
  284.                         mipi_dsi_driver_unregister)
  285.  
  286. #endif /* __DRM_MIPI_DSI__ */
  287.