include/drm/drm_mipi_dsi.h

   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  * @list: list management
 100  */
 101 struct mipi_dsi_host {
 102         struct device *dev;
 103         const struct mipi_dsi_host_ops *ops;
 104         struct list_head list;
 105 };
 106
 107 int mipi_dsi_host_register(struct mipi_dsi_host *host);
 108 void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
 109 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
 110
 111 /* DSI mode flags */
 112
 113 /* video mode */
 114 #define MIPI_DSI_MODE_VIDEO             BIT(0)
 115 /* video burst mode */
 116 #define MIPI_DSI_MODE_VIDEO_BURST       BIT(1)
 117 /* video pulse mode */
 118 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE  BIT(2)
 119 /* enable auto vertical count mode */
 120 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT   BIT(3)
 121 /* enable hsync-end packets in vsync-pulse and v-porch area */
 122 #define MIPI_DSI_MODE_VIDEO_HSE         BIT(4)
 123 /* disable hfront-porch area */
 124 #define MIPI_DSI_MODE_VIDEO_HFP         BIT(5)
 125 /* disable hback-porch area */
 126 #define MIPI_DSI_MODE_VIDEO_HBP         BIT(6)
 127 /* disable hsync-active area */
 128 #define MIPI_DSI_MODE_VIDEO_HSA         BIT(7)
 129 /* flush display FIFO on vsync pulse */
 130 #define MIPI_DSI_MODE_VSYNC_FLUSH       BIT(8)
 131 /* disable EoT packets in HS mode */
 132 #define MIPI_DSI_MODE_EOT_PACKET        BIT(9)
 133 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */
 134 #define MIPI_DSI_CLOCK_NON_CONTINUOUS   BIT(10)
 135 /* transmit data in low power */
 136 #define MIPI_DSI_MODE_LPM               BIT(11)
 137
 138 enum mipi_dsi_pixel_format {
 139         MIPI_DSI_FMT_RGB888,
 140         MIPI_DSI_FMT_RGB666,
 141         MIPI_DSI_FMT_RGB666_PACKED,
 142         MIPI_DSI_FMT_RGB565,
 143 };
 144
 145 #define DSI_DEV_NAME_SIZE               20
 146
 147 /**
 148  * struct mipi_dsi_device_info - template for creating a mipi_dsi_device
 149  * @type: DSI peripheral chip type
 150  * @channel: DSI virtual channel assigned to peripheral
 151  * @node: pointer to OF device node or NULL
 152  *
 153  * This is populated and passed to mipi_dsi_device_new to create a new
 154  * DSI device
 155  */
 156 struct mipi_dsi_device_info {
 157         char type[DSI_DEV_NAME_SIZE];
 158         u32 channel;
 159         struct device_node *node;
 160 };
 161
 162 /**
 163  * struct mipi_dsi_device - DSI peripheral device
 164  * @host: DSI host for this peripheral
 165  * @dev: driver model device node for this peripheral
 166  * @name: DSI peripheral chip type
 167  * @channel: virtual channel assigned to the peripheral
 168  * @format: pixel format for video mode
 169  * @lanes: number of active data lanes
 170  * @mode_flags: DSI operation mode related flags
 171  * @hs_rate: maximum lane frequency for high speed mode in hertz, this should
 172  * be set to the real limits of the hardware, zero is only accepted for
 173  * legacy drivers
 174  * @lp_rate: maximum lane frequency for low power mode in hertz, this should
 175  * be set to the real limits of the hardware, zero is only accepted for
 176  * legacy drivers
 177  */
 178 struct mipi_dsi_device {
 179         struct mipi_dsi_host *host;
 180         struct device dev;
 181
 182         char name[DSI_DEV_NAME_SIZE];
 183         unsigned int channel;
 184         unsigned int lanes;
 185         enum mipi_dsi_pixel_format format;
 186         unsigned long mode_flags;
 187         unsigned long hs_rate;
 188         unsigned long lp_rate;
 189 };
 190
 191 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
 192
 193 static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
 194 {
 195         return container_of(dev, struct mipi_dsi_device, dev);
 196 }
 197
 198 /**
 199  * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
 200  *                                given pixel format defined by the MIPI DSI
 201  *                                specification
 202  * @fmt: MIPI DSI pixel format
 203  *
 204  * Returns: The number of bits per pixel of the given pixel format.
 205  */
 206 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
 207 {
 208         switch (fmt) {
 209         case MIPI_DSI_FMT_RGB888:
 210         case MIPI_DSI_FMT_RGB666:
 211                 return 24;
 212
 213         case MIPI_DSI_FMT_RGB666_PACKED:
 214                 return 18;
 215
 216         case MIPI_DSI_FMT_RGB565:
 217                 return 16;
 218         }
 219
 220         return -EINVAL;
 221 }
 222
 223 struct mipi_dsi_device *
 224 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
 225                               const struct mipi_dsi_device_info *info);
 226 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
 227 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
 228 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
 229 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
 230 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
 231 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
 232 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 233                                             u16 value);
 234
 235 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
 236                                size_t size);
 237 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
 238                               size_t num_params, void *data, size_t size);
 239
 240 /**
 241  * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
 242  * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
 243  *    information only
 244  * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
 245  *    V-Blanking and H-Blanking information
 246  */
 247 enum mipi_dsi_dcs_tear_mode {
 248         MIPI_DSI_DCS_TEAR_MODE_VBLANK,
 249         MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
 250 };
 251
 252 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
 253 #define MIPI_DSI_DCS_POWER_MODE_NORMAL  (1 << 3)
 254 #define MIPI_DSI_DCS_POWER_MODE_SLEEP   (1 << 4)
 255 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
 256 #define MIPI_DSI_DCS_POWER_MODE_IDLE    (1 << 6)
 257
 258 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
 259                                   const void *data, size_t len);
 260 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
 261                            const void *data, size_t len);
 262 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
 263                           size_t len);
 264 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
 265 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
 266 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
 267 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
 268 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
 269 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
 270 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
 271 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
 272 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
 273                                     u16 end);
 274 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
 275                                   u16 end);
 276 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
 277 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
 278                              enum mipi_dsi_dcs_tear_mode mode);
 279 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
 280 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
 281 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
 282                                         u16 brightness);
 283 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
 284                                         u16 *brightness);
 285
 286 /**
 287  * struct mipi_dsi_driver - DSI driver
 288  * @driver: device driver model driver
 289  * @probe: callback for device binding
 290  * @remove: callback for device unbinding
 291  * @shutdown: called at shutdown time to quiesce the device
 292  */
 293 struct mipi_dsi_driver {
 294         struct device_driver driver;
 295         int(*probe)(struct mipi_dsi_device *dsi);
 296         int(*remove)(struct mipi_dsi_device *dsi);
 297         void (*shutdown)(struct mipi_dsi_device *dsi);
 298 };
 299
 300 static inline struct mipi_dsi_driver *
 301 to_mipi_dsi_driver(struct device_driver *driver)
 302 {
 303         return container_of(driver, struct mipi_dsi_driver, driver);
 304 }
 305
 306 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
 307 {
 308         return dev_get_drvdata(&dsi->dev);
 309 }
 310
 311 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
 312 {
 313         dev_set_drvdata(&dsi->dev, data);
 314 }
 315
 316 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
 317                                   struct module *owner);
 318 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
 319
 320 #define mipi_dsi_driver_register(driver) \
 321         mipi_dsi_driver_register_full(driver, THIS_MODULE)
 322
 323 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
 324         module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
 325                         mipi_dsi_driver_unregister)
 326
 327 #endif /* __DRM_MIPI_DSI__ */