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  */
 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__ */