include/drm/drm_mipi_dsi.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * MIPI DSI Bus
   4  *
   5  * Copyright (C) 2012-2013, Samsung Electronics, Co., Ltd.
   6  * Andrzej Hajda <a.hajda@samsung.com>
   7  */
   8
   9 #ifndef __DRM_MIPI_DSI_H__
  10 #define __DRM_MIPI_DSI_H__
  11
  12 #include <linux/device.h>
  13
  14 struct mipi_dsi_host;
  15 struct mipi_dsi_device;
  16 struct drm_dsc_picture_parameter_set;
  17
  18 /* request ACK from peripheral */
  19 #define MIPI_DSI_MSG_REQ_ACK    BIT(0)
  20 /* use Low Power Mode to transmit message */
  21 #define MIPI_DSI_MSG_USE_LPM    BIT(1)
  22
  23 /**
  24  * struct mipi_dsi_msg - read/write DSI buffer
  25  * @channel: virtual channel id
  26  * @type: payload data type
  27  * @flags: flags controlling this message transmission
  28  * @tx_len: length of @tx_buf
  29  * @tx_buf: data to be written
  30  * @rx_len: length of @rx_buf
  31  * @rx_buf: data to be read, or NULL
  32  */
  33 struct mipi_dsi_msg {
  34         u8 channel;
  35         u8 type;
  36         u16 flags;
  37
  38         size_t tx_len;
  39         const void *tx_buf;
  40
  41         size_t rx_len;
  42         void *rx_buf;
  43 };
  44
  45 bool mipi_dsi_packet_format_is_short(u8 type);
  46 bool mipi_dsi_packet_format_is_long(u8 type);
  47
  48 /**
  49  * struct mipi_dsi_packet - represents a MIPI DSI packet in protocol format
  50  * @size: size (in bytes) of the packet
  51  * @header: the four bytes that make up the header (Data ID, Word Count or
  52  *     Packet Data, and ECC)
  53  * @payload_length: number of bytes in the payload
  54  * @payload: a pointer to a buffer containing the payload, if any
  55  */
  56 struct mipi_dsi_packet {
  57         size_t size;
  58         u8 header[4];
  59         size_t payload_length;
  60         const u8 *payload;
  61 };
  62
  63 int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
  64                            const struct mipi_dsi_msg *msg);
  65
  66 /**
  67  * struct mipi_dsi_host_ops - DSI bus operations
  68  * @attach: attach DSI device to DSI host
  69  * @detach: detach DSI device from DSI host
  70  * @transfer: transmit a DSI packet
  71  *
  72  * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
  73  * structures. This structure contains information about the type of packet
  74  * being transmitted as well as the transmit and receive buffers. When an
  75  * error is encountered during transmission, this function will return a
  76  * negative error code. On success it shall return the number of bytes
  77  * transmitted for write packets or the number of bytes received for read
  78  * packets.
  79  *
  80  * Note that typically DSI packet transmission is atomic, so the .transfer()
  81  * function will seldomly return anything other than the number of bytes
  82  * contained in the transmit buffer on success.
  83  */
  84 struct mipi_dsi_host_ops {
  85         int (*attach)(struct mipi_dsi_host *host,
  86                       struct mipi_dsi_device *dsi);
  87         int (*detach)(struct mipi_dsi_host *host,
  88                       struct mipi_dsi_device *dsi);
  89         ssize_t (*transfer)(struct mipi_dsi_host *host,
  90                             const struct mipi_dsi_msg *msg);
  91 };
  92
  93 /**
  94  * struct mipi_dsi_host - DSI host device
  95  * @dev: driver model device node for this DSI host
  96  * @ops: DSI host operations
  97  * @list: list management
  98  */
  99 struct mipi_dsi_host {
 100         struct device *dev;
 101         const struct mipi_dsi_host_ops *ops;
 102         struct list_head list;
 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 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
 108
 109 /* DSI mode flags */
 110
 111 /* video mode */
 112 #define MIPI_DSI_MODE_VIDEO             BIT(0)
 113 /* video burst mode */
 114 #define MIPI_DSI_MODE_VIDEO_BURST       BIT(1)
 115 /* video pulse mode */
 116 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE  BIT(2)
 117 /* enable auto vertical count mode */
 118 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT   BIT(3)
 119 /* enable hsync-end packets in vsync-pulse and v-porch area */
 120 #define MIPI_DSI_MODE_VIDEO_HSE         BIT(4)
 121 /* disable hfront-porch area */
 122 #define MIPI_DSI_MODE_VIDEO_HFP         BIT(5)
 123 /* disable hback-porch area */
 124 #define MIPI_DSI_MODE_VIDEO_HBP         BIT(6)
 125 /* disable hsync-active area */
 126 #define MIPI_DSI_MODE_VIDEO_HSA         BIT(7)
 127 /* flush display FIFO on vsync pulse */
 128 #define MIPI_DSI_MODE_VSYNC_FLUSH       BIT(8)
 129 /* disable EoT packets in HS mode */
 130 #define MIPI_DSI_MODE_EOT_PACKET        BIT(9)
 131 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */
 132 #define MIPI_DSI_CLOCK_NON_CONTINUOUS   BIT(10)
 133 /* transmit data in low power */
 134 #define MIPI_DSI_MODE_LPM               BIT(11)
 135
 136 enum mipi_dsi_pixel_format {
 137         MIPI_DSI_FMT_RGB888,
 138         MIPI_DSI_FMT_RGB666,
 139         MIPI_DSI_FMT_RGB666_PACKED,
 140         MIPI_DSI_FMT_RGB565,
 141 };
 142
 143 #define DSI_DEV_NAME_SIZE               20
 144
 145 /**
 146  * struct mipi_dsi_device_info - template for creating a mipi_dsi_device
 147  * @type: DSI peripheral chip type
 148  * @channel: DSI virtual channel assigned to peripheral
 149  * @node: pointer to OF device node or NULL
 150  *
 151  * This is populated and passed to mipi_dsi_device_new to create a new
 152  * DSI device
 153  */
 154 struct mipi_dsi_device_info {
 155         char type[DSI_DEV_NAME_SIZE];
 156         u32 channel;
 157         struct device_node *node;
 158 };
 159
 160 /**
 161  * struct mipi_dsi_device - DSI peripheral device
 162  * @host: DSI host for this peripheral
 163  * @dev: driver model device node for this peripheral
 164  * @name: DSI peripheral chip type
 165  * @channel: virtual channel assigned to the peripheral
 166  * @format: pixel format for video mode
 167  * @lanes: number of active data lanes
 168  * @mode_flags: DSI operation mode related flags
 169  * @hs_rate: maximum lane frequency for high speed mode in hertz, this should
 170  * be set to the real limits of the hardware, zero is only accepted for
 171  * legacy drivers
 172  * @lp_rate: maximum lane frequency for low power mode in hertz, this should
 173  * be set to the real limits of the hardware, zero is only accepted for
 174  * legacy drivers
 175  */
 176 struct mipi_dsi_device {
 177         struct mipi_dsi_host *host;
 178         struct device dev;
 179
 180         char name[DSI_DEV_NAME_SIZE];
 181         unsigned int channel;
 182         unsigned int lanes;
 183         enum mipi_dsi_pixel_format format;
 184         unsigned long mode_flags;
 185         unsigned long hs_rate;
 186         unsigned long lp_rate;
 187 };
 188
 189 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:"
 190
 191 static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
 192 {
 193         return container_of(dev, struct mipi_dsi_device, dev);
 194 }
 195
 196 /**
 197  * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any
 198  *                                given pixel format defined by the MIPI DSI
 199  *                                specification
 200  * @fmt: MIPI DSI pixel format
 201  *
 202  * Returns: The number of bits per pixel of the given pixel format.
 203  */
 204 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt)
 205 {
 206         switch (fmt) {
 207         case MIPI_DSI_FMT_RGB888:
 208         case MIPI_DSI_FMT_RGB666:
 209                 return 24;
 210
 211         case MIPI_DSI_FMT_RGB666_PACKED:
 212                 return 18;
 213
 214         case MIPI_DSI_FMT_RGB565:
 215                 return 16;
 216         }
 217
 218         return -EINVAL;
 219 }
 220
 221 struct mipi_dsi_device *
 222 mipi_dsi_device_register_full(struct mipi_dsi_host *host,
 223                               const struct mipi_dsi_device_info *info);
 224 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi);
 225 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
 226 int mipi_dsi_attach(struct mipi_dsi_device *dsi);
 227 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
 228 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi);
 229 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi);
 230 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 231                                             u16 value);
 232 ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable);
 233 ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi,
 234                                        const struct drm_dsc_picture_parameter_set *pps);
 235
 236 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
 237                                size_t size);
 238 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
 239                               size_t num_params, void *data, size_t size);
 240
 241 /**
 242  * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode
 243  * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking
 244  *    information only
 245  * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both
 246  *    V-Blanking and H-Blanking information
 247  */
 248 enum mipi_dsi_dcs_tear_mode {
 249         MIPI_DSI_DCS_TEAR_MODE_VBLANK,
 250         MIPI_DSI_DCS_TEAR_MODE_VHBLANK,
 251 };
 252
 253 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2)
 254 #define MIPI_DSI_DCS_POWER_MODE_NORMAL  (1 << 3)
 255 #define MIPI_DSI_DCS_POWER_MODE_SLEEP   (1 << 4)
 256 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5)
 257 #define MIPI_DSI_DCS_POWER_MODE_IDLE    (1 << 6)
 258
 259 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
 260                                   const void *data, size_t len);
 261 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,
 262                            const void *data, size_t len);
 263 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
 264                           size_t len);
 265 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi);
 266 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi);
 267 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode);
 268 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format);
 269 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi);
 270 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi);
 271 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi);
 272 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi);
 273 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start,
 274                                     u16 end);
 275 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start,
 276                                   u16 end);
 277 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi);
 278 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi,
 279                              enum mipi_dsi_dcs_tear_mode mode);
 280 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format);
 281 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline);
 282 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi,
 283                                         u16 brightness);
 284 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi,
 285                                         u16 *brightness);
 286
 287 /**
 288  * struct mipi_dsi_driver - DSI driver
 289  * @driver: device driver model driver
 290  * @probe: callback for device binding
 291  * @remove: callback for device unbinding
 292  * @shutdown: called at shutdown time to quiesce the device
 293  */
 294 struct mipi_dsi_driver {
 295         struct device_driver driver;
 296         int(*probe)(struct mipi_dsi_device *dsi);
 297         int(*remove)(struct mipi_dsi_device *dsi);
 298         void (*shutdown)(struct mipi_dsi_device *dsi);
 299 };
 300
 301 static inline struct mipi_dsi_driver *
 302 to_mipi_dsi_driver(struct device_driver *driver)
 303 {
 304         return container_of(driver, struct mipi_dsi_driver, driver);
 305 }
 306
 307 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi)
 308 {
 309         return dev_get_drvdata(&dsi->dev);
 310 }
 311
 312 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data)
 313 {
 314         dev_set_drvdata(&dsi->dev, data);
 315 }
 316
 317 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver,
 318                                   struct module *owner);
 319 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver);
 320
 321 #define mipi_dsi_driver_register(driver) \
 322         mipi_dsi_driver_register_full(driver, THIS_MODULE)
 323
 324 #define module_mipi_dsi_driver(__mipi_dsi_driver) \
 325         module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \
 326                         mipi_dsi_driver_unregister)
 327
 328 #endif /* __DRM_MIPI_DSI__ */