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 * Also note that those callbacks can be called no matter the state the 85 * host is in. Drivers that need the underlying device to be powered to 86 * perform these operations will first need to make sure it's been 87 * properly enabled. 88 */ 89 struct mipi_dsi_host_ops { 90 int (*attach)(struct mipi_dsi_host *host, 91 struct mipi_dsi_device *dsi); 92 int (*detach)(struct mipi_dsi_host *host, 93 struct mipi_dsi_device *dsi); 94 ssize_t (*transfer)(struct mipi_dsi_host *host, 95 const struct mipi_dsi_msg *msg); 96 }; 97 98 /** 99 * struct mipi_dsi_host - DSI host device 100 * @dev: driver model device node for this DSI host 101 * @ops: DSI host operations 102 * @list: list management 103 */ 104 struct mipi_dsi_host { 105 struct device *dev; 106 const struct mipi_dsi_host_ops *ops; 107 struct list_head list; 108 }; 109 110 int mipi_dsi_host_register(struct mipi_dsi_host *host); 111 void mipi_dsi_host_unregister(struct mipi_dsi_host *host); 112 struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node); 113 114 /* DSI mode flags */ 115 116 /* video mode */ 117 #define MIPI_DSI_MODE_VIDEO BIT(0) 118 /* video burst mode */ 119 #define MIPI_DSI_MODE_VIDEO_BURST BIT(1) 120 /* video pulse mode */ 121 #define MIPI_DSI_MODE_VIDEO_SYNC_PULSE BIT(2) 122 /* enable auto vertical count mode */ 123 #define MIPI_DSI_MODE_VIDEO_AUTO_VERT BIT(3) 124 /* enable hsync-end packets in vsync-pulse and v-porch area */ 125 #define MIPI_DSI_MODE_VIDEO_HSE BIT(4) 126 /* disable hfront-porch area */ 127 #define MIPI_DSI_MODE_VIDEO_NO_HFP BIT(5) 128 /* disable hback-porch area */ 129 #define MIPI_DSI_MODE_VIDEO_NO_HBP BIT(6) 130 /* disable hsync-active area */ 131 #define MIPI_DSI_MODE_VIDEO_NO_HSA BIT(7) 132 /* flush display FIFO on vsync pulse */ 133 #define MIPI_DSI_MODE_VSYNC_FLUSH BIT(8) 134 /* disable EoT packets in HS mode */ 135 #define MIPI_DSI_MODE_NO_EOT_PACKET BIT(9) 136 /* device supports non-continuous clock behavior (DSI spec 5.6.1) */ 137 #define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10) 138 /* transmit data in low power */ 139 #define MIPI_DSI_MODE_LPM BIT(11) 140 /* transmit data ending at the same time for all lanes within one hsync */ 141 #define MIPI_DSI_HS_PKT_END_ALIGNED BIT(12) 142 143 enum mipi_dsi_pixel_format { 144 MIPI_DSI_FMT_RGB888, 145 MIPI_DSI_FMT_RGB666, 146 MIPI_DSI_FMT_RGB666_PACKED, 147 MIPI_DSI_FMT_RGB565, 148 }; 149 150 #define DSI_DEV_NAME_SIZE 20 151 152 /** 153 * struct mipi_dsi_device_info - template for creating a mipi_dsi_device 154 * @type: DSI peripheral chip type 155 * @channel: DSI virtual channel assigned to peripheral 156 * @node: pointer to OF device node or NULL 157 * 158 * This is populated and passed to mipi_dsi_device_new to create a new 159 * DSI device 160 */ 161 struct mipi_dsi_device_info { 162 char type[DSI_DEV_NAME_SIZE]; 163 u32 channel; 164 struct device_node *node; 165 }; 166 167 /** 168 * struct mipi_dsi_device - DSI peripheral device 169 * @host: DSI host for this peripheral 170 * @dev: driver model device node for this peripheral 171 * @name: DSI peripheral chip type 172 * @channel: virtual channel assigned to the peripheral 173 * @format: pixel format for video mode 174 * @lanes: number of active data lanes 175 * @mode_flags: DSI operation mode related flags 176 * @hs_rate: maximum lane frequency for high speed mode in hertz, this should 177 * be set to the real limits of the hardware, zero is only accepted for 178 * legacy drivers 179 * @lp_rate: maximum lane frequency for low power mode in hertz, this should 180 * be set to the real limits of the hardware, zero is only accepted for 181 * legacy drivers 182 * @dsc: panel/bridge DSC pps payload to be sent 183 */ 184 struct mipi_dsi_device { 185 struct mipi_dsi_host *host; 186 struct device dev; 187 188 char name[DSI_DEV_NAME_SIZE]; 189 unsigned int channel; 190 unsigned int lanes; 191 enum mipi_dsi_pixel_format format; 192 unsigned long mode_flags; 193 unsigned long hs_rate; 194 unsigned long lp_rate; 195 struct drm_dsc_config *dsc; 196 }; 197 198 #define MIPI_DSI_MODULE_PREFIX "mipi-dsi:" 199 200 static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev) 201 { 202 return container_of(dev, struct mipi_dsi_device, dev); 203 } 204 205 /** 206 * mipi_dsi_pixel_format_to_bpp - obtain the number of bits per pixel for any 207 * given pixel format defined by the MIPI DSI 208 * specification 209 * @fmt: MIPI DSI pixel format 210 * 211 * Returns: The number of bits per pixel of the given pixel format. 212 */ 213 static inline int mipi_dsi_pixel_format_to_bpp(enum mipi_dsi_pixel_format fmt) 214 { 215 switch (fmt) { 216 case MIPI_DSI_FMT_RGB888: 217 case MIPI_DSI_FMT_RGB666: 218 return 24; 219 220 case MIPI_DSI_FMT_RGB666_PACKED: 221 return 18; 222 223 case MIPI_DSI_FMT_RGB565: 224 return 16; 225 } 226 227 return -EINVAL; 228 } 229 230 struct mipi_dsi_device * 231 mipi_dsi_device_register_full(struct mipi_dsi_host *host, 232 const struct mipi_dsi_device_info *info); 233 void mipi_dsi_device_unregister(struct mipi_dsi_device *dsi); 234 struct mipi_dsi_device * 235 devm_mipi_dsi_device_register_full(struct device *dev, struct mipi_dsi_host *host, 236 const struct mipi_dsi_device_info *info); 237 struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np); 238 int mipi_dsi_attach(struct mipi_dsi_device *dsi); 239 int mipi_dsi_detach(struct mipi_dsi_device *dsi); 240 int devm_mipi_dsi_attach(struct device *dev, struct mipi_dsi_device *dsi); 241 int mipi_dsi_shutdown_peripheral(struct mipi_dsi_device *dsi); 242 int mipi_dsi_turn_on_peripheral(struct mipi_dsi_device *dsi); 243 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, 244 u16 value); 245 ssize_t mipi_dsi_compression_mode(struct mipi_dsi_device *dsi, bool enable); 246 ssize_t mipi_dsi_picture_parameter_set(struct mipi_dsi_device *dsi, 247 const struct drm_dsc_picture_parameter_set *pps); 248 249 ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload, 250 size_t size); 251 ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params, 252 size_t num_params, void *data, size_t size); 253 254 /** 255 * enum mipi_dsi_dcs_tear_mode - Tearing Effect Output Line mode 256 * @MIPI_DSI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking 257 * information only 258 * @MIPI_DSI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both 259 * V-Blanking and H-Blanking information 260 */ 261 enum mipi_dsi_dcs_tear_mode { 262 MIPI_DSI_DCS_TEAR_MODE_VBLANK, 263 MIPI_DSI_DCS_TEAR_MODE_VHBLANK, 264 }; 265 266 #define MIPI_DSI_DCS_POWER_MODE_DISPLAY (1 << 2) 267 #define MIPI_DSI_DCS_POWER_MODE_NORMAL (1 << 3) 268 #define MIPI_DSI_DCS_POWER_MODE_SLEEP (1 << 4) 269 #define MIPI_DSI_DCS_POWER_MODE_PARTIAL (1 << 5) 270 #define MIPI_DSI_DCS_POWER_MODE_IDLE (1 << 6) 271 272 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, 273 const void *data, size_t len); 274 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, 275 const void *data, size_t len); 276 ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, 277 size_t len); 278 int mipi_dsi_dcs_nop(struct mipi_dsi_device *dsi); 279 int mipi_dsi_dcs_soft_reset(struct mipi_dsi_device *dsi); 280 int mipi_dsi_dcs_get_power_mode(struct mipi_dsi_device *dsi, u8 *mode); 281 int mipi_dsi_dcs_get_pixel_format(struct mipi_dsi_device *dsi, u8 *format); 282 int mipi_dsi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi); 283 int mipi_dsi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi); 284 int mipi_dsi_dcs_set_display_off(struct mipi_dsi_device *dsi); 285 int mipi_dsi_dcs_set_display_on(struct mipi_dsi_device *dsi); 286 int mipi_dsi_dcs_set_column_address(struct mipi_dsi_device *dsi, u16 start, 287 u16 end); 288 int mipi_dsi_dcs_set_page_address(struct mipi_dsi_device *dsi, u16 start, 289 u16 end); 290 int mipi_dsi_dcs_set_tear_off(struct mipi_dsi_device *dsi); 291 int mipi_dsi_dcs_set_tear_on(struct mipi_dsi_device *dsi, 292 enum mipi_dsi_dcs_tear_mode mode); 293 int mipi_dsi_dcs_set_pixel_format(struct mipi_dsi_device *dsi, u8 format); 294 int mipi_dsi_dcs_set_tear_scanline(struct mipi_dsi_device *dsi, u16 scanline); 295 int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, 296 u16 brightness); 297 int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, 298 u16 *brightness); 299 300 /** 301 * mipi_dsi_dcs_write_seq - transmit a DCS command with payload 302 * @dsi: DSI peripheral device 303 * @cmd: Command 304 * @seq: buffer containing data to be transmitted 305 */ 306 #define mipi_dsi_dcs_write_seq(dsi, cmd, seq...) do { \ 307 static const u8 d[] = { cmd, seq }; \ 308 struct device *dev = &dsi->dev; \ 309 int ret; \ 310 ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d)); \ 311 if (ret < 0) { \ 312 dev_err_ratelimited(dev, "sending command %#02x failed: %d\n", cmd, ret); \ 313 return ret; \ 314 } \ 315 } while (0) 316 317 /** 318 * struct mipi_dsi_driver - DSI driver 319 * @driver: device driver model driver 320 * @probe: callback for device binding 321 * @remove: callback for device unbinding 322 * @shutdown: called at shutdown time to quiesce the device 323 */ 324 struct mipi_dsi_driver { 325 struct device_driver driver; 326 int(*probe)(struct mipi_dsi_device *dsi); 327 void (*remove)(struct mipi_dsi_device *dsi); 328 void (*shutdown)(struct mipi_dsi_device *dsi); 329 }; 330 331 static inline struct mipi_dsi_driver * 332 to_mipi_dsi_driver(struct device_driver *driver) 333 { 334 return container_of(driver, struct mipi_dsi_driver, driver); 335 } 336 337 static inline void *mipi_dsi_get_drvdata(const struct mipi_dsi_device *dsi) 338 { 339 return dev_get_drvdata(&dsi->dev); 340 } 341 342 static inline void mipi_dsi_set_drvdata(struct mipi_dsi_device *dsi, void *data) 343 { 344 dev_set_drvdata(&dsi->dev, data); 345 } 346 347 int mipi_dsi_driver_register_full(struct mipi_dsi_driver *driver, 348 struct module *owner); 349 void mipi_dsi_driver_unregister(struct mipi_dsi_driver *driver); 350 351 #define mipi_dsi_driver_register(driver) \ 352 mipi_dsi_driver_register_full(driver, THIS_MODULE) 353 354 #define module_mipi_dsi_driver(__mipi_dsi_driver) \ 355 module_driver(__mipi_dsi_driver, mipi_dsi_driver_register, \ 356 mipi_dsi_driver_unregister) 357 358 #endif /* __DRM_MIPI_DSI__ */ 359