1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * MIPI Display Bus Interface (DBI) LCD controller support 4 * 5 * Copyright 2016 Noralf Trønnes 6 */ 7 8 #ifndef __LINUX_MIPI_DBI_H 9 #define __LINUX_MIPI_DBI_H 10 11 #include <linux/mutex.h> 12 #include <drm/drm_device.h> 13 #include <drm/drm_simple_kms_helper.h> 14 15 struct drm_format_conv_state; 16 struct drm_rect; 17 struct gpio_desc; 18 struct iosys_map; 19 struct regulator; 20 struct spi_device; 21 22 /** 23 * struct mipi_dbi - MIPI DBI interface 24 */ 25 struct mipi_dbi { 26 /** 27 * @cmdlock: Command lock 28 */ 29 struct mutex cmdlock; 30 31 /** 32 * @command: Bus specific callback executing commands. 33 */ 34 int (*command)(struct mipi_dbi *dbi, u8 *cmd, u8 *param, size_t num); 35 36 /** 37 * @read_commands: Array of read commands terminated by a zero entry. 38 * Reading is disabled if this is NULL. 39 */ 40 const u8 *read_commands; 41 42 /** 43 * @swap_bytes: Swap bytes in buffer before transfer 44 */ 45 bool swap_bytes; 46 47 /** 48 * @reset: Optional reset gpio 49 */ 50 struct gpio_desc *reset; 51 52 /* Type C specific */ 53 54 /** 55 * @spi: SPI device 56 */ 57 struct spi_device *spi; 58 59 /** 60 * @write_memory_bpw: Bits per word used on a MIPI_DCS_WRITE_MEMORY_START transfer 61 */ 62 unsigned int write_memory_bpw; 63 64 /** 65 * @dc: Optional D/C gpio. 66 */ 67 struct gpio_desc *dc; 68 69 /** 70 * @tx_buf9: Buffer used for Option 1 9-bit conversion 71 */ 72 void *tx_buf9; 73 74 /** 75 * @tx_buf9_len: Size of tx_buf9. 76 */ 77 size_t tx_buf9_len; 78 }; 79 80 /** 81 * struct mipi_dbi_dev - MIPI DBI device 82 */ 83 struct mipi_dbi_dev { 84 /** 85 * @drm: DRM device 86 */ 87 struct drm_device drm; 88 89 /** 90 * @pipe: Display pipe structure 91 */ 92 struct drm_simple_display_pipe pipe; 93 94 /** 95 * @connector: Connector 96 */ 97 struct drm_connector connector; 98 99 /** 100 * @mode: Fixed display mode 101 */ 102 struct drm_display_mode mode; 103 104 /** 105 * @pixel_format: Native pixel format (DRM_FORMAT\_\*) 106 */ 107 u32 pixel_format; 108 109 /** 110 * @tx_buf: Buffer used for transfer (copy clip rect area) 111 */ 112 u16 *tx_buf; 113 114 /** 115 * @rotation: initial rotation in degrees Counter Clock Wise 116 */ 117 unsigned int rotation; 118 119 /** 120 * @left_offset: Horizontal offset of the display relative to the 121 * controller's driver array 122 */ 123 unsigned int left_offset; 124 125 /** 126 * @top_offset: Vertical offset of the display relative to the 127 * controller's driver array 128 */ 129 unsigned int top_offset; 130 131 /** 132 * @backlight: backlight device (optional) 133 */ 134 struct backlight_device *backlight; 135 136 /** 137 * @regulator: power regulator (Vdd) (optional) 138 */ 139 struct regulator *regulator; 140 141 /** 142 * @io_regulator: I/O power regulator (Vddi) (optional) 143 */ 144 struct regulator *io_regulator; 145 146 /** 147 * @dbi: MIPI DBI interface 148 */ 149 struct mipi_dbi dbi; 150 151 /** 152 * @driver_private: Driver private data. 153 * Necessary for drivers with private data since devm_drm_dev_alloc() 154 * can't allocate structures that embed a structure which then again 155 * embeds drm_device. 156 */ 157 void *driver_private; 158 }; 159 160 static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm) 161 { 162 return container_of(drm, struct mipi_dbi_dev, drm); 163 } 164 165 int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi, 166 struct gpio_desc *dc); 167 int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev, 168 const struct drm_simple_display_pipe_funcs *funcs, 169 const uint32_t *formats, unsigned int format_count, 170 const struct drm_display_mode *mode, 171 unsigned int rotation, size_t tx_buf_size); 172 int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev, 173 const struct drm_simple_display_pipe_funcs *funcs, 174 const struct drm_display_mode *mode, unsigned int rotation); 175 enum drm_mode_status mipi_dbi_pipe_mode_valid(struct drm_simple_display_pipe *pipe, 176 const struct drm_display_mode *mode); 177 void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe, 178 struct drm_plane_state *old_state); 179 void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev, 180 struct drm_crtc_state *crtc_state, 181 struct drm_plane_state *plan_state); 182 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe); 183 int mipi_dbi_pipe_begin_fb_access(struct drm_simple_display_pipe *pipe, 184 struct drm_plane_state *plane_state); 185 void mipi_dbi_pipe_end_fb_access(struct drm_simple_display_pipe *pipe, 186 struct drm_plane_state *plane_state); 187 void mipi_dbi_pipe_reset_plane(struct drm_simple_display_pipe *pipe); 188 struct drm_plane_state *mipi_dbi_pipe_duplicate_plane_state(struct drm_simple_display_pipe *pipe); 189 void mipi_dbi_pipe_destroy_plane_state(struct drm_simple_display_pipe *pipe, 190 struct drm_plane_state *plane_state); 191 192 void mipi_dbi_hw_reset(struct mipi_dbi *dbi); 193 bool mipi_dbi_display_is_on(struct mipi_dbi *dbi); 194 int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev); 195 int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev); 196 197 u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len); 198 int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz, 199 u8 bpw, const void *buf, size_t len); 200 201 int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val); 202 int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len); 203 int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, const u8 *data, 204 size_t len); 205 int mipi_dbi_buf_copy(void *dst, struct iosys_map *src, struct drm_framebuffer *fb, 206 struct drm_rect *clip, bool swap, 207 struct drm_format_conv_state *fmtcnv_state); 208 209 /** 210 * mipi_dbi_command - MIPI DCS command with optional parameter(s) 211 * @dbi: MIPI DBI structure 212 * @cmd: Command 213 * @seq: Optional parameter(s) 214 * 215 * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for 216 * get/read. 217 * 218 * Returns: 219 * Zero on success, negative error code on failure. 220 */ 221 #define mipi_dbi_command(dbi, cmd, seq...) \ 222 ({ \ 223 const u8 d[] = { seq }; \ 224 struct device *dev = &(dbi)->spi->dev; \ 225 int ret; \ 226 ret = mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \ 227 if (ret) \ 228 dev_err_ratelimited(dev, "error %d when sending command %#02x\n", ret, cmd); \ 229 ret; \ 230 }) 231 232 #ifdef CONFIG_DEBUG_FS 233 void mipi_dbi_debugfs_init(struct drm_minor *minor); 234 #else 235 static inline void mipi_dbi_debugfs_init(struct drm_minor *minor) {} 236 #endif 237 238 /** 239 * DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS - Initializes struct drm_simple_display_pipe_funcs 240 * for MIPI-DBI devices 241 * @enable_: Enable-callback implementation 242 * 243 * This macro initializes struct drm_simple_display_pipe_funcs with default 244 * values for MIPI-DBI-based devices. The only callback that depends on the 245 * hardware is @enable, for which the driver has to provide an implementation. 246 * MIPI-based drivers are encouraged to use this macro for initialization. 247 */ 248 #define DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(enable_) \ 249 .mode_valid = mipi_dbi_pipe_mode_valid, \ 250 .enable = (enable_), \ 251 .disable = mipi_dbi_pipe_disable, \ 252 .update = mipi_dbi_pipe_update, \ 253 .begin_fb_access = mipi_dbi_pipe_begin_fb_access, \ 254 .end_fb_access = mipi_dbi_pipe_end_fb_access, \ 255 .reset_plane = mipi_dbi_pipe_reset_plane, \ 256 .duplicate_plane_state = mipi_dbi_pipe_duplicate_plane_state, \ 257 .destroy_plane_state = mipi_dbi_pipe_destroy_plane_state 258 259 #endif /* __LINUX_MIPI_DBI_H */ 260