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