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usr
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src
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linux-headers-6.8.0-83
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include
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drm
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drm_mipi_dbi.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * MIPI Display Bus Interface (DBI) LCD controller support * * Copyright 2016 Noralf Trønnes */ #ifndef __LINUX_MIPI_DBI_H #define __LINUX_MIPI_DBI_H #include <linux/mutex.h> #include <drm/drm_device.h> #include <drm/drm_simple_kms_helper.h> struct drm_format_conv_state; struct drm_rect; struct gpio_desc; struct iosys_map; struct regulator; struct spi_device; /** * struct mipi_dbi - MIPI DBI interface */ struct mipi_dbi { /** * @cmdlock: Command lock */ struct mutex cmdlock; /** * @command: Bus specific callback executing commands. */ int (*command)(struct mipi_dbi *dbi, u8 *cmd, u8 *param, size_t num); /** * @read_commands: Array of read commands terminated by a zero entry. * Reading is disabled if this is NULL. */ const u8 *read_commands; /** * @swap_bytes: Swap bytes in buffer before transfer */ bool swap_bytes; /** * @reset: Optional reset gpio */ struct gpio_desc *reset; /* Type C specific */ /** * @spi: SPI device */ struct spi_device *spi; /** * @dc: Optional D/C gpio. */ struct gpio_desc *dc; /** * @tx_buf9: Buffer used for Option 1 9-bit conversion */ void *tx_buf9; /** * @tx_buf9_len: Size of tx_buf9. */ size_t tx_buf9_len; }; /** * struct mipi_dbi_dev - MIPI DBI device */ struct mipi_dbi_dev { /** * @drm: DRM device */ struct drm_device drm; /** * @pipe: Display pipe structure */ struct drm_simple_display_pipe pipe; /** * @connector: Connector */ struct drm_connector connector; /** * @mode: Fixed display mode */ struct drm_display_mode mode; /** * @tx_buf: Buffer used for transfer (copy clip rect area) */ u16 *tx_buf; /** * @rotation: initial rotation in degrees Counter Clock Wise */ unsigned int rotation; /** * @left_offset: Horizontal offset of the display relative to the * controller's driver array */ unsigned int left_offset; /** * @top_offset: Vertical offset of the display relative to the * controller's driver array */ unsigned int top_offset; /** * @backlight: backlight device (optional) */ struct backlight_device *backlight; /** * @regulator: power regulator (Vdd) (optional) */ struct regulator *regulator; /** * @io_regulator: I/O power regulator (Vddi) (optional) */ struct regulator *io_regulator; /** * @dbi: MIPI DBI interface */ struct mipi_dbi dbi; /** * @driver_private: Driver private data. * Necessary for drivers with private data since devm_drm_dev_alloc() * can't allocate structures that embed a structure which then again * embeds drm_device. */ void *driver_private; }; static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm) { return container_of(drm, struct mipi_dbi_dev, drm); } int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi, struct gpio_desc *dc); int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev, const struct drm_simple_display_pipe_funcs *funcs, const uint32_t *formats, unsigned int format_count, const struct drm_display_mode *mode, unsigned int rotation, size_t tx_buf_size); int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev, const struct drm_simple_display_pipe_funcs *funcs, const struct drm_display_mode *mode, unsigned int rotation); enum drm_mode_status mipi_dbi_pipe_mode_valid(struct drm_simple_display_pipe *pipe, const struct drm_display_mode *mode); void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe, struct drm_plane_state *old_state); void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev, struct drm_crtc_state *crtc_state, struct drm_plane_state *plan_state); void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe); int mipi_dbi_pipe_begin_fb_access(struct drm_simple_display_pipe *pipe, struct drm_plane_state *plane_state); void mipi_dbi_pipe_end_fb_access(struct drm_simple_display_pipe *pipe, struct drm_plane_state *plane_state); void mipi_dbi_pipe_reset_plane(struct drm_simple_display_pipe *pipe); struct drm_plane_state *mipi_dbi_pipe_duplicate_plane_state(struct drm_simple_display_pipe *pipe); void mipi_dbi_pipe_destroy_plane_state(struct drm_simple_display_pipe *pipe, struct drm_plane_state *plane_state); void mipi_dbi_hw_reset(struct mipi_dbi *dbi); bool mipi_dbi_display_is_on(struct mipi_dbi *dbi); int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev); int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev); u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len); int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz, u8 bpw, const void *buf, size_t len); int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val); int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len); int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, const u8 *data, size_t len); int mipi_dbi_buf_copy(void *dst, struct iosys_map *src, struct drm_framebuffer *fb, struct drm_rect *clip, bool swap, struct drm_format_conv_state *fmtcnv_state); /** * mipi_dbi_command - MIPI DCS command with optional parameter(s) * @dbi: MIPI DBI structure * @cmd: Command * @seq: Optional parameter(s) * * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for * get/read. * * Returns: * Zero on success, negative error code on failure. */ #define mipi_dbi_command(dbi, cmd, seq...) \ ({ \ const u8 d[] = { seq }; \ struct device *dev = &(dbi)->spi->dev; \ int ret; \ ret = mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \ if (ret) \ dev_err_ratelimited(dev, "error %d when sending command %#02x\n", ret, cmd); \ ret; \ }) #ifdef CONFIG_DEBUG_FS void mipi_dbi_debugfs_init(struct drm_minor *minor); #else static inline void mipi_dbi_debugfs_init(struct drm_minor *minor) {} #endif /** * DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS - Initializes struct drm_simple_display_pipe_funcs * for MIPI-DBI devices * @enable_: Enable-callback implementation * * This macro initializes struct drm_simple_display_pipe_funcs with default * values for MIPI-DBI-based devices. The only callback that depends on the * hardware is @enable, for which the driver has to provide an implementation. * MIPI-based drivers are encouraged to use this macro for initialization. */ #define DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(enable_) \ .mode_valid = mipi_dbi_pipe_mode_valid, \ .enable = (enable_), \ .disable = mipi_dbi_pipe_disable, \ .update = mipi_dbi_pipe_update, \ .begin_fb_access = mipi_dbi_pipe_begin_fb_access, \ .end_fb_access = mipi_dbi_pipe_end_fb_access, \ .reset_plane = mipi_dbi_pipe_reset_plane, \ .duplicate_plane_state = mipi_dbi_pipe_duplicate_plane_state, \ .destroy_plane_state = mipi_dbi_pipe_destroy_plane_state #endif /* __LINUX_MIPI_DBI_H */
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