diff options
Diffstat (limited to 'include/drm/drm_mipi_dbi.h')
| -rw-r--r-- | include/drm/drm_mipi_dbi.h | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/include/drm/drm_mipi_dbi.h b/include/drm/drm_mipi_dbi.h new file mode 100644 index 000000000..c2827ceab --- /dev/null +++ b/include/drm/drm_mipi_dbi.h @@ -0,0 +1,195 @@ +/* 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_rect; +struct spi_device; +struct gpio_desc; +struct regulator; + +/** + * 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 (optional) + */ + struct regulator *regulator; + + /** + * @dbi: MIPI DBI interface + */ + struct mipi_dbi dbi; +}; + +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); +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); +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 drm_framebuffer *fb, + struct drm_rect *clip, bool swap); +/** + * 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 }; \ + mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \ +}) + +#ifdef CONFIG_DEBUG_FS +void mipi_dbi_debugfs_init(struct drm_minor *minor); +#else +#define mipi_dbi_debugfs_init NULL +#endif + +#endif /* __LINUX_MIPI_DBI_H */ |