linux/include/drm/drm_mipi_dbi.h
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   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
  15struct drm_rect;
  16struct spi_device;
  17struct gpio_desc;
  18struct regulator;
  19
  20/**
  21 * struct mipi_dbi - MIPI DBI interface
  22 */
  23struct mipi_dbi {
  24        /**
  25         * @cmdlock: Command lock
  26         */
  27        struct mutex cmdlock;
  28
  29        /**
  30         * @command: Bus specific callback executing commands.
  31         */
  32        int (*command)(struct mipi_dbi *dbi, u8 *cmd, u8 *param, size_t num);
  33
  34        /**
  35         * @read_commands: Array of read commands terminated by a zero entry.
  36         *                 Reading is disabled if this is NULL.
  37         */
  38        const u8 *read_commands;
  39
  40        /**
  41         * @swap_bytes: Swap bytes in buffer before transfer
  42         */
  43        bool swap_bytes;
  44
  45        /**
  46         * @reset: Optional reset gpio
  47         */
  48        struct gpio_desc *reset;
  49
  50        /* Type C specific */
  51
  52        /**
  53         * @spi: SPI device
  54         */
  55        struct spi_device *spi;
  56
  57        /**
  58         * @dc: Optional D/C gpio.
  59         */
  60        struct gpio_desc *dc;
  61
  62        /**
  63         * @tx_buf9: Buffer used for Option 1 9-bit conversion
  64         */
  65        void *tx_buf9;
  66
  67        /**
  68         * @tx_buf9_len: Size of tx_buf9.
  69         */
  70        size_t tx_buf9_len;
  71};
  72
  73/**
  74 * struct mipi_dbi_dev - MIPI DBI device
  75 */
  76struct mipi_dbi_dev {
  77        /**
  78         * @drm: DRM device
  79         */
  80        struct drm_device drm;
  81
  82        /**
  83         * @pipe: Display pipe structure
  84         */
  85        struct drm_simple_display_pipe pipe;
  86
  87        /**
  88         * @connector: Connector
  89         */
  90        struct drm_connector connector;
  91
  92        /**
  93         * @mode: Fixed display mode
  94         */
  95        struct drm_display_mode mode;
  96
  97        /**
  98         * @enabled: Pipeline is enabled
  99         */
 100        bool enabled;
 101
 102        /**
 103         * @tx_buf: Buffer used for transfer (copy clip rect area)
 104         */
 105        u16 *tx_buf;
 106
 107        /**
 108         * @rotation: initial rotation in degrees Counter Clock Wise
 109         */
 110        unsigned int rotation;
 111
 112        /**
 113         * @backlight: backlight device (optional)
 114         */
 115        struct backlight_device *backlight;
 116
 117        /**
 118         * @regulator: power regulator (optional)
 119         */
 120        struct regulator *regulator;
 121
 122        /**
 123         * @dbi: MIPI DBI interface
 124         */
 125        struct mipi_dbi dbi;
 126};
 127
 128static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)
 129{
 130        return container_of(drm, struct mipi_dbi_dev, drm);
 131}
 132
 133int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
 134                      struct gpio_desc *dc);
 135int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev,
 136                                   const struct drm_simple_display_pipe_funcs *funcs,
 137                                   const uint32_t *formats, unsigned int format_count,
 138                                   const struct drm_display_mode *mode,
 139                                   unsigned int rotation, size_t tx_buf_size);
 140int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev,
 141                      const struct drm_simple_display_pipe_funcs *funcs,
 142                      const struct drm_display_mode *mode, unsigned int rotation);
 143void mipi_dbi_release(struct drm_device *drm);
 144void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
 145                          struct drm_plane_state *old_state);
 146void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev,
 147                           struct drm_crtc_state *crtc_state,
 148                           struct drm_plane_state *plan_state);
 149void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
 150void mipi_dbi_hw_reset(struct mipi_dbi *dbi);
 151bool mipi_dbi_display_is_on(struct mipi_dbi *dbi);
 152int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev);
 153int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev);
 154
 155u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
 156int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz,
 157                          u8 bpw, const void *buf, size_t len);
 158
 159int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val);
 160int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
 161int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
 162int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 163                      struct drm_rect *clip, bool swap);
 164/**
 165 * mipi_dbi_command - MIPI DCS command with optional parameter(s)
 166 * @dbi: MIPI DBI structure
 167 * @cmd: Command
 168 * @seq...: Optional parameter(s)
 169 *
 170 * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
 171 * get/read.
 172 *
 173 * Returns:
 174 * Zero on success, negative error code on failure.
 175 */
 176#define mipi_dbi_command(dbi, cmd, seq...) \
 177({ \
 178        u8 d[] = { seq }; \
 179        mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \
 180})
 181
 182#ifdef CONFIG_DEBUG_FS
 183int mipi_dbi_debugfs_init(struct drm_minor *minor);
 184#else
 185#define mipi_dbi_debugfs_init           NULL
 186#endif
 187
 188#endif /* __LINUX_MIPI_DBI_H */
 189