include/drm/tinydrm/mipi-dbi.h

   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 spi_device;
  17 struct gpio_desc;
  18 struct regulator;
  19
  20 /**
  21  * struct mipi_dbi - MIPI DBI controller
  22  * @spi: SPI device
  23  * @enabled: Pipeline is enabled
  24  * @cmdlock: Command lock
  25  * @command: Bus specific callback executing commands.
  26  * @read_commands: Array of read commands terminated by a zero entry.
  27  *                 Reading is disabled if this is NULL.
  28  * @dc: Optional D/C gpio.
  29  * @tx_buf: Buffer used for transfer (copy clip rect area)
  30  * @tx_buf9: Buffer used for Option 1 9-bit conversion
  31  * @tx_buf9_len: Size of tx_buf9.
  32  * @swap_bytes: Swap bytes in buffer before transfer
  33  * @reset: Optional reset gpio
  34  * @rotation: initial rotation in degrees Counter Clock Wise
  35  * @backlight: backlight device (optional)
  36  * @regulator: power regulator (optional)
  37  */
  38 struct mipi_dbi {
  39         /**
  40          * @drm: DRM device
  41          */
  42         struct drm_device drm;
  43
  44         /**
  45          * @pipe: Display pipe structure
  46          */
  47         struct drm_simple_display_pipe pipe;
  48
  49         struct spi_device *spi;
  50         bool enabled;
  51         struct mutex cmdlock;
  52         int (*command)(struct mipi_dbi *mipi, u8 *cmd, u8 *param, size_t num);
  53         const u8 *read_commands;
  54         struct gpio_desc *dc;
  55         u16 *tx_buf;
  56         void *tx_buf9;
  57         size_t tx_buf9_len;
  58         bool swap_bytes;
  59         struct gpio_desc *reset;
  60         unsigned int rotation;
  61         struct backlight_device *backlight;
  62         struct regulator *regulator;
  63 };
  64
  65 static inline struct mipi_dbi *drm_to_mipi_dbi(struct drm_device *drm)
  66 {
  67         return container_of(drm, struct mipi_dbi, drm);
  68 }
  69
  70 int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
  71                       struct gpio_desc *dc);
  72 int mipi_dbi_init(struct mipi_dbi *mipi,
  73                   const struct drm_simple_display_pipe_funcs *funcs,
  74                   const struct drm_display_mode *mode, unsigned int rotation);
  75 void mipi_dbi_release(struct drm_device *drm);
  76 void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
  77                           struct drm_plane_state *old_state);
  78 void mipi_dbi_enable_flush(struct mipi_dbi *mipi,
  79                            struct drm_crtc_state *crtc_state,
  80                            struct drm_plane_state *plan_state);
  81 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
  82 void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
  83 bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);
  84 int mipi_dbi_poweron_reset(struct mipi_dbi *mipi);
  85 int mipi_dbi_poweron_conditional_reset(struct mipi_dbi *mipi);
  86 u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
  87
  88 int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);
  89 int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);
  90 int mipi_dbi_command_stackbuf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);
  91 int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
  92                       struct drm_rect *clip, bool swap);
  93 /**
  94  * mipi_dbi_command - MIPI DCS command with optional parameter(s)
  95  * @mipi: MIPI structure
  96  * @cmd: Command
  97  * @seq...: Optional parameter(s)
  98  *
  99  * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
 100  * get/read.
 101  *
 102  * Returns:
 103  * Zero on success, negative error code on failure.
 104  */
 105 #define mipi_dbi_command(mipi, cmd, seq...) \
 106 ({ \
 107         u8 d[] = { seq }; \
 108         mipi_dbi_command_stackbuf(mipi, cmd, d, ARRAY_SIZE(d)); \
 109 })
 110
 111 #ifdef CONFIG_DEBUG_FS
 112 int mipi_dbi_debugfs_init(struct drm_minor *minor);
 113 #else
 114 #define mipi_dbi_debugfs_init           NULL
 115 #endif
 116
 117 #endif /* __LINUX_MIPI_DBI_H */