include/drm/drm_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 interface
  22  */
  23 struct 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  */
  76 struct 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          * @tx_buf: Buffer used for transfer (copy clip rect area)
  99          */
 100         u16 *tx_buf;
 101
 102         /**
 103          * @rotation: initial rotation in degrees Counter Clock Wise
 104          */
 105         unsigned int rotation;
 106
 107         /**
 108          * @left_offset: Horizontal offset of the display relative to the
 109          *               controller's driver array
 110          */
 111         unsigned int left_offset;
 112
 113         /**
 114          * @top_offset: Vertical offset of the display relative to the
 115          *              controller's driver array
 116          */
 117         unsigned int top_offset;
 118
 119         /**
 120          * @backlight: backlight device (optional)
 121          */
 122         struct backlight_device *backlight;
 123
 124         /**
 125          * @regulator: power regulator (optional)
 126          */
 127         struct regulator *regulator;
 128
 129         /**
 130          * @dbi: MIPI DBI interface
 131          */
 132         struct mipi_dbi dbi;
 133 };
 134
 135 static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)
 136 {
 137         return container_of(drm, struct mipi_dbi_dev, drm);
 138 }
 139
 140 int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
 141                       struct gpio_desc *dc);
 142 int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev,
 143                                    const struct drm_simple_display_pipe_funcs *funcs,
 144                                    const uint32_t *formats, unsigned int format_count,
 145                                    const struct drm_display_mode *mode,
 146                                    unsigned int rotation, size_t tx_buf_size);
 147 int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev,
 148                       const struct drm_simple_display_pipe_funcs *funcs,
 149                       const struct drm_display_mode *mode, unsigned int rotation);
 150 void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
 151                           struct drm_plane_state *old_state);
 152 void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev,
 153                            struct drm_crtc_state *crtc_state,
 154                            struct drm_plane_state *plan_state);
 155 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
 156 void mipi_dbi_hw_reset(struct mipi_dbi *dbi);
 157 bool mipi_dbi_display_is_on(struct mipi_dbi *dbi);
 158 int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev);
 159 int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev);
 160
 161 u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
 162 int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz,
 163                           u8 bpw, const void *buf, size_t len);
 164
 165 int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val);
 166 int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
 167 int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, const u8 *data,
 168                               size_t len);
 169 int mipi_dbi_buf_copy(void *dst, struct drm_framebuffer *fb,
 170                       struct drm_rect *clip, bool swap);
 171 /**
 172  * mipi_dbi_command - MIPI DCS command with optional parameter(s)
 173  * @dbi: MIPI DBI structure
 174  * @cmd: Command
 175  * @seq...: Optional parameter(s)
 176  *
 177  * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
 178  * get/read.
 179  *
 180  * Returns:
 181  * Zero on success, negative error code on failure.
 182  */
 183 #define mipi_dbi_command(dbi, cmd, seq...) \
 184 ({ \
 185         const u8 d[] = { seq }; \
 186         mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \
 187 })
 188
 189 #ifdef CONFIG_DEBUG_FS
 190 void mipi_dbi_debugfs_init(struct drm_minor *minor);
 191 #else
 192 #define mipi_dbi_debugfs_init           NULL
 193 #endif
 194
 195 #endif /* __LINUX_MIPI_DBI_H */