include/drm/tinydrm/mipi-dbi.h

   1 /*
   2  * MIPI Display Bus Interface (DBI) LCD controller support
   3  *
   4  * Copyright 2016 Noralf Trønnes
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #ifndef __LINUX_MIPI_DBI_H
  13 #define __LINUX_MIPI_DBI_H
  14
  15 #include <drm/tinydrm/tinydrm.h>
  16
  17 struct spi_device;
  18 struct gpio_desc;
  19 struct regulator;
  20
  21 /**
  22  * struct mipi_dbi - MIPI DBI controller
  23  * @tinydrm: tinydrm base
  24  * @spi: SPI device
  25  * @enabled: Pipeline is enabled
  26  * @cmdlock: Command lock
  27  * @command: Bus specific callback executing commands.
  28  * @read_commands: Array of read commands terminated by a zero entry.
  29  *                 Reading is disabled if this is NULL.
  30  * @dc: Optional D/C gpio.
  31  * @tx_buf: Buffer used for transfer (copy clip rect area)
  32  * @tx_buf9: Buffer used for Option 1 9-bit conversion
  33  * @tx_buf9_len: Size of tx_buf9.
  34  * @swap_bytes: Swap bytes in buffer before transfer
  35  * @reset: Optional reset gpio
  36  * @rotation: initial rotation in degrees Counter Clock Wise
  37  * @backlight: backlight device (optional)
  38  * @regulator: power regulator (optional)
  39  */
  40 struct mipi_dbi {
  41         struct tinydrm_device tinydrm;
  42         struct spi_device *spi;
  43         bool enabled;
  44         struct mutex cmdlock;
  45         int (*command)(struct mipi_dbi *mipi, u8 cmd, u8 *param, size_t num);
  46         const u8 *read_commands;
  47         struct gpio_desc *dc;
  48         u16 *tx_buf;
  49         void *tx_buf9;
  50         size_t tx_buf9_len;
  51         bool swap_bytes;
  52         struct gpio_desc *reset;
  53         unsigned int rotation;
  54         struct backlight_device *backlight;
  55         struct regulator *regulator;
  56 };
  57
  58 static inline struct mipi_dbi *
  59 mipi_dbi_from_tinydrm(struct tinydrm_device *tdev)
  60 {
  61         return container_of(tdev, struct mipi_dbi, tinydrm);
  62 }
  63
  64 int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *mipi,
  65                       struct gpio_desc *dc);
  66 int mipi_dbi_init(struct device *dev, struct mipi_dbi *mipi,
  67                   const struct drm_simple_display_pipe_funcs *pipe_funcs,
  68                   struct drm_driver *driver,
  69                   const struct drm_display_mode *mode, unsigned int rotation);
  70 void mipi_dbi_pipe_enable(struct drm_simple_display_pipe *pipe,
  71                           struct drm_crtc_state *crtc_state);
  72 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
  73 void mipi_dbi_hw_reset(struct mipi_dbi *mipi);
  74 bool mipi_dbi_display_is_on(struct mipi_dbi *mipi);
  75
  76 int mipi_dbi_command_read(struct mipi_dbi *mipi, u8 cmd, u8 *val);
  77 int mipi_dbi_command_buf(struct mipi_dbi *mipi, u8 cmd, u8 *data, size_t len);
  78
  79 /**
  80  * mipi_dbi_command - MIPI DCS command with optional parameter(s)
  81  * @mipi: MIPI structure
  82  * @cmd: Command
  83  * @seq...: Optional parameter(s)
  84  *
  85  * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
  86  * get/read.
  87  *
  88  * Returns:
  89  * Zero on success, negative error code on failure.
  90  */
  91 #define mipi_dbi_command(mipi, cmd, seq...) \
  92 ({ \
  93         u8 d[] = { seq }; \
  94         mipi_dbi_command_buf(mipi, cmd, d, ARRAY_SIZE(d)); \
  95 })
  96
  97 #ifdef CONFIG_DEBUG_FS
  98 int mipi_dbi_debugfs_init(struct drm_minor *minor);
  99 #else
 100 #define mipi_dbi_debugfs_init           NULL
 101 #endif
 102
 103 #endif /* __LINUX_MIPI_DBI_H */