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Diffstat (limited to 'include/video/mipi_dbi.h')
| -rw-r--r-- | include/video/mipi_dbi.h | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/include/video/mipi_dbi.h b/include/video/mipi_dbi.h new file mode 100644 index 0000000000..c1c2a620ed --- /dev/null +++ b/include/video/mipi_dbi.h @@ -0,0 +1,175 @@ +/* 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/types.h> +#include <spi/spi.h> +#include <driver.h> +#include <fb.h> + +struct regulator; +struct fb_videomode; +struct gpio_desc; + +/** + * struct mipi_dbi - MIPI DBI interface + */ +struct mipi_dbi { + /** + * @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; + + struct list_head list; +}; + +/** + * struct mipi_dbi_dev - MIPI DBI device + */ +struct mipi_dbi_dev { + /** + * @dev: Device + */ + struct device *dev; + + /** + * @info: Framebuffer info + */ + struct fb_info info; + + /** + * @mode: Fixed display mode + */ + struct fb_videomode mode; + + /** + * @tx_buf: Buffer used for transfer (copy clip rect area) + */ + u8 *tx_buf; + + /** + * @backlight_node: backlight device node (optional) + */ + struct device_node *backlight_node; + + /** + * @backlight: backlight device (optional) + */ + struct backlight_device *backlight; + + /** + * @regulator: power regulator (Vdd) (optional) + */ + struct regulator *regulator; + + /** + * @io_regulator: I/O power regulator (Vddi) (optional) + */ + struct regulator *io_regulator; + + /** + * @dbi: MIPI DBI interface + */ + struct mipi_dbi dbi; + + /** + * @driver_private: Driver private data. + */ + void *driver_private; + + /** + * @damage: Damage rectangle. + */ + struct fb_rect damage; +}; + +static inline const char *mipi_dbi_name(struct mipi_dbi *dbi) +{ + return dev_name(&dbi->spi->dev); +} + +int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi, + struct gpio_desc *dc); +int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev, + struct fb_ops *ops, struct fb_videomode *mode); +void mipi_dbi_fb_damage(struct fb_info *info, const struct fb_rect *rect); +void mipi_dbi_fb_flush(struct fb_info *info); +void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev, + struct fb_info *info); +void mipi_dbi_fb_disable(struct fb_info *info); +void mipi_dbi_hw_reset(struct mipi_dbi *dbi); +bool mipi_dbi_display_is_on(struct mipi_dbi *dbi); +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); + +/** + * 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 }; \ + struct device *dev = &(dbi)->spi->dev; \ + int ret; \ + ret = mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \ + if (ret) \ + dev_err(dev, "error %pe when sending command %#02x\n", ERR_PTR(ret), cmd); \ + ret; \ +}) + +bool mipi_dbi_command_is_read(struct mipi_dbi *dbi, u8 cmd); +int mipi_dbi_command_read_len(int cmd); + +extern struct list_head mipi_dbi_list; + +#endif /* __LINUX_MIPI_DBI_H */ |