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02dd95fe NT |
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, | |
ace98812 | 65 | struct gpio_desc *dc); |
02dd95fe NT |
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 */ |