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_format_conv_state;
16 struct drm_rect;
17 struct gpio_desc;
18 struct iosys_map;
19 struct regulator;
20 struct spi_device;
21
22 /**
23 * struct mipi_dbi - MIPI DBI interface
24 */
25 struct mipi_dbi {
26 /**
27 * @cmdlock: Command lock
28 */
29 struct mutex cmdlock;
30
31 /**
32 * @command: Bus specific callback executing commands.
33 */
34 int (*command)(struct mipi_dbi *dbi, u8 *cmd, u8 *param, size_t num);
35
36 /**
37 * @read_commands: Array of read commands terminated by a zero entry.
38 * Reading is disabled if this is NULL.
39 */
40 const u8 *read_commands;
41
42 /**
43 * @swap_bytes: Swap bytes in buffer before transfer
44 */
45 bool swap_bytes;
46
47 /**
48 * @reset: Optional reset gpio
49 */
50 struct gpio_desc *reset;
51
52 /* Type C specific */
53
54 /**
55 * @spi: SPI device
56 */
57 struct spi_device *spi;
58
59 /**
60 * @dc: Optional D/C gpio.
61 */
62 struct gpio_desc *dc;
63
64 /**
65 * @tx_buf9: Buffer used for Option 1 9-bit conversion
66 */
67 void *tx_buf9;
68
69 /**
70 * @tx_buf9_len: Size of tx_buf9.
71 */
72 size_t tx_buf9_len;
73 };
74
75 /**
76 * struct mipi_dbi_dev - MIPI DBI device
77 */
78 struct mipi_dbi_dev {
79 /**
80 * @drm: DRM device
81 */
82 struct drm_device drm;
83
84 /**
85 * @pipe: Display pipe structure
86 */
87 struct drm_simple_display_pipe pipe;
88
89 /**
90 * @connector: Connector
91 */
92 struct drm_connector connector;
93
94 /**
95 * @mode: Fixed display mode
96 */
97 struct drm_display_mode mode;
98
99 /**
100 * @tx_buf: Buffer used for transfer (copy clip rect area)
101 */
102 u16 *tx_buf;
103
104 /**
105 * @rotation: initial rotation in degrees Counter Clock Wise
106 */
107 unsigned int rotation;
108
109 /**
110 * @left_offset: Horizontal offset of the display relative to the
111 * controller's driver array
112 */
113 unsigned int left_offset;
114
115 /**
116 * @top_offset: Vertical offset of the display relative to the
117 * controller's driver array
118 */
119 unsigned int top_offset;
120
121 /**
122 * @backlight: backlight device (optional)
123 */
124 struct backlight_device *backlight;
125
126 /**
127 * @regulator: power regulator (Vdd) (optional)
128 */
129 struct regulator *regulator;
130
131 /**
132 * @io_regulator: I/O power regulator (Vddi) (optional)
133 */
134 struct regulator *io_regulator;
135
136 /**
137 * @dbi: MIPI DBI interface
138 */
139 struct mipi_dbi dbi;
140
141 /**
142 * @driver_private: Driver private data.
143 * Necessary for drivers with private data since devm_drm_dev_alloc()
144 * can't allocate structures that embed a structure which then again
145 * embeds drm_device.
146 */
147 void *driver_private;
148 };
149
drm_to_mipi_dbi_dev(struct drm_device * drm)150 static inline struct mipi_dbi_dev *drm_to_mipi_dbi_dev(struct drm_device *drm)
151 {
152 return container_of(drm, struct mipi_dbi_dev, drm);
153 }
154
155 int mipi_dbi_spi_init(struct spi_device *spi, struct mipi_dbi *dbi,
156 struct gpio_desc *dc);
157 int mipi_dbi_dev_init_with_formats(struct mipi_dbi_dev *dbidev,
158 const struct drm_simple_display_pipe_funcs *funcs,
159 const uint32_t *formats, unsigned int format_count,
160 const struct drm_display_mode *mode,
161 unsigned int rotation, size_t tx_buf_size);
162 int mipi_dbi_dev_init(struct mipi_dbi_dev *dbidev,
163 const struct drm_simple_display_pipe_funcs *funcs,
164 const struct drm_display_mode *mode, unsigned int rotation);
165 enum drm_mode_status mipi_dbi_pipe_mode_valid(struct drm_simple_display_pipe *pipe,
166 const struct drm_display_mode *mode);
167 void mipi_dbi_pipe_update(struct drm_simple_display_pipe *pipe,
168 struct drm_plane_state *old_state);
169 void mipi_dbi_enable_flush(struct mipi_dbi_dev *dbidev,
170 struct drm_crtc_state *crtc_state,
171 struct drm_plane_state *plan_state);
172 void mipi_dbi_pipe_disable(struct drm_simple_display_pipe *pipe);
173 int mipi_dbi_pipe_begin_fb_access(struct drm_simple_display_pipe *pipe,
174 struct drm_plane_state *plane_state);
175 void mipi_dbi_pipe_end_fb_access(struct drm_simple_display_pipe *pipe,
176 struct drm_plane_state *plane_state);
177 void mipi_dbi_pipe_reset_plane(struct drm_simple_display_pipe *pipe);
178 struct drm_plane_state *mipi_dbi_pipe_duplicate_plane_state(struct drm_simple_display_pipe *pipe);
179 void mipi_dbi_pipe_destroy_plane_state(struct drm_simple_display_pipe *pipe,
180 struct drm_plane_state *plane_state);
181
182 void mipi_dbi_hw_reset(struct mipi_dbi *dbi);
183 bool mipi_dbi_display_is_on(struct mipi_dbi *dbi);
184 int mipi_dbi_poweron_reset(struct mipi_dbi_dev *dbidev);
185 int mipi_dbi_poweron_conditional_reset(struct mipi_dbi_dev *dbidev);
186
187 u32 mipi_dbi_spi_cmd_max_speed(struct spi_device *spi, size_t len);
188 int mipi_dbi_spi_transfer(struct spi_device *spi, u32 speed_hz,
189 u8 bpw, const void *buf, size_t len);
190
191 int mipi_dbi_command_read(struct mipi_dbi *dbi, u8 cmd, u8 *val);
192 int mipi_dbi_command_buf(struct mipi_dbi *dbi, u8 cmd, u8 *data, size_t len);
193 int mipi_dbi_command_stackbuf(struct mipi_dbi *dbi, u8 cmd, const u8 *data,
194 size_t len);
195 int mipi_dbi_buf_copy(void *dst, struct iosys_map *src, struct drm_framebuffer *fb,
196 struct drm_rect *clip, bool swap,
197 struct drm_format_conv_state *fmtcnv_state);
198
199 /**
200 * mipi_dbi_command - MIPI DCS command with optional parameter(s)
201 * @dbi: MIPI DBI structure
202 * @cmd: Command
203 * @seq: Optional parameter(s)
204 *
205 * Send MIPI DCS command to the controller. Use mipi_dbi_command_read() for
206 * get/read.
207 *
208 * Returns:
209 * Zero on success, negative error code on failure.
210 */
211 #define mipi_dbi_command(dbi, cmd, seq...) \
212 ({ \
213 const u8 d[] = { seq }; \
214 struct device *dev = &(dbi)->spi->dev; \
215 int ret; \
216 ret = mipi_dbi_command_stackbuf(dbi, cmd, d, ARRAY_SIZE(d)); \
217 if (ret) \
218 dev_err_ratelimited(dev, "error %d when sending command %#02x\n", ret, cmd); \
219 ret; \
220 })
221
222 #ifdef CONFIG_DEBUG_FS
223 void mipi_dbi_debugfs_init(struct drm_minor *minor);
224 #else
mipi_dbi_debugfs_init(struct drm_minor * minor)225 static inline void mipi_dbi_debugfs_init(struct drm_minor *minor) {}
226 #endif
227
228 /**
229 * DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS - Initializes struct drm_simple_display_pipe_funcs
230 * for MIPI-DBI devices
231 * @enable_: Enable-callback implementation
232 *
233 * This macro initializes struct drm_simple_display_pipe_funcs with default
234 * values for MIPI-DBI-based devices. The only callback that depends on the
235 * hardware is @enable, for which the driver has to provide an implementation.
236 * MIPI-based drivers are encouraged to use this macro for initialization.
237 */
238 #define DRM_MIPI_DBI_SIMPLE_DISPLAY_PIPE_FUNCS(enable_) \
239 .mode_valid = mipi_dbi_pipe_mode_valid, \
240 .enable = (enable_), \
241 .disable = mipi_dbi_pipe_disable, \
242 .update = mipi_dbi_pipe_update, \
243 .begin_fb_access = mipi_dbi_pipe_begin_fb_access, \
244 .end_fb_access = mipi_dbi_pipe_end_fb_access, \
245 .reset_plane = mipi_dbi_pipe_reset_plane, \
246 .duplicate_plane_state = mipi_dbi_pipe_duplicate_plane_state, \
247 .destroy_plane_state = mipi_dbi_pipe_destroy_plane_state
248
249 #endif /* __LINUX_MIPI_DBI_H */
250