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58c467ec HS |
1 | /* |
2 | * Copyright (C) 2015 Heiko Schocher <hs@denx.de> | |
3 | * | |
4 | * from: | |
5 | * drivers/gpu/drm/panel/panel-ld9040.c | |
6 | * ld9040 AMOLED LCD drm_panel driver. | |
7 | * | |
8 | * Copyright (c) 2014 Samsung Electronics Co., Ltd | |
9 | * Derived from drivers/video/backlight/ld9040.c | |
10 | * | |
11 | * Andrzej Hajda <a.hajda@samsung.com> | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify | |
14 | * it under the terms of the GNU General Public License version 2 as | |
15 | * published by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include <drm/drmP.h> | |
19 | #include <drm/drm_panel.h> | |
20 | ||
21 | #include <linux/gpio/consumer.h> | |
22 | #include <linux/regulator/consumer.h> | |
23 | #include <linux/spi/spi.h> | |
24 | ||
25 | #include <video/mipi_display.h> | |
26 | #include <video/of_videomode.h> | |
27 | #include <video/videomode.h> | |
28 | ||
29 | struct lg4573 { | |
30 | struct drm_panel panel; | |
31 | struct spi_device *spi; | |
32 | struct videomode vm; | |
33 | }; | |
34 | ||
35 | static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel) | |
36 | { | |
37 | return container_of(panel, struct lg4573, panel); | |
38 | } | |
39 | ||
40 | static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data) | |
41 | { | |
42 | struct spi_transfer xfer = { | |
43 | .len = 2, | |
44 | }; | |
45 | u16 temp = cpu_to_be16(data); | |
46 | struct spi_message msg; | |
47 | ||
48 | dev_dbg(ctx->panel.dev, "writing data: %x\n", data); | |
49 | xfer.tx_buf = &temp; | |
50 | spi_message_init(&msg); | |
51 | spi_message_add_tail(&xfer, &msg); | |
52 | ||
53 | return spi_sync(ctx->spi, &msg); | |
54 | } | |
55 | ||
56 | static int lg4573_spi_write_u16_array(struct lg4573 *ctx, const u16 *buffer, | |
57 | unsigned int count) | |
58 | { | |
59 | unsigned int i; | |
60 | int ret; | |
61 | ||
62 | for (i = 0; i < count; i++) { | |
63 | ret = lg4573_spi_write_u16(ctx, buffer[i]); | |
64 | if (ret) | |
65 | return ret; | |
66 | } | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | static int lg4573_spi_write_dcs(struct lg4573 *ctx, u8 dcs) | |
72 | { | |
73 | return lg4573_spi_write_u16(ctx, (0x70 << 8 | dcs)); | |
74 | } | |
75 | ||
76 | static int lg4573_display_on(struct lg4573 *ctx) | |
77 | { | |
78 | int ret; | |
79 | ||
80 | ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_EXIT_SLEEP_MODE); | |
81 | if (ret) | |
82 | return ret; | |
83 | ||
84 | msleep(5); | |
85 | ||
86 | return lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_ON); | |
87 | } | |
88 | ||
89 | static int lg4573_display_off(struct lg4573 *ctx) | |
90 | { | |
91 | int ret; | |
92 | ||
93 | ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_OFF); | |
94 | if (ret) | |
95 | return ret; | |
96 | ||
97 | msleep(120); | |
98 | ||
99 | return lg4573_spi_write_dcs(ctx, MIPI_DCS_ENTER_SLEEP_MODE); | |
100 | } | |
101 | ||
102 | static int lg4573_display_mode_settings(struct lg4573 *ctx) | |
103 | { | |
104 | static const u16 display_mode_settings[] = { | |
105 | 0x703A, 0x7270, 0x70B1, 0x7208, | |
106 | 0x723B, 0x720F, 0x70B2, 0x7200, | |
107 | 0x72C8, 0x70B3, 0x7200, 0x70B4, | |
108 | 0x7200, 0x70B5, 0x7242, 0x7210, | |
109 | 0x7210, 0x7200, 0x7220, 0x70B6, | |
110 | 0x720B, 0x720F, 0x723C, 0x7213, | |
111 | 0x7213, 0x72E8, 0x70B7, 0x7246, | |
112 | 0x7206, 0x720C, 0x7200, 0x7200, | |
113 | }; | |
114 | ||
115 | dev_dbg(ctx->panel.dev, "transfer display mode settings\n"); | |
116 | return lg4573_spi_write_u16_array(ctx, display_mode_settings, | |
117 | ARRAY_SIZE(display_mode_settings)); | |
118 | } | |
119 | ||
120 | static int lg4573_power_settings(struct lg4573 *ctx) | |
121 | { | |
122 | static const u16 power_settings[] = { | |
123 | 0x70C0, 0x7201, 0x7211, 0x70C3, | |
124 | 0x7207, 0x7203, 0x7204, 0x7204, | |
125 | 0x7204, 0x70C4, 0x7212, 0x7224, | |
126 | 0x7218, 0x7218, 0x7202, 0x7249, | |
127 | 0x70C5, 0x726F, 0x70C6, 0x7241, | |
128 | 0x7263, | |
129 | }; | |
130 | ||
131 | dev_dbg(ctx->panel.dev, "transfer power settings\n"); | |
132 | return lg4573_spi_write_u16_array(ctx, power_settings, | |
133 | ARRAY_SIZE(power_settings)); | |
134 | } | |
135 | ||
136 | static int lg4573_gamma_settings(struct lg4573 *ctx) | |
137 | { | |
138 | static const u16 gamma_settings[] = { | |
139 | 0x70D0, 0x7203, 0x7207, 0x7273, | |
140 | 0x7235, 0x7200, 0x7201, 0x7220, | |
141 | 0x7200, 0x7203, 0x70D1, 0x7203, | |
142 | 0x7207, 0x7273, 0x7235, 0x7200, | |
143 | 0x7201, 0x7220, 0x7200, 0x7203, | |
144 | 0x70D2, 0x7203, 0x7207, 0x7273, | |
145 | 0x7235, 0x7200, 0x7201, 0x7220, | |
146 | 0x7200, 0x7203, 0x70D3, 0x7203, | |
147 | 0x7207, 0x7273, 0x7235, 0x7200, | |
148 | 0x7201, 0x7220, 0x7200, 0x7203, | |
149 | 0x70D4, 0x7203, 0x7207, 0x7273, | |
150 | 0x7235, 0x7200, 0x7201, 0x7220, | |
151 | 0x7200, 0x7203, 0x70D5, 0x7203, | |
152 | 0x7207, 0x7273, 0x7235, 0x7200, | |
153 | 0x7201, 0x7220, 0x7200, 0x7203, | |
154 | }; | |
155 | ||
156 | dev_dbg(ctx->panel.dev, "transfer gamma settings\n"); | |
157 | return lg4573_spi_write_u16_array(ctx, gamma_settings, | |
158 | ARRAY_SIZE(gamma_settings)); | |
159 | } | |
160 | ||
161 | static int lg4573_init(struct lg4573 *ctx) | |
162 | { | |
163 | int ret; | |
164 | ||
165 | dev_dbg(ctx->panel.dev, "initializing LCD\n"); | |
166 | ||
167 | ret = lg4573_display_mode_settings(ctx); | |
168 | if (ret) | |
169 | return ret; | |
170 | ||
171 | ret = lg4573_power_settings(ctx); | |
172 | if (ret) | |
173 | return ret; | |
174 | ||
175 | return lg4573_gamma_settings(ctx); | |
176 | } | |
177 | ||
178 | static int lg4573_power_on(struct lg4573 *ctx) | |
179 | { | |
180 | return lg4573_display_on(ctx); | |
181 | } | |
182 | ||
183 | static int lg4573_disable(struct drm_panel *panel) | |
184 | { | |
185 | struct lg4573 *ctx = panel_to_lg4573(panel); | |
186 | ||
187 | return lg4573_display_off(ctx); | |
188 | } | |
189 | ||
190 | static int lg4573_enable(struct drm_panel *panel) | |
191 | { | |
192 | struct lg4573 *ctx = panel_to_lg4573(panel); | |
193 | ||
194 | lg4573_init(ctx); | |
195 | ||
196 | return lg4573_power_on(ctx); | |
197 | } | |
198 | ||
199 | static const struct drm_display_mode default_mode = { | |
200 | .clock = 27000, | |
201 | .hdisplay = 480, | |
202 | .hsync_start = 480 + 10, | |
203 | .hsync_end = 480 + 10 + 59, | |
204 | .htotal = 480 + 10 + 59 + 10, | |
205 | .vdisplay = 800, | |
206 | .vsync_start = 800 + 15, | |
207 | .vsync_end = 800 + 15 + 15, | |
208 | .vtotal = 800 + 15 + 15 + 15, | |
209 | .vrefresh = 60, | |
210 | }; | |
211 | ||
212 | static int lg4573_get_modes(struct drm_panel *panel) | |
213 | { | |
214 | struct drm_connector *connector = panel->connector; | |
215 | struct drm_display_mode *mode; | |
216 | ||
217 | mode = drm_mode_duplicate(panel->drm, &default_mode); | |
218 | if (!mode) { | |
219 | dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n", | |
220 | default_mode.hdisplay, default_mode.vdisplay, | |
221 | default_mode.vrefresh); | |
222 | return -ENOMEM; | |
223 | } | |
224 | ||
225 | drm_mode_set_name(mode); | |
226 | ||
227 | mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; | |
228 | drm_mode_probed_add(connector, mode); | |
229 | ||
230 | panel->connector->display_info.width_mm = 61; | |
231 | panel->connector->display_info.height_mm = 103; | |
232 | ||
233 | return 1; | |
234 | } | |
235 | ||
236 | static const struct drm_panel_funcs lg4573_drm_funcs = { | |
237 | .disable = lg4573_disable, | |
238 | .enable = lg4573_enable, | |
239 | .get_modes = lg4573_get_modes, | |
240 | }; | |
241 | ||
242 | static int lg4573_probe(struct spi_device *spi) | |
243 | { | |
244 | struct lg4573 *ctx; | |
245 | int ret; | |
246 | ||
247 | ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL); | |
248 | if (!ctx) | |
249 | return -ENOMEM; | |
250 | ||
251 | ctx->spi = spi; | |
252 | ||
253 | spi_set_drvdata(spi, ctx); | |
254 | spi->bits_per_word = 8; | |
255 | ||
256 | ret = spi_setup(spi); | |
257 | if (ret < 0) { | |
258 | dev_err(&spi->dev, "SPI setup failed: %d\n", ret); | |
259 | return ret; | |
260 | } | |
261 | ||
262 | drm_panel_init(&ctx->panel); | |
263 | ctx->panel.dev = &spi->dev; | |
264 | ctx->panel.funcs = &lg4573_drm_funcs; | |
265 | ||
266 | return drm_panel_add(&ctx->panel); | |
267 | } | |
268 | ||
269 | static int lg4573_remove(struct spi_device *spi) | |
270 | { | |
271 | struct lg4573 *ctx = spi_get_drvdata(spi); | |
272 | ||
273 | lg4573_display_off(ctx); | |
274 | drm_panel_remove(&ctx->panel); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | static const struct of_device_id lg4573_of_match[] = { | |
280 | { .compatible = "lg,lg4573" }, | |
281 | { } | |
282 | }; | |
283 | MODULE_DEVICE_TABLE(of, lg4573_of_match); | |
284 | ||
285 | static struct spi_driver lg4573_driver = { | |
286 | .probe = lg4573_probe, | |
287 | .remove = lg4573_remove, | |
288 | .driver = { | |
289 | .name = "lg4573", | |
58c467ec HS |
290 | .of_match_table = lg4573_of_match, |
291 | }, | |
292 | }; | |
293 | module_spi_driver(lg4573_driver); | |
294 | ||
295 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); | |
296 | MODULE_DESCRIPTION("lg4573 LCD Driver"); | |
297 | MODULE_LICENSE("GPL v2"); |