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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
58c467ec HS |
2 | /* |
3 | * Copyright (C) 2015 Heiko Schocher <hs@denx.de> | |
4 | * | |
5 | * from: | |
6 | * drivers/gpu/drm/panel/panel-ld9040.c | |
7 | * ld9040 AMOLED LCD drm_panel driver. | |
8 | * | |
9 | * Copyright (c) 2014 Samsung Electronics Co., Ltd | |
10 | * Derived from drivers/video/backlight/ld9040.c | |
11 | * | |
12 | * Andrzej Hajda <a.hajda@samsung.com> | |
58c467ec HS |
13 | */ |
14 | ||
15 | #include <drm/drmP.h> | |
16 | #include <drm/drm_panel.h> | |
17 | ||
18 | #include <linux/gpio/consumer.h> | |
19 | #include <linux/regulator/consumer.h> | |
20 | #include <linux/spi/spi.h> | |
21 | ||
22 | #include <video/mipi_display.h> | |
23 | #include <video/of_videomode.h> | |
24 | #include <video/videomode.h> | |
25 | ||
26 | struct lg4573 { | |
27 | struct drm_panel panel; | |
28 | struct spi_device *spi; | |
29 | struct videomode vm; | |
30 | }; | |
31 | ||
32 | static inline struct lg4573 *panel_to_lg4573(struct drm_panel *panel) | |
33 | { | |
34 | return container_of(panel, struct lg4573, panel); | |
35 | } | |
36 | ||
37 | static int lg4573_spi_write_u16(struct lg4573 *ctx, u16 data) | |
38 | { | |
39 | struct spi_transfer xfer = { | |
40 | .len = 2, | |
41 | }; | |
42 | u16 temp = cpu_to_be16(data); | |
43 | struct spi_message msg; | |
44 | ||
45 | dev_dbg(ctx->panel.dev, "writing data: %x\n", data); | |
46 | xfer.tx_buf = &temp; | |
47 | spi_message_init(&msg); | |
48 | spi_message_add_tail(&xfer, &msg); | |
49 | ||
50 | return spi_sync(ctx->spi, &msg); | |
51 | } | |
52 | ||
53 | static int lg4573_spi_write_u16_array(struct lg4573 *ctx, const u16 *buffer, | |
54 | unsigned int count) | |
55 | { | |
56 | unsigned int i; | |
57 | int ret; | |
58 | ||
59 | for (i = 0; i < count; i++) { | |
60 | ret = lg4573_spi_write_u16(ctx, buffer[i]); | |
61 | if (ret) | |
62 | return ret; | |
63 | } | |
64 | ||
65 | return 0; | |
66 | } | |
67 | ||
68 | static int lg4573_spi_write_dcs(struct lg4573 *ctx, u8 dcs) | |
69 | { | |
70 | return lg4573_spi_write_u16(ctx, (0x70 << 8 | dcs)); | |
71 | } | |
72 | ||
73 | static int lg4573_display_on(struct lg4573 *ctx) | |
74 | { | |
75 | int ret; | |
76 | ||
77 | ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_EXIT_SLEEP_MODE); | |
78 | if (ret) | |
79 | return ret; | |
80 | ||
81 | msleep(5); | |
82 | ||
83 | return lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_ON); | |
84 | } | |
85 | ||
86 | static int lg4573_display_off(struct lg4573 *ctx) | |
87 | { | |
88 | int ret; | |
89 | ||
90 | ret = lg4573_spi_write_dcs(ctx, MIPI_DCS_SET_DISPLAY_OFF); | |
91 | if (ret) | |
92 | return ret; | |
93 | ||
94 | msleep(120); | |
95 | ||
96 | return lg4573_spi_write_dcs(ctx, MIPI_DCS_ENTER_SLEEP_MODE); | |
97 | } | |
98 | ||
99 | static int lg4573_display_mode_settings(struct lg4573 *ctx) | |
100 | { | |
101 | static const u16 display_mode_settings[] = { | |
102 | 0x703A, 0x7270, 0x70B1, 0x7208, | |
103 | 0x723B, 0x720F, 0x70B2, 0x7200, | |
104 | 0x72C8, 0x70B3, 0x7200, 0x70B4, | |
105 | 0x7200, 0x70B5, 0x7242, 0x7210, | |
106 | 0x7210, 0x7200, 0x7220, 0x70B6, | |
107 | 0x720B, 0x720F, 0x723C, 0x7213, | |
108 | 0x7213, 0x72E8, 0x70B7, 0x7246, | |
109 | 0x7206, 0x720C, 0x7200, 0x7200, | |
110 | }; | |
111 | ||
112 | dev_dbg(ctx->panel.dev, "transfer display mode settings\n"); | |
113 | return lg4573_spi_write_u16_array(ctx, display_mode_settings, | |
114 | ARRAY_SIZE(display_mode_settings)); | |
115 | } | |
116 | ||
117 | static int lg4573_power_settings(struct lg4573 *ctx) | |
118 | { | |
119 | static const u16 power_settings[] = { | |
120 | 0x70C0, 0x7201, 0x7211, 0x70C3, | |
121 | 0x7207, 0x7203, 0x7204, 0x7204, | |
122 | 0x7204, 0x70C4, 0x7212, 0x7224, | |
123 | 0x7218, 0x7218, 0x7202, 0x7249, | |
124 | 0x70C5, 0x726F, 0x70C6, 0x7241, | |
125 | 0x7263, | |
126 | }; | |
127 | ||
128 | dev_dbg(ctx->panel.dev, "transfer power settings\n"); | |
129 | return lg4573_spi_write_u16_array(ctx, power_settings, | |
130 | ARRAY_SIZE(power_settings)); | |
131 | } | |
132 | ||
133 | static int lg4573_gamma_settings(struct lg4573 *ctx) | |
134 | { | |
135 | static const u16 gamma_settings[] = { | |
136 | 0x70D0, 0x7203, 0x7207, 0x7273, | |
137 | 0x7235, 0x7200, 0x7201, 0x7220, | |
138 | 0x7200, 0x7203, 0x70D1, 0x7203, | |
139 | 0x7207, 0x7273, 0x7235, 0x7200, | |
140 | 0x7201, 0x7220, 0x7200, 0x7203, | |
141 | 0x70D2, 0x7203, 0x7207, 0x7273, | |
142 | 0x7235, 0x7200, 0x7201, 0x7220, | |
143 | 0x7200, 0x7203, 0x70D3, 0x7203, | |
144 | 0x7207, 0x7273, 0x7235, 0x7200, | |
145 | 0x7201, 0x7220, 0x7200, 0x7203, | |
146 | 0x70D4, 0x7203, 0x7207, 0x7273, | |
147 | 0x7235, 0x7200, 0x7201, 0x7220, | |
148 | 0x7200, 0x7203, 0x70D5, 0x7203, | |
149 | 0x7207, 0x7273, 0x7235, 0x7200, | |
150 | 0x7201, 0x7220, 0x7200, 0x7203, | |
151 | }; | |
152 | ||
153 | dev_dbg(ctx->panel.dev, "transfer gamma settings\n"); | |
154 | return lg4573_spi_write_u16_array(ctx, gamma_settings, | |
155 | ARRAY_SIZE(gamma_settings)); | |
156 | } | |
157 | ||
158 | static int lg4573_init(struct lg4573 *ctx) | |
159 | { | |
160 | int ret; | |
161 | ||
162 | dev_dbg(ctx->panel.dev, "initializing LCD\n"); | |
163 | ||
164 | ret = lg4573_display_mode_settings(ctx); | |
165 | if (ret) | |
166 | return ret; | |
167 | ||
168 | ret = lg4573_power_settings(ctx); | |
169 | if (ret) | |
170 | return ret; | |
171 | ||
172 | return lg4573_gamma_settings(ctx); | |
173 | } | |
174 | ||
175 | static int lg4573_power_on(struct lg4573 *ctx) | |
176 | { | |
177 | return lg4573_display_on(ctx); | |
178 | } | |
179 | ||
180 | static int lg4573_disable(struct drm_panel *panel) | |
181 | { | |
182 | struct lg4573 *ctx = panel_to_lg4573(panel); | |
183 | ||
184 | return lg4573_display_off(ctx); | |
185 | } | |
186 | ||
187 | static int lg4573_enable(struct drm_panel *panel) | |
188 | { | |
189 | struct lg4573 *ctx = panel_to_lg4573(panel); | |
190 | ||
191 | lg4573_init(ctx); | |
192 | ||
193 | return lg4573_power_on(ctx); | |
194 | } | |
195 | ||
196 | static const struct drm_display_mode default_mode = { | |
197 | .clock = 27000, | |
198 | .hdisplay = 480, | |
199 | .hsync_start = 480 + 10, | |
200 | .hsync_end = 480 + 10 + 59, | |
201 | .htotal = 480 + 10 + 59 + 10, | |
202 | .vdisplay = 800, | |
203 | .vsync_start = 800 + 15, | |
204 | .vsync_end = 800 + 15 + 15, | |
205 | .vtotal = 800 + 15 + 15 + 15, | |
206 | .vrefresh = 60, | |
207 | }; | |
208 | ||
209 | static int lg4573_get_modes(struct drm_panel *panel) | |
210 | { | |
211 | struct drm_connector *connector = panel->connector; | |
212 | struct drm_display_mode *mode; | |
213 | ||
214 | mode = drm_mode_duplicate(panel->drm, &default_mode); | |
215 | if (!mode) { | |
216 | dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n", | |
217 | default_mode.hdisplay, default_mode.vdisplay, | |
218 | default_mode.vrefresh); | |
219 | return -ENOMEM; | |
220 | } | |
221 | ||
222 | drm_mode_set_name(mode); | |
223 | ||
224 | mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; | |
225 | drm_mode_probed_add(connector, mode); | |
226 | ||
227 | panel->connector->display_info.width_mm = 61; | |
228 | panel->connector->display_info.height_mm = 103; | |
229 | ||
230 | return 1; | |
231 | } | |
232 | ||
233 | static const struct drm_panel_funcs lg4573_drm_funcs = { | |
234 | .disable = lg4573_disable, | |
235 | .enable = lg4573_enable, | |
236 | .get_modes = lg4573_get_modes, | |
237 | }; | |
238 | ||
239 | static int lg4573_probe(struct spi_device *spi) | |
240 | { | |
241 | struct lg4573 *ctx; | |
242 | int ret; | |
243 | ||
244 | ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL); | |
245 | if (!ctx) | |
246 | return -ENOMEM; | |
247 | ||
248 | ctx->spi = spi; | |
249 | ||
250 | spi_set_drvdata(spi, ctx); | |
251 | spi->bits_per_word = 8; | |
252 | ||
253 | ret = spi_setup(spi); | |
254 | if (ret < 0) { | |
255 | dev_err(&spi->dev, "SPI setup failed: %d\n", ret); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | drm_panel_init(&ctx->panel); | |
260 | ctx->panel.dev = &spi->dev; | |
261 | ctx->panel.funcs = &lg4573_drm_funcs; | |
262 | ||
263 | return drm_panel_add(&ctx->panel); | |
264 | } | |
265 | ||
266 | static int lg4573_remove(struct spi_device *spi) | |
267 | { | |
268 | struct lg4573 *ctx = spi_get_drvdata(spi); | |
269 | ||
270 | lg4573_display_off(ctx); | |
271 | drm_panel_remove(&ctx->panel); | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static const struct of_device_id lg4573_of_match[] = { | |
277 | { .compatible = "lg,lg4573" }, | |
278 | { } | |
279 | }; | |
280 | MODULE_DEVICE_TABLE(of, lg4573_of_match); | |
281 | ||
282 | static struct spi_driver lg4573_driver = { | |
283 | .probe = lg4573_probe, | |
284 | .remove = lg4573_remove, | |
285 | .driver = { | |
286 | .name = "lg4573", | |
58c467ec HS |
287 | .of_match_table = lg4573_of_match, |
288 | }, | |
289 | }; | |
290 | module_spi_driver(lg4573_driver); | |
291 | ||
292 | MODULE_AUTHOR("Heiko Schocher <hs@denx.de>"); | |
293 | MODULE_DESCRIPTION("lg4573 LCD Driver"); | |
294 | MODULE_LICENSE("GPL v2"); |