drm/connector: Change DRM card alias from underscore to hyphen
[platform/kernel/linux-rpi.git] / drivers / gpu / drm / panel / panel-samsung-ld9040.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * ld9040 AMOLED LCD drm_panel driver.
4  *
5  * Copyright (c) 2014 Samsung Electronics Co., Ltd
6  * Derived from drivers/video/backlight/ld9040.c
7  *
8  * Andrzej Hajda <a.hajda@samsung.com>
9 */
10
11 #include <linux/backlight.h>
12 #include <linux/delay.h>
13 #include <linux/gpio/consumer.h>
14 #include <linux/module.h>
15 #include <linux/of.h>
16 #include <linux/regulator/consumer.h>
17 #include <linux/spi/spi.h>
18
19 #include <video/mipi_display.h>
20 #include <video/of_videomode.h>
21 #include <video/videomode.h>
22
23 #include <drm/drm_modes.h>
24 #include <drm/drm_panel.h>
25
26 /* Manufacturer Command Set */
27 #define MCS_MANPWR              0xb0
28 #define MCS_ELVSS_ON            0xb1
29 #define MCS_USER_SETTING        0xf0
30 #define MCS_DISPCTL             0xf2
31 #define MCS_POWER_CTRL          0xf4
32 #define MCS_GTCON               0xf7
33 #define MCS_PANEL_CONDITION     0xf8
34 #define MCS_GAMMA_SET1          0xf9
35 #define MCS_GAMMA_CTRL          0xfb
36
37 /* array of gamma tables for gamma value 2.2 */
38 static u8 const ld9040_gammas[25][22] = {
39         { 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0,
40           0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 },
41         { 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf,
42           0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 },
43         { 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe,
44           0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 },
45         { 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc,
46           0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d },
47         { 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc,
48           0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 },
49         { 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb,
50           0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 },
51         { 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb,
52           0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c },
53         { 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb,
54           0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 },
55         { 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba,
56           0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 },
57         { 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba,
58           0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a },
59         { 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba,
60           0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e },
61         { 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8,
62           0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 },
63         { 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9,
64           0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 },
65         { 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8,
66           0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 },
67         { 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8,
68           0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d },
69         { 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8,
70           0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 },
71         { 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8,
72           0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 },
73         { 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7,
74           0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 },
75         { 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7,
76           0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a },
77         { 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6,
78           0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d },
79         { 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6,
80           0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 },
81         { 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7,
82           0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 },
83         { 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5,
84           0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 },
85         { 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6,
86           0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa },
87         { 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4,
88           0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 },
89 };
90
91 struct ld9040 {
92         struct device *dev;
93         struct drm_panel panel;
94
95         struct regulator_bulk_data supplies[2];
96         struct gpio_desc *reset_gpio;
97         u32 power_on_delay;
98         u32 reset_delay;
99         struct videomode vm;
100         u32 width_mm;
101         u32 height_mm;
102
103         int brightness;
104
105         /* This field is tested by functions directly accessing bus before
106          * transfer, transfer is skipped if it is set. In case of transfer
107          * failure or unexpected response the field is set to error value.
108          * Such construct allows to eliminate many checks in higher level
109          * functions.
110          */
111         int error;
112 };
113
114 static inline struct ld9040 *panel_to_ld9040(struct drm_panel *panel)
115 {
116         return container_of(panel, struct ld9040, panel);
117 }
118
119 static int ld9040_clear_error(struct ld9040 *ctx)
120 {
121         int ret = ctx->error;
122
123         ctx->error = 0;
124         return ret;
125 }
126
127 static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data)
128 {
129         struct spi_device *spi = to_spi_device(ctx->dev);
130         struct spi_transfer xfer = {
131                 .len            = 2,
132                 .tx_buf         = &data,
133         };
134         struct spi_message msg;
135
136         spi_message_init(&msg);
137         spi_message_add_tail(&xfer, &msg);
138
139         return spi_sync(spi, &msg);
140 }
141
142 static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len)
143 {
144         int ret = 0;
145
146         if (ctx->error < 0 || len == 0)
147                 return;
148
149         dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
150         ret = ld9040_spi_write_word(ctx, *data);
151
152         while (!ret && --len) {
153                 ++data;
154                 ret = ld9040_spi_write_word(ctx, *data | 0x100);
155         }
156
157         if (ret) {
158                 dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
159                         (int)len, data);
160                 ctx->error = ret;
161         }
162
163         usleep_range(300, 310);
164 }
165
166 #define ld9040_dcs_write_seq_static(ctx, seq...) \
167 ({\
168         static const u8 d[] = { seq };\
169         ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\
170 })
171
172 static void ld9040_brightness_set(struct ld9040 *ctx)
173 {
174         ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness],
175                          ARRAY_SIZE(ld9040_gammas[ctx->brightness]));
176
177         ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a);
178 }
179
180 static void ld9040_init(struct ld9040 *ctx)
181 {
182         ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a);
183         ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
184                 0x05, 0x5e, 0x96, 0x6b, 0x7d, 0x0d, 0x3f, 0x00,
185                 0x00, 0x32, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
186                 0x07, 0x05, 0x1f, 0x1f, 0x1f, 0x00, 0x00);
187         ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL,
188                 0x02, 0x06, 0x0a, 0x10, 0x10);
189         ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04);
190         ld9040_dcs_write_seq_static(ctx, MCS_POWER_CTRL,
191                 0x0a, 0x87, 0x25, 0x6a, 0x44, 0x02, 0x88);
192         ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0f, 0x00, 0x16);
193         ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00);
194         ld9040_brightness_set(ctx);
195         ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
196         ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
197 }
198
199 static int ld9040_power_on(struct ld9040 *ctx)
200 {
201         int ret;
202
203         ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
204         if (ret < 0)
205                 return ret;
206
207         msleep(ctx->power_on_delay);
208         gpiod_set_value(ctx->reset_gpio, 0);
209         msleep(ctx->reset_delay);
210         gpiod_set_value(ctx->reset_gpio, 1);
211         msleep(ctx->reset_delay);
212
213         return 0;
214 }
215
216 static int ld9040_power_off(struct ld9040 *ctx)
217 {
218         return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
219 }
220
221 static int ld9040_disable(struct drm_panel *panel)
222 {
223         return 0;
224 }
225
226 static int ld9040_unprepare(struct drm_panel *panel)
227 {
228         struct ld9040 *ctx = panel_to_ld9040(panel);
229
230         msleep(120);
231         ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
232         ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
233         msleep(40);
234
235         ld9040_clear_error(ctx);
236
237         return ld9040_power_off(ctx);
238 }
239
240 static int ld9040_prepare(struct drm_panel *panel)
241 {
242         struct ld9040 *ctx = panel_to_ld9040(panel);
243         int ret;
244
245         ret = ld9040_power_on(ctx);
246         if (ret < 0)
247                 return ret;
248
249         ld9040_init(ctx);
250
251         ret = ld9040_clear_error(ctx);
252
253         if (ret < 0)
254                 ld9040_unprepare(panel);
255
256         return ret;
257 }
258
259 static int ld9040_enable(struct drm_panel *panel)
260 {
261         return 0;
262 }
263
264 static int ld9040_get_modes(struct drm_panel *panel,
265                             struct drm_connector *connector)
266 {
267         struct ld9040 *ctx = panel_to_ld9040(panel);
268         struct drm_display_mode *mode;
269
270         mode = drm_mode_create(connector->dev);
271         if (!mode) {
272                 dev_err(panel->dev, "failed to create a new display mode\n");
273                 return 0;
274         }
275
276         drm_display_mode_from_videomode(&ctx->vm, mode);
277         mode->width_mm = ctx->width_mm;
278         mode->height_mm = ctx->height_mm;
279         connector->display_info.width_mm = mode->width_mm;
280         connector->display_info.height_mm = mode->height_mm;
281
282         mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
283         drm_mode_probed_add(connector, mode);
284
285         return 1;
286 }
287
288 static const struct drm_panel_funcs ld9040_drm_funcs = {
289         .disable = ld9040_disable,
290         .unprepare = ld9040_unprepare,
291         .prepare = ld9040_prepare,
292         .enable = ld9040_enable,
293         .get_modes = ld9040_get_modes,
294 };
295
296 static int ld9040_parse_dt(struct ld9040 *ctx)
297 {
298         struct device *dev = ctx->dev;
299         struct device_node *np = dev->of_node;
300         int ret;
301
302         ret = of_get_videomode(np, &ctx->vm, 0);
303         if (ret < 0)
304                 return ret;
305
306         of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
307         of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
308         of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
309         of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
310
311         return 0;
312 }
313
314 static int ld9040_bl_update_status(struct backlight_device *dev)
315 {
316         struct ld9040 *ctx = bl_get_data(dev);
317
318         ctx->brightness = backlight_get_brightness(dev);
319         ld9040_brightness_set(ctx);
320
321         return 0;
322 }
323
324 static const struct backlight_ops ld9040_bl_ops = {
325         .update_status  = ld9040_bl_update_status,
326 };
327
328 static const struct backlight_properties ld9040_bl_props = {
329         .type = BACKLIGHT_RAW,
330         .scale = BACKLIGHT_SCALE_NON_LINEAR,
331         .max_brightness = ARRAY_SIZE(ld9040_gammas) - 1,
332         .brightness = ARRAY_SIZE(ld9040_gammas) - 1,
333 };
334
335 static int ld9040_probe(struct spi_device *spi)
336 {
337         struct backlight_device *bldev;
338         struct device *dev = &spi->dev;
339         struct ld9040 *ctx;
340         int ret;
341
342         ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);
343         if (!ctx)
344                 return -ENOMEM;
345
346         spi_set_drvdata(spi, ctx);
347
348         ctx->dev = dev;
349         ctx->brightness = ld9040_bl_props.brightness;
350
351         ret = ld9040_parse_dt(ctx);
352         if (ret < 0)
353                 return ret;
354
355         ctx->supplies[0].supply = "vdd3";
356         ctx->supplies[1].supply = "vci";
357         ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
358                                       ctx->supplies);
359         if (ret < 0)
360                 return ret;
361
362         ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
363         if (IS_ERR(ctx->reset_gpio)) {
364                 dev_err(dev, "cannot get reset-gpios %ld\n",
365                         PTR_ERR(ctx->reset_gpio));
366                 return PTR_ERR(ctx->reset_gpio);
367         }
368
369         spi->bits_per_word = 9;
370         ret = spi_setup(spi);
371         if (ret < 0) {
372                 dev_err(dev, "spi setup failed.\n");
373                 return ret;
374         }
375
376         drm_panel_init(&ctx->panel, dev, &ld9040_drm_funcs,
377                        DRM_MODE_CONNECTOR_DPI);
378
379         bldev = devm_backlight_device_register(dev, dev_name(dev), dev,
380                                                ctx, &ld9040_bl_ops,
381                                                &ld9040_bl_props);
382         if (IS_ERR(bldev))
383                 return PTR_ERR(bldev);
384
385         drm_panel_add(&ctx->panel);
386
387         return 0;
388 }
389
390 static void ld9040_remove(struct spi_device *spi)
391 {
392         struct ld9040 *ctx = spi_get_drvdata(spi);
393
394         ld9040_power_off(ctx);
395         drm_panel_remove(&ctx->panel);
396 }
397
398 static const struct of_device_id ld9040_of_match[] = {
399         { .compatible = "samsung,ld9040" },
400         { }
401 };
402 MODULE_DEVICE_TABLE(of, ld9040_of_match);
403
404 static const struct spi_device_id ld9040_ids[] = {
405         { "ld9040", },
406         { /* sentinel */ }
407 };
408 MODULE_DEVICE_TABLE(spi, ld9040_ids);
409
410 static struct spi_driver ld9040_driver = {
411         .probe = ld9040_probe,
412         .remove = ld9040_remove,
413         .id_table = ld9040_ids,
414         .driver = {
415                 .name = "panel-samsung-ld9040",
416                 .of_match_table = ld9040_of_match,
417         },
418 };
419 module_spi_driver(ld9040_driver);
420
421 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
422 MODULE_DESCRIPTION("ld9040 LCD Driver");
423 MODULE_LICENSE("GPL v2");