2 * ld9040 AMOLED LCD drm_panel driver.
4 * Copyright (c) 2014 Samsung Electronics Co., Ltd
5 * Derived from drivers/video/backlight/ld9040.c
7 * Andrzej Hajda <a.hajda@samsung.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 #include <drm/drm_panel.h>
17 #include <linux/gpio/consumer.h>
18 #include <linux/regulator/consumer.h>
19 #include <linux/spi/spi.h>
21 #include <video/mipi_display.h>
22 #include <video/of_videomode.h>
23 #include <video/videomode.h>
25 /* Manufacturer Command Set */
26 #define MCS_MANPWR 0xb0
27 #define MCS_ELVSS_ON 0xb1
28 #define MCS_USER_SETTING 0xf0
29 #define MCS_DISPCTL 0xf2
30 #define MCS_POWER_CTRL 0xf4
31 #define MCS_GTCON 0xf7
32 #define MCS_PANEL_CONDITION 0xf8
33 #define MCS_GAMMA_SET1 0xf9
34 #define MCS_GAMMA_CTRL 0xfb
36 /* array of gamma tables for gamma value 2.2 */
37 static u8 const ld9040_gammas[25][22] = {
38 { 0xf9, 0x00, 0x13, 0xb2, 0xba, 0xd2, 0x00, 0x30, 0x00, 0xaf, 0xc0,
39 0xb8, 0xcd, 0x00, 0x3d, 0x00, 0xa8, 0xb8, 0xb7, 0xcd, 0x00, 0x44 },
40 { 0xf9, 0x00, 0x13, 0xb9, 0xb9, 0xd0, 0x00, 0x3c, 0x00, 0xaf, 0xbf,
41 0xb6, 0xcb, 0x00, 0x4b, 0x00, 0xa8, 0xb9, 0xb5, 0xcc, 0x00, 0x52 },
42 { 0xf9, 0x00, 0x13, 0xba, 0xb9, 0xcd, 0x00, 0x41, 0x00, 0xb0, 0xbe,
43 0xb5, 0xc9, 0x00, 0x51, 0x00, 0xa9, 0xb9, 0xb5, 0xca, 0x00, 0x57 },
44 { 0xf9, 0x00, 0x13, 0xb9, 0xb8, 0xcd, 0x00, 0x46, 0x00, 0xb1, 0xbc,
45 0xb5, 0xc8, 0x00, 0x56, 0x00, 0xaa, 0xb8, 0xb4, 0xc9, 0x00, 0x5d },
46 { 0xf9, 0x00, 0x13, 0xba, 0xb8, 0xcb, 0x00, 0x4b, 0x00, 0xb3, 0xbc,
47 0xb4, 0xc7, 0x00, 0x5c, 0x00, 0xac, 0xb8, 0xb4, 0xc8, 0x00, 0x62 },
48 { 0xf9, 0x00, 0x13, 0xbb, 0xb7, 0xca, 0x00, 0x4f, 0x00, 0xb4, 0xbb,
49 0xb3, 0xc7, 0x00, 0x60, 0x00, 0xad, 0xb8, 0xb4, 0xc7, 0x00, 0x67 },
50 { 0xf9, 0x00, 0x47, 0xba, 0xb6, 0xca, 0x00, 0x53, 0x00, 0xb5, 0xbb,
51 0xb3, 0xc6, 0x00, 0x65, 0x00, 0xae, 0xb8, 0xb3, 0xc7, 0x00, 0x6c },
52 { 0xf9, 0x00, 0x71, 0xbb, 0xb5, 0xc8, 0x00, 0x57, 0x00, 0xb5, 0xbb,
53 0xb0, 0xc5, 0x00, 0x6a, 0x00, 0xae, 0xb9, 0xb1, 0xc6, 0x00, 0x70 },
54 { 0xf9, 0x00, 0x7b, 0xbb, 0xb4, 0xc8, 0x00, 0x5b, 0x00, 0xb5, 0xba,
55 0xb1, 0xc4, 0x00, 0x6e, 0x00, 0xae, 0xb9, 0xb0, 0xc5, 0x00, 0x75 },
56 { 0xf9, 0x00, 0x82, 0xba, 0xb4, 0xc7, 0x00, 0x5f, 0x00, 0xb5, 0xba,
57 0xb0, 0xc3, 0x00, 0x72, 0x00, 0xae, 0xb8, 0xb0, 0xc3, 0x00, 0x7a },
58 { 0xf9, 0x00, 0x89, 0xba, 0xb3, 0xc8, 0x00, 0x62, 0x00, 0xb6, 0xba,
59 0xaf, 0xc3, 0x00, 0x76, 0x00, 0xaf, 0xb7, 0xae, 0xc4, 0x00, 0x7e },
60 { 0xf9, 0x00, 0x8b, 0xb9, 0xb3, 0xc7, 0x00, 0x65, 0x00, 0xb7, 0xb8,
61 0xaf, 0xc3, 0x00, 0x7a, 0x00, 0x80, 0xb6, 0xae, 0xc4, 0x00, 0x81 },
62 { 0xf9, 0x00, 0x93, 0xba, 0xb3, 0xc5, 0x00, 0x69, 0x00, 0xb8, 0xb9,
63 0xae, 0xc1, 0x00, 0x7f, 0x00, 0xb0, 0xb6, 0xae, 0xc3, 0x00, 0x85 },
64 { 0xf9, 0x00, 0x97, 0xba, 0xb2, 0xc5, 0x00, 0x6c, 0x00, 0xb8, 0xb8,
65 0xae, 0xc1, 0x00, 0x82, 0x00, 0xb0, 0xb6, 0xae, 0xc2, 0x00, 0x89 },
66 { 0xf9, 0x00, 0x9a, 0xba, 0xb1, 0xc4, 0x00, 0x6f, 0x00, 0xb8, 0xb8,
67 0xad, 0xc0, 0x00, 0x86, 0x00, 0xb0, 0xb7, 0xad, 0xc0, 0x00, 0x8d },
68 { 0xf9, 0x00, 0x9c, 0xb9, 0xb0, 0xc4, 0x00, 0x72, 0x00, 0xb8, 0xb8,
69 0xac, 0xbf, 0x00, 0x8a, 0x00, 0xb0, 0xb6, 0xac, 0xc0, 0x00, 0x91 },
70 { 0xf9, 0x00, 0x9e, 0xba, 0xb0, 0xc2, 0x00, 0x75, 0x00, 0xb9, 0xb8,
71 0xab, 0xbe, 0x00, 0x8e, 0x00, 0xb0, 0xb6, 0xac, 0xbf, 0x00, 0x94 },
72 { 0xf9, 0x00, 0xa0, 0xb9, 0xaf, 0xc3, 0x00, 0x77, 0x00, 0xb9, 0xb7,
73 0xab, 0xbe, 0x00, 0x90, 0x00, 0xb0, 0xb6, 0xab, 0xbf, 0x00, 0x97 },
74 { 0xf9, 0x00, 0xa2, 0xb9, 0xaf, 0xc2, 0x00, 0x7a, 0x00, 0xb9, 0xb7,
75 0xaa, 0xbd, 0x00, 0x94, 0x00, 0xb0, 0xb5, 0xab, 0xbf, 0x00, 0x9a },
76 { 0xf9, 0x00, 0xa4, 0xb9, 0xaf, 0xc1, 0x00, 0x7d, 0x00, 0xb9, 0xb6,
77 0xaa, 0xbb, 0x00, 0x97, 0x00, 0xb1, 0xb5, 0xaa, 0xbf, 0x00, 0x9d },
78 { 0xf9, 0x00, 0xa4, 0xb8, 0xb0, 0xbf, 0x00, 0x80, 0x00, 0xb8, 0xb6,
79 0xaa, 0xbc, 0x00, 0x9a, 0x00, 0xb0, 0xb5, 0xab, 0xbd, 0x00, 0xa0 },
80 { 0xf9, 0x00, 0xa8, 0xb8, 0xae, 0xbe, 0x00, 0x84, 0x00, 0xb9, 0xb7,
81 0xa8, 0xbc, 0x00, 0x9d, 0x00, 0xb2, 0xb5, 0xaa, 0xbc, 0x00, 0xa4 },
82 { 0xf9, 0x00, 0xa9, 0xb6, 0xad, 0xbf, 0x00, 0x86, 0x00, 0xb8, 0xb5,
83 0xa8, 0xbc, 0x00, 0xa0, 0x00, 0xb3, 0xb3, 0xa9, 0xbc, 0x00, 0xa7 },
84 { 0xf9, 0x00, 0xa9, 0xb7, 0xae, 0xbd, 0x00, 0x89, 0x00, 0xb7, 0xb6,
85 0xa8, 0xba, 0x00, 0xa4, 0x00, 0xb1, 0xb4, 0xaa, 0xbb, 0x00, 0xaa },
86 { 0xf9, 0x00, 0xa7, 0xb4, 0xae, 0xbf, 0x00, 0x91, 0x00, 0xb2, 0xb4,
87 0xaa, 0xbb, 0x00, 0xac, 0x00, 0xb3, 0xb1, 0xaa, 0xbc, 0x00, 0xb3 },
92 struct drm_panel panel;
94 struct regulator_bulk_data supplies[2];
95 struct gpio_desc *reset_gpio;
104 /* This field is tested by functions directly accessing bus before
105 * transfer, transfer is skipped if it is set. In case of transfer
106 * failure or unexpected response the field is set to error value.
107 * Such construct allows to eliminate many checks in higher level
113 #define panel_to_ld9040(p) container_of(p, struct ld9040, panel)
115 static int ld9040_clear_error(struct ld9040 *ctx)
117 int ret = ctx->error;
123 static int ld9040_spi_write_word(struct ld9040 *ctx, u16 data)
125 struct spi_device *spi = to_spi_device(ctx->dev);
126 struct spi_transfer xfer = {
130 struct spi_message msg;
132 spi_message_init(&msg);
133 spi_message_add_tail(&xfer, &msg);
135 return spi_sync(spi, &msg);
138 static void ld9040_dcs_write(struct ld9040 *ctx, const u8 *data, size_t len)
142 if (ctx->error < 0 || len == 0)
145 dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", len, data);
146 ret = ld9040_spi_write_word(ctx, *data);
148 while (!ret && --len) {
150 ret = ld9040_spi_write_word(ctx, *data | 0x100);
154 dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret, len,
159 usleep_range(300, 310);
162 #define ld9040_dcs_write_seq_static(ctx, seq...) \
164 static const u8 d[] = { seq };\
165 ld9040_dcs_write(ctx, d, ARRAY_SIZE(d));\
168 static void ld9040_brightness_set(struct ld9040 *ctx)
170 ld9040_dcs_write(ctx, ld9040_gammas[ctx->brightness],
171 ARRAY_SIZE(ld9040_gammas[ctx->brightness]));
173 ld9040_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x02, 0x5a);
176 static void ld9040_init(struct ld9040 *ctx)
178 ld9040_dcs_write_seq_static(ctx, MCS_USER_SETTING, 0x5a, 0x5a);
179 ld9040_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
180 0x05, 0x65, 0x96, 0x71, 0x7d, 0x19, 0x3b, 0x0d,
181 0x19, 0x7e, 0x0d, 0xe2, 0x00, 0x00, 0x7e, 0x7d,
182 0x07, 0x07, 0x20, 0x20, 0x20, 0x02, 0x02);
183 ld9040_dcs_write_seq_static(ctx, MCS_DISPCTL,
184 0x02, 0x08, 0x08, 0x10, 0x10);
185 ld9040_dcs_write_seq_static(ctx, MCS_MANPWR, 0x04);
186 ld9040_dcs_write_seq_static(ctx, MCS_POWER_CTRL,
187 0x0a, 0x87, 0x25, 0x6a, 0x44, 0x02, 0x88);
188 ld9040_dcs_write_seq_static(ctx, MCS_ELVSS_ON, 0x0d, 0x00, 0x16);
189 ld9040_dcs_write_seq_static(ctx, MCS_GTCON, 0x09, 0x00, 0x00);
190 ld9040_brightness_set(ctx);
191 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
192 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
195 static int ld9040_power_on(struct ld9040 *ctx)
199 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
203 msleep(ctx->power_on_delay);
204 gpiod_set_value(ctx->reset_gpio, 0);
205 msleep(ctx->reset_delay);
206 gpiod_set_value(ctx->reset_gpio, 1);
207 msleep(ctx->reset_delay);
212 static int ld9040_power_off(struct ld9040 *ctx)
214 return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
217 static int ld9040_disable(struct drm_panel *panel)
219 struct ld9040 *ctx = panel_to_ld9040(panel);
222 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
223 ld9040_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
226 ld9040_clear_error(ctx);
228 return ld9040_power_off(ctx);
231 static int ld9040_enable(struct drm_panel *panel)
233 struct ld9040 *ctx = panel_to_ld9040(panel);
236 ret = ld9040_power_on(ctx);
242 ret = ld9040_clear_error(ctx);
245 ld9040_disable(panel);
250 static int ld9040_get_modes(struct drm_panel *panel)
252 struct drm_connector *connector = panel->connector;
253 struct ld9040 *ctx = panel_to_ld9040(panel);
254 struct drm_display_mode *mode;
256 mode = drm_mode_create(connector->dev);
258 DRM_ERROR("failed to create a new display mode\n");
262 drm_display_mode_from_videomode(&ctx->vm, mode);
263 mode->width_mm = ctx->width_mm;
264 mode->height_mm = ctx->height_mm;
265 connector->display_info.width_mm = mode->width_mm;
266 connector->display_info.height_mm = mode->height_mm;
268 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
269 drm_mode_probed_add(connector, mode);
274 static const struct drm_panel_funcs ld9040_drm_funcs = {
275 .disable = ld9040_disable,
276 .enable = ld9040_enable,
277 .get_modes = ld9040_get_modes,
280 static int ld9040_parse_dt(struct ld9040 *ctx)
282 struct device *dev = ctx->dev;
283 struct device_node *np = dev->of_node;
286 ret = of_get_videomode(np, &ctx->vm, 0);
290 of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
291 of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
292 of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
293 of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
298 static int ld9040_probe(struct spi_device *spi)
300 struct device *dev = &spi->dev;
304 ctx = devm_kzalloc(dev, sizeof(struct ld9040), GFP_KERNEL);
308 spi_set_drvdata(spi, ctx);
311 ctx->brightness = ARRAY_SIZE(ld9040_gammas) - 1;
313 ret = ld9040_parse_dt(ctx);
317 ctx->supplies[0].supply = "vdd3";
318 ctx->supplies[1].supply = "vci";
319 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
324 ctx->reset_gpio = devm_gpiod_get(dev, "reset");
325 if (IS_ERR(ctx->reset_gpio)) {
326 dev_err(dev, "cannot get reset-gpios %ld\n",
327 PTR_ERR(ctx->reset_gpio));
328 return PTR_ERR(ctx->reset_gpio);
330 ret = gpiod_direction_output(ctx->reset_gpio, 1);
332 dev_err(dev, "cannot configure reset-gpios %d\n", ret);
336 spi->bits_per_word = 9;
337 ret = spi_setup(spi);
339 dev_err(dev, "spi setup failed.\n");
343 drm_panel_init(&ctx->panel);
344 ctx->panel.dev = dev;
345 ctx->panel.funcs = &ld9040_drm_funcs;
347 return drm_panel_add(&ctx->panel);
350 static int ld9040_remove(struct spi_device *spi)
352 struct ld9040 *ctx = spi_get_drvdata(spi);
354 ld9040_power_off(ctx);
355 drm_panel_remove(&ctx->panel);
360 static struct of_device_id ld9040_of_match[] = {
361 { .compatible = "samsung,ld9040" },
364 MODULE_DEVICE_TABLE(of, ld9040_of_match);
366 static struct spi_driver ld9040_driver = {
367 .probe = ld9040_probe,
368 .remove = ld9040_remove,
371 .owner = THIS_MODULE,
372 .of_match_table = ld9040_of_match,
375 module_spi_driver(ld9040_driver);
377 MODULE_AUTHOR("Andrzej Hajda <a.hajda@samsung.com>");
378 MODULE_DESCRIPTION("ld9040 LCD Driver");
379 MODULE_LICENSE("GPL v2");