1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * LG.Philips LB035Q02 LCD Panel driver
4 *
5 * Copyright (C) 2013 Texas Instruments
6 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
7 * Based on a driver by: Steve Sakoman <steve@sakoman.com>
8 */
9
10 #include <linux/module.h>
11 #include <linux/delay.h>
12 #include <linux/spi/spi.h>
13 #include <linux/mutex.h>
14 #include <linux/gpio/consumer.h>
15
16 #include <video/omapfb_dss.h>
17
18 static const struct omap_video_timings lb035q02_timings = {
19 .x_res = 320,
20 .y_res = 240,
21
22 .pixelclock = 6500000,
23
24 .hsw = 2,
25 .hfp = 20,
26 .hbp = 68,
27
28 .vsw = 2,
29 .vfp = 4,
30 .vbp = 18,
31
32 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
33 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
34 .data_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
35 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
36 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
37 };
38
39 struct panel_drv_data {
40 struct omap_dss_device dssdev;
41 struct omap_dss_device *in;
42
43 struct spi_device *spi;
44
45 int data_lines;
46
47 struct omap_video_timings videomode;
48
49 struct gpio_desc *enable_gpio;
50 };
51
52 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
53
lb035q02_write_reg(struct spi_device * spi,u8 reg,u16 val)54 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
55 {
56 struct spi_message msg;
57 struct spi_transfer index_xfer = {
58 .len = 3,
59 .cs_change = 1,
60 };
61 struct spi_transfer value_xfer = {
62 .len = 3,
63 };
64 u8 buffer[16];
65
66 spi_message_init(&msg);
67
68 /* register index */
69 buffer[0] = 0x70;
70 buffer[1] = 0x00;
71 buffer[2] = reg & 0x7f;
72 index_xfer.tx_buf = buffer;
73 spi_message_add_tail(&index_xfer, &msg);
74
75 /* register value */
76 buffer[4] = 0x72;
77 buffer[5] = val >> 8;
78 buffer[6] = val;
79 value_xfer.tx_buf = buffer + 4;
80 spi_message_add_tail(&value_xfer, &msg);
81
82 return spi_sync(spi, &msg);
83 }
84
init_lb035q02_panel(struct spi_device * spi)85 static void init_lb035q02_panel(struct spi_device *spi)
86 {
87 /* Init sequence from page 28 of the lb035q02 spec */
88 lb035q02_write_reg(spi, 0x01, 0x6300);
89 lb035q02_write_reg(spi, 0x02, 0x0200);
90 lb035q02_write_reg(spi, 0x03, 0x0177);
91 lb035q02_write_reg(spi, 0x04, 0x04c7);
92 lb035q02_write_reg(spi, 0x05, 0xffc0);
93 lb035q02_write_reg(spi, 0x06, 0xe806);
94 lb035q02_write_reg(spi, 0x0a, 0x4008);
95 lb035q02_write_reg(spi, 0x0b, 0x0000);
96 lb035q02_write_reg(spi, 0x0d, 0x0030);
97 lb035q02_write_reg(spi, 0x0e, 0x2800);
98 lb035q02_write_reg(spi, 0x0f, 0x0000);
99 lb035q02_write_reg(spi, 0x16, 0x9f80);
100 lb035q02_write_reg(spi, 0x17, 0x0a0f);
101 lb035q02_write_reg(spi, 0x1e, 0x00c1);
102 lb035q02_write_reg(spi, 0x30, 0x0300);
103 lb035q02_write_reg(spi, 0x31, 0x0007);
104 lb035q02_write_reg(spi, 0x32, 0x0000);
105 lb035q02_write_reg(spi, 0x33, 0x0000);
106 lb035q02_write_reg(spi, 0x34, 0x0707);
107 lb035q02_write_reg(spi, 0x35, 0x0004);
108 lb035q02_write_reg(spi, 0x36, 0x0302);
109 lb035q02_write_reg(spi, 0x37, 0x0202);
110 lb035q02_write_reg(spi, 0x3a, 0x0a0d);
111 lb035q02_write_reg(spi, 0x3b, 0x0806);
112 }
113
lb035q02_connect(struct omap_dss_device * dssdev)114 static int lb035q02_connect(struct omap_dss_device *dssdev)
115 {
116 struct panel_drv_data *ddata = to_panel_data(dssdev);
117 struct omap_dss_device *in = ddata->in;
118 int r;
119
120 if (omapdss_device_is_connected(dssdev))
121 return 0;
122
123 r = in->ops.dpi->connect(in, dssdev);
124 if (r)
125 return r;
126
127 init_lb035q02_panel(ddata->spi);
128
129 return 0;
130 }
131
lb035q02_disconnect(struct omap_dss_device * dssdev)132 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
133 {
134 struct panel_drv_data *ddata = to_panel_data(dssdev);
135 struct omap_dss_device *in = ddata->in;
136
137 if (!omapdss_device_is_connected(dssdev))
138 return;
139
140 in->ops.dpi->disconnect(in, dssdev);
141 }
142
lb035q02_enable(struct omap_dss_device * dssdev)143 static int lb035q02_enable(struct omap_dss_device *dssdev)
144 {
145 struct panel_drv_data *ddata = to_panel_data(dssdev);
146 struct omap_dss_device *in = ddata->in;
147 int r;
148
149 if (!omapdss_device_is_connected(dssdev))
150 return -ENODEV;
151
152 if (omapdss_device_is_enabled(dssdev))
153 return 0;
154
155 if (ddata->data_lines)
156 in->ops.dpi->set_data_lines(in, ddata->data_lines);
157 in->ops.dpi->set_timings(in, &ddata->videomode);
158
159 r = in->ops.dpi->enable(in);
160 if (r)
161 return r;
162
163 if (ddata->enable_gpio)
164 gpiod_set_value_cansleep(ddata->enable_gpio, 1);
165
166 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
167
168 return 0;
169 }
170
lb035q02_disable(struct omap_dss_device * dssdev)171 static void lb035q02_disable(struct omap_dss_device *dssdev)
172 {
173 struct panel_drv_data *ddata = to_panel_data(dssdev);
174 struct omap_dss_device *in = ddata->in;
175
176 if (!omapdss_device_is_enabled(dssdev))
177 return;
178
179 if (ddata->enable_gpio)
180 gpiod_set_value_cansleep(ddata->enable_gpio, 0);
181
182 in->ops.dpi->disable(in);
183
184 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
185 }
186
lb035q02_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)187 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
188 struct omap_video_timings *timings)
189 {
190 struct panel_drv_data *ddata = to_panel_data(dssdev);
191 struct omap_dss_device *in = ddata->in;
192
193 ddata->videomode = *timings;
194 dssdev->panel.timings = *timings;
195
196 in->ops.dpi->set_timings(in, timings);
197 }
198
lb035q02_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)199 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
200 struct omap_video_timings *timings)
201 {
202 struct panel_drv_data *ddata = to_panel_data(dssdev);
203
204 *timings = ddata->videomode;
205 }
206
lb035q02_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)207 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
208 struct omap_video_timings *timings)
209 {
210 struct panel_drv_data *ddata = to_panel_data(dssdev);
211 struct omap_dss_device *in = ddata->in;
212
213 return in->ops.dpi->check_timings(in, timings);
214 }
215
216 static struct omap_dss_driver lb035q02_ops = {
217 .connect = lb035q02_connect,
218 .disconnect = lb035q02_disconnect,
219
220 .enable = lb035q02_enable,
221 .disable = lb035q02_disable,
222
223 .set_timings = lb035q02_set_timings,
224 .get_timings = lb035q02_get_timings,
225 .check_timings = lb035q02_check_timings,
226
227 .get_resolution = omapdss_default_get_resolution,
228 };
229
lb035q02_probe_of(struct spi_device * spi)230 static int lb035q02_probe_of(struct spi_device *spi)
231 {
232 struct device_node *node = spi->dev.of_node;
233 struct panel_drv_data *ddata = spi_get_drvdata(spi);
234 struct omap_dss_device *in;
235 struct gpio_desc *gpio;
236
237 gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
238 if (IS_ERR(gpio))
239 return dev_err_probe(&spi->dev, PTR_ERR(gpio),
240 "failed to parse enable gpio\n");
241
242 ddata->enable_gpio = gpio;
243
244 in = omapdss_of_find_source_for_first_ep(node);
245 if (IS_ERR(in)) {
246 dev_err(&spi->dev, "failed to find video source\n");
247 return PTR_ERR(in);
248 }
249
250 ddata->in = in;
251
252 return 0;
253 }
254
lb035q02_panel_spi_probe(struct spi_device * spi)255 static int lb035q02_panel_spi_probe(struct spi_device *spi)
256 {
257 struct panel_drv_data *ddata;
258 struct omap_dss_device *dssdev;
259 int r;
260
261 if (!spi->dev.of_node)
262 return -ENODEV;
263
264 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
265 if (ddata == NULL)
266 return -ENOMEM;
267
268 spi_set_drvdata(spi, ddata);
269
270 ddata->spi = spi;
271
272 r = lb035q02_probe_of(spi);
273 if (r)
274 return r;
275
276 ddata->videomode = lb035q02_timings;
277
278 dssdev = &ddata->dssdev;
279 dssdev->dev = &spi->dev;
280 dssdev->driver = &lb035q02_ops;
281 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
282 dssdev->owner = THIS_MODULE;
283 dssdev->panel.timings = ddata->videomode;
284 dssdev->phy.dpi.data_lines = ddata->data_lines;
285
286 r = omapdss_register_display(dssdev);
287 if (r) {
288 dev_err(&spi->dev, "Failed to register panel\n");
289 goto err_reg;
290 }
291
292 return 0;
293
294 err_reg:
295 omap_dss_put_device(ddata->in);
296 return r;
297 }
298
lb035q02_panel_spi_remove(struct spi_device * spi)299 static void lb035q02_panel_spi_remove(struct spi_device *spi)
300 {
301 struct panel_drv_data *ddata = spi_get_drvdata(spi);
302 struct omap_dss_device *dssdev = &ddata->dssdev;
303 struct omap_dss_device *in = ddata->in;
304
305 omapdss_unregister_display(dssdev);
306
307 lb035q02_disable(dssdev);
308 lb035q02_disconnect(dssdev);
309
310 omap_dss_put_device(in);
311 }
312
313 static const struct of_device_id lb035q02_of_match[] = {
314 { .compatible = "omapdss,lgphilips,lb035q02", },
315 {},
316 };
317
318 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
319
320 static struct spi_driver lb035q02_spi_driver = {
321 .probe = lb035q02_panel_spi_probe,
322 .remove = lb035q02_panel_spi_remove,
323 .driver = {
324 .name = "panel_lgphilips_lb035q02",
325 .of_match_table = lb035q02_of_match,
326 .suppress_bind_attrs = true,
327 },
328 };
329
330 module_spi_driver(lb035q02_spi_driver);
331
332 MODULE_ALIAS("spi:lgphilips,lb035q02");
333 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
334 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
335 MODULE_LICENSE("GPL");
336