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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.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 	/* used for non-DT boot, to be removed */
50 	int backlight_gpio;
51 
52 	struct gpio_desc *enable_gpio;
53 };
54 
55 #define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
56 
lb035q02_write_reg(struct spi_device * spi,u8 reg,u16 val)57 static int lb035q02_write_reg(struct spi_device *spi, u8 reg, u16 val)
58 {
59 	struct spi_message msg;
60 	struct spi_transfer index_xfer = {
61 		.len		= 3,
62 		.cs_change	= 1,
63 	};
64 	struct spi_transfer value_xfer = {
65 		.len		= 3,
66 	};
67 	u8	buffer[16];
68 
69 	spi_message_init(&msg);
70 
71 	/* register index */
72 	buffer[0] = 0x70;
73 	buffer[1] = 0x00;
74 	buffer[2] = reg & 0x7f;
75 	index_xfer.tx_buf = buffer;
76 	spi_message_add_tail(&index_xfer, &msg);
77 
78 	/* register value */
79 	buffer[4] = 0x72;
80 	buffer[5] = val >> 8;
81 	buffer[6] = val;
82 	value_xfer.tx_buf = buffer + 4;
83 	spi_message_add_tail(&value_xfer, &msg);
84 
85 	return spi_sync(spi, &msg);
86 }
87 
init_lb035q02_panel(struct spi_device * spi)88 static void init_lb035q02_panel(struct spi_device *spi)
89 {
90 	/* Init sequence from page 28 of the lb035q02 spec */
91 	lb035q02_write_reg(spi, 0x01, 0x6300);
92 	lb035q02_write_reg(spi, 0x02, 0x0200);
93 	lb035q02_write_reg(spi, 0x03, 0x0177);
94 	lb035q02_write_reg(spi, 0x04, 0x04c7);
95 	lb035q02_write_reg(spi, 0x05, 0xffc0);
96 	lb035q02_write_reg(spi, 0x06, 0xe806);
97 	lb035q02_write_reg(spi, 0x0a, 0x4008);
98 	lb035q02_write_reg(spi, 0x0b, 0x0000);
99 	lb035q02_write_reg(spi, 0x0d, 0x0030);
100 	lb035q02_write_reg(spi, 0x0e, 0x2800);
101 	lb035q02_write_reg(spi, 0x0f, 0x0000);
102 	lb035q02_write_reg(spi, 0x16, 0x9f80);
103 	lb035q02_write_reg(spi, 0x17, 0x0a0f);
104 	lb035q02_write_reg(spi, 0x1e, 0x00c1);
105 	lb035q02_write_reg(spi, 0x30, 0x0300);
106 	lb035q02_write_reg(spi, 0x31, 0x0007);
107 	lb035q02_write_reg(spi, 0x32, 0x0000);
108 	lb035q02_write_reg(spi, 0x33, 0x0000);
109 	lb035q02_write_reg(spi, 0x34, 0x0707);
110 	lb035q02_write_reg(spi, 0x35, 0x0004);
111 	lb035q02_write_reg(spi, 0x36, 0x0302);
112 	lb035q02_write_reg(spi, 0x37, 0x0202);
113 	lb035q02_write_reg(spi, 0x3a, 0x0a0d);
114 	lb035q02_write_reg(spi, 0x3b, 0x0806);
115 }
116 
lb035q02_connect(struct omap_dss_device * dssdev)117 static int lb035q02_connect(struct omap_dss_device *dssdev)
118 {
119 	struct panel_drv_data *ddata = to_panel_data(dssdev);
120 	struct omap_dss_device *in = ddata->in;
121 	int r;
122 
123 	if (omapdss_device_is_connected(dssdev))
124 		return 0;
125 
126 	r = in->ops.dpi->connect(in, dssdev);
127 	if (r)
128 		return r;
129 
130 	init_lb035q02_panel(ddata->spi);
131 
132 	return 0;
133 }
134 
lb035q02_disconnect(struct omap_dss_device * dssdev)135 static void lb035q02_disconnect(struct omap_dss_device *dssdev)
136 {
137 	struct panel_drv_data *ddata = to_panel_data(dssdev);
138 	struct omap_dss_device *in = ddata->in;
139 
140 	if (!omapdss_device_is_connected(dssdev))
141 		return;
142 
143 	in->ops.dpi->disconnect(in, dssdev);
144 }
145 
lb035q02_enable(struct omap_dss_device * dssdev)146 static int lb035q02_enable(struct omap_dss_device *dssdev)
147 {
148 	struct panel_drv_data *ddata = to_panel_data(dssdev);
149 	struct omap_dss_device *in = ddata->in;
150 	int r;
151 
152 	if (!omapdss_device_is_connected(dssdev))
153 		return -ENODEV;
154 
155 	if (omapdss_device_is_enabled(dssdev))
156 		return 0;
157 
158 	if (ddata->data_lines)
159 		in->ops.dpi->set_data_lines(in, ddata->data_lines);
160 	in->ops.dpi->set_timings(in, &ddata->videomode);
161 
162 	r = in->ops.dpi->enable(in);
163 	if (r)
164 		return r;
165 
166 	if (ddata->enable_gpio)
167 		gpiod_set_value_cansleep(ddata->enable_gpio, 1);
168 
169 	if (gpio_is_valid(ddata->backlight_gpio))
170 		gpio_set_value_cansleep(ddata->backlight_gpio, 1);
171 
172 	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
173 
174 	return 0;
175 }
176 
lb035q02_disable(struct omap_dss_device * dssdev)177 static void lb035q02_disable(struct omap_dss_device *dssdev)
178 {
179 	struct panel_drv_data *ddata = to_panel_data(dssdev);
180 	struct omap_dss_device *in = ddata->in;
181 
182 	if (!omapdss_device_is_enabled(dssdev))
183 		return;
184 
185 	if (ddata->enable_gpio)
186 		gpiod_set_value_cansleep(ddata->enable_gpio, 0);
187 
188 	if (gpio_is_valid(ddata->backlight_gpio))
189 		gpio_set_value_cansleep(ddata->backlight_gpio, 0);
190 
191 	in->ops.dpi->disable(in);
192 
193 	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
194 }
195 
lb035q02_set_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)196 static void lb035q02_set_timings(struct omap_dss_device *dssdev,
197 		struct omap_video_timings *timings)
198 {
199 	struct panel_drv_data *ddata = to_panel_data(dssdev);
200 	struct omap_dss_device *in = ddata->in;
201 
202 	ddata->videomode = *timings;
203 	dssdev->panel.timings = *timings;
204 
205 	in->ops.dpi->set_timings(in, timings);
206 }
207 
lb035q02_get_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)208 static void lb035q02_get_timings(struct omap_dss_device *dssdev,
209 		struct omap_video_timings *timings)
210 {
211 	struct panel_drv_data *ddata = to_panel_data(dssdev);
212 
213 	*timings = ddata->videomode;
214 }
215 
lb035q02_check_timings(struct omap_dss_device * dssdev,struct omap_video_timings * timings)216 static int lb035q02_check_timings(struct omap_dss_device *dssdev,
217 		struct omap_video_timings *timings)
218 {
219 	struct panel_drv_data *ddata = to_panel_data(dssdev);
220 	struct omap_dss_device *in = ddata->in;
221 
222 	return in->ops.dpi->check_timings(in, timings);
223 }
224 
225 static struct omap_dss_driver lb035q02_ops = {
226 	.connect	= lb035q02_connect,
227 	.disconnect	= lb035q02_disconnect,
228 
229 	.enable		= lb035q02_enable,
230 	.disable	= lb035q02_disable,
231 
232 	.set_timings	= lb035q02_set_timings,
233 	.get_timings	= lb035q02_get_timings,
234 	.check_timings	= lb035q02_check_timings,
235 
236 	.get_resolution	= omapdss_default_get_resolution,
237 };
238 
lb035q02_probe_of(struct spi_device * spi)239 static int lb035q02_probe_of(struct spi_device *spi)
240 {
241 	struct device_node *node = spi->dev.of_node;
242 	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
243 	struct omap_dss_device *in;
244 	struct gpio_desc *gpio;
245 
246 	gpio = devm_gpiod_get(&spi->dev, "enable", GPIOD_OUT_LOW);
247 	if (IS_ERR(gpio)) {
248 		dev_err(&spi->dev, "failed to parse enable gpio\n");
249 		return PTR_ERR(gpio);
250 	}
251 
252 	ddata->enable_gpio = gpio;
253 
254 	ddata->backlight_gpio = -ENOENT;
255 
256 	in = omapdss_of_find_source_for_first_ep(node);
257 	if (IS_ERR(in)) {
258 		dev_err(&spi->dev, "failed to find video source\n");
259 		return PTR_ERR(in);
260 	}
261 
262 	ddata->in = in;
263 
264 	return 0;
265 }
266 
lb035q02_panel_spi_probe(struct spi_device * spi)267 static int lb035q02_panel_spi_probe(struct spi_device *spi)
268 {
269 	struct panel_drv_data *ddata;
270 	struct omap_dss_device *dssdev;
271 	int r;
272 
273 	if (!spi->dev.of_node)
274 		return -ENODEV;
275 
276 	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
277 	if (ddata == NULL)
278 		return -ENOMEM;
279 
280 	dev_set_drvdata(&spi->dev, ddata);
281 
282 	ddata->spi = spi;
283 
284 	r = lb035q02_probe_of(spi);
285 	if (r)
286 		return r;
287 
288 	if (gpio_is_valid(ddata->backlight_gpio)) {
289 		r = devm_gpio_request_one(&spi->dev, ddata->backlight_gpio,
290 				GPIOF_OUT_INIT_LOW, "panel backlight");
291 		if (r)
292 			goto err_gpio;
293 	}
294 
295 	ddata->videomode = lb035q02_timings;
296 
297 	dssdev = &ddata->dssdev;
298 	dssdev->dev = &spi->dev;
299 	dssdev->driver = &lb035q02_ops;
300 	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
301 	dssdev->owner = THIS_MODULE;
302 	dssdev->panel.timings = ddata->videomode;
303 	dssdev->phy.dpi.data_lines = ddata->data_lines;
304 
305 	r = omapdss_register_display(dssdev);
306 	if (r) {
307 		dev_err(&spi->dev, "Failed to register panel\n");
308 		goto err_reg;
309 	}
310 
311 	return 0;
312 
313 err_reg:
314 err_gpio:
315 	omap_dss_put_device(ddata->in);
316 	return r;
317 }
318 
lb035q02_panel_spi_remove(struct spi_device * spi)319 static int lb035q02_panel_spi_remove(struct spi_device *spi)
320 {
321 	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
322 	struct omap_dss_device *dssdev = &ddata->dssdev;
323 	struct omap_dss_device *in = ddata->in;
324 
325 	omapdss_unregister_display(dssdev);
326 
327 	lb035q02_disable(dssdev);
328 	lb035q02_disconnect(dssdev);
329 
330 	omap_dss_put_device(in);
331 
332 	return 0;
333 }
334 
335 static const struct of_device_id lb035q02_of_match[] = {
336 	{ .compatible = "omapdss,lgphilips,lb035q02", },
337 	{},
338 };
339 
340 MODULE_DEVICE_TABLE(of, lb035q02_of_match);
341 
342 static struct spi_driver lb035q02_spi_driver = {
343 	.probe		= lb035q02_panel_spi_probe,
344 	.remove		= lb035q02_panel_spi_remove,
345 	.driver		= {
346 		.name	= "panel_lgphilips_lb035q02",
347 		.of_match_table = lb035q02_of_match,
348 		.suppress_bind_attrs = true,
349 	},
350 };
351 
352 module_spi_driver(lb035q02_spi_driver);
353 
354 MODULE_ALIAS("spi:lgphilips,lb035q02");
355 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
356 MODULE_DESCRIPTION("LG.Philips LB035Q02 LCD Panel driver");
357 MODULE_LICENSE("GPL");
358