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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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