1/*
  2 * LCD panel driver for Sharp LS037V7DW01
  3 *
  4 * Copyright (C) 2013 Texas Instruments
  5 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
  6 *
  7 * This program is free software; you can redistribute it and/or modify it
  8 * under the terms of the GNU General Public License version 2 as published by
  9 * the Free Software Foundation.
 10 */
 11
 12#include <linux/delay.h>
 13#include <linux/gpio.h>
 14#include <linux/module.h>
 15#include <linux/of.h>
 16#include <linux/of_gpio.h>
 17#include <linux/platform_device.h>
 18#include <linux/slab.h>
 19#include <linux/regulator/consumer.h>
 20#include <video/omapdss.h>
 21
 22struct panel_drv_data {
 23	struct omap_dss_device dssdev;
 24	struct omap_dss_device *in;
 25	struct regulator *vcc;
 26
 27	int data_lines;
 28
 29	struct omap_video_timings videomode;
 30
 31	struct gpio_desc *resb_gpio;	/* low = reset active min 20 us */
 32	struct gpio_desc *ini_gpio;	/* high = power on */
 33	struct gpio_desc *mo_gpio;	/* low = 480x640, high = 240x320 */
 34	struct gpio_desc *lr_gpio;	/* high = conventional horizontal scanning */
 35	struct gpio_desc *ud_gpio;	/* high = conventional vertical scanning */
 36};
 37
 38static const struct omap_video_timings sharp_ls_timings = {
 39	.x_res = 480,
 40	.y_res = 640,
 41
 42	.pixelclock	= 19200000,
 43
 44	.hsw		= 2,
 45	.hfp		= 1,
 46	.hbp		= 28,
 47
 48	.vsw		= 1,
 49	.vfp		= 1,
 50	.vbp		= 1,
 51
 52	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 53	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 54	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
 55	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
 56	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_FALLING_EDGE,
 57};
 58
 59#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
 60
 61static int sharp_ls_connect(struct omap_dss_device *dssdev)
 62{
 63	struct panel_drv_data *ddata = to_panel_data(dssdev);
 64	struct omap_dss_device *in = ddata->in;
 65	int r;
 66
 67	if (omapdss_device_is_connected(dssdev))
 68		return 0;
 69
 70	r = in->ops.dpi->connect(in, dssdev);
 71	if (r)
 72		return r;
 73
 74	return 0;
 75}
 76
 77static void sharp_ls_disconnect(struct omap_dss_device *dssdev)
 78{
 79	struct panel_drv_data *ddata = to_panel_data(dssdev);
 80	struct omap_dss_device *in = ddata->in;
 81
 82	if (!omapdss_device_is_connected(dssdev))
 83		return;
 84
 85	in->ops.dpi->disconnect(in, dssdev);
 86}
 87
 88static int sharp_ls_enable(struct omap_dss_device *dssdev)
 89{
 90	struct panel_drv_data *ddata = to_panel_data(dssdev);
 91	struct omap_dss_device *in = ddata->in;
 92	int r;
 93
 94	if (!omapdss_device_is_connected(dssdev))
 95		return -ENODEV;
 96
 97	if (omapdss_device_is_enabled(dssdev))
 98		return 0;
 99
100	if (ddata->data_lines)
101		in->ops.dpi->set_data_lines(in, ddata->data_lines);
102	in->ops.dpi->set_timings(in, &ddata->videomode);
103
104	if (ddata->vcc) {
105		r = regulator_enable(ddata->vcc);
106		if (r != 0)
107			return r;
108	}
109
110	r = in->ops.dpi->enable(in);
111	if (r) {
112		regulator_disable(ddata->vcc);
113		return r;
114	}
115
116	/* wait couple of vsyncs until enabling the LCD */
117	msleep(50);
118
119	if (ddata->resb_gpio)
120		gpiod_set_value_cansleep(ddata->resb_gpio, 1);
121
122	if (ddata->ini_gpio)
123		gpiod_set_value_cansleep(ddata->ini_gpio, 1);
124
125	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
126
127	return 0;
128}
129
130static void sharp_ls_disable(struct omap_dss_device *dssdev)
131{
132	struct panel_drv_data *ddata = to_panel_data(dssdev);
133	struct omap_dss_device *in = ddata->in;
134
135	if (!omapdss_device_is_enabled(dssdev))
136		return;
137
138	if (ddata->ini_gpio)
139		gpiod_set_value_cansleep(ddata->ini_gpio, 0);
140
141	if (ddata->resb_gpio)
142		gpiod_set_value_cansleep(ddata->resb_gpio, 0);
143
144	/* wait at least 5 vsyncs after disabling the LCD */
145
146	msleep(100);
147
148	in->ops.dpi->disable(in);
149
150	if (ddata->vcc)
151		regulator_disable(ddata->vcc);
152
153	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
154}
155
156static void sharp_ls_set_timings(struct omap_dss_device *dssdev,
157		struct omap_video_timings *timings)
158{
159	struct panel_drv_data *ddata = to_panel_data(dssdev);
160	struct omap_dss_device *in = ddata->in;
161
162	ddata->videomode = *timings;
163	dssdev->panel.timings = *timings;
164
165	in->ops.dpi->set_timings(in, timings);
166}
167
168static void sharp_ls_get_timings(struct omap_dss_device *dssdev,
169		struct omap_video_timings *timings)
170{
171	struct panel_drv_data *ddata = to_panel_data(dssdev);
172
173	*timings = ddata->videomode;
174}
175
176static int sharp_ls_check_timings(struct omap_dss_device *dssdev,
177		struct omap_video_timings *timings)
178{
179	struct panel_drv_data *ddata = to_panel_data(dssdev);
180	struct omap_dss_device *in = ddata->in;
181
182	return in->ops.dpi->check_timings(in, timings);
183}
184
185static struct omap_dss_driver sharp_ls_ops = {
186	.connect	= sharp_ls_connect,
187	.disconnect	= sharp_ls_disconnect,
188
189	.enable		= sharp_ls_enable,
190	.disable	= sharp_ls_disable,
191
192	.set_timings	= sharp_ls_set_timings,
193	.get_timings	= sharp_ls_get_timings,
194	.check_timings	= sharp_ls_check_timings,
195
196	.get_resolution	= omapdss_default_get_resolution,
197};
198
199static  int sharp_ls_get_gpio_of(struct device *dev, int index, int val,
200	const char *desc, struct gpio_desc **gpiod)
201{
202	struct gpio_desc *gd;
203
204	*gpiod = NULL;
205
206	gd = devm_gpiod_get_index(dev, desc, index, GPIOD_OUT_LOW);
207	if (IS_ERR(gd))
208		return PTR_ERR(gd);
209
210	*gpiod = gd;
211	return 0;
212}
213
214static int sharp_ls_probe_of(struct platform_device *pdev)
215{
216	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
217	struct device_node *node = pdev->dev.of_node;
218	struct omap_dss_device *in;
219	int r;
220
221	ddata->vcc = devm_regulator_get(&pdev->dev, "envdd");
222	if (IS_ERR(ddata->vcc)) {
223		dev_err(&pdev->dev, "failed to get regulator\n");
224		return PTR_ERR(ddata->vcc);
225	}
226
227	/* lcd INI */
228	r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "enable", &ddata->ini_gpio);
229	if (r)
230		return r;
231
232	/* lcd RESB */
233	r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "reset", &ddata->resb_gpio);
234	if (r)
235		return r;
236
237	/* lcd MO */
238	r = sharp_ls_get_gpio_of(&pdev->dev, 0, 0, "mode", &ddata->mo_gpio);
239	if (r)
240		return r;
241
242	/* lcd LR */
243	r = sharp_ls_get_gpio_of(&pdev->dev, 1, 1, "mode", &ddata->lr_gpio);
244	if (r)
245		return r;
246
247	/* lcd UD */
248	r = sharp_ls_get_gpio_of(&pdev->dev, 2, 1, "mode", &ddata->ud_gpio);
249	if (r)
250		return r;
251
252	in = omapdss_of_find_source_for_first_ep(node);
253	if (IS_ERR(in)) {
254		dev_err(&pdev->dev, "failed to find video source\n");
255		return PTR_ERR(in);
256	}
257
258	ddata->in = in;
259
260	return 0;
261}
262
263static int sharp_ls_probe(struct platform_device *pdev)
264{
265	struct panel_drv_data *ddata;
266	struct omap_dss_device *dssdev;
267	int r;
268
269	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
270	if (ddata == NULL)
271		return -ENOMEM;
272
273	platform_set_drvdata(pdev, ddata);
274
275	if (!pdev->dev.of_node)
276		return -ENODEV;
277
278	r = sharp_ls_probe_of(pdev);
279	if (r)
280		return r;
281
282	ddata->videomode = sharp_ls_timings;
283
284	dssdev = &ddata->dssdev;
285	dssdev->dev = &pdev->dev;
286	dssdev->driver = &sharp_ls_ops;
287	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
288	dssdev->owner = THIS_MODULE;
289	dssdev->panel.timings = ddata->videomode;
290	dssdev->phy.dpi.data_lines = ddata->data_lines;
291
292	r = omapdss_register_display(dssdev);
293	if (r) {
294		dev_err(&pdev->dev, "Failed to register panel\n");
295		goto err_reg;
296	}
297
298	return 0;
299
300err_reg:
301	omap_dss_put_device(ddata->in);
302	return r;
303}
304
305static int __exit sharp_ls_remove(struct platform_device *pdev)
306{
307	struct panel_drv_data *ddata = platform_get_drvdata(pdev);
308	struct omap_dss_device *dssdev = &ddata->dssdev;
309	struct omap_dss_device *in = ddata->in;
310
311	omapdss_unregister_display(dssdev);
312
313	sharp_ls_disable(dssdev);
314	sharp_ls_disconnect(dssdev);
315
316	omap_dss_put_device(in);
317
318	return 0;
319}
320
321static const struct of_device_id sharp_ls_of_match[] = {
322	{ .compatible = "omapdss,sharp,ls037v7dw01", },
323	{},
324};
325
326MODULE_DEVICE_TABLE(of, sharp_ls_of_match);
327
328static struct platform_driver sharp_ls_driver = {
329	.probe = sharp_ls_probe,
330	.remove = __exit_p(sharp_ls_remove),
331	.driver = {
332		.name = "panel-sharp-ls037v7dw01",
333		.of_match_table = sharp_ls_of_match,
334		.suppress_bind_attrs = true,
335	},
336};
337
338module_platform_driver(sharp_ls_driver);
339
340MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>");
341MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
342MODULE_LICENSE("GPL");