1/*
  2 * NEC NL8048HL11 Panel driver
  3 *
  4 * Copyright (C) 2010 Texas Instruments Inc.
  5 * Author: Erik Gilling <konkers@android.com>
  6 * Converted to new DSS device model: Tomi Valkeinen <tomi.valkeinen@ti.com>
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License as published by
 10 * the Free Software Foundation; either version 2 of the License, or
 11 * (at your option) any later version.
 12 */
 13
 14#include <linux/module.h>
 15#include <linux/delay.h>
 16#include <linux/spi/spi.h>
 17#include <linux/fb.h>
 18#include <linux/gpio.h>
 19#include <linux/of_gpio.h>
 20
 21#include <video/omapdss.h>
 22
 23struct panel_drv_data {
 24	struct omap_dss_device	dssdev;
 25	struct omap_dss_device *in;
 26
 27	struct omap_video_timings videomode;
 28
 29	int data_lines;
 30
 31	int res_gpio;
 32	int qvga_gpio;
 33
 34	struct spi_device *spi;
 35};
 36
 37#define LCD_XRES		800
 38#define LCD_YRES		480
 39/*
 40 * NEC PIX Clock Ratings
 41 * MIN:21.8MHz TYP:23.8MHz MAX:25.7MHz
 42 */
 43#define LCD_PIXEL_CLOCK		23800000
 44
 45static const struct {
 46	unsigned char addr;
 47	unsigned char dat;
 48} nec_8048_init_seq[] = {
 49	{ 3, 0x01 }, { 0, 0x00 }, { 1, 0x01 }, { 4, 0x00 }, { 5, 0x14 },
 50	{ 6, 0x24 }, { 16, 0xD7 }, { 17, 0x00 }, { 18, 0x00 }, { 19, 0x55 },
 51	{ 20, 0x01 }, { 21, 0x70 }, { 22, 0x1E }, { 23, 0x25 },	{ 24, 0x25 },
 52	{ 25, 0x02 }, { 26, 0x02 }, { 27, 0xA0 }, { 32, 0x2F }, { 33, 0x0F },
 53	{ 34, 0x0F }, { 35, 0x0F }, { 36, 0x0F }, { 37, 0x0F },	{ 38, 0x0F },
 54	{ 39, 0x00 }, { 40, 0x02 }, { 41, 0x02 }, { 42, 0x02 },	{ 43, 0x0F },
 55	{ 44, 0x0F }, { 45, 0x0F }, { 46, 0x0F }, { 47, 0x0F },	{ 48, 0x0F },
 56	{ 49, 0x0F }, { 50, 0x00 }, { 51, 0x02 }, { 52, 0x02 }, { 53, 0x02 },
 57	{ 80, 0x0C }, { 83, 0x42 }, { 84, 0x42 }, { 85, 0x41 },	{ 86, 0x14 },
 58	{ 89, 0x88 }, { 90, 0x01 }, { 91, 0x00 }, { 92, 0x02 },	{ 93, 0x0C },
 59	{ 94, 0x1C }, { 95, 0x27 }, { 98, 0x49 }, { 99, 0x27 }, { 102, 0x76 },
 60	{ 103, 0x27 }, { 112, 0x01 }, { 113, 0x0E }, { 114, 0x02 },
 61	{ 115, 0x0C }, { 118, 0x0C }, { 121, 0x30 }, { 130, 0x00 },
 62	{ 131, 0x00 }, { 132, 0xFC }, { 134, 0x00 }, { 136, 0x00 },
 63	{ 138, 0x00 }, { 139, 0x00 }, { 140, 0x00 }, { 141, 0xFC },
 64	{ 143, 0x00 }, { 145, 0x00 }, { 147, 0x00 }, { 148, 0x00 },
 65	{ 149, 0x00 }, { 150, 0xFC }, { 152, 0x00 }, { 154, 0x00 },
 66	{ 156, 0x00 }, { 157, 0x00 }, { 2, 0x00 },
 67};
 68
 69static const struct omap_video_timings nec_8048_panel_timings = {
 70	.x_res		= LCD_XRES,
 71	.y_res		= LCD_YRES,
 72	.pixelclock	= LCD_PIXEL_CLOCK,
 73	.hfp		= 6,
 74	.hsw		= 1,
 75	.hbp		= 4,
 76	.vfp		= 3,
 77	.vsw		= 1,
 78	.vbp		= 4,
 79
 80	.vsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 81	.hsync_level	= OMAPDSS_SIG_ACTIVE_LOW,
 82	.data_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
 83	.de_level	= OMAPDSS_SIG_ACTIVE_HIGH,
 84	.sync_pclk_edge	= OMAPDSS_DRIVE_SIG_RISING_EDGE,
 85};
 86
 87#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
 88
 89static int nec_8048_spi_send(struct spi_device *spi, unsigned char reg_addr,
 90			unsigned char reg_data)
 91{
 92	int ret = 0;
 93	unsigned int cmd = 0, data = 0;
 94
 95	cmd = 0x0000 | reg_addr; /* register address write */
 96	data = 0x0100 | reg_data; /* register data write */
 97	data = (cmd << 16) | data;
 98
 99	ret = spi_write(spi, (unsigned char *)&data, 4);
100	if (ret)
101		pr_err("error in spi_write %x\n", data);
102
103	return ret;
104}
105
106static int init_nec_8048_wvga_lcd(struct spi_device *spi)
107{
108	unsigned int i;
109	/* Initialization Sequence */
110	/* nec_8048_spi_send(spi, REG, VAL) */
111	for (i = 0; i < (ARRAY_SIZE(nec_8048_init_seq) - 1); i++)
112		nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
113				nec_8048_init_seq[i].dat);
114	udelay(20);
115	nec_8048_spi_send(spi, nec_8048_init_seq[i].addr,
116				nec_8048_init_seq[i].dat);
117	return 0;
118}
119
120static int nec_8048_connect(struct omap_dss_device *dssdev)
121{
122	struct panel_drv_data *ddata = to_panel_data(dssdev);
123	struct omap_dss_device *in = ddata->in;
124	int r;
125
126	if (omapdss_device_is_connected(dssdev))
127		return 0;
128
129	r = in->ops.dpi->connect(in, dssdev);
130	if (r)
131		return r;
132
133	return 0;
134}
135
136static void nec_8048_disconnect(struct omap_dss_device *dssdev)
137{
138	struct panel_drv_data *ddata = to_panel_data(dssdev);
139	struct omap_dss_device *in = ddata->in;
140
141	if (!omapdss_device_is_connected(dssdev))
142		return;
143
144	in->ops.dpi->disconnect(in, dssdev);
145}
146
147static int nec_8048_enable(struct omap_dss_device *dssdev)
148{
149	struct panel_drv_data *ddata = to_panel_data(dssdev);
150	struct omap_dss_device *in = ddata->in;
151	int r;
152
153	if (!omapdss_device_is_connected(dssdev))
154		return -ENODEV;
155
156	if (omapdss_device_is_enabled(dssdev))
157		return 0;
158
159	if (ddata->data_lines)
160		in->ops.dpi->set_data_lines(in, ddata->data_lines);
161	in->ops.dpi->set_timings(in, &ddata->videomode);
162
163	r = in->ops.dpi->enable(in);
164	if (r)
165		return r;
166
167	if (gpio_is_valid(ddata->res_gpio))
168		gpio_set_value_cansleep(ddata->res_gpio, 1);
169
170	dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
171
172	return 0;
173}
174
175static void nec_8048_disable(struct omap_dss_device *dssdev)
176{
177	struct panel_drv_data *ddata = to_panel_data(dssdev);
178	struct omap_dss_device *in = ddata->in;
179
180	if (!omapdss_device_is_enabled(dssdev))
181		return;
182
183	if (gpio_is_valid(ddata->res_gpio))
184		gpio_set_value_cansleep(ddata->res_gpio, 0);
185
186	in->ops.dpi->disable(in);
187
188	dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
189}
190
191static void nec_8048_set_timings(struct omap_dss_device *dssdev,
192		struct omap_video_timings *timings)
193{
194	struct panel_drv_data *ddata = to_panel_data(dssdev);
195	struct omap_dss_device *in = ddata->in;
196
197	ddata->videomode = *timings;
198	dssdev->panel.timings = *timings;
199
200	in->ops.dpi->set_timings(in, timings);
201}
202
203static void nec_8048_get_timings(struct omap_dss_device *dssdev,
204		struct omap_video_timings *timings)
205{
206	struct panel_drv_data *ddata = to_panel_data(dssdev);
207
208	*timings = ddata->videomode;
209}
210
211static int nec_8048_check_timings(struct omap_dss_device *dssdev,
212		struct omap_video_timings *timings)
213{
214	struct panel_drv_data *ddata = to_panel_data(dssdev);
215	struct omap_dss_device *in = ddata->in;
216
217	return in->ops.dpi->check_timings(in, timings);
218}
219
220static struct omap_dss_driver nec_8048_ops = {
221	.connect	= nec_8048_connect,
222	.disconnect	= nec_8048_disconnect,
223
224	.enable		= nec_8048_enable,
225	.disable	= nec_8048_disable,
226
227	.set_timings	= nec_8048_set_timings,
228	.get_timings	= nec_8048_get_timings,
229	.check_timings	= nec_8048_check_timings,
230
231	.get_resolution	= omapdss_default_get_resolution,
232};
233
234static int nec_8048_probe_of(struct spi_device *spi)
235{
236	struct device_node *node = spi->dev.of_node;
237	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
238	struct omap_dss_device *in;
239	int gpio;
240
241	gpio = of_get_named_gpio(node, "reset-gpios", 0);
242	if (!gpio_is_valid(gpio)) {
243		dev_err(&spi->dev, "failed to parse enable gpio\n");
244		return gpio;
245	}
246	ddata->res_gpio = gpio;
247
248	/* XXX the panel spec doesn't mention any QVGA pin?? */
249	ddata->qvga_gpio = -ENOENT;
250
251	in = omapdss_of_find_source_for_first_ep(node);
252	if (IS_ERR(in)) {
253		dev_err(&spi->dev, "failed to find video source\n");
254		return PTR_ERR(in);
255	}
256
257	ddata->in = in;
258
259	return 0;
260}
261
262static int nec_8048_probe(struct spi_device *spi)
263{
264	struct panel_drv_data *ddata;
265	struct omap_dss_device *dssdev;
266	int r;
267
268	dev_dbg(&spi->dev, "%s\n", __func__);
269
270	spi->mode = SPI_MODE_0;
271	spi->bits_per_word = 32;
272
273	r = spi_setup(spi);
274	if (r < 0) {
275		dev_err(&spi->dev, "spi_setup failed: %d\n", r);
276		return r;
277	}
278
279	init_nec_8048_wvga_lcd(spi);
280
281	ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
282	if (ddata == NULL)
283		return -ENOMEM;
284
285	dev_set_drvdata(&spi->dev, ddata);
286
287	ddata->spi = spi;
288
289	if (!spi->dev.of_node)
290		return -ENODEV;
291
292	r = nec_8048_probe_of(spi);
293	if (r)
294		return r;
295
296	if (gpio_is_valid(ddata->qvga_gpio)) {
297		r = devm_gpio_request_one(&spi->dev, ddata->qvga_gpio,
298				GPIOF_OUT_INIT_HIGH, "lcd QVGA");
299		if (r)
300			goto err_gpio;
301	}
302
303	if (gpio_is_valid(ddata->res_gpio)) {
304		r = devm_gpio_request_one(&spi->dev, ddata->res_gpio,
305				GPIOF_OUT_INIT_LOW, "lcd RES");
306		if (r)
307			goto err_gpio;
308	}
309
310	ddata->videomode = nec_8048_panel_timings;
311
312	dssdev = &ddata->dssdev;
313	dssdev->dev = &spi->dev;
314	dssdev->driver = &nec_8048_ops;
315	dssdev->type = OMAP_DISPLAY_TYPE_DPI;
316	dssdev->owner = THIS_MODULE;
317	dssdev->panel.timings = ddata->videomode;
318
319	r = omapdss_register_display(dssdev);
320	if (r) {
321		dev_err(&spi->dev, "Failed to register panel\n");
322		goto err_reg;
323	}
324
325	return 0;
326
327err_reg:
328err_gpio:
329	omap_dss_put_device(ddata->in);
330	return r;
331}
332
333static int nec_8048_remove(struct spi_device *spi)
334{
335	struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
336	struct omap_dss_device *dssdev = &ddata->dssdev;
337	struct omap_dss_device *in = ddata->in;
338
339	dev_dbg(&ddata->spi->dev, "%s\n", __func__);
340
341	omapdss_unregister_display(dssdev);
342
343	nec_8048_disable(dssdev);
344	nec_8048_disconnect(dssdev);
345
346	omap_dss_put_device(in);
347
348	return 0;
349}
350
351#ifdef CONFIG_PM_SLEEP
352static int nec_8048_suspend(struct device *dev)
353{
354	struct spi_device *spi = to_spi_device(dev);
355
356	nec_8048_spi_send(spi, 2, 0x01);
357	mdelay(40);
358
359	return 0;
360}
361
362static int nec_8048_resume(struct device *dev)
363{
364	struct spi_device *spi = to_spi_device(dev);
365
366	/* reinitialize the panel */
367	spi_setup(spi);
368	nec_8048_spi_send(spi, 2, 0x00);
369	init_nec_8048_wvga_lcd(spi);
370
371	return 0;
372}
373static SIMPLE_DEV_PM_OPS(nec_8048_pm_ops, nec_8048_suspend,
374		nec_8048_resume);
375#define NEC_8048_PM_OPS (&nec_8048_pm_ops)
376#else
377#define NEC_8048_PM_OPS NULL
378#endif
379
380static const struct of_device_id nec_8048_of_match[] = {
381	{ .compatible = "omapdss,nec,nl8048hl11", },
382	{},
383};
384
385MODULE_DEVICE_TABLE(of, nec_8048_of_match);
386
387static struct spi_driver nec_8048_driver = {
388	.driver = {
389		.name	= "panel-nec-nl8048hl11",
390		.pm	= NEC_8048_PM_OPS,
391		.of_match_table = nec_8048_of_match,
392		.suppress_bind_attrs = true,
393	},
394	.probe	= nec_8048_probe,
395	.remove	= nec_8048_remove,
396};
397
398module_spi_driver(nec_8048_driver);
399
400MODULE_ALIAS("spi:nec,nl8048hl11");
401MODULE_AUTHOR("Erik Gilling <konkers@android.com>");
402MODULE_DESCRIPTION("NEC-NL8048HL11 Driver");
403MODULE_LICENSE("GPL");