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Haavard Skinnemoen18f65c72007-09-02 23:15:49 +01001/*
2 * Power control for Samsung LTV350QV Quarter VGA LCD Panel
3 *
4 * Copyright (C) 2006, 2007 Atmel Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#include <linux/delay.h>
11#include <linux/err.h>
12#include <linux/fb.h>
13#include <linux/init.h>
14#include <linux/lcd.h>
15#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090016#include <linux/slab.h>
Haavard Skinnemoen18f65c72007-09-02 23:15:49 +010017#include <linux/spi/spi.h>
18
19#include "ltv350qv.h"
20
21#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
22
23struct ltv350qv {
24 struct spi_device *spi;
25 u8 *buffer;
26 int power;
27 struct lcd_device *ld;
28};
29
30/*
31 * The power-on and power-off sequences are taken from the
32 * LTV350QV-F04 data sheet from Samsung. The register definitions are
33 * taken from the S6F2002 command list also from Samsung. Both
34 * documents are distributed with the AVR32 Linux BSP CD from Atmel.
35 *
36 * There's still some voodoo going on here, but it's a lot better than
37 * in the first incarnation of the driver where all we had was the raw
38 * numbers from the initialization sequence.
39 */
40static int ltv350qv_write_reg(struct ltv350qv *lcd, u8 reg, u16 val)
41{
42 struct spi_message msg;
43 struct spi_transfer index_xfer = {
44 .len = 3,
45 .cs_change = 1,
46 };
47 struct spi_transfer value_xfer = {
48 .len = 3,
49 };
50
51 spi_message_init(&msg);
52
53 /* register index */
54 lcd->buffer[0] = LTV_OPC_INDEX;
55 lcd->buffer[1] = 0x00;
56 lcd->buffer[2] = reg & 0x7f;
57 index_xfer.tx_buf = lcd->buffer;
58 spi_message_add_tail(&index_xfer, &msg);
59
60 /* register value */
61 lcd->buffer[4] = LTV_OPC_DATA;
62 lcd->buffer[5] = val >> 8;
63 lcd->buffer[6] = val;
64 value_xfer.tx_buf = lcd->buffer + 4;
65 spi_message_add_tail(&value_xfer, &msg);
66
67 return spi_sync(lcd->spi, &msg);
68}
69
70/* The comments are taken straight from the data sheet */
71static int ltv350qv_power_on(struct ltv350qv *lcd)
72{
73 int ret;
74
75 /* Power On Reset Display off State */
76 if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, 0x0000))
77 goto err;
78 msleep(15);
79
80 /* Power Setting Function 1 */
81 if (ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE))
82 goto err;
83 if (ltv350qv_write_reg(lcd, LTV_PWRCTL2, LTV_VCOML_ENABLE))
84 goto err_power1;
85
86 /* Power Setting Function 2 */
87 if (ltv350qv_write_reg(lcd, LTV_PWRCTL1,
88 LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
89 | LTV_SUPPLY_CURRENT(5)))
90 goto err_power2;
91
92 msleep(55);
93
94 /* Instruction Setting */
95 ret = ltv350qv_write_reg(lcd, LTV_IFCTL,
96 LTV_NMD | LTV_REV | LTV_NL(0x1d));
97 ret |= ltv350qv_write_reg(lcd, LTV_DATACTL,
98 LTV_DS_SAME | LTV_CHS_480
99 | LTV_DF_RGB | LTV_RGB_BGR);
100 ret |= ltv350qv_write_reg(lcd, LTV_ENTRY_MODE,
101 LTV_VSPL_ACTIVE_LOW
102 | LTV_HSPL_ACTIVE_LOW
103 | LTV_DPL_SAMPLE_RISING
104 | LTV_EPL_ACTIVE_LOW
105 | LTV_SS_RIGHT_TO_LEFT);
106 ret |= ltv350qv_write_reg(lcd, LTV_GATECTL1, LTV_CLW(3));
107 ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
108 LTV_NW_INV_1LINE | LTV_FWI(3));
109 ret |= ltv350qv_write_reg(lcd, LTV_VBP, 0x000a);
110 ret |= ltv350qv_write_reg(lcd, LTV_HBP, 0x0021);
111 ret |= ltv350qv_write_reg(lcd, LTV_SOTCTL, LTV_SDT(3) | LTV_EQ(0));
112 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(0), 0x0103);
113 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(1), 0x0301);
114 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(2), 0x1f0f);
115 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(3), 0x1f0f);
116 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(4), 0x0707);
117 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(5), 0x0307);
118 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(6), 0x0707);
119 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(7), 0x0000);
120 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(8), 0x0004);
121 ret |= ltv350qv_write_reg(lcd, LTV_GAMMA(9), 0x0000);
122 if (ret)
123 goto err_settings;
124
125 /* Wait more than 2 frames */
126 msleep(20);
127
128 /* Display On Sequence */
129 ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
130 LTV_VCOM_DISABLE | LTV_VCOMOUT_ENABLE
131 | LTV_POWER_ON | LTV_DRIVE_CURRENT(5)
132 | LTV_SUPPLY_CURRENT(5));
133 ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
134 LTV_NW_INV_1LINE | LTV_DSC | LTV_FWI(3));
135 if (ret)
136 goto err_disp_on;
137
138 /* Display should now be ON. Phew. */
139 return 0;
140
141err_disp_on:
142 /*
143 * Try to recover. Error handling probably isn't very useful
144 * at this point, just make a best effort to switch the panel
145 * off.
146 */
147 ltv350qv_write_reg(lcd, LTV_PWRCTL1,
148 LTV_VCOM_DISABLE | LTV_DRIVE_CURRENT(5)
149 | LTV_SUPPLY_CURRENT(5));
150 ltv350qv_write_reg(lcd, LTV_GATECTL2,
151 LTV_NW_INV_1LINE | LTV_FWI(3));
152err_settings:
153err_power2:
154err_power1:
155 ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
156 msleep(1);
157err:
158 ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
159 return -EIO;
160}
161
162static int ltv350qv_power_off(struct ltv350qv *lcd)
163{
164 int ret;
165
166 /* Display Off Sequence */
167 ret = ltv350qv_write_reg(lcd, LTV_PWRCTL1,
168 LTV_VCOM_DISABLE
169 | LTV_DRIVE_CURRENT(5)
170 | LTV_SUPPLY_CURRENT(5));
171 ret |= ltv350qv_write_reg(lcd, LTV_GATECTL2,
172 LTV_NW_INV_1LINE | LTV_FWI(3));
173
174 /* Power down setting 1 */
175 ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL2, 0x0000);
176
177 /* Wait at least 1 ms */
178 msleep(1);
179
180 /* Power down setting 2 */
181 ret |= ltv350qv_write_reg(lcd, LTV_PWRCTL1, LTV_VCOM_DISABLE);
182
183 /*
184 * No point in trying to recover here. If we can't switch the
185 * panel off, what are we supposed to do other than inform the
186 * user about the failure?
187 */
188 if (ret)
189 return -EIO;
190
191 /* Display power should now be OFF */
192 return 0;
193}
194
195static int ltv350qv_power(struct ltv350qv *lcd, int power)
196{
197 int ret = 0;
198
199 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
200 ret = ltv350qv_power_on(lcd);
201 else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
202 ret = ltv350qv_power_off(lcd);
203
204 if (!ret)
205 lcd->power = power;
206
207 return ret;
208}
209
210static int ltv350qv_set_power(struct lcd_device *ld, int power)
211{
212 struct ltv350qv *lcd = lcd_get_data(ld);
213
214 return ltv350qv_power(lcd, power);
215}
216
217static int ltv350qv_get_power(struct lcd_device *ld)
218{
219 struct ltv350qv *lcd = lcd_get_data(ld);
220
221 return lcd->power;
222}
223
224static struct lcd_ops ltv_ops = {
225 .get_power = ltv350qv_get_power,
226 .set_power = ltv350qv_set_power,
227};
228
229static int __devinit ltv350qv_probe(struct spi_device *spi)
230{
231 struct ltv350qv *lcd;
232 struct lcd_device *ld;
233 int ret;
234
235 lcd = kzalloc(sizeof(struct ltv350qv), GFP_KERNEL);
236 if (!lcd)
237 return -ENOMEM;
238
239 lcd->spi = spi;
240 lcd->power = FB_BLANK_POWERDOWN;
241 lcd->buffer = kzalloc(8, GFP_KERNEL);
242
243 ld = lcd_device_register("ltv350qv", &spi->dev, lcd, &ltv_ops);
244 if (IS_ERR(ld)) {
245 ret = PTR_ERR(ld);
246 goto out_free_lcd;
247 }
248 lcd->ld = ld;
249
250 ret = ltv350qv_power(lcd, FB_BLANK_UNBLANK);
251 if (ret)
252 goto out_unregister;
253
254 dev_set_drvdata(&spi->dev, lcd);
255
256 return 0;
257
258out_unregister:
259 lcd_device_unregister(ld);
260out_free_lcd:
261 kfree(lcd);
262 return ret;
263}
264
265static int __devexit ltv350qv_remove(struct spi_device *spi)
266{
267 struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
268
269 ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
270 lcd_device_unregister(lcd->ld);
271 kfree(lcd);
272
273 return 0;
274}
275
276#ifdef CONFIG_PM
277static int ltv350qv_suspend(struct spi_device *spi, pm_message_t state)
278{
279 struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
280
281 return ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
282}
283
284static int ltv350qv_resume(struct spi_device *spi)
285{
286 struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
287
288 return ltv350qv_power(lcd, FB_BLANK_UNBLANK);
289}
290#else
291#define ltv350qv_suspend NULL
292#define ltv350qv_resume NULL
293#endif
294
295/* Power down all displays on reboot, poweroff or halt */
296static void ltv350qv_shutdown(struct spi_device *spi)
297{
298 struct ltv350qv *lcd = dev_get_drvdata(&spi->dev);
299
300 ltv350qv_power(lcd, FB_BLANK_POWERDOWN);
301}
302
303static struct spi_driver ltv350qv_driver = {
304 .driver = {
305 .name = "ltv350qv",
306 .bus = &spi_bus_type,
307 .owner = THIS_MODULE,
308 },
309
310 .probe = ltv350qv_probe,
311 .remove = __devexit_p(ltv350qv_remove),
312 .shutdown = ltv350qv_shutdown,
313 .suspend = ltv350qv_suspend,
314 .resume = ltv350qv_resume,
315};
316
317static int __init ltv350qv_init(void)
318{
319 return spi_register_driver(&ltv350qv_driver);
320}
321
322static void __exit ltv350qv_exit(void)
323{
324 spi_unregister_driver(&ltv350qv_driver);
325}
326module_init(ltv350qv_init);
327module_exit(ltv350qv_exit);
328
329MODULE_AUTHOR("Haavard Skinnemoen <hskinnemoen@atmel.com>");
330MODULE_DESCRIPTION("Samsung LTV350QV LCD Driver");
331MODULE_LICENSE("GPL");
Anton Vorontsove0626e32009-09-22 16:46:08 -0700332MODULE_ALIAS("spi:ltv350qv");