Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
[pandora-kernel.git] / drivers / video / omap2 / displays / panel-tpo-td043mtea1.c
1 /*
2  * LCD panel driver for TPO TD043MTEA1
3  *
4  * Author: Gražvydas Ignotas <notasas@gmail.com>
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 as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  */
11
12 #include <linux/module.h>
13 #include <linux/delay.h>
14 #include <linux/spi/spi.h>
15 #include <linux/regulator/consumer.h>
16 #include <linux/gpio.h>
17 #include <linux/err.h>
18 #include <linux/slab.h>
19
20 #include <plat/display.h>
21
22 #define TPO_R02_MODE(x)         ((x) & 7)
23 #define TPO_R02_MODE_800x480    7
24 #define TPO_R02_NCLK_RISING     BIT(3)
25 #define TPO_R02_HSYNC_HIGH      BIT(4)
26 #define TPO_R02_VSYNC_HIGH      BIT(5)
27
28 #define TPO_R03_NSTANDBY        BIT(0)
29 #define TPO_R03_EN_CP_CLK       BIT(1)
30 #define TPO_R03_EN_VGL_PUMP     BIT(2)
31 #define TPO_R03_EN_PWM          BIT(3)
32 #define TPO_R03_DRIVING_CAP_100 BIT(4)
33 #define TPO_R03_EN_PRE_CHARGE   BIT(6)
34 #define TPO_R03_SOFTWARE_CTL    BIT(7)
35
36 #define TPO_R04_NFLIP_H         BIT(0)
37 #define TPO_R04_NFLIP_V         BIT(1)
38 #define TPO_R04_CP_CLK_FREQ_1H  BIT(2)
39 #define TPO_R04_VGL_FREQ_1H     BIT(4)
40
41 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
42                         TPO_R03_EN_VGL_PUMP |  TPO_R03_EN_PWM | \
43                         TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
44                         TPO_R03_SOFTWARE_CTL)
45
46 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
47                         TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
48
49 static const u16 tpo_td043_def_gamma[12] = {
50         106, 200, 289, 375, 460, 543, 625, 705, 785, 864, 942, 1020
51 };
52
53 struct tpo_td043_device {
54         struct spi_device *spi;
55         struct regulator *vcc_reg;
56         u16 gamma[12];
57         u32 mode;
58         u32 hmirror:1;
59         u32 vmirror:1;
60 };
61
62 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
63 {
64         struct spi_message      m;
65         struct spi_transfer     xfer;
66         u16                     w;
67         int                     r;
68
69         spi_message_init(&m);
70
71         memset(&xfer, 0, sizeof(xfer));
72
73         w = ((u16)addr << 10) | (1 << 8) | data;
74         xfer.tx_buf = &w;
75         xfer.bits_per_word = 16;
76         xfer.len = 2;
77         spi_message_add_tail(&xfer, &m);
78
79         r = spi_sync(spi, &m);
80         if (r < 0)
81                 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
82         return r;
83 }
84
85 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
86 {
87         u8 i, val;
88
89         /* gamma bits [9:8] */
90         for (val = i = 0; i < 4; i++)
91                 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
92         tpo_td043_write(spi, 0x11, val);
93
94         for (val = i = 0; i < 4; i++)
95                 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
96         tpo_td043_write(spi, 0x12, val);
97
98         for (val = i = 0; i < 4; i++)
99                 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
100         tpo_td043_write(spi, 0x13, val);
101
102         /* gamma bits [7:0] */
103         for (val = i = 0; i < 12; i++)
104                 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
105 }
106
107 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
108 {
109         u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
110                 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
111         if (h)
112                 reg4 &= ~TPO_R04_NFLIP_H;
113         if (v)
114                 reg4 &= ~TPO_R04_NFLIP_V;
115
116         return tpo_td043_write(spi, 4, reg4);
117 }
118
119 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
120 {
121         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
122
123         tpo_td043->hmirror = enable;
124         return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
125                         tpo_td043->vmirror);
126 }
127
128 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
129 {
130         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
131
132         return tpo_td043->hmirror;
133 }
134
135 static ssize_t tpo_td043_vmirror_show(struct device *dev,
136         struct device_attribute *attr, char *buf)
137 {
138         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
139
140         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
141 }
142
143 static ssize_t tpo_td043_vmirror_store(struct device *dev,
144         struct device_attribute *attr, const char *buf, size_t count)
145 {
146         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
147         long val;
148         int ret;
149
150         ret = strict_strtol(buf, 0, &val);
151         if (ret < 0)
152                 return ret;
153
154         ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
155         if (ret < 0)
156                 return ret;
157
158         tpo_td043->vmirror = val;
159
160         return count;
161 }
162
163 static ssize_t tpo_td043_mode_show(struct device *dev,
164         struct device_attribute *attr, char *buf)
165 {
166         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
167
168         return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
169 }
170
171 static ssize_t tpo_td043_mode_store(struct device *dev,
172         struct device_attribute *attr, const char *buf, size_t count)
173 {
174         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
175         long val;
176         int ret;
177
178         ret = strict_strtol(buf, 0, &val);
179         if (ret != 0 || val & ~7)
180                 return -EINVAL;
181
182         tpo_td043->mode = val;
183
184         val |= TPO_R02_NCLK_RISING;
185         tpo_td043_write(tpo_td043->spi, 2, val);
186
187         return count;
188 }
189
190 static ssize_t tpo_td043_gamma_show(struct device *dev,
191         struct device_attribute *attr, char *buf)
192 {
193         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
194         ssize_t len = 0;
195         int ret;
196         int i;
197
198         for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
199                 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
200                                 tpo_td043->gamma[i]);
201                 if (ret < 0)
202                         return ret;
203                 len += ret;
204         }
205         buf[len - 1] = '\n';
206
207         return len;
208 }
209
210 static ssize_t tpo_td043_gamma_store(struct device *dev,
211         struct device_attribute *attr, const char *buf, size_t count)
212 {
213         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
214         unsigned int g[12];
215         int ret;
216         int i;
217
218         ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
219                         &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
220                         &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
221
222         if (ret != 12)
223                 return -EINVAL;
224
225         for (i = 0; i < 12; i++)
226                 tpo_td043->gamma[i] = g[i];
227
228         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
229
230         return count;
231 }
232
233 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
234                 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
235 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
236                 tpo_td043_mode_show, tpo_td043_mode_store);
237 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
238                 tpo_td043_gamma_show, tpo_td043_gamma_store);
239
240 static struct attribute *tpo_td043_attrs[] = {
241         &dev_attr_vmirror.attr,
242         &dev_attr_mode.attr,
243         &dev_attr_gamma.attr,
244         NULL,
245 };
246
247 static struct attribute_group tpo_td043_attr_group = {
248         .attrs = tpo_td043_attrs,
249 };
250
251 static const struct omap_video_timings tpo_td043_timings = {
252         .x_res          = 800,
253         .y_res          = 480,
254
255         .pixel_clock    = 36000,
256
257         .hsw            = 1,
258         .hfp            = 68,
259         .hbp            = 214,
260
261         .vsw            = 1,
262         .vfp            = 39,
263         .vbp            = 34,
264 };
265
266 static int tpo_td043_power_on(struct omap_dss_device *dssdev)
267 {
268         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
269         int nreset_gpio = dssdev->reset_gpio;
270         int r;
271
272         if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
273                 return 0;
274
275         r = omapdss_dpi_display_enable(dssdev);
276         if (r)
277                 goto err0;
278
279         if (dssdev->platform_enable) {
280                 r = dssdev->platform_enable(dssdev);
281                 if (r)
282                         goto err1;
283         }
284
285         regulator_enable(tpo_td043->vcc_reg);
286
287         /* wait for power up */
288         msleep(160);
289
290         if (gpio_is_valid(nreset_gpio))
291                 gpio_set_value(nreset_gpio, 1);
292
293         tpo_td043_write(tpo_td043->spi, 2,
294                         TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
295         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
296         tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
297         tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
298         tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
299                         tpo_td043->vmirror);
300         tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
301
302         return 0;
303 err1:
304         omapdss_dpi_display_disable(dssdev);
305 err0:
306         return r;
307 }
308
309 static void tpo_td043_power_off(struct omap_dss_device *dssdev)
310 {
311         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
312         int nreset_gpio = dssdev->reset_gpio;
313
314         if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
315                 return;
316
317         tpo_td043_write(tpo_td043->spi, 3,
318                         TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
319
320         if (gpio_is_valid(nreset_gpio))
321                 gpio_set_value(nreset_gpio, 0);
322
323         /* wait for at least 2 vsyncs before cutting off power */
324         msleep(50);
325
326         tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
327
328         regulator_disable(tpo_td043->vcc_reg);
329
330         if (dssdev->platform_disable)
331                 dssdev->platform_disable(dssdev);
332
333         omapdss_dpi_display_disable(dssdev);
334 }
335
336 static int tpo_td043_enable(struct omap_dss_device *dssdev)
337 {
338         int ret;
339
340         dev_dbg(&dssdev->dev, "enable\n");
341
342         ret = tpo_td043_power_on(dssdev);
343         if (ret)
344                 return ret;
345
346         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
347
348         return 0;
349 }
350
351 static void tpo_td043_disable(struct omap_dss_device *dssdev)
352 {
353         dev_dbg(&dssdev->dev, "disable\n");
354
355         tpo_td043_power_off(dssdev);
356
357         dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
358 }
359
360 static int tpo_td043_suspend(struct omap_dss_device *dssdev)
361 {
362         tpo_td043_power_off(dssdev);
363         dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
364         return 0;
365 }
366
367 static int tpo_td043_resume(struct omap_dss_device *dssdev)
368 {
369         int r = 0;
370
371         r = tpo_td043_power_on(dssdev);
372         if (r)
373                 return r;
374
375         dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
376
377         return 0;
378 }
379
380 static int tpo_td043_probe(struct omap_dss_device *dssdev)
381 {
382         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
383         int nreset_gpio = dssdev->reset_gpio;
384         int ret = 0;
385
386         dev_dbg(&dssdev->dev, "probe\n");
387
388         if (tpo_td043 == NULL) {
389                 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
390                 return -ENODEV;
391         }
392
393         dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS |
394                                 OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC;
395         dssdev->panel.timings = tpo_td043_timings;
396         dssdev->ctrl.pixel_size = 24;
397
398         tpo_td043->mode = TPO_R02_MODE_800x480;
399         memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
400
401         tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
402         if (IS_ERR(tpo_td043->vcc_reg)) {
403                 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
404                 ret = PTR_ERR(tpo_td043->vcc_reg);
405                 goto fail_regulator;
406         }
407
408         if (gpio_is_valid(nreset_gpio)) {
409                 ret = gpio_request(nreset_gpio, "lcd reset");
410                 if (ret < 0) {
411                         dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
412                         goto fail_gpio_req;
413                 }
414
415                 ret = gpio_direction_output(nreset_gpio, 0);
416                 if (ret < 0) {
417                         dev_err(&dssdev->dev, "couldn't set GPIO direction\n");
418                         goto fail_gpio_direction;
419                 }
420         }
421
422         ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
423         if (ret)
424                 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
425
426         return 0;
427
428 fail_gpio_direction:
429         gpio_free(nreset_gpio);
430 fail_gpio_req:
431         regulator_put(tpo_td043->vcc_reg);
432 fail_regulator:
433         kfree(tpo_td043);
434         return ret;
435 }
436
437 static void tpo_td043_remove(struct omap_dss_device *dssdev)
438 {
439         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
440         int nreset_gpio = dssdev->reset_gpio;
441
442         dev_dbg(&dssdev->dev, "remove\n");
443
444         sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
445         regulator_put(tpo_td043->vcc_reg);
446         if (gpio_is_valid(nreset_gpio))
447                 gpio_free(nreset_gpio);
448 }
449
450 static struct omap_dss_driver tpo_td043_driver = {
451         .probe          = tpo_td043_probe,
452         .remove         = tpo_td043_remove,
453
454         .enable         = tpo_td043_enable,
455         .disable        = tpo_td043_disable,
456         .suspend        = tpo_td043_suspend,
457         .resume         = tpo_td043_resume,
458         .set_mirror     = tpo_td043_set_hmirror,
459         .get_mirror     = tpo_td043_get_hmirror,
460
461         .driver         = {
462                 .name   = "tpo_td043mtea1_panel",
463                 .owner  = THIS_MODULE,
464         },
465 };
466
467 static int tpo_td043_spi_probe(struct spi_device *spi)
468 {
469         struct omap_dss_device *dssdev = spi->dev.platform_data;
470         struct tpo_td043_device *tpo_td043;
471         int ret;
472
473         if (dssdev == NULL) {
474                 dev_err(&spi->dev, "missing dssdev\n");
475                 return -ENODEV;
476         }
477
478         spi->bits_per_word = 16;
479         spi->mode = SPI_MODE_0;
480
481         ret = spi_setup(spi);
482         if (ret < 0) {
483                 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
484                 return ret;
485         }
486
487         tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
488         if (tpo_td043 == NULL)
489                 return -ENOMEM;
490
491         tpo_td043->spi = spi;
492         dev_set_drvdata(&spi->dev, tpo_td043);
493         dev_set_drvdata(&dssdev->dev, tpo_td043);
494
495         omap_dss_register_driver(&tpo_td043_driver);
496
497         return 0;
498 }
499
500 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
501 {
502         struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
503
504         omap_dss_unregister_driver(&tpo_td043_driver);
505         kfree(tpo_td043);
506
507         return 0;
508 }
509
510 static struct spi_driver tpo_td043_spi_driver = {
511         .driver = {
512                 .name   = "tpo_td043mtea1_panel_spi",
513                 .bus    = &spi_bus_type,
514                 .owner  = THIS_MODULE,
515         },
516         .probe  = tpo_td043_spi_probe,
517         .remove = __devexit_p(tpo_td043_spi_remove),
518 };
519
520 static int __init tpo_td043_init(void)
521 {
522         return spi_register_driver(&tpo_td043_spi_driver);
523 }
524
525 static void __exit tpo_td043_exit(void)
526 {
527         spi_unregister_driver(&tpo_td043_spi_driver);
528 }
529
530 module_init(tpo_td043_init);
531 module_exit(tpo_td043_exit);
532
533 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
534 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
535 MODULE_LICENSE("GPL");