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13#include <linux/module.h>
14#include <linux/delay.h>
15#include <linux/spi/spi.h>
16#include <linux/regulator/consumer.h>
17#include <linux/gpio/consumer.h>
18#include <linux/err.h>
19#include <linux/slab.h>
20#include <linux/of_gpio.h>
21
22#include "../dss/omapdss.h"
23
24#define TPO_R02_MODE(x) ((x) & 7)
25#define TPO_R02_MODE_800x480 7
26#define TPO_R02_NCLK_RISING BIT(3)
27#define TPO_R02_HSYNC_HIGH BIT(4)
28#define TPO_R02_VSYNC_HIGH BIT(5)
29
30#define TPO_R03_NSTANDBY BIT(0)
31#define TPO_R03_EN_CP_CLK BIT(1)
32#define TPO_R03_EN_VGL_PUMP BIT(2)
33#define TPO_R03_EN_PWM BIT(3)
34#define TPO_R03_DRIVING_CAP_100 BIT(4)
35#define TPO_R03_EN_PRE_CHARGE BIT(6)
36#define TPO_R03_SOFTWARE_CTL BIT(7)
37
38#define TPO_R04_NFLIP_H BIT(0)
39#define TPO_R04_NFLIP_V BIT(1)
40#define TPO_R04_CP_CLK_FREQ_1H BIT(2)
41#define TPO_R04_VGL_FREQ_1H BIT(4)
42
43#define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
44 TPO_R03_EN_VGL_PUMP | TPO_R03_EN_PWM | \
45 TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
46 TPO_R03_SOFTWARE_CTL)
47
48#define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
49 TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
50
51static const u16 tpo_td043_def_gamma[12] = {
52 105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
53};
54
55struct panel_drv_data {
56 struct omap_dss_device dssdev;
57 struct omap_dss_device *in;
58
59 struct omap_video_timings videomode;
60
61 int data_lines;
62
63 struct spi_device *spi;
64 struct regulator *vcc_reg;
65 int nreset_gpio;
66 u16 gamma[12];
67 u32 mode;
68 u32 hmirror:1;
69 u32 vmirror:1;
70 u32 powered_on:1;
71 u32 spi_suspended:1;
72 u32 power_on_resume:1;
73};
74
75static const struct omap_video_timings tpo_td043_timings = {
76 .x_res = 800,
77 .y_res = 480,
78
79 .pixelclock = 36000000,
80
81 .hsw = 1,
82 .hfp = 68,
83 .hbp = 214,
84
85 .vsw = 1,
86 .vfp = 39,
87 .vbp = 34,
88
89 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
90 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
91 .data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
92 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
93 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_RISING_EDGE,
94};
95
96#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
97
98static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
99{
100 struct spi_message m;
101 struct spi_transfer xfer;
102 u16 w;
103 int r;
104
105 spi_message_init(&m);
106
107 memset(&xfer, 0, sizeof(xfer));
108
109 w = ((u16)addr << 10) | (1 << 8) | data;
110 xfer.tx_buf = &w;
111 xfer.bits_per_word = 16;
112 xfer.len = 2;
113 spi_message_add_tail(&xfer, &m);
114
115 r = spi_sync(spi, &m);
116 if (r < 0)
117 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
118 return r;
119}
120
121static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
122{
123 u8 i, val;
124
125
126 for (val = i = 0; i < 4; i++)
127 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
128 tpo_td043_write(spi, 0x11, val);
129
130 for (val = i = 0; i < 4; i++)
131 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
132 tpo_td043_write(spi, 0x12, val);
133
134 for (val = i = 0; i < 4; i++)
135 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
136 tpo_td043_write(spi, 0x13, val);
137
138
139 for (val = i = 0; i < 12; i++)
140 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
141}
142
143static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
144{
145 u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V |
146 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
147 if (h)
148 reg4 &= ~TPO_R04_NFLIP_H;
149 if (v)
150 reg4 &= ~TPO_R04_NFLIP_V;
151
152 return tpo_td043_write(spi, 4, reg4);
153}
154
155static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
156{
157 struct panel_drv_data *ddata = dev_get_drvdata(dssdev->dev);
158
159 ddata->hmirror = enable;
160 return tpo_td043_write_mirror(ddata->spi, ddata->hmirror,
161 ddata->vmirror);
162}
163
164static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
165{
166 struct panel_drv_data *ddata = dev_get_drvdata(dssdev->dev);
167
168 return ddata->hmirror;
169}
170
171static ssize_t tpo_td043_vmirror_show(struct device *dev,
172 struct device_attribute *attr, char *buf)
173{
174 struct panel_drv_data *ddata = dev_get_drvdata(dev);
175
176 return snprintf(buf, PAGE_SIZE, "%d\n", ddata->vmirror);
177}
178
179static ssize_t tpo_td043_vmirror_store(struct device *dev,
180 struct device_attribute *attr, const char *buf, size_t count)
181{
182 struct panel_drv_data *ddata = dev_get_drvdata(dev);
183 int val;
184 int ret;
185
186 ret = kstrtoint(buf, 0, &val);
187 if (ret < 0)
188 return ret;
189
190 val = !!val;
191
192 ret = tpo_td043_write_mirror(ddata->spi, ddata->hmirror, val);
193 if (ret < 0)
194 return ret;
195
196 ddata->vmirror = val;
197
198 return count;
199}
200
201static ssize_t tpo_td043_mode_show(struct device *dev,
202 struct device_attribute *attr, char *buf)
203{
204 struct panel_drv_data *ddata = dev_get_drvdata(dev);
205
206 return snprintf(buf, PAGE_SIZE, "%d\n", ddata->mode);
207}
208
209static ssize_t tpo_td043_mode_store(struct device *dev,
210 struct device_attribute *attr, const char *buf, size_t count)
211{
212 struct panel_drv_data *ddata = dev_get_drvdata(dev);
213 long val;
214 int ret;
215
216 ret = kstrtol(buf, 0, &val);
217 if (ret != 0 || val & ~7)
218 return -EINVAL;
219
220 ddata->mode = val;
221
222 val |= TPO_R02_NCLK_RISING;
223 tpo_td043_write(ddata->spi, 2, val);
224
225 return count;
226}
227
228static ssize_t tpo_td043_gamma_show(struct device *dev,
229 struct device_attribute *attr, char *buf)
230{
231 struct panel_drv_data *ddata = dev_get_drvdata(dev);
232 ssize_t len = 0;
233 int ret;
234 int i;
235
236 for (i = 0; i < ARRAY_SIZE(ddata->gamma); i++) {
237 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
238 ddata->gamma[i]);
239 if (ret < 0)
240 return ret;
241 len += ret;
242 }
243 buf[len - 1] = '\n';
244
245 return len;
246}
247
248static ssize_t tpo_td043_gamma_store(struct device *dev,
249 struct device_attribute *attr, const char *buf, size_t count)
250{
251 struct panel_drv_data *ddata = dev_get_drvdata(dev);
252 unsigned int g[12];
253 int ret;
254 int i;
255
256 ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
257 &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
258 &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
259
260 if (ret != 12)
261 return -EINVAL;
262
263 for (i = 0; i < 12; i++)
264 ddata->gamma[i] = g[i];
265
266 tpo_td043_write_gamma(ddata->spi, ddata->gamma);
267
268 return count;
269}
270
271static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
272 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
273static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
274 tpo_td043_mode_show, tpo_td043_mode_store);
275static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
276 tpo_td043_gamma_show, tpo_td043_gamma_store);
277
278static struct attribute *tpo_td043_attrs[] = {
279 &dev_attr_vmirror.attr,
280 &dev_attr_mode.attr,
281 &dev_attr_gamma.attr,
282 NULL,
283};
284
285static struct attribute_group tpo_td043_attr_group = {
286 .attrs = tpo_td043_attrs,
287};
288
289static int tpo_td043_power_on(struct panel_drv_data *ddata)
290{
291 int r;
292
293 if (ddata->powered_on)
294 return 0;
295
296 r = regulator_enable(ddata->vcc_reg);
297 if (r != 0)
298 return r;
299
300
301 msleep(160);
302
303 if (gpio_is_valid(ddata->nreset_gpio))
304 gpio_set_value(ddata->nreset_gpio, 1);
305
306 tpo_td043_write(ddata->spi, 2,
307 TPO_R02_MODE(ddata->mode) | TPO_R02_NCLK_RISING);
308 tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_NORMAL);
309 tpo_td043_write(ddata->spi, 0x20, 0xf0);
310 tpo_td043_write(ddata->spi, 0x21, 0xf0);
311 tpo_td043_write_mirror(ddata->spi, ddata->hmirror,
312 ddata->vmirror);
313 tpo_td043_write_gamma(ddata->spi, ddata->gamma);
314
315 ddata->powered_on = 1;
316 return 0;
317}
318
319static void tpo_td043_power_off(struct panel_drv_data *ddata)
320{
321 if (!ddata->powered_on)
322 return;
323
324 tpo_td043_write(ddata->spi, 3,
325 TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
326
327 if (gpio_is_valid(ddata->nreset_gpio))
328 gpio_set_value(ddata->nreset_gpio, 0);
329
330
331 msleep(50);
332
333 tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_STANDBY);
334
335 regulator_disable(ddata->vcc_reg);
336
337 ddata->powered_on = 0;
338}
339
340static int tpo_td043_connect(struct omap_dss_device *dssdev)
341{
342 struct panel_drv_data *ddata = to_panel_data(dssdev);
343 struct omap_dss_device *in = ddata->in;
344 int r;
345
346 if (omapdss_device_is_connected(dssdev))
347 return 0;
348
349 r = in->ops.dpi->connect(in, dssdev);
350 if (r)
351 return r;
352
353 return 0;
354}
355
356static void tpo_td043_disconnect(struct omap_dss_device *dssdev)
357{
358 struct panel_drv_data *ddata = to_panel_data(dssdev);
359 struct omap_dss_device *in = ddata->in;
360
361 if (!omapdss_device_is_connected(dssdev))
362 return;
363
364 in->ops.dpi->disconnect(in, dssdev);
365}
366
367static int tpo_td043_enable(struct omap_dss_device *dssdev)
368{
369 struct panel_drv_data *ddata = to_panel_data(dssdev);
370 struct omap_dss_device *in = ddata->in;
371 int r;
372
373 if (!omapdss_device_is_connected(dssdev))
374 return -ENODEV;
375
376 if (omapdss_device_is_enabled(dssdev))
377 return 0;
378
379 if (ddata->data_lines)
380 in->ops.dpi->set_data_lines(in, ddata->data_lines);
381 in->ops.dpi->set_timings(in, &ddata->videomode);
382
383 r = in->ops.dpi->enable(in);
384 if (r)
385 return r;
386
387
388
389
390
391 if (!ddata->spi_suspended) {
392 r = tpo_td043_power_on(ddata);
393 if (r) {
394 in->ops.dpi->disable(in);
395 return r;
396 }
397 }
398
399 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
400
401 return 0;
402}
403
404static void tpo_td043_disable(struct omap_dss_device *dssdev)
405{
406 struct panel_drv_data *ddata = to_panel_data(dssdev);
407 struct omap_dss_device *in = ddata->in;
408
409 if (!omapdss_device_is_enabled(dssdev))
410 return;
411
412 in->ops.dpi->disable(in);
413
414 if (!ddata->spi_suspended)
415 tpo_td043_power_off(ddata);
416
417 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
418}
419
420static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
421 struct omap_video_timings *timings)
422{
423 struct panel_drv_data *ddata = to_panel_data(dssdev);
424 struct omap_dss_device *in = ddata->in;
425
426 ddata->videomode = *timings;
427 dssdev->panel.timings = *timings;
428
429 in->ops.dpi->set_timings(in, timings);
430}
431
432static void tpo_td043_get_timings(struct omap_dss_device *dssdev,
433 struct omap_video_timings *timings)
434{
435 struct panel_drv_data *ddata = to_panel_data(dssdev);
436
437 *timings = ddata->videomode;
438}
439
440static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
441 struct omap_video_timings *timings)
442{
443 struct panel_drv_data *ddata = to_panel_data(dssdev);
444 struct omap_dss_device *in = ddata->in;
445
446 return in->ops.dpi->check_timings(in, timings);
447}
448
449static struct omap_dss_driver tpo_td043_ops = {
450 .connect = tpo_td043_connect,
451 .disconnect = tpo_td043_disconnect,
452
453 .enable = tpo_td043_enable,
454 .disable = tpo_td043_disable,
455
456 .set_timings = tpo_td043_set_timings,
457 .get_timings = tpo_td043_get_timings,
458 .check_timings = tpo_td043_check_timings,
459
460 .set_mirror = tpo_td043_set_hmirror,
461 .get_mirror = tpo_td043_get_hmirror,
462
463 .get_resolution = omapdss_default_get_resolution,
464};
465
466static int tpo_td043_probe_of(struct spi_device *spi)
467{
468 struct device_node *node = spi->dev.of_node;
469 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
470 struct omap_dss_device *in;
471 int gpio;
472
473 gpio = of_get_named_gpio(node, "reset-gpios", 0);
474 if (!gpio_is_valid(gpio)) {
475 dev_err(&spi->dev, "failed to parse enable gpio\n");
476 return gpio;
477 }
478 ddata->nreset_gpio = gpio;
479
480 in = omapdss_of_find_source_for_first_ep(node);
481 if (IS_ERR(in)) {
482 dev_err(&spi->dev, "failed to find video source\n");
483 return PTR_ERR(in);
484 }
485
486 ddata->in = in;
487
488 return 0;
489}
490
491static int tpo_td043_probe(struct spi_device *spi)
492{
493 struct panel_drv_data *ddata;
494 struct omap_dss_device *dssdev;
495 int r;
496
497 dev_dbg(&spi->dev, "%s\n", __func__);
498
499 spi->bits_per_word = 16;
500 spi->mode = SPI_MODE_0;
501
502 r = spi_setup(spi);
503 if (r < 0) {
504 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
505 return r;
506 }
507
508 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
509 if (ddata == NULL)
510 return -ENOMEM;
511
512 dev_set_drvdata(&spi->dev, ddata);
513
514 ddata->spi = spi;
515
516 if (!spi->dev.of_node)
517 return -ENODEV;
518
519 r = tpo_td043_probe_of(spi);
520 if (r)
521 return r;
522
523 ddata->mode = TPO_R02_MODE_800x480;
524 memcpy(ddata->gamma, tpo_td043_def_gamma, sizeof(ddata->gamma));
525
526 ddata->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
527 if (IS_ERR(ddata->vcc_reg)) {
528 dev_err(&spi->dev, "failed to get LCD VCC regulator\n");
529 r = PTR_ERR(ddata->vcc_reg);
530 goto err_regulator;
531 }
532
533 if (gpio_is_valid(ddata->nreset_gpio)) {
534 r = devm_gpio_request_one(&spi->dev,
535 ddata->nreset_gpio, GPIOF_OUT_INIT_LOW,
536 "lcd reset");
537 if (r < 0) {
538 dev_err(&spi->dev, "couldn't request reset GPIO\n");
539 goto err_gpio_req;
540 }
541 }
542
543 r = sysfs_create_group(&spi->dev.kobj, &tpo_td043_attr_group);
544 if (r) {
545 dev_err(&spi->dev, "failed to create sysfs files\n");
546 goto err_sysfs;
547 }
548
549 ddata->videomode = tpo_td043_timings;
550
551 dssdev = &ddata->dssdev;
552 dssdev->dev = &spi->dev;
553 dssdev->driver = &tpo_td043_ops;
554 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
555 dssdev->owner = THIS_MODULE;
556 dssdev->panel.timings = ddata->videomode;
557
558 r = omapdss_register_display(dssdev);
559 if (r) {
560 dev_err(&spi->dev, "Failed to register panel\n");
561 goto err_reg;
562 }
563
564 return 0;
565
566err_reg:
567 sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
568err_sysfs:
569err_gpio_req:
570err_regulator:
571 omap_dss_put_device(ddata->in);
572 return r;
573}
574
575static int tpo_td043_remove(struct spi_device *spi)
576{
577 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
578 struct omap_dss_device *dssdev = &ddata->dssdev;
579 struct omap_dss_device *in = ddata->in;
580
581 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
582
583 omapdss_unregister_display(dssdev);
584
585 tpo_td043_disable(dssdev);
586 tpo_td043_disconnect(dssdev);
587
588 omap_dss_put_device(in);
589
590 sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
591
592 return 0;
593}
594
595#ifdef CONFIG_PM_SLEEP
596static int tpo_td043_spi_suspend(struct device *dev)
597{
598 struct panel_drv_data *ddata = dev_get_drvdata(dev);
599
600 dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", ddata);
601
602 ddata->power_on_resume = ddata->powered_on;
603 tpo_td043_power_off(ddata);
604 ddata->spi_suspended = 1;
605
606 return 0;
607}
608
609static int tpo_td043_spi_resume(struct device *dev)
610{
611 struct panel_drv_data *ddata = dev_get_drvdata(dev);
612 int ret;
613
614 dev_dbg(dev, "tpo_td043_spi_resume\n");
615
616 if (ddata->power_on_resume) {
617 ret = tpo_td043_power_on(ddata);
618 if (ret)
619 return ret;
620 }
621 ddata->spi_suspended = 0;
622
623 return 0;
624}
625#endif
626
627static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
628 tpo_td043_spi_suspend, tpo_td043_spi_resume);
629
630static const struct of_device_id tpo_td043_of_match[] = {
631 { .compatible = "omapdss,tpo,td043mtea1", },
632 {},
633};
634
635MODULE_DEVICE_TABLE(of, tpo_td043_of_match);
636
637static struct spi_driver tpo_td043_spi_driver = {
638 .driver = {
639 .name = "panel-tpo-td043mtea1",
640 .pm = &tpo_td043_spi_pm,
641 .of_match_table = tpo_td043_of_match,
642 .suppress_bind_attrs = true,
643 },
644 .probe = tpo_td043_probe,
645 .remove = tpo_td043_remove,
646};
647
648module_spi_driver(tpo_td043_spi_driver);
649
650MODULE_ALIAS("spi:tpo,td043mtea1");
651MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
652MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
653MODULE_LICENSE("GPL");
654
