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9#include <linux/delay.h>
10#include <linux/err.h>
11#include <linux/gpio/consumer.h>
12#include <linux/module.h>
13#include <linux/regulator/consumer.h>
14#include <linux/slab.h>
15#include <linux/spi/spi.h>
16
17#include "../dss/omapdss.h"
18
19#define TPO_R02_MODE(x) ((x) & 7)
20#define TPO_R02_MODE_800x480 7
21#define TPO_R02_NCLK_RISING BIT(3)
22#define TPO_R02_HSYNC_HIGH BIT(4)
23#define TPO_R02_VSYNC_HIGH BIT(5)
24
25#define TPO_R03_NSTANDBY BIT(0)
26#define TPO_R03_EN_CP_CLK BIT(1)
27#define TPO_R03_EN_VGL_PUMP BIT(2)
28#define TPO_R03_EN_PWM BIT(3)
29#define TPO_R03_DRIVING_CAP_100 BIT(4)
30#define TPO_R03_EN_PRE_CHARGE BIT(6)
31#define TPO_R03_SOFTWARE_CTL BIT(7)
32
33#define TPO_R04_NFLIP_H BIT(0)
34#define TPO_R04_NFLIP_V BIT(1)
35#define TPO_R04_CP_CLK_FREQ_1H BIT(2)
36#define TPO_R04_VGL_FREQ_1H BIT(4)
37
38#define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
39 TPO_R03_EN_VGL_PUMP | TPO_R03_EN_PWM | \
40 TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
41 TPO_R03_SOFTWARE_CTL)
42
43#define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
44 TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
45
46static const u16 tpo_td043_def_gamma[12] = {
47 105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
48};
49
50struct panel_drv_data {
51 struct omap_dss_device dssdev;
52
53 struct videomode vm;
54
55 struct spi_device *spi;
56 struct regulator *vcc_reg;
57 struct gpio_desc *reset_gpio;
58 u16 gamma[12];
59 u32 mode;
60 u32 vmirror:1;
61 u32 powered_on:1;
62 u32 spi_suspended:1;
63 u32 power_on_resume:1;
64};
65
66static const struct videomode tpo_td043_vm = {
67 .hactive = 800,
68 .vactive = 480,
69
70 .pixelclock = 36000000,
71
72 .hsync_len = 1,
73 .hfront_porch = 68,
74 .hback_porch = 214,
75
76 .vsync_len = 1,
77 .vfront_porch = 39,
78 .vback_porch = 34,
79
80 .flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
81};
82
83#define to_panel_data(p) container_of(p, struct panel_drv_data, dssdev)
84
85static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
86{
87 struct spi_message m;
88 struct spi_transfer xfer;
89 u16 w;
90 int r;
91
92 spi_message_init(&m);
93
94 memset(&xfer, 0, sizeof(xfer));
95
96 w = ((u16)addr << 10) | (1 << 8) | data;
97 xfer.tx_buf = &w;
98 xfer.bits_per_word = 16;
99 xfer.len = 2;
100 spi_message_add_tail(&xfer, &m);
101
102 r = spi_sync(spi, &m);
103 if (r < 0)
104 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
105 return r;
106}
107
108static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
109{
110 u8 i, val;
111
112
113 for (val = i = 0; i < 4; i++)
114 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
115 tpo_td043_write(spi, 0x11, val);
116
117 for (val = i = 0; i < 4; i++)
118 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
119 tpo_td043_write(spi, 0x12, val);
120
121 for (val = i = 0; i < 4; i++)
122 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
123 tpo_td043_write(spi, 0x13, val);
124
125
126 for (val = i = 0; i < 12; i++)
127 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
128}
129
130static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
131{
132 u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V |
133 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
134 if (h)
135 reg4 &= ~TPO_R04_NFLIP_H;
136 if (v)
137 reg4 &= ~TPO_R04_NFLIP_V;
138
139 return tpo_td043_write(spi, 4, reg4);
140}
141
142static ssize_t tpo_td043_vmirror_show(struct device *dev,
143 struct device_attribute *attr, char *buf)
144{
145 struct panel_drv_data *ddata = dev_get_drvdata(dev);
146
147 return snprintf(buf, PAGE_SIZE, "%d\n", ddata->vmirror);
148}
149
150static ssize_t tpo_td043_vmirror_store(struct device *dev,
151 struct device_attribute *attr, const char *buf, size_t count)
152{
153 struct panel_drv_data *ddata = dev_get_drvdata(dev);
154 int val;
155 int ret;
156
157 ret = kstrtoint(buf, 0, &val);
158 if (ret < 0)
159 return ret;
160
161 val = !!val;
162
163 ret = tpo_td043_write_mirror(ddata->spi, false, val);
164 if (ret < 0)
165 return ret;
166
167 ddata->vmirror = val;
168
169 return count;
170}
171
172static ssize_t tpo_td043_mode_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
174{
175 struct panel_drv_data *ddata = dev_get_drvdata(dev);
176
177 return snprintf(buf, PAGE_SIZE, "%d\n", ddata->mode);
178}
179
180static ssize_t tpo_td043_mode_store(struct device *dev,
181 struct device_attribute *attr, const char *buf, size_t count)
182{
183 struct panel_drv_data *ddata = dev_get_drvdata(dev);
184 long val;
185 int ret;
186
187 ret = kstrtol(buf, 0, &val);
188 if (ret != 0 || val & ~7)
189 return -EINVAL;
190
191 ddata->mode = val;
192
193 val |= TPO_R02_NCLK_RISING;
194 tpo_td043_write(ddata->spi, 2, val);
195
196 return count;
197}
198
199static ssize_t tpo_td043_gamma_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
201{
202 struct panel_drv_data *ddata = dev_get_drvdata(dev);
203 ssize_t len = 0;
204 int ret;
205 int i;
206
207 for (i = 0; i < ARRAY_SIZE(ddata->gamma); i++) {
208 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
209 ddata->gamma[i]);
210 if (ret < 0)
211 return ret;
212 len += ret;
213 }
214 buf[len - 1] = '\n';
215
216 return len;
217}
218
219static ssize_t tpo_td043_gamma_store(struct device *dev,
220 struct device_attribute *attr, const char *buf, size_t count)
221{
222 struct panel_drv_data *ddata = dev_get_drvdata(dev);
223 unsigned int g[12];
224 int ret;
225 int i;
226
227 ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
228 &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
229 &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
230
231 if (ret != 12)
232 return -EINVAL;
233
234 for (i = 0; i < 12; i++)
235 ddata->gamma[i] = g[i];
236
237 tpo_td043_write_gamma(ddata->spi, ddata->gamma);
238
239 return count;
240}
241
242static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
243 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
244static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
245 tpo_td043_mode_show, tpo_td043_mode_store);
246static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
247 tpo_td043_gamma_show, tpo_td043_gamma_store);
248
249static struct attribute *tpo_td043_attrs[] = {
250 &dev_attr_vmirror.attr,
251 &dev_attr_mode.attr,
252 &dev_attr_gamma.attr,
253 NULL,
254};
255
256static const struct attribute_group tpo_td043_attr_group = {
257 .attrs = tpo_td043_attrs,
258};
259
260static int tpo_td043_power_on(struct panel_drv_data *ddata)
261{
262 int r;
263
264 if (ddata->powered_on)
265 return 0;
266
267 r = regulator_enable(ddata->vcc_reg);
268 if (r != 0)
269 return r;
270
271
272 msleep(160);
273
274 gpiod_set_value(ddata->reset_gpio, 0);
275
276 tpo_td043_write(ddata->spi, 2,
277 TPO_R02_MODE(ddata->mode) | TPO_R02_NCLK_RISING);
278 tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_NORMAL);
279 tpo_td043_write(ddata->spi, 0x20, 0xf0);
280 tpo_td043_write(ddata->spi, 0x21, 0xf0);
281 tpo_td043_write_mirror(ddata->spi, false, ddata->vmirror);
282 tpo_td043_write_gamma(ddata->spi, ddata->gamma);
283
284 ddata->powered_on = 1;
285 return 0;
286}
287
288static void tpo_td043_power_off(struct panel_drv_data *ddata)
289{
290 if (!ddata->powered_on)
291 return;
292
293 tpo_td043_write(ddata->spi, 3,
294 TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
295
296 gpiod_set_value(ddata->reset_gpio, 1);
297
298
299 msleep(50);
300
301 tpo_td043_write(ddata->spi, 3, TPO_R03_VAL_STANDBY);
302
303 regulator_disable(ddata->vcc_reg);
304
305 ddata->powered_on = 0;
306}
307
308static int tpo_td043_connect(struct omap_dss_device *src,
309 struct omap_dss_device *dst)
310{
311 return 0;
312}
313
314static void tpo_td043_disconnect(struct omap_dss_device *src,
315 struct omap_dss_device *dst)
316{
317}
318
319static void tpo_td043_enable(struct omap_dss_device *dssdev)
320{
321 struct panel_drv_data *ddata = to_panel_data(dssdev);
322 int r;
323
324
325
326
327
328 if (!ddata->spi_suspended) {
329 r = tpo_td043_power_on(ddata);
330 if (r) {
331 dev_err(&ddata->spi->dev, "%s: power on failed (%d)\n",
332 __func__, r);
333 return;
334 }
335 }
336}
337
338static void tpo_td043_disable(struct omap_dss_device *dssdev)
339{
340 struct panel_drv_data *ddata = to_panel_data(dssdev);
341
342 if (!ddata->spi_suspended)
343 tpo_td043_power_off(ddata);
344}
345
346static int tpo_td043_get_modes(struct omap_dss_device *dssdev,
347 struct drm_connector *connector)
348{
349 struct panel_drv_data *ddata = to_panel_data(dssdev);
350
351 return omapdss_display_get_modes(connector, &ddata->vm);
352}
353
354static const struct omap_dss_device_ops tpo_td043_ops = {
355 .connect = tpo_td043_connect,
356 .disconnect = tpo_td043_disconnect,
357
358 .enable = tpo_td043_enable,
359 .disable = tpo_td043_disable,
360
361 .get_modes = tpo_td043_get_modes,
362};
363
364static int tpo_td043_probe(struct spi_device *spi)
365{
366 struct panel_drv_data *ddata;
367 struct omap_dss_device *dssdev;
368 struct gpio_desc *gpio;
369 int r;
370
371 dev_dbg(&spi->dev, "%s\n", __func__);
372
373 spi->bits_per_word = 16;
374 spi->mode = SPI_MODE_0;
375
376 r = spi_setup(spi);
377 if (r < 0) {
378 dev_err(&spi->dev, "spi_setup failed: %d\n", r);
379 return r;
380 }
381
382 ddata = devm_kzalloc(&spi->dev, sizeof(*ddata), GFP_KERNEL);
383 if (ddata == NULL)
384 return -ENOMEM;
385
386 dev_set_drvdata(&spi->dev, ddata);
387
388 ddata->spi = spi;
389
390 ddata->mode = TPO_R02_MODE_800x480;
391 memcpy(ddata->gamma, tpo_td043_def_gamma, sizeof(ddata->gamma));
392
393 ddata->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
394 if (IS_ERR(ddata->vcc_reg)) {
395 dev_err(&spi->dev, "failed to get LCD VCC regulator\n");
396 return PTR_ERR(ddata->vcc_reg);
397 }
398
399 gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
400 if (IS_ERR(gpio)) {
401 dev_err(&spi->dev, "failed to get reset gpio\n");
402 return PTR_ERR(gpio);
403 }
404
405 ddata->reset_gpio = gpio;
406
407 r = sysfs_create_group(&spi->dev.kobj, &tpo_td043_attr_group);
408 if (r) {
409 dev_err(&spi->dev, "failed to create sysfs files\n");
410 return r;
411 }
412
413 ddata->vm = tpo_td043_vm;
414
415 dssdev = &ddata->dssdev;
416 dssdev->dev = &spi->dev;
417 dssdev->ops = &tpo_td043_ops;
418 dssdev->type = OMAP_DISPLAY_TYPE_DPI;
419 dssdev->display = true;
420 dssdev->owner = THIS_MODULE;
421 dssdev->of_ports = BIT(0);
422 dssdev->ops_flags = OMAP_DSS_DEVICE_OP_MODES;
423
424
425
426
427
428 dssdev->bus_flags = DRM_BUS_FLAG_DE_HIGH
429 | DRM_BUS_FLAG_SYNC_DRIVE_POSEDGE
430 | DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
431
432 omapdss_display_init(dssdev);
433 omapdss_device_register(dssdev);
434
435 return 0;
436}
437
438static int tpo_td043_remove(struct spi_device *spi)
439{
440 struct panel_drv_data *ddata = dev_get_drvdata(&spi->dev);
441 struct omap_dss_device *dssdev = &ddata->dssdev;
442
443 dev_dbg(&ddata->spi->dev, "%s\n", __func__);
444
445 omapdss_device_unregister(dssdev);
446
447 if (omapdss_device_is_enabled(dssdev))
448 tpo_td043_disable(dssdev);
449
450 sysfs_remove_group(&spi->dev.kobj, &tpo_td043_attr_group);
451
452 return 0;
453}
454
455#ifdef CONFIG_PM_SLEEP
456static int tpo_td043_spi_suspend(struct device *dev)
457{
458 struct panel_drv_data *ddata = dev_get_drvdata(dev);
459
460 dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", ddata);
461
462 ddata->power_on_resume = ddata->powered_on;
463 tpo_td043_power_off(ddata);
464 ddata->spi_suspended = 1;
465
466 return 0;
467}
468
469static int tpo_td043_spi_resume(struct device *dev)
470{
471 struct panel_drv_data *ddata = dev_get_drvdata(dev);
472 int ret;
473
474 dev_dbg(dev, "tpo_td043_spi_resume\n");
475
476 if (ddata->power_on_resume) {
477 ret = tpo_td043_power_on(ddata);
478 if (ret)
479 return ret;
480 }
481 ddata->spi_suspended = 0;
482
483 return 0;
484}
485#endif
486
487static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
488 tpo_td043_spi_suspend, tpo_td043_spi_resume);
489
490static const struct of_device_id tpo_td043_of_match[] = {
491 { .compatible = "omapdss,tpo,td043mtea1", },
492 {},
493};
494
495MODULE_DEVICE_TABLE(of, tpo_td043_of_match);
496
497static struct spi_driver tpo_td043_spi_driver = {
498 .driver = {
499 .name = "panel-tpo-td043mtea1",
500 .pm = &tpo_td043_spi_pm,
501 .of_match_table = tpo_td043_of_match,
502 .suppress_bind_attrs = true,
503 },
504 .probe = tpo_td043_probe,
505 .remove = tpo_td043_remove,
506};
507
508module_spi_driver(tpo_td043_spi_driver);
509
510MODULE_ALIAS("spi:tpo,td043mtea1");
511MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
512MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
513MODULE_LICENSE("GPL");
514
