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12#include <linux/delay.h>
13#include <linux/module.h>
14#include <linux/regulator/consumer.h>
15#include <linux/spi/spi.h>
16
17#include <drm/drm_connector.h>
18#include <drm/drm_modes.h>
19#include <drm/drm_panel.h>
20
21#define TPO_R02_MODE(x) ((x) & 7)
22#define TPO_R02_MODE_800x480 7
23#define TPO_R02_NCLK_RISING BIT(3)
24#define TPO_R02_HSYNC_HIGH BIT(4)
25#define TPO_R02_VSYNC_HIGH BIT(5)
26
27#define TPO_R03_NSTANDBY BIT(0)
28#define TPO_R03_EN_CP_CLK BIT(1)
29#define TPO_R03_EN_VGL_PUMP BIT(2)
30#define TPO_R03_EN_PWM BIT(3)
31#define TPO_R03_DRIVING_CAP_100 BIT(4)
32#define TPO_R03_EN_PRE_CHARGE BIT(6)
33#define TPO_R03_SOFTWARE_CTL BIT(7)
34
35#define TPO_R04_NFLIP_H BIT(0)
36#define TPO_R04_NFLIP_V BIT(1)
37#define TPO_R04_CP_CLK_FREQ_1H BIT(2)
38#define TPO_R04_VGL_FREQ_1H BIT(4)
39
40#define TPO_R03_VAL_NORMAL \
41 (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | TPO_R03_EN_VGL_PUMP | \
42 TPO_R03_EN_PWM | TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
43 TPO_R03_SOFTWARE_CTL)
44
45#define TPO_R03_VAL_STANDBY \
46 (TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
47 TPO_R03_SOFTWARE_CTL)
48
49static const u16 td043mtea1_def_gamma[12] = {
50 105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
51};
52
53struct td043mtea1_panel {
54 struct drm_panel panel;
55
56 struct spi_device *spi;
57 struct regulator *vcc_reg;
58 struct gpio_desc *reset_gpio;
59
60 unsigned int mode;
61 u16 gamma[12];
62 bool vmirror;
63 bool powered_on;
64 bool spi_suspended;
65 bool power_on_resume;
66};
67
68#define to_td043mtea1_device(p) container_of(p, struct td043mtea1_panel, panel)
69
70
71
72
73
74static int td043mtea1_write(struct td043mtea1_panel *lcd, u8 addr, u8 value)
75{
76 struct spi_message msg;
77 struct spi_transfer xfer;
78 u16 data;
79 int ret;
80
81 spi_message_init(&msg);
82
83 memset(&xfer, 0, sizeof(xfer));
84
85 data = ((u16)addr << 10) | (1 << 8) | value;
86 xfer.tx_buf = &data;
87 xfer.bits_per_word = 16;
88 xfer.len = 2;
89 spi_message_add_tail(&xfer, &msg);
90
91 ret = spi_sync(lcd->spi, &msg);
92 if (ret < 0)
93 dev_warn(&lcd->spi->dev, "failed to write to LCD reg (%d)\n",
94 ret);
95
96 return ret;
97}
98
99static void td043mtea1_write_gamma(struct td043mtea1_panel *lcd)
100{
101 const u16 *gamma = lcd->gamma;
102 unsigned int i;
103 u8 val;
104
105
106 for (val = i = 0; i < 4; i++)
107 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
108 td043mtea1_write(lcd, 0x11, val);
109
110 for (val = i = 0; i < 4; i++)
111 val |= (gamma[i + 4] & 0x300) >> ((i + 1) * 2);
112 td043mtea1_write(lcd, 0x12, val);
113
114 for (val = i = 0; i < 4; i++)
115 val |= (gamma[i + 8] & 0x300) >> ((i + 1) * 2);
116 td043mtea1_write(lcd, 0x13, val);
117
118
119 for (i = 0; i < 12; i++)
120 td043mtea1_write(lcd, 0x14 + i, gamma[i] & 0xff);
121}
122
123static int td043mtea1_write_mirror(struct td043mtea1_panel *lcd)
124{
125 u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V |
126 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
127 if (lcd->vmirror)
128 reg4 &= ~TPO_R04_NFLIP_V;
129
130 return td043mtea1_write(lcd, 4, reg4);
131}
132
133static int td043mtea1_power_on(struct td043mtea1_panel *lcd)
134{
135 int ret;
136
137 if (lcd->powered_on)
138 return 0;
139
140 ret = regulator_enable(lcd->vcc_reg);
141 if (ret < 0)
142 return ret;
143
144
145 msleep(160);
146
147 gpiod_set_value(lcd->reset_gpio, 0);
148
149 td043mtea1_write(lcd, 2, TPO_R02_MODE(lcd->mode) | TPO_R02_NCLK_RISING);
150 td043mtea1_write(lcd, 3, TPO_R03_VAL_NORMAL);
151 td043mtea1_write(lcd, 0x20, 0xf0);
152 td043mtea1_write(lcd, 0x21, 0xf0);
153 td043mtea1_write_mirror(lcd);
154 td043mtea1_write_gamma(lcd);
155
156 lcd->powered_on = true;
157
158 return 0;
159}
160
161static void td043mtea1_power_off(struct td043mtea1_panel *lcd)
162{
163 if (!lcd->powered_on)
164 return;
165
166 td043mtea1_write(lcd, 3, TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
167
168 gpiod_set_value(lcd->reset_gpio, 1);
169
170
171 msleep(50);
172
173 td043mtea1_write(lcd, 3, TPO_R03_VAL_STANDBY);
174
175 regulator_disable(lcd->vcc_reg);
176
177 lcd->powered_on = false;
178}
179
180
181
182
183
184static ssize_t vmirror_show(struct device *dev, struct device_attribute *attr,
185 char *buf)
186{
187 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
188
189 return sysfs_emit(buf, "%d\n", lcd->vmirror);
190}
191
192static ssize_t vmirror_store(struct device *dev, struct device_attribute *attr,
193 const char *buf, size_t count)
194{
195 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
196 int val;
197 int ret;
198
199 ret = kstrtoint(buf, 0, &val);
200 if (ret < 0)
201 return ret;
202
203 lcd->vmirror = !!val;
204
205 ret = td043mtea1_write_mirror(lcd);
206 if (ret < 0)
207 return ret;
208
209 return count;
210}
211
212static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
213 char *buf)
214{
215 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
216
217 return sysfs_emit(buf, "%d\n", lcd->mode);
218}
219
220static ssize_t mode_store(struct device *dev, struct device_attribute *attr,
221 const char *buf, size_t count)
222{
223 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
224 long val;
225 int ret;
226
227 ret = kstrtol(buf, 0, &val);
228 if (ret != 0 || val & ~7)
229 return -EINVAL;
230
231 lcd->mode = val;
232
233 val |= TPO_R02_NCLK_RISING;
234 td043mtea1_write(lcd, 2, val);
235
236 return count;
237}
238
239static ssize_t gamma_show(struct device *dev, struct device_attribute *attr,
240 char *buf)
241{
242 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
243 ssize_t len = 0;
244 unsigned int i;
245 int ret;
246
247 for (i = 0; i < ARRAY_SIZE(lcd->gamma); i++) {
248 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
249 lcd->gamma[i]);
250 if (ret < 0)
251 return ret;
252 len += ret;
253 }
254 buf[len - 1] = '\n';
255
256 return len;
257}
258
259static ssize_t gamma_store(struct device *dev, struct device_attribute *attr,
260 const char *buf, size_t count)
261{
262 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
263 unsigned int g[12];
264 unsigned int i;
265 int ret;
266
267 ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
268 &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
269 &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
270 if (ret != 12)
271 return -EINVAL;
272
273 for (i = 0; i < 12; i++)
274 lcd->gamma[i] = g[i];
275
276 td043mtea1_write_gamma(lcd);
277
278 return count;
279}
280
281static DEVICE_ATTR_RW(vmirror);
282static DEVICE_ATTR_RW(mode);
283static DEVICE_ATTR_RW(gamma);
284
285static struct attribute *td043mtea1_attrs[] = {
286 &dev_attr_vmirror.attr,
287 &dev_attr_mode.attr,
288 &dev_attr_gamma.attr,
289 NULL,
290};
291
292static const struct attribute_group td043mtea1_attr_group = {
293 .attrs = td043mtea1_attrs,
294};
295
296
297
298
299
300static int td043mtea1_unprepare(struct drm_panel *panel)
301{
302 struct td043mtea1_panel *lcd = to_td043mtea1_device(panel);
303
304 if (!lcd->spi_suspended)
305 td043mtea1_power_off(lcd);
306
307 return 0;
308}
309
310static int td043mtea1_prepare(struct drm_panel *panel)
311{
312 struct td043mtea1_panel *lcd = to_td043mtea1_device(panel);
313 int ret;
314
315
316
317
318
319 if (lcd->spi_suspended)
320 return 0;
321
322 ret = td043mtea1_power_on(lcd);
323 if (ret) {
324 dev_err(&lcd->spi->dev, "%s: power on failed (%d)\n",
325 __func__, ret);
326 return ret;
327 }
328
329 return 0;
330}
331
332static const struct drm_display_mode td043mtea1_mode = {
333 .clock = 36000,
334 .hdisplay = 800,
335 .hsync_start = 800 + 68,
336 .hsync_end = 800 + 68 + 1,
337 .htotal = 800 + 68 + 1 + 214,
338 .vdisplay = 480,
339 .vsync_start = 480 + 39,
340 .vsync_end = 480 + 39 + 1,
341 .vtotal = 480 + 39 + 1 + 34,
342 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
343 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
344 .width_mm = 94,
345 .height_mm = 56,
346};
347
348static int td043mtea1_get_modes(struct drm_panel *panel,
349 struct drm_connector *connector)
350{
351 struct drm_display_mode *mode;
352
353 mode = drm_mode_duplicate(connector->dev, &td043mtea1_mode);
354 if (!mode)
355 return -ENOMEM;
356
357 drm_mode_set_name(mode);
358 drm_mode_probed_add(connector, mode);
359
360 connector->display_info.width_mm = td043mtea1_mode.width_mm;
361 connector->display_info.height_mm = td043mtea1_mode.height_mm;
362
363
364
365
366
367
368 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
369 | DRM_BUS_FLAG_SYNC_SAMPLE_NEGEDGE
370 | DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE;
371
372 return 1;
373}
374
375static const struct drm_panel_funcs td043mtea1_funcs = {
376 .unprepare = td043mtea1_unprepare,
377 .prepare = td043mtea1_prepare,
378 .get_modes = td043mtea1_get_modes,
379};
380
381
382
383
384
385static int __maybe_unused td043mtea1_suspend(struct device *dev)
386{
387 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
388
389 if (lcd->powered_on) {
390 td043mtea1_power_off(lcd);
391 lcd->powered_on = true;
392 }
393
394 lcd->spi_suspended = true;
395
396 return 0;
397}
398
399static int __maybe_unused td043mtea1_resume(struct device *dev)
400{
401 struct td043mtea1_panel *lcd = dev_get_drvdata(dev);
402 int ret;
403
404 lcd->spi_suspended = false;
405
406 if (lcd->powered_on) {
407 lcd->powered_on = false;
408 ret = td043mtea1_power_on(lcd);
409 if (ret)
410 return ret;
411 }
412
413 return 0;
414}
415
416static SIMPLE_DEV_PM_OPS(td043mtea1_pm_ops, td043mtea1_suspend,
417 td043mtea1_resume);
418
419static int td043mtea1_probe(struct spi_device *spi)
420{
421 struct td043mtea1_panel *lcd;
422 int ret;
423
424 lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);
425 if (lcd == NULL)
426 return -ENOMEM;
427
428 spi_set_drvdata(spi, lcd);
429 lcd->spi = spi;
430 lcd->mode = TPO_R02_MODE_800x480;
431 memcpy(lcd->gamma, td043mtea1_def_gamma, sizeof(lcd->gamma));
432
433 lcd->vcc_reg = devm_regulator_get(&spi->dev, "vcc");
434 if (IS_ERR(lcd->vcc_reg)) {
435 dev_err(&spi->dev, "failed to get VCC regulator\n");
436 return PTR_ERR(lcd->vcc_reg);
437 }
438
439 lcd->reset_gpio = devm_gpiod_get(&spi->dev, "reset", GPIOD_OUT_HIGH);
440 if (IS_ERR(lcd->reset_gpio)) {
441 dev_err(&spi->dev, "failed to get reset GPIO\n");
442 return PTR_ERR(lcd->reset_gpio);
443 }
444
445 spi->bits_per_word = 16;
446 spi->mode = SPI_MODE_0;
447
448 ret = spi_setup(spi);
449 if (ret < 0) {
450 dev_err(&spi->dev, "failed to setup SPI: %d\n", ret);
451 return ret;
452 }
453
454 ret = sysfs_create_group(&spi->dev.kobj, &td043mtea1_attr_group);
455 if (ret < 0) {
456 dev_err(&spi->dev, "failed to create sysfs files\n");
457 return ret;
458 }
459
460 drm_panel_init(&lcd->panel, &lcd->spi->dev, &td043mtea1_funcs,
461 DRM_MODE_CONNECTOR_DPI);
462
463 drm_panel_add(&lcd->panel);
464
465 return 0;
466}
467
468static int td043mtea1_remove(struct spi_device *spi)
469{
470 struct td043mtea1_panel *lcd = spi_get_drvdata(spi);
471
472 drm_panel_remove(&lcd->panel);
473 drm_panel_disable(&lcd->panel);
474 drm_panel_unprepare(&lcd->panel);
475
476 sysfs_remove_group(&spi->dev.kobj, &td043mtea1_attr_group);
477
478 return 0;
479}
480
481static const struct of_device_id td043mtea1_of_match[] = {
482 { .compatible = "tpo,td043mtea1", },
483 { },
484};
485
486MODULE_DEVICE_TABLE(of, td043mtea1_of_match);
487
488static const struct spi_device_id td043mtea1_ids[] = {
489 { "td043mtea1", 0 },
490 { }
491};
492
493MODULE_DEVICE_TABLE(spi, td043mtea1_ids);
494
495static struct spi_driver td043mtea1_driver = {
496 .probe = td043mtea1_probe,
497 .remove = td043mtea1_remove,
498 .id_table = td043mtea1_ids,
499 .driver = {
500 .name = "panel-tpo-td043mtea1",
501 .pm = &td043mtea1_pm_ops,
502 .of_match_table = td043mtea1_of_match,
503 },
504};
505
506module_spi_driver(td043mtea1_driver);
507
508MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
509MODULE_DESCRIPTION("TPO TD043MTEA1 Panel Driver");
510MODULE_LICENSE("GPL");
511
