2 * LCD panel driver for TPO TD043MTEA1
4 * Author: Gražvydas Ignotas <notasas@gmail.com>
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.
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>
20 #include <video/omapdss.h>
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)
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)
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)
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 | \
46 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
47 TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
49 static const u16 tpo_td043_def_gamma[12] = {
50 105, 315, 381, 431, 490, 537, 579, 686, 780, 837, 880, 1023
53 struct tpo_td043_device {
54 struct spi_device *spi;
55 struct regulator *vcc_reg;
63 u32 power_on_resume:1;
66 /* used to pass spi_device from SPI to DSS portion of the driver */
67 static struct tpo_td043_device *g_tpo_td043;
69 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
72 struct spi_transfer xfer;
78 memset(&xfer, 0, sizeof(xfer));
80 w = ((u16)addr << 10) | (1 << 8) | data;
82 xfer.bits_per_word = 16;
84 spi_message_add_tail(&xfer, &m);
86 r = spi_sync(spi, &m);
88 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
92 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
96 /* gamma bits [9:8] */
97 for (val = i = 0; i < 4; i++)
98 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
99 tpo_td043_write(spi, 0x11, val);
101 for (val = i = 0; i < 4; i++)
102 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
103 tpo_td043_write(spi, 0x12, val);
105 for (val = i = 0; i < 4; i++)
106 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
107 tpo_td043_write(spi, 0x13, val);
109 /* gamma bits [7:0] */
110 for (val = i = 0; i < 12; i++)
111 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
114 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
116 u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
117 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
119 reg4 &= ~TPO_R04_NFLIP_H;
121 reg4 &= ~TPO_R04_NFLIP_V;
123 return tpo_td043_write(spi, 4, reg4);
126 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
128 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
130 tpo_td043->hmirror = enable;
131 return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
135 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
137 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
139 return tpo_td043->hmirror;
142 static ssize_t tpo_td043_vmirror_show(struct device *dev,
143 struct device_attribute *attr, char *buf)
145 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
147 return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
150 static ssize_t tpo_td043_vmirror_store(struct device *dev,
151 struct device_attribute *attr, const char *buf, size_t count)
153 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
157 ret = kstrtoint(buf, 0, &val);
163 ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
167 tpo_td043->vmirror = val;
172 static ssize_t tpo_td043_mode_show(struct device *dev,
173 struct device_attribute *attr, char *buf)
175 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
177 return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
180 static ssize_t tpo_td043_mode_store(struct device *dev,
181 struct device_attribute *attr, const char *buf, size_t count)
183 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
187 ret = kstrtol(buf, 0, &val);
188 if (ret != 0 || val & ~7)
191 tpo_td043->mode = val;
193 val |= TPO_R02_NCLK_RISING;
194 tpo_td043_write(tpo_td043->spi, 2, val);
199 static ssize_t tpo_td043_gamma_show(struct device *dev,
200 struct device_attribute *attr, char *buf)
202 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
207 for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
208 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
209 tpo_td043->gamma[i]);
219 static ssize_t tpo_td043_gamma_store(struct device *dev,
220 struct device_attribute *attr, const char *buf, size_t count)
222 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
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]);
234 for (i = 0; i < 12; i++)
235 tpo_td043->gamma[i] = g[i];
237 tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
242 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
243 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
244 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
245 tpo_td043_mode_show, tpo_td043_mode_store);
246 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
247 tpo_td043_gamma_show, tpo_td043_gamma_store);
249 static struct attribute *tpo_td043_attrs[] = {
250 &dev_attr_vmirror.attr,
252 &dev_attr_gamma.attr,
256 static struct attribute_group tpo_td043_attr_group = {
257 .attrs = tpo_td043_attrs,
260 static const struct omap_video_timings tpo_td043_timings = {
264 .pixel_clock = 36000,
274 .vsync_level = OMAPDSS_SIG_ACTIVE_LOW,
275 .hsync_level = OMAPDSS_SIG_ACTIVE_LOW,
276 .data_pclk_edge = OMAPDSS_DRIVE_SIG_FALLING_EDGE,
277 .de_level = OMAPDSS_SIG_ACTIVE_HIGH,
278 .sync_pclk_edge = OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES,
281 static int tpo_td043_power_on(struct tpo_td043_device *tpo_td043)
283 int nreset_gpio = tpo_td043->nreset_gpio;
286 if (tpo_td043->powered_on)
289 r = regulator_enable(tpo_td043->vcc_reg);
293 /* wait for panel to stabilize */
296 if (gpio_is_valid(nreset_gpio))
297 gpio_set_value(nreset_gpio, 1);
299 tpo_td043_write(tpo_td043->spi, 2,
300 TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
301 tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
302 tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
303 tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
304 tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
306 tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
308 tpo_td043->powered_on = 1;
312 static void tpo_td043_power_off(struct tpo_td043_device *tpo_td043)
314 int nreset_gpio = tpo_td043->nreset_gpio;
316 if (!tpo_td043->powered_on)
319 tpo_td043_write(tpo_td043->spi, 3,
320 TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
322 if (gpio_is_valid(nreset_gpio))
323 gpio_set_value(nreset_gpio, 0);
325 /* wait for at least 2 vsyncs before cutting off power */
328 tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
330 regulator_disable(tpo_td043->vcc_reg);
332 tpo_td043->powered_on = 0;
335 static int tpo_td043_enable_dss(struct omap_dss_device *dssdev)
337 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
340 if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
343 omapdss_dpi_set_timings(dssdev, &dssdev->panel.timings);
344 omapdss_dpi_set_data_lines(dssdev, dssdev->phy.dpi.data_lines);
346 r = omapdss_dpi_display_enable(dssdev);
350 if (dssdev->platform_enable) {
351 r = dssdev->platform_enable(dssdev);
357 * If we are resuming from system suspend, SPI clocks might not be
358 * enabled yet, so we'll program the LCD from SPI PM resume callback.
360 if (!tpo_td043->spi_suspended) {
361 r = tpo_td043_power_on(tpo_td043);
366 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
370 omapdss_dpi_display_disable(dssdev);
375 static void tpo_td043_disable_dss(struct omap_dss_device *dssdev)
377 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
379 if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
382 if (dssdev->platform_disable)
383 dssdev->platform_disable(dssdev);
385 omapdss_dpi_display_disable(dssdev);
387 if (!tpo_td043->spi_suspended)
388 tpo_td043_power_off(tpo_td043);
391 static int tpo_td043_enable(struct omap_dss_device *dssdev)
393 dev_dbg(&dssdev->dev, "enable\n");
395 return tpo_td043_enable_dss(dssdev);
398 static void tpo_td043_disable(struct omap_dss_device *dssdev)
400 dev_dbg(&dssdev->dev, "disable\n");
402 tpo_td043_disable_dss(dssdev);
404 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
407 static int tpo_td043_probe(struct omap_dss_device *dssdev)
409 struct tpo_td043_device *tpo_td043 = g_tpo_td043;
410 int nreset_gpio = dssdev->reset_gpio;
413 dev_dbg(&dssdev->dev, "probe\n");
415 if (tpo_td043 == NULL) {
416 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
420 dssdev->panel.timings = tpo_td043_timings;
421 dssdev->ctrl.pixel_size = 24;
423 tpo_td043->mode = TPO_R02_MODE_800x480;
424 memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
426 tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
427 if (IS_ERR(tpo_td043->vcc_reg)) {
428 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
429 ret = PTR_ERR(tpo_td043->vcc_reg);
433 if (gpio_is_valid(nreset_gpio)) {
434 ret = gpio_request_one(nreset_gpio, GPIOF_OUT_INIT_LOW,
437 dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
442 ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
444 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
446 dev_set_drvdata(&dssdev->dev, tpo_td043);
451 regulator_put(tpo_td043->vcc_reg);
457 static void tpo_td043_remove(struct omap_dss_device *dssdev)
459 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
460 int nreset_gpio = dssdev->reset_gpio;
462 dev_dbg(&dssdev->dev, "remove\n");
464 sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
465 regulator_put(tpo_td043->vcc_reg);
466 if (gpio_is_valid(nreset_gpio))
467 gpio_free(nreset_gpio);
470 static void tpo_td043_set_timings(struct omap_dss_device *dssdev,
471 struct omap_video_timings *timings)
473 omapdss_dpi_set_timings(dssdev, timings);
475 dssdev->panel.timings = *timings;
478 static int tpo_td043_check_timings(struct omap_dss_device *dssdev,
479 struct omap_video_timings *timings)
481 return dpi_check_timings(dssdev, timings);
484 static struct omap_dss_driver tpo_td043_driver = {
485 .probe = tpo_td043_probe,
486 .remove = tpo_td043_remove,
488 .enable = tpo_td043_enable,
489 .disable = tpo_td043_disable,
490 .set_mirror = tpo_td043_set_hmirror,
491 .get_mirror = tpo_td043_get_hmirror,
493 .set_timings = tpo_td043_set_timings,
494 .check_timings = tpo_td043_check_timings,
497 .name = "tpo_td043mtea1_panel",
498 .owner = THIS_MODULE,
502 static int tpo_td043_spi_probe(struct spi_device *spi)
504 struct omap_dss_device *dssdev = spi->dev.platform_data;
505 struct tpo_td043_device *tpo_td043;
508 if (dssdev == NULL) {
509 dev_err(&spi->dev, "missing dssdev\n");
513 if (g_tpo_td043 != NULL)
516 spi->bits_per_word = 16;
517 spi->mode = SPI_MODE_0;
519 ret = spi_setup(spi);
521 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
525 tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
526 if (tpo_td043 == NULL)
529 tpo_td043->spi = spi;
530 tpo_td043->nreset_gpio = dssdev->reset_gpio;
531 dev_set_drvdata(&spi->dev, tpo_td043);
532 g_tpo_td043 = tpo_td043;
534 omap_dss_register_driver(&tpo_td043_driver);
539 static int tpo_td043_spi_remove(struct spi_device *spi)
541 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
543 omap_dss_unregister_driver(&tpo_td043_driver);
550 #ifdef CONFIG_PM_SLEEP
551 static int tpo_td043_spi_suspend(struct device *dev)
553 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
555 dev_dbg(dev, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043);
557 tpo_td043->power_on_resume = tpo_td043->powered_on;
558 tpo_td043_power_off(tpo_td043);
559 tpo_td043->spi_suspended = 1;
564 static int tpo_td043_spi_resume(struct device *dev)
566 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
569 dev_dbg(dev, "tpo_td043_spi_resume\n");
571 if (tpo_td043->power_on_resume) {
572 ret = tpo_td043_power_on(tpo_td043);
576 tpo_td043->spi_suspended = 0;
582 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm,
583 tpo_td043_spi_suspend, tpo_td043_spi_resume);
585 static struct spi_driver tpo_td043_spi_driver = {
587 .name = "tpo_td043mtea1_panel_spi",
588 .owner = THIS_MODULE,
589 .pm = &tpo_td043_spi_pm,
591 .probe = tpo_td043_spi_probe,
592 .remove = tpo_td043_spi_remove,
595 module_spi_driver(tpo_td043_spi_driver);
597 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
598 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
599 MODULE_LICENSE("GPL");