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>
19 #include <plat/display.h>
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)
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)
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)
40 #define TPO_R03_VAL_NORMAL (TPO_R03_NSTANDBY | TPO_R03_EN_CP_CLK | \
41 TPO_R03_EN_VGL_PUMP | TPO_R03_EN_PWM | \
42 TPO_R03_DRIVING_CAP_100 | TPO_R03_EN_PRE_CHARGE | \
45 #define TPO_R03_VAL_STANDBY (TPO_R03_DRIVING_CAP_100 | \
46 TPO_R03_EN_PRE_CHARGE | TPO_R03_SOFTWARE_CTL)
48 static const u16 tpo_td043_def_gamma[12] = {
49 106, 200, 289, 375, 460, 543, 625, 705, 785, 864, 942, 1020
52 struct tpo_td043_device {
53 struct spi_device *spi;
54 struct regulator *vcc_reg;
61 static int tpo_td043_write(struct spi_device *spi, u8 addr, u8 data)
64 struct spi_transfer xfer;
70 memset(&xfer, 0, sizeof(xfer));
72 w = ((u16)addr << 10) | (1 << 8) | data;
74 xfer.bits_per_word = 16;
76 spi_message_add_tail(&xfer, &m);
78 r = spi_sync(spi, &m);
80 dev_warn(&spi->dev, "failed to write to LCD reg (%d)\n", r);
84 static void tpo_td043_write_gamma(struct spi_device *spi, u16 gamma[12])
88 /* gamma bits [9:8] */
89 for (val = i = 0; i < 4; i++)
90 val |= (gamma[i] & 0x300) >> ((i + 1) * 2);
91 tpo_td043_write(spi, 0x11, val);
93 for (val = i = 0; i < 4; i++)
94 val |= (gamma[i+4] & 0x300) >> ((i + 1) * 2);
95 tpo_td043_write(spi, 0x12, val);
97 for (val = i = 0; i < 4; i++)
98 val |= (gamma[i+8] & 0x300) >> ((i + 1) * 2);
99 tpo_td043_write(spi, 0x13, val);
101 /* gamma bits [7:0] */
102 for (val = i = 0; i < 12; i++)
103 tpo_td043_write(spi, 0x14 + i, gamma[i] & 0xff);
106 static int tpo_td043_write_mirror(struct spi_device *spi, bool h, bool v)
108 u8 reg4 = TPO_R04_NFLIP_H | TPO_R04_NFLIP_V | \
109 TPO_R04_CP_CLK_FREQ_1H | TPO_R04_VGL_FREQ_1H;
111 reg4 &= ~TPO_R04_NFLIP_H;
113 reg4 &= ~TPO_R04_NFLIP_V;
115 return tpo_td043_write(spi, 4, reg4);
118 static int tpo_td043_set_hmirror(struct omap_dss_device *dssdev, bool enable)
120 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
122 tpo_td043->hmirror = enable;
123 return tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
127 static bool tpo_td043_get_hmirror(struct omap_dss_device *dssdev)
129 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
131 return tpo_td043->hmirror;
134 static ssize_t tpo_td043_vmirror_show(struct device *dev,
135 struct device_attribute *attr, char *buf)
137 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
139 return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->vmirror);
142 static ssize_t tpo_td043_vmirror_store(struct device *dev,
143 struct device_attribute *attr, const char *buf, size_t count)
145 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
149 ret = strict_strtol(buf, 0, &val);
153 ret = tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror, val);
157 tpo_td043->vmirror = val;
162 static ssize_t tpo_td043_mode_show(struct device *dev,
163 struct device_attribute *attr, char *buf)
165 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
167 return snprintf(buf, PAGE_SIZE, "%d\n", tpo_td043->mode);
170 static ssize_t tpo_td043_mode_store(struct device *dev,
171 struct device_attribute *attr, const char *buf, size_t count)
173 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
177 ret = strict_strtol(buf, 0, &val);
178 if (ret != 0 || val & ~7)
181 tpo_td043->mode = val;
183 val |= TPO_R02_NCLK_RISING;
184 tpo_td043_write(tpo_td043->spi, 2, val);
189 static ssize_t tpo_td043_gamma_show(struct device *dev,
190 struct device_attribute *attr, char *buf)
192 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
197 for (i = 0; i < ARRAY_SIZE(tpo_td043->gamma); i++) {
198 ret = snprintf(buf + len, PAGE_SIZE - len, "%u ",
199 tpo_td043->gamma[i]);
209 static ssize_t tpo_td043_gamma_store(struct device *dev,
210 struct device_attribute *attr, const char *buf, size_t count)
212 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(dev);
217 ret = sscanf(buf, "%u %u %u %u %u %u %u %u %u %u %u %u",
218 &g[0], &g[1], &g[2], &g[3], &g[4], &g[5],
219 &g[6], &g[7], &g[8], &g[9], &g[10], &g[11]);
224 for (i = 0; i < 12; i++)
225 tpo_td043->gamma[i] = g[i];
227 tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
232 static DEVICE_ATTR(vmirror, S_IRUGO | S_IWUSR,
233 tpo_td043_vmirror_show, tpo_td043_vmirror_store);
234 static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
235 tpo_td043_mode_show, tpo_td043_mode_store);
236 static DEVICE_ATTR(gamma, S_IRUGO | S_IWUSR,
237 tpo_td043_gamma_show, tpo_td043_gamma_store);
239 static struct attribute *tpo_td043_attrs[] = {
240 &dev_attr_vmirror.attr,
242 &dev_attr_gamma.attr,
246 static struct attribute_group tpo_td043_attr_group = {
247 .attrs = tpo_td043_attrs,
250 static const struct omap_video_timings tpo_td043_timings = {
254 .pixel_clock = 36000,
265 static int tpo_td043_power_on(struct omap_dss_device *dssdev)
267 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
268 int nreset_gpio = dssdev->reset_gpio;
271 r = omapdss_dpi_display_enable(dssdev);
275 if (dssdev->platform_enable) {
276 r = dssdev->platform_enable(dssdev);
281 regulator_enable(tpo_td043->vcc_reg);
283 /* wait for power up */
286 if (gpio_is_valid(nreset_gpio))
287 gpio_set_value(nreset_gpio, 1);
289 tpo_td043_write(tpo_td043->spi, 2,
290 TPO_R02_MODE(tpo_td043->mode) | TPO_R02_NCLK_RISING);
291 tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_NORMAL);
292 tpo_td043_write(tpo_td043->spi, 0x20, 0xf0);
293 tpo_td043_write(tpo_td043->spi, 0x21, 0xf0);
294 tpo_td043_write_mirror(tpo_td043->spi, tpo_td043->hmirror,
296 tpo_td043_write_gamma(tpo_td043->spi, tpo_td043->gamma);
300 omapdss_dpi_display_disable(dssdev);
305 static void tpo_td043_power_off(struct omap_dss_device *dssdev)
307 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
308 int nreset_gpio = dssdev->reset_gpio;
310 tpo_td043_write(tpo_td043->spi, 3,
311 TPO_R03_VAL_STANDBY | TPO_R03_EN_PWM);
313 if (gpio_is_valid(nreset_gpio))
314 gpio_set_value(nreset_gpio, 0);
316 /* wait for at least 2 vsyncs before cutting off power */
319 tpo_td043_write(tpo_td043->spi, 3, TPO_R03_VAL_STANDBY);
321 regulator_disable(tpo_td043->vcc_reg);
323 if (dssdev->platform_disable)
324 dssdev->platform_disable(dssdev);
326 omapdss_dpi_display_disable(dssdev);
329 static int tpo_td043_enable(struct omap_dss_device *dssdev)
333 dev_dbg(&dssdev->dev, "enable\n");
335 ret = tpo_td043_power_on(dssdev);
339 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
344 static void tpo_td043_disable(struct omap_dss_device *dssdev)
346 dev_dbg(&dssdev->dev, "disable\n");
348 tpo_td043_power_off(dssdev);
350 dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
353 static int tpo_td043_suspend(struct omap_dss_device *dssdev)
355 tpo_td043_power_off(dssdev);
356 dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
360 static int tpo_td043_resume(struct omap_dss_device *dssdev)
364 r = tpo_td043_power_on(dssdev);
368 dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
373 static int tpo_td043_probe(struct omap_dss_device *dssdev)
375 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
376 int nreset_gpio = dssdev->reset_gpio;
379 dev_dbg(&dssdev->dev, "probe\n");
381 if (tpo_td043 == NULL) {
382 dev_err(&dssdev->dev, "missing tpo_td043_device\n");
386 dssdev->panel.config = OMAP_DSS_LCD_TFT | OMAP_DSS_LCD_IHS |
387 OMAP_DSS_LCD_IVS | OMAP_DSS_LCD_IPC;
388 dssdev->panel.timings = tpo_td043_timings;
389 dssdev->ctrl.pixel_size = 24;
391 tpo_td043->mode = TPO_R02_MODE_800x480;
392 memcpy(tpo_td043->gamma, tpo_td043_def_gamma, sizeof(tpo_td043->gamma));
394 tpo_td043->vcc_reg = regulator_get(&dssdev->dev, "vcc");
395 if (IS_ERR(tpo_td043->vcc_reg)) {
396 dev_err(&dssdev->dev, "failed to get LCD VCC regulator\n");
397 ret = PTR_ERR(tpo_td043->vcc_reg);
401 if (gpio_is_valid(nreset_gpio)) {
402 ret = gpio_request(nreset_gpio, "lcd reset");
404 dev_err(&dssdev->dev, "couldn't request reset GPIO\n");
408 ret = gpio_direction_output(nreset_gpio, 0);
410 dev_err(&dssdev->dev, "couldn't set GPIO direction\n");
411 goto fail_gpio_direction;
415 ret = sysfs_create_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
417 dev_warn(&dssdev->dev, "failed to create sysfs files\n");
422 gpio_free(nreset_gpio);
424 regulator_put(tpo_td043->vcc_reg);
430 static void tpo_td043_remove(struct omap_dss_device *dssdev)
432 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&dssdev->dev);
433 int nreset_gpio = dssdev->reset_gpio;
435 dev_dbg(&dssdev->dev, "remove\n");
437 sysfs_remove_group(&dssdev->dev.kobj, &tpo_td043_attr_group);
438 regulator_put(tpo_td043->vcc_reg);
439 if (gpio_is_valid(nreset_gpio))
440 gpio_free(nreset_gpio);
443 static struct omap_dss_driver tpo_td043_driver = {
444 .probe = tpo_td043_probe,
445 .remove = tpo_td043_remove,
447 .enable = tpo_td043_enable,
448 .disable = tpo_td043_disable,
449 .suspend = tpo_td043_suspend,
450 .resume = tpo_td043_resume,
451 .set_mirror = tpo_td043_set_hmirror,
452 .get_mirror = tpo_td043_get_hmirror,
455 .name = "tpo_td043mtea1_panel",
456 .owner = THIS_MODULE,
460 static int tpo_td043_spi_probe(struct spi_device *spi)
462 struct omap_dss_device *dssdev = spi->dev.platform_data;
463 struct tpo_td043_device *tpo_td043;
466 if (dssdev == NULL) {
467 dev_err(&spi->dev, "missing dssdev\n");
471 spi->bits_per_word = 16;
472 spi->mode = SPI_MODE_0;
474 ret = spi_setup(spi);
476 dev_err(&spi->dev, "spi_setup failed: %d\n", ret);
480 tpo_td043 = kzalloc(sizeof(*tpo_td043), GFP_KERNEL);
481 if (tpo_td043 == NULL)
484 tpo_td043->spi = spi;
485 dev_set_drvdata(&spi->dev, tpo_td043);
486 dev_set_drvdata(&dssdev->dev, tpo_td043);
488 omap_dss_register_driver(&tpo_td043_driver);
493 static int __devexit tpo_td043_spi_remove(struct spi_device *spi)
495 struct tpo_td043_device *tpo_td043 = dev_get_drvdata(&spi->dev);
497 omap_dss_unregister_driver(&tpo_td043_driver);
503 static struct spi_driver tpo_td043_spi_driver = {
505 .name = "tpo_td043mtea1_panel_spi",
506 .bus = &spi_bus_type,
507 .owner = THIS_MODULE,
509 .probe = tpo_td043_spi_probe,
510 .remove = __devexit_p(tpo_td043_spi_remove),
513 static int __init tpo_td043_init(void)
515 return spi_register_driver(&tpo_td043_spi_driver);
518 static void __exit tpo_td043_exit(void)
520 spi_unregister_driver(&tpo_td043_spi_driver);
523 module_init(tpo_td043_init);
524 module_exit(tpo_td043_exit);
526 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
527 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
528 MODULE_LICENSE("GPL");