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 static int tpo_td043_write(struct spi_device
*spi
, u8 addr
, u8 data
)
69 struct spi_transfer xfer
;
75 memset(&xfer
, 0, sizeof(xfer
));
77 w
= ((u16
)addr
<< 10) | (1 << 8) | data
;
79 xfer
.bits_per_word
= 16;
81 spi_message_add_tail(&xfer
, &m
);
83 r
= spi_sync(spi
, &m
);
85 dev_warn(&spi
->dev
, "failed to write to LCD reg (%d)\n", r
);
89 static void tpo_td043_write_gamma(struct spi_device
*spi
, u16 gamma
[12])
93 /* gamma bits [9:8] */
94 for (val
= i
= 0; i
< 4; i
++)
95 val
|= (gamma
[i
] & 0x300) >> ((i
+ 1) * 2);
96 tpo_td043_write(spi
, 0x11, val
);
98 for (val
= i
= 0; i
< 4; i
++)
99 val
|= (gamma
[i
+4] & 0x300) >> ((i
+ 1) * 2);
100 tpo_td043_write(spi
, 0x12, val
);
102 for (val
= i
= 0; i
< 4; i
++)
103 val
|= (gamma
[i
+8] & 0x300) >> ((i
+ 1) * 2);
104 tpo_td043_write(spi
, 0x13, val
);
106 /* gamma bits [7:0] */
107 for (val
= i
= 0; i
< 12; i
++)
108 tpo_td043_write(spi
, 0x14 + i
, gamma
[i
] & 0xff);
111 static int tpo_td043_write_mirror(struct spi_device
*spi
, bool h
, bool v
)
113 u8 reg4
= TPO_R04_NFLIP_H
| TPO_R04_NFLIP_V
| \
114 TPO_R04_CP_CLK_FREQ_1H
| TPO_R04_VGL_FREQ_1H
;
116 reg4
&= ~TPO_R04_NFLIP_H
;
118 reg4
&= ~TPO_R04_NFLIP_V
;
120 return tpo_td043_write(spi
, 4, reg4
);
123 static int tpo_td043_set_hmirror(struct omap_dss_device
*dssdev
, bool enable
)
125 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&dssdev
->dev
);
127 tpo_td043
->hmirror
= enable
;
128 return tpo_td043_write_mirror(tpo_td043
->spi
, tpo_td043
->hmirror
,
132 static bool tpo_td043_get_hmirror(struct omap_dss_device
*dssdev
)
134 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&dssdev
->dev
);
136 return tpo_td043
->hmirror
;
139 static ssize_t
tpo_td043_vmirror_show(struct device
*dev
,
140 struct device_attribute
*attr
, char *buf
)
142 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
144 return snprintf(buf
, PAGE_SIZE
, "%d\n", tpo_td043
->vmirror
);
147 static ssize_t
tpo_td043_vmirror_store(struct device
*dev
,
148 struct device_attribute
*attr
, const char *buf
, size_t count
)
150 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
154 ret
= kstrtoint(buf
, 0, &val
);
160 ret
= tpo_td043_write_mirror(tpo_td043
->spi
, tpo_td043
->hmirror
, val
);
164 tpo_td043
->vmirror
= val
;
169 static ssize_t
tpo_td043_mode_show(struct device
*dev
,
170 struct device_attribute
*attr
, char *buf
)
172 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
174 return snprintf(buf
, PAGE_SIZE
, "%d\n", tpo_td043
->mode
);
177 static ssize_t
tpo_td043_mode_store(struct device
*dev
,
178 struct device_attribute
*attr
, const char *buf
, size_t count
)
180 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
184 ret
= kstrtol(buf
, 0, &val
);
185 if (ret
!= 0 || val
& ~7)
188 tpo_td043
->mode
= val
;
190 val
|= TPO_R02_NCLK_RISING
;
191 tpo_td043_write(tpo_td043
->spi
, 2, val
);
196 static ssize_t
tpo_td043_gamma_show(struct device
*dev
,
197 struct device_attribute
*attr
, char *buf
)
199 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
204 for (i
= 0; i
< ARRAY_SIZE(tpo_td043
->gamma
); i
++) {
205 ret
= snprintf(buf
+ len
, PAGE_SIZE
- len
, "%u ",
206 tpo_td043
->gamma
[i
]);
216 static ssize_t
tpo_td043_gamma_store(struct device
*dev
,
217 struct device_attribute
*attr
, const char *buf
, size_t count
)
219 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
224 ret
= sscanf(buf
, "%u %u %u %u %u %u %u %u %u %u %u %u",
225 &g
[0], &g
[1], &g
[2], &g
[3], &g
[4], &g
[5],
226 &g
[6], &g
[7], &g
[8], &g
[9], &g
[10], &g
[11]);
231 for (i
= 0; i
< 12; i
++)
232 tpo_td043
->gamma
[i
] = g
[i
];
234 tpo_td043_write_gamma(tpo_td043
->spi
, tpo_td043
->gamma
);
239 static DEVICE_ATTR(vmirror
, S_IRUGO
| S_IWUSR
,
240 tpo_td043_vmirror_show
, tpo_td043_vmirror_store
);
241 static DEVICE_ATTR(mode
, S_IRUGO
| S_IWUSR
,
242 tpo_td043_mode_show
, tpo_td043_mode_store
);
243 static DEVICE_ATTR(gamma
, S_IRUGO
| S_IWUSR
,
244 tpo_td043_gamma_show
, tpo_td043_gamma_store
);
246 static struct attribute
*tpo_td043_attrs
[] = {
247 &dev_attr_vmirror
.attr
,
249 &dev_attr_gamma
.attr
,
253 static struct attribute_group tpo_td043_attr_group
= {
254 .attrs
= tpo_td043_attrs
,
257 static const struct omap_video_timings tpo_td043_timings
= {
261 .pixel_clock
= 36000,
271 .vsync_level
= OMAPDSS_SIG_ACTIVE_LOW
,
272 .hsync_level
= OMAPDSS_SIG_ACTIVE_LOW
,
273 .data_pclk_edge
= OMAPDSS_DRIVE_SIG_FALLING_EDGE
,
274 .de_level
= OMAPDSS_SIG_ACTIVE_HIGH
,
275 .sync_pclk_edge
= OMAPDSS_DRIVE_SIG_OPPOSITE_EDGES
,
278 static int tpo_td043_power_on(struct tpo_td043_device
*tpo_td043
)
280 int nreset_gpio
= tpo_td043
->nreset_gpio
;
283 if (tpo_td043
->powered_on
)
286 r
= regulator_enable(tpo_td043
->vcc_reg
);
290 /* wait for panel to stabilize */
293 if (gpio_is_valid(nreset_gpio
))
294 gpio_set_value(nreset_gpio
, 1);
296 tpo_td043_write(tpo_td043
->spi
, 2,
297 TPO_R02_MODE(tpo_td043
->mode
) | TPO_R02_NCLK_RISING
);
298 tpo_td043_write(tpo_td043
->spi
, 3, TPO_R03_VAL_NORMAL
);
299 tpo_td043_write(tpo_td043
->spi
, 0x20, 0xf0);
300 tpo_td043_write(tpo_td043
->spi
, 0x21, 0xf0);
301 tpo_td043_write_mirror(tpo_td043
->spi
, tpo_td043
->hmirror
,
303 tpo_td043_write_gamma(tpo_td043
->spi
, tpo_td043
->gamma
);
305 tpo_td043
->powered_on
= 1;
309 static void tpo_td043_power_off(struct tpo_td043_device
*tpo_td043
)
311 int nreset_gpio
= tpo_td043
->nreset_gpio
;
313 if (!tpo_td043
->powered_on
)
316 tpo_td043_write(tpo_td043
->spi
, 3,
317 TPO_R03_VAL_STANDBY
| TPO_R03_EN_PWM
);
319 if (gpio_is_valid(nreset_gpio
))
320 gpio_set_value(nreset_gpio
, 0);
322 /* wait for at least 2 vsyncs before cutting off power */
325 tpo_td043_write(tpo_td043
->spi
, 3, TPO_R03_VAL_STANDBY
);
327 regulator_disable(tpo_td043
->vcc_reg
);
329 tpo_td043
->powered_on
= 0;
332 static int tpo_td043_enable_dss(struct omap_dss_device
*dssdev
)
334 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&dssdev
->dev
);
337 if (dssdev
->state
== OMAP_DSS_DISPLAY_ACTIVE
)
340 omapdss_dpi_set_timings(dssdev
, &dssdev
->panel
.timings
);
341 omapdss_dpi_set_data_lines(dssdev
, dssdev
->phy
.dpi
.data_lines
);
343 r
= omapdss_dpi_display_enable(dssdev
);
347 if (dssdev
->platform_enable
) {
348 r
= dssdev
->platform_enable(dssdev
);
354 * If we are resuming from system suspend, SPI clocks might not be
355 * enabled yet, so we'll program the LCD from SPI PM resume callback.
357 if (!tpo_td043
->spi_suspended
) {
358 r
= tpo_td043_power_on(tpo_td043
);
363 dssdev
->state
= OMAP_DSS_DISPLAY_ACTIVE
;
367 omapdss_dpi_display_disable(dssdev
);
372 static void tpo_td043_disable_dss(struct omap_dss_device
*dssdev
)
374 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&dssdev
->dev
);
376 if (dssdev
->state
!= OMAP_DSS_DISPLAY_ACTIVE
)
379 if (dssdev
->platform_disable
)
380 dssdev
->platform_disable(dssdev
);
382 omapdss_dpi_display_disable(dssdev
);
384 if (!tpo_td043
->spi_suspended
)
385 tpo_td043_power_off(tpo_td043
);
388 static int tpo_td043_enable(struct omap_dss_device
*dssdev
)
390 dev_dbg(&dssdev
->dev
, "enable\n");
392 return tpo_td043_enable_dss(dssdev
);
395 static void tpo_td043_disable(struct omap_dss_device
*dssdev
)
397 dev_dbg(&dssdev
->dev
, "disable\n");
399 tpo_td043_disable_dss(dssdev
);
401 dssdev
->state
= OMAP_DSS_DISPLAY_DISABLED
;
404 static int tpo_td043_probe(struct omap_dss_device
*dssdev
)
406 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&dssdev
->dev
);
407 int nreset_gpio
= dssdev
->reset_gpio
;
410 dev_dbg(&dssdev
->dev
, "probe\n");
412 if (tpo_td043
== NULL
) {
413 dev_err(&dssdev
->dev
, "missing tpo_td043_device\n");
417 dssdev
->panel
.timings
= tpo_td043_timings
;
418 dssdev
->ctrl
.pixel_size
= 24;
420 tpo_td043
->mode
= TPO_R02_MODE_800x480
;
421 memcpy(tpo_td043
->gamma
, tpo_td043_def_gamma
, sizeof(tpo_td043
->gamma
));
423 tpo_td043
->vcc_reg
= regulator_get(&dssdev
->dev
, "vcc");
424 if (IS_ERR(tpo_td043
->vcc_reg
)) {
425 dev_err(&dssdev
->dev
, "failed to get LCD VCC regulator\n");
426 ret
= PTR_ERR(tpo_td043
->vcc_reg
);
430 if (gpio_is_valid(nreset_gpio
)) {
431 ret
= gpio_request_one(nreset_gpio
, GPIOF_OUT_INIT_LOW
,
434 dev_err(&dssdev
->dev
, "couldn't request reset GPIO\n");
439 ret
= sysfs_create_group(&dssdev
->dev
.kobj
, &tpo_td043_attr_group
);
441 dev_warn(&dssdev
->dev
, "failed to create sysfs files\n");
446 regulator_put(tpo_td043
->vcc_reg
);
452 static void tpo_td043_remove(struct omap_dss_device
*dssdev
)
454 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&dssdev
->dev
);
455 int nreset_gpio
= dssdev
->reset_gpio
;
457 dev_dbg(&dssdev
->dev
, "remove\n");
459 sysfs_remove_group(&dssdev
->dev
.kobj
, &tpo_td043_attr_group
);
460 regulator_put(tpo_td043
->vcc_reg
);
461 if (gpio_is_valid(nreset_gpio
))
462 gpio_free(nreset_gpio
);
465 static void tpo_td043_set_timings(struct omap_dss_device
*dssdev
,
466 struct omap_video_timings
*timings
)
468 omapdss_dpi_set_timings(dssdev
, timings
);
470 dssdev
->panel
.timings
= *timings
;
473 static int tpo_td043_check_timings(struct omap_dss_device
*dssdev
,
474 struct omap_video_timings
*timings
)
476 return dpi_check_timings(dssdev
, timings
);
479 static struct omap_dss_driver tpo_td043_driver
= {
480 .probe
= tpo_td043_probe
,
481 .remove
= tpo_td043_remove
,
483 .enable
= tpo_td043_enable
,
484 .disable
= tpo_td043_disable
,
485 .set_mirror
= tpo_td043_set_hmirror
,
486 .get_mirror
= tpo_td043_get_hmirror
,
488 .set_timings
= tpo_td043_set_timings
,
489 .check_timings
= tpo_td043_check_timings
,
492 .name
= "tpo_td043mtea1_panel",
493 .owner
= THIS_MODULE
,
497 static int tpo_td043_spi_probe(struct spi_device
*spi
)
499 struct omap_dss_device
*dssdev
= spi
->dev
.platform_data
;
500 struct tpo_td043_device
*tpo_td043
;
503 if (dssdev
== NULL
) {
504 dev_err(&spi
->dev
, "missing dssdev\n");
508 spi
->bits_per_word
= 16;
509 spi
->mode
= SPI_MODE_0
;
511 ret
= spi_setup(spi
);
513 dev_err(&spi
->dev
, "spi_setup failed: %d\n", ret
);
517 tpo_td043
= kzalloc(sizeof(*tpo_td043
), GFP_KERNEL
);
518 if (tpo_td043
== NULL
)
521 tpo_td043
->spi
= spi
;
522 tpo_td043
->nreset_gpio
= dssdev
->reset_gpio
;
523 dev_set_drvdata(&spi
->dev
, tpo_td043
);
524 dev_set_drvdata(&dssdev
->dev
, tpo_td043
);
526 omap_dss_register_driver(&tpo_td043_driver
);
531 static int tpo_td043_spi_remove(struct spi_device
*spi
)
533 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(&spi
->dev
);
535 omap_dss_unregister_driver(&tpo_td043_driver
);
541 #ifdef CONFIG_PM_SLEEP
542 static int tpo_td043_spi_suspend(struct device
*dev
)
544 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
546 dev_dbg(dev
, "tpo_td043_spi_suspend, tpo %p\n", tpo_td043
);
548 tpo_td043
->power_on_resume
= tpo_td043
->powered_on
;
549 tpo_td043_power_off(tpo_td043
);
550 tpo_td043
->spi_suspended
= 1;
555 static int tpo_td043_spi_resume(struct device
*dev
)
557 struct tpo_td043_device
*tpo_td043
= dev_get_drvdata(dev
);
560 dev_dbg(dev
, "tpo_td043_spi_resume\n");
562 if (tpo_td043
->power_on_resume
) {
563 ret
= tpo_td043_power_on(tpo_td043
);
567 tpo_td043
->spi_suspended
= 0;
573 static SIMPLE_DEV_PM_OPS(tpo_td043_spi_pm
,
574 tpo_td043_spi_suspend
, tpo_td043_spi_resume
);
576 static struct spi_driver tpo_td043_spi_driver
= {
578 .name
= "tpo_td043mtea1_panel_spi",
579 .owner
= THIS_MODULE
,
580 .pm
= &tpo_td043_spi_pm
,
582 .probe
= tpo_td043_spi_probe
,
583 .remove
= tpo_td043_spi_remove
,
586 module_spi_driver(tpo_td043_spi_driver
);
588 MODULE_AUTHOR("Gražvydas Ignotas <notasas@gmail.com>");
589 MODULE_DESCRIPTION("TPO TD043MTEA1 LCD Driver");
590 MODULE_LICENSE("GPL");