tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
3 *
4 * Copyright (c) 2004-2006 Richard Purdie
5 *
6 * Based on Sharp's 2.4 Backlight Driver
7 *
8 * Copyright (c) 2008 Marvell International Ltd.
9 * Converted to SPI device based LCD/Backlight device driver
10 * by Eric Miao <eric.miao@marvell.com>
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 *
16 */
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/init.h>
21#include <linux/delay.h>
22#include <linux/gpio.h>
23#include <linux/fb.h>
24#include <linux/lcd.h>
25#include <linux/spi/spi.h>
26#include <linux/spi/corgi_lcd.h>
27#include <asm/mach/sharpsl_param.h>
28
29#define POWER_IS_ON(pwr) ((pwr) <= FB_BLANK_NORMAL)
30
31/* Register Addresses */
32#define RESCTL_ADRS 0x00
33#define PHACTRL_ADRS 0x01
34#define DUTYCTRL_ADRS 0x02
35#define POWERREG0_ADRS 0x03
36#define POWERREG1_ADRS 0x04
37#define GPOR3_ADRS 0x05
38#define PICTRL_ADRS 0x06
39#define POLCTRL_ADRS 0x07
40
41/* Register Bit Definitions */
42#define RESCTL_QVGA 0x01
43#define RESCTL_VGA 0x00
44
45#define POWER1_VW_ON 0x01 /* VW Supply FET ON */
46#define POWER1_GVSS_ON 0x02 /* GVSS(-8V) Power Supply ON */
47#define POWER1_VDD_ON 0x04 /* VDD(8V),SVSS(-4V) Power Supply ON */
48
49#define POWER1_VW_OFF 0x00 /* VW Supply FET OFF */
50#define POWER1_GVSS_OFF 0x00 /* GVSS(-8V) Power Supply OFF */
51#define POWER1_VDD_OFF 0x00 /* VDD(8V),SVSS(-4V) Power Supply OFF */
52
53#define POWER0_COM_DCLK 0x01 /* COM Voltage DC Bias DAC Serial Data Clock */
54#define POWER0_COM_DOUT 0x02 /* COM Voltage DC Bias DAC Serial Data Out */
55#define POWER0_DAC_ON 0x04 /* DAC Power Supply ON */
56#define POWER0_COM_ON 0x08 /* COM Power Supply ON */
57#define POWER0_VCC5_ON 0x10 /* VCC5 Power Supply ON */
58
59#define POWER0_DAC_OFF 0x00 /* DAC Power Supply OFF */
60#define POWER0_COM_OFF 0x00 /* COM Power Supply OFF */
61#define POWER0_VCC5_OFF 0x00 /* VCC5 Power Supply OFF */
62
63#define PICTRL_INIT_STATE 0x01
64#define PICTRL_INIOFF 0x02
65#define PICTRL_POWER_DOWN 0x04
66#define PICTRL_COM_SIGNAL_OFF 0x08
67#define PICTRL_DAC_SIGNAL_OFF 0x10
68
69#define POLCTRL_SYNC_POL_FALL 0x01
70#define POLCTRL_EN_POL_FALL 0x02
71#define POLCTRL_DATA_POL_FALL 0x04
72#define POLCTRL_SYNC_ACT_H 0x08
73#define POLCTRL_EN_ACT_L 0x10
74
75#define POLCTRL_SYNC_POL_RISE 0x00
76#define POLCTRL_EN_POL_RISE 0x00
77#define POLCTRL_DATA_POL_RISE 0x00
78#define POLCTRL_SYNC_ACT_L 0x00
79#define POLCTRL_EN_ACT_H 0x00
80
81#define PHACTRL_PHASE_MANUAL 0x01
82#define DEFAULT_PHAD_QVGA (9)
83#define DEFAULT_COMADJ (125)
84
85struct corgi_lcd {
86 struct spi_device *spi_dev;
87 struct lcd_device *lcd_dev;
88 struct backlight_device *bl_dev;
89
90 int limit_mask;
91 int intensity;
92 int power;
93 int mode;
94 char buf[2];
95
96 int gpio_backlight_on;
97 int gpio_backlight_cont;
98 int gpio_backlight_cont_inverted;
99
100 void (*kick_battery)(void);
101};
102
103static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
104
105static struct corgi_lcd *the_corgi_lcd;
106static unsigned long corgibl_flags;
107#define CORGIBL_SUSPENDED 0x01
108#define CORGIBL_BATTLOW 0x02
109
110/*
111 * This is only a psuedo I2C interface. We can't use the standard kernel
112 * routines as the interface is write only. We just assume the data is acked...
113 */
114static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
115{
116 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
117 udelay(10);
118}
119
120static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
121{
122 lcdtg_ssp_i2c_send(lcd, data);
123 lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
124 lcdtg_ssp_i2c_send(lcd, data);
125}
126
127static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
128{
129 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
130 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
131 lcdtg_ssp_i2c_send(lcd, base);
132}
133
134static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
135{
136 lcdtg_ssp_i2c_send(lcd, base);
137 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
138 lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
139}
140
141static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
142 uint8_t base, uint8_t data)
143{
144 int i;
145 for (i = 0; i < 8; i++) {
146 if (data & 0x80)
147 lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
148 else
149 lcdtg_i2c_send_bit(lcd, base);
150 data <<= 1;
151 }
152}
153
154static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
155{
156 lcdtg_i2c_send_bit(lcd, base);
157}
158
159static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
160 uint8_t base_data, uint8_t data)
161{
162 /* Set Common Voltage to M62332FP via I2C */
163 lcdtg_i2c_send_start(lcd, base_data);
164 lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
165 lcdtg_i2c_wait_ack(lcd, base_data);
166 lcdtg_i2c_send_byte(lcd, base_data, 0x00);
167 lcdtg_i2c_wait_ack(lcd, base_data);
168 lcdtg_i2c_send_byte(lcd, base_data, data);
169 lcdtg_i2c_wait_ack(lcd, base_data);
170 lcdtg_i2c_send_stop(lcd, base_data);
171}
172
173static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
174{
175 struct spi_message msg;
176 struct spi_transfer xfer = {
177 .len = 1,
178 .cs_change = 1,
179 .tx_buf = lcd->buf,
180 };
181
182 lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
183 spi_message_init(&msg);
184 spi_message_add_tail(&xfer, &msg);
185
186 return spi_sync(lcd->spi_dev, &msg);
187}
188
189/* Set Phase Adjust */
190static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
191{
192 int adj;
193
194 switch(mode) {
195 case CORGI_LCD_MODE_VGA:
196 /* Setting for VGA */
197 adj = sharpsl_param.phadadj;
198 adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
199 PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
200 break;
201 case CORGI_LCD_MODE_QVGA:
202 default:
203 /* Setting for QVGA */
204 adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
205 break;
206 }
207
208 corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
209}
210
211static void corgi_lcd_power_on(struct corgi_lcd *lcd)
212{
213 int comadj;
214
215 /* Initialize Internal Logic & Port */
216 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
217 PICTRL_POWER_DOWN | PICTRL_INIOFF |
218 PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
219 PICTRL_DAC_SIGNAL_OFF);
220
221 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
222 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
223 POWER0_COM_OFF | POWER0_VCC5_OFF);
224
225 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
226 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
227
228 /* VDD(+8V), SVSS(-4V) ON */
229 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
230 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
231 mdelay(3);
232
233 /* DAC ON */
234 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
235 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
236 POWER0_COM_OFF | POWER0_VCC5_OFF);
237
238 /* INIB = H, INI = L */
239 /* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
240 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
241 PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
242
243 /* Set Common Voltage */
244 comadj = sharpsl_param.comadj;
245 if (comadj < 0)
246 comadj = DEFAULT_COMADJ;
247
248 lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
249 POWER0_VCC5_OFF, comadj);
250
251 /* VCC5 ON, DAC ON */
252 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
253 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
254 POWER0_COM_OFF | POWER0_VCC5_ON);
255
256 /* GVSS(-8V) ON, VDD ON */
257 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
258 POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
259 mdelay(2);
260
261 /* COM SIGNAL ON (PICTL[3] = L) */
262 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
263
264 /* COM ON, DAC ON, VCC5_ON */
265 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
266 POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
267 POWER0_COM_ON | POWER0_VCC5_ON);
268
269 /* VW ON, GVSS ON, VDD ON */
270 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
271 POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
272
273 /* Signals output enable */
274 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
275
276 /* Set Phase Adjust */
277 lcdtg_set_phadadj(lcd, lcd->mode);
278
279 /* Initialize for Input Signals from ATI */
280 corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
281 POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
282 POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
283 POLCTRL_EN_ACT_H);
284 udelay(1000);
285
286 switch (lcd->mode) {
287 case CORGI_LCD_MODE_VGA:
288 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
289 break;
290 case CORGI_LCD_MODE_QVGA:
291 default:
292 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
293 break;
294 }
295}
296
297static void corgi_lcd_power_off(struct corgi_lcd *lcd)
298{
299 /* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
300 msleep(34);
301
302 /* (1)VW OFF */
303 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
304 POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
305
306 /* (2)COM OFF */
307 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
308 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
309 POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
310
311 /* (3)Set Common Voltage Bias 0V */
312 lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
313 POWER0_VCC5_ON, 0);
314
315 /* (4)GVSS OFF */
316 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
317 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
318
319 /* (5)VCC5 OFF */
320 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
321 POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
322
323 /* (6)Set PDWN, INIOFF, DACOFF */
324 corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
325 PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
326 PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
327
328 /* (7)DAC OFF */
329 corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
330 POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
331
332 /* (8)VDD OFF */
333 corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
334 POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
335}
336
337static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
338{
339 struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
340 int mode = CORGI_LCD_MODE_QVGA;
341
342 if (m->xres == 640 || m->xres == 480)
343 mode = CORGI_LCD_MODE_VGA;
344
345 if (lcd->mode == mode)
346 return 0;
347
348 lcdtg_set_phadadj(lcd, mode);
349
350 switch (mode) {
351 case CORGI_LCD_MODE_VGA:
352 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
353 break;
354 case CORGI_LCD_MODE_QVGA:
355 default:
356 corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
357 break;
358 }
359
360 lcd->mode = mode;
361 return 0;
362}
363
364static int corgi_lcd_set_power(struct lcd_device *ld, int power)
365{
366 struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
367
368 if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
369 corgi_lcd_power_on(lcd);
370
371 if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
372 corgi_lcd_power_off(lcd);
373
374 lcd->power = power;
375 return 0;
376}
377
378static int corgi_lcd_get_power(struct lcd_device *ld)
379{
380 struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
381
382 return lcd->power;
383}
384
385static struct lcd_ops corgi_lcd_ops = {
386 .get_power = corgi_lcd_get_power,
387 .set_power = corgi_lcd_set_power,
388 .set_mode = corgi_lcd_set_mode,
389};
390
391static int corgi_bl_get_intensity(struct backlight_device *bd)
392{
393 struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
394
395 return lcd->intensity;
396}
397
398static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
399{
400 int cont;
401
402 if (intensity > 0x10)
403 intensity += 0x10;
404
405 corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
406
407 /* Bit 5 via GPIO_BACKLIGHT_CONT */
408 cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
409
410 if (gpio_is_valid(lcd->gpio_backlight_cont))
411 gpio_set_value(lcd->gpio_backlight_cont, cont);
412
413 if (gpio_is_valid(lcd->gpio_backlight_on))
414 gpio_set_value(lcd->gpio_backlight_on, intensity);
415
416 if (lcd->kick_battery)
417 lcd->kick_battery();
418
419 lcd->intensity = intensity;
420 return 0;
421}
422
423static int corgi_bl_update_status(struct backlight_device *bd)
424{
425 struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
426 int intensity = bd->props.brightness;
427
428 if (bd->props.power != FB_BLANK_UNBLANK)
429 intensity = 0;
430
431 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
432 intensity = 0;
433
434 if (corgibl_flags & CORGIBL_SUSPENDED)
435 intensity = 0;
436 if (corgibl_flags & CORGIBL_BATTLOW)
437 intensity &= lcd->limit_mask;
438
439 return corgi_bl_set_intensity(lcd, intensity);
440}
441
442void corgi_lcd_limit_intensity(int limit)
443{
444 if (limit)
445 corgibl_flags |= CORGIBL_BATTLOW;
446 else
447 corgibl_flags &= ~CORGIBL_BATTLOW;
448
449 backlight_update_status(the_corgi_lcd->bl_dev);
450}
451EXPORT_SYMBOL(corgi_lcd_limit_intensity);
452
453static struct backlight_ops corgi_bl_ops = {
454 .get_brightness = corgi_bl_get_intensity,
455 .update_status = corgi_bl_update_status,
456};
457
458#ifdef CONFIG_PM
459static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state)
460{
461 struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
462
463 corgibl_flags |= CORGIBL_SUSPENDED;
464 corgi_bl_set_intensity(lcd, 0);
465 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
466 return 0;
467}
468
469static int corgi_lcd_resume(struct spi_device *spi)
470{
471 struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
472
473 corgibl_flags &= ~CORGIBL_SUSPENDED;
474 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
475 backlight_update_status(lcd->bl_dev);
476 return 0;
477}
478#else
479#define corgi_lcd_suspend NULL
480#define corgi_lcd_resume NULL
481#endif
482
483static int setup_gpio_backlight(struct corgi_lcd *lcd,
484 struct corgi_lcd_platform_data *pdata)
485{
486 struct spi_device *spi = lcd->spi_dev;
487 int err;
488
489 lcd->gpio_backlight_on = -1;
490 lcd->gpio_backlight_cont = -1;
491
492 if (gpio_is_valid(pdata->gpio_backlight_on)) {
493 err = gpio_request(pdata->gpio_backlight_on, "BL_ON");
494 if (err) {
495 dev_err(&spi->dev, "failed to request GPIO%d for "
496 "backlight_on\n", pdata->gpio_backlight_on);
497 return err;
498 }
499
500 lcd->gpio_backlight_on = pdata->gpio_backlight_on;
501 gpio_direction_output(lcd->gpio_backlight_on, 0);
502 }
503
504 if (gpio_is_valid(pdata->gpio_backlight_cont)) {
505 err = gpio_request(pdata->gpio_backlight_cont, "BL_CONT");
506 if (err) {
507 dev_err(&spi->dev, "failed to request GPIO%d for "
508 "backlight_cont\n", pdata->gpio_backlight_cont);
509 goto err_free_backlight_on;
510 }
511
512 lcd->gpio_backlight_cont = pdata->gpio_backlight_cont;
513
514 /* spitz and akita use both GPIOs for backlight, and
515 * have inverted polarity of GPIO_BACKLIGHT_CONT
516 */
517 if (gpio_is_valid(lcd->gpio_backlight_on)) {
518 lcd->gpio_backlight_cont_inverted = 1;
519 gpio_direction_output(lcd->gpio_backlight_cont, 1);
520 } else {
521 lcd->gpio_backlight_cont_inverted = 0;
522 gpio_direction_output(lcd->gpio_backlight_cont, 0);
523 }
524 }
525 return 0;
526
527err_free_backlight_on:
528 if (gpio_is_valid(lcd->gpio_backlight_on))
529 gpio_free(lcd->gpio_backlight_on);
530 return err;
531}
532
533static int __devinit corgi_lcd_probe(struct spi_device *spi)
534{
535 struct corgi_lcd_platform_data *pdata = spi->dev.platform_data;
536 struct corgi_lcd *lcd;
537 int ret = 0;
538
539 if (pdata == NULL) {
540 dev_err(&spi->dev, "platform data not available\n");
541 return -EINVAL;
542 }
543
544 lcd = kzalloc(sizeof(struct corgi_lcd), GFP_KERNEL);
545 if (!lcd) {
546 dev_err(&spi->dev, "failed to allocate memory\n");
547 return -ENOMEM;
548 }
549
550 lcd->spi_dev = spi;
551
552 lcd->lcd_dev = lcd_device_register("corgi_lcd", &spi->dev,
553 lcd, &corgi_lcd_ops);
554 if (IS_ERR(lcd->lcd_dev)) {
555 ret = PTR_ERR(lcd->lcd_dev);
556 goto err_free_lcd;
557 }
558 lcd->power = FB_BLANK_POWERDOWN;
559 lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
560
561 lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev,
562 lcd, &corgi_bl_ops);
563 if (IS_ERR(lcd->bl_dev)) {
564 ret = PTR_ERR(lcd->bl_dev);
565 goto err_unregister_lcd;
566 }
567 lcd->bl_dev->props.max_brightness = pdata->max_intensity;
568 lcd->bl_dev->props.brightness = pdata->default_intensity;
569 lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
570
571 ret = setup_gpio_backlight(lcd, pdata);
572 if (ret)
573 goto err_unregister_bl;
574
575 lcd->kick_battery = pdata->kick_battery;
576
577 dev_set_drvdata(&spi->dev, lcd);
578 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
579 backlight_update_status(lcd->bl_dev);
580
581 lcd->limit_mask = pdata->limit_mask;
582 the_corgi_lcd = lcd;
583 return 0;
584
585err_unregister_bl:
586 backlight_device_unregister(lcd->bl_dev);
587err_unregister_lcd:
588 lcd_device_unregister(lcd->lcd_dev);
589err_free_lcd:
590 kfree(lcd);
591 return ret;
592}
593
594static int __devexit corgi_lcd_remove(struct spi_device *spi)
595{
596 struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
597
598 lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
599 lcd->bl_dev->props.brightness = 0;
600 backlight_update_status(lcd->bl_dev);
601 backlight_device_unregister(lcd->bl_dev);
602
603 if (gpio_is_valid(lcd->gpio_backlight_on))
604 gpio_free(lcd->gpio_backlight_on);
605
606 if (gpio_is_valid(lcd->gpio_backlight_cont))
607 gpio_free(lcd->gpio_backlight_cont);
608
609 corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
610 lcd_device_unregister(lcd->lcd_dev);
611 kfree(lcd);
612
613 return 0;
614}
615
616static struct spi_driver corgi_lcd_driver = {
617 .driver = {
618 .name = "corgi-lcd",
619 .owner = THIS_MODULE,
620 },
621 .probe = corgi_lcd_probe,
622 .remove = __devexit_p(corgi_lcd_remove),
623 .suspend = corgi_lcd_suspend,
624 .resume = corgi_lcd_resume,
625};
626
627static int __init corgi_lcd_init(void)
628{
629 return spi_register_driver(&corgi_lcd_driver);
630}
631module_init(corgi_lcd_init);
632
633static void __exit corgi_lcd_exit(void)
634{
635 spi_unregister_driver(&corgi_lcd_driver);
636}
637module_exit(corgi_lcd_exit);
638
639MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
640MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
641MODULE_LICENSE("GPL");