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