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 	for (i = 0; i < 8; i++) {
147 		if (data & 0x80)
148 			lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
149 		else
150 			lcdtg_i2c_send_bit(lcd, base);
151 		data <<= 1;
152 	}
153 }
154 
155 static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
156 {
157 	lcdtg_i2c_send_bit(lcd, base);
158 }
159 
160 static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
161 				     uint8_t base_data, uint8_t data)
162 {
163 	/* Set Common Voltage to M62332FP via I2C */
164 	lcdtg_i2c_send_start(lcd, base_data);
165 	lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
166 	lcdtg_i2c_wait_ack(lcd, base_data);
167 	lcdtg_i2c_send_byte(lcd, base_data, 0x00);
168 	lcdtg_i2c_wait_ack(lcd, base_data);
169 	lcdtg_i2c_send_byte(lcd, base_data, data);
170 	lcdtg_i2c_wait_ack(lcd, base_data);
171 	lcdtg_i2c_send_stop(lcd, base_data);
172 }
173 
174 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
175 {
176 	struct spi_message msg;
177 	struct spi_transfer xfer = {
178 		.len		= 1,
179 		.cs_change	= 1,
180 		.tx_buf		= lcd->buf,
181 	};
182 
183 	lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
184 	spi_message_init(&msg);
185 	spi_message_add_tail(&xfer, &msg);
186 
187 	return spi_sync(lcd->spi_dev, &msg);
188 }
189 
190 /* Set Phase Adjust */
191 static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
192 {
193 	int adj;
194 
195 	switch (mode) {
196 	case CORGI_LCD_MODE_VGA:
197 		/* Setting for VGA */
198 		adj = sharpsl_param.phadadj;
199 		adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
200 				  PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
201 		break;
202 	case CORGI_LCD_MODE_QVGA:
203 	default:
204 		/* Setting for QVGA */
205 		adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
206 		break;
207 	}
208 
209 	corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
210 }
211 
212 static void corgi_lcd_power_on(struct corgi_lcd *lcd)
213 {
214 	int comadj;
215 
216 	/* Initialize Internal Logic & Port */
217 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
218 			PICTRL_POWER_DOWN | PICTRL_INIOFF |
219 			PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
220 			PICTRL_DAC_SIGNAL_OFF);
221 
222 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
223 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
224 			POWER0_COM_OFF | POWER0_VCC5_OFF);
225 
226 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
227 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
228 
229 	/* VDD(+8V), SVSS(-4V) ON */
230 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
231 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
232 	mdelay(3);
233 
234 	/* DAC ON */
235 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
236 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
237 			POWER0_COM_OFF | POWER0_VCC5_OFF);
238 
239 	/* INIB = H, INI = L  */
240 	/* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
241 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
242 			PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
243 
244 	/* Set Common Voltage */
245 	comadj = sharpsl_param.comadj;
246 	if (comadj < 0)
247 		comadj = DEFAULT_COMADJ;
248 
249 	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
250 				 POWER0_VCC5_OFF, comadj);
251 
252 	/* VCC5 ON, DAC ON */
253 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
254 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
255 			POWER0_COM_OFF | POWER0_VCC5_ON);
256 
257 	/* GVSS(-8V) ON, VDD ON */
258 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
259 			POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
260 	mdelay(2);
261 
262 	/* COM SIGNAL ON (PICTL[3] = L) */
263 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
264 
265 	/* COM ON, DAC ON, VCC5_ON */
266 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
267 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
268 			POWER0_COM_ON | POWER0_VCC5_ON);
269 
270 	/* VW ON, GVSS ON, VDD ON */
271 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
272 			POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
273 
274 	/* Signals output enable */
275 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
276 
277 	/* Set Phase Adjust */
278 	lcdtg_set_phadadj(lcd, lcd->mode);
279 
280 	/* Initialize for Input Signals from ATI */
281 	corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
282 			POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
283 			POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
284 			POLCTRL_EN_ACT_H);
285 	udelay(1000);
286 
287 	switch (lcd->mode) {
288 	case CORGI_LCD_MODE_VGA:
289 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
290 		break;
291 	case CORGI_LCD_MODE_QVGA:
292 	default:
293 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
294 		break;
295 	}
296 }
297 
298 static void corgi_lcd_power_off(struct corgi_lcd *lcd)
299 {
300 	/* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
301 	msleep(34);
302 
303 	/* (1)VW OFF */
304 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
305 			POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
306 
307 	/* (2)COM OFF */
308 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
309 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
310 			POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
311 
312 	/* (3)Set Common Voltage Bias 0V */
313 	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
314 			POWER0_VCC5_ON, 0);
315 
316 	/* (4)GVSS OFF */
317 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
318 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
319 
320 	/* (5)VCC5 OFF */
321 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
322 			POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
323 
324 	/* (6)Set PDWN, INIOFF, DACOFF */
325 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
326 			PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
327 			PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
328 
329 	/* (7)DAC OFF */
330 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
331 			POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
332 
333 	/* (8)VDD OFF */
334 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
335 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
336 }
337 
338 static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
339 {
340 	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
341 	int mode = CORGI_LCD_MODE_QVGA;
342 
343 	if (m->xres == 640 || m->xres == 480)
344 		mode = CORGI_LCD_MODE_VGA;
345 
346 	if (lcd->mode == mode)
347 		return 0;
348 
349 	lcdtg_set_phadadj(lcd, mode);
350 
351 	switch (mode) {
352 	case CORGI_LCD_MODE_VGA:
353 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
354 		break;
355 	case CORGI_LCD_MODE_QVGA:
356 	default:
357 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
358 		break;
359 	}
360 
361 	lcd->mode = mode;
362 	return 0;
363 }
364 
365 static int corgi_lcd_set_power(struct lcd_device *ld, int power)
366 {
367 	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
368 
369 	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
370 		corgi_lcd_power_on(lcd);
371 
372 	if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
373 		corgi_lcd_power_off(lcd);
374 
375 	lcd->power = power;
376 	return 0;
377 }
378 
379 static int corgi_lcd_get_power(struct lcd_device *ld)
380 {
381 	struct corgi_lcd *lcd = dev_get_drvdata(&ld->dev);
382 
383 	return lcd->power;
384 }
385 
386 static struct lcd_ops corgi_lcd_ops = {
387 	.get_power	= corgi_lcd_get_power,
388 	.set_power	= corgi_lcd_set_power,
389 	.set_mode	= corgi_lcd_set_mode,
390 };
391 
392 static int corgi_bl_get_intensity(struct backlight_device *bd)
393 {
394 	struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
395 
396 	return lcd->intensity;
397 }
398 
399 static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
400 {
401 	int cont;
402 
403 	if (intensity > 0x10)
404 		intensity += 0x10;
405 
406 	corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
407 
408 	/* Bit 5 via GPIO_BACKLIGHT_CONT */
409 	cont = !!(intensity & 0x20) ^ lcd->gpio_backlight_cont_inverted;
410 
411 	if (gpio_is_valid(lcd->gpio_backlight_cont))
412 		gpio_set_value_cansleep(lcd->gpio_backlight_cont, cont);
413 
414 	if (gpio_is_valid(lcd->gpio_backlight_on))
415 		gpio_set_value_cansleep(lcd->gpio_backlight_on, intensity);
416 
417 	if (lcd->kick_battery)
418 		lcd->kick_battery();
419 
420 	lcd->intensity = intensity;
421 	return 0;
422 }
423 
424 static int corgi_bl_update_status(struct backlight_device *bd)
425 {
426 	struct corgi_lcd *lcd = dev_get_drvdata(&bd->dev);
427 	int intensity = bd->props.brightness;
428 
429 	if (bd->props.power != FB_BLANK_UNBLANK)
430 		intensity = 0;
431 
432 	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
433 		intensity = 0;
434 
435 	if (corgibl_flags & CORGIBL_SUSPENDED)
436 		intensity = 0;
437 
438 	if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
439 		intensity = lcd->limit_mask;
440 
441 	return corgi_bl_set_intensity(lcd, intensity);
442 }
443 
444 void corgi_lcd_limit_intensity(int limit)
445 {
446 	if (limit)
447 		corgibl_flags |= CORGIBL_BATTLOW;
448 	else
449 		corgibl_flags &= ~CORGIBL_BATTLOW;
450 
451 	backlight_update_status(the_corgi_lcd->bl_dev);
452 }
453 EXPORT_SYMBOL(corgi_lcd_limit_intensity);
454 
455 static const struct backlight_ops corgi_bl_ops = {
456 	.get_brightness	= corgi_bl_get_intensity,
457 	.update_status  = corgi_bl_update_status,
458 };
459 
460 #ifdef CONFIG_PM
461 static int corgi_lcd_suspend(struct spi_device *spi, pm_message_t state)
462 {
463 	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
464 
465 	corgibl_flags |= CORGIBL_SUSPENDED;
466 	corgi_bl_set_intensity(lcd, 0);
467 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
468 	return 0;
469 }
470 
471 static int corgi_lcd_resume(struct spi_device *spi)
472 {
473 	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
474 
475 	corgibl_flags &= ~CORGIBL_SUSPENDED;
476 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
477 	backlight_update_status(lcd->bl_dev);
478 	return 0;
479 }
480 #else
481 #define corgi_lcd_suspend	NULL
482 #define corgi_lcd_resume	NULL
483 #endif
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 = spi->dev.platform_data;
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 		dev_err(&spi->dev, "failed to allocate memory\n");
549 		return -ENOMEM;
550 	}
551 
552 	lcd->spi_dev = spi;
553 
554 	lcd->lcd_dev = lcd_device_register("corgi_lcd", &spi->dev,
555 					lcd, &corgi_lcd_ops);
556 	if (IS_ERR(lcd->lcd_dev))
557 		return PTR_ERR(lcd->lcd_dev);
558 
559 	lcd->power = FB_BLANK_POWERDOWN;
560 	lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
561 
562 	memset(&props, 0, sizeof(struct backlight_properties));
563 	props.type = BACKLIGHT_RAW;
564 	props.max_brightness = pdata->max_intensity;
565 	lcd->bl_dev = backlight_device_register("corgi_bl", &spi->dev, lcd,
566 						&corgi_bl_ops, &props);
567 	if (IS_ERR(lcd->bl_dev)) {
568 		ret = PTR_ERR(lcd->bl_dev);
569 		goto err_unregister_lcd;
570 	}
571 	lcd->bl_dev->props.brightness = pdata->default_intensity;
572 	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
573 
574 	ret = setup_gpio_backlight(lcd, pdata);
575 	if (ret)
576 		goto err_unregister_bl;
577 
578 	lcd->kick_battery = pdata->kick_battery;
579 
580 	dev_set_drvdata(&spi->dev, lcd);
581 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
582 	backlight_update_status(lcd->bl_dev);
583 
584 	lcd->limit_mask = pdata->limit_mask;
585 	the_corgi_lcd = lcd;
586 	return 0;
587 
588 err_unregister_bl:
589 	backlight_device_unregister(lcd->bl_dev);
590 err_unregister_lcd:
591 	lcd_device_unregister(lcd->lcd_dev);
592 	return ret;
593 }
594 
595 static int corgi_lcd_remove(struct spi_device *spi)
596 {
597 	struct corgi_lcd *lcd = dev_get_drvdata(&spi->dev);
598 
599 	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
600 	lcd->bl_dev->props.brightness = 0;
601 	backlight_update_status(lcd->bl_dev);
602 	backlight_device_unregister(lcd->bl_dev);
603 
604 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
605 	lcd_device_unregister(lcd->lcd_dev);
606 
607 	return 0;
608 }
609 
610 static struct spi_driver corgi_lcd_driver = {
611 	.driver		= {
612 		.name	= "corgi-lcd",
613 		.owner	= THIS_MODULE,
614 	},
615 	.probe		= corgi_lcd_probe,
616 	.remove		= corgi_lcd_remove,
617 	.suspend	= corgi_lcd_suspend,
618 	.resume		= corgi_lcd_resume,
619 };
620 
621 module_spi_driver(corgi_lcd_driver);
622 
623 MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
624 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
625 MODULE_LICENSE("GPL");
626 MODULE_ALIAS("spi:corgi-lcd");
627