1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *  LCD/Backlight Driver for Sharp Zaurus Handhelds (various models)
4  *
5  *  Copyright (c) 2004-2006 Richard Purdie
6  *
7  *  Based on Sharp's 2.4 Backlight Driver
8  *
9  *  Copyright (c) 2008 Marvell International Ltd.
10  *	Converted to SPI device based LCD/Backlight device driver
11  *	by Eric Miao <eric.miao@marvell.com>
12  */
13 
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/delay.h>
18 #include <linux/gpio/consumer.h>
19 #include <linux/fb.h>
20 #include <linux/lcd.h>
21 #include <linux/spi/spi.h>
22 #include <linux/spi/corgi_lcd.h>
23 #include <linux/slab.h>
24 #include <asm/mach/sharpsl_param.h>
25 
26 #define POWER_IS_ON(pwr)	((pwr) <= FB_BLANK_NORMAL)
27 
28 /* Register Addresses */
29 #define RESCTL_ADRS     0x00
30 #define PHACTRL_ADRS    0x01
31 #define DUTYCTRL_ADRS   0x02
32 #define POWERREG0_ADRS  0x03
33 #define POWERREG1_ADRS  0x04
34 #define GPOR3_ADRS      0x05
35 #define PICTRL_ADRS     0x06
36 #define POLCTRL_ADRS    0x07
37 
38 /* Register Bit Definitions */
39 #define RESCTL_QVGA     0x01
40 #define RESCTL_VGA      0x00
41 
42 #define POWER1_VW_ON    0x01  /* VW Supply FET ON */
43 #define POWER1_GVSS_ON  0x02  /* GVSS(-8V) Power Supply ON */
44 #define POWER1_VDD_ON   0x04  /* VDD(8V),SVSS(-4V) Power Supply ON */
45 
46 #define POWER1_VW_OFF   0x00  /* VW Supply FET OFF */
47 #define POWER1_GVSS_OFF 0x00  /* GVSS(-8V) Power Supply OFF */
48 #define POWER1_VDD_OFF  0x00  /* VDD(8V),SVSS(-4V) Power Supply OFF */
49 
50 #define POWER0_COM_DCLK 0x01  /* COM Voltage DC Bias DAC Serial Data Clock */
51 #define POWER0_COM_DOUT 0x02  /* COM Voltage DC Bias DAC Serial Data Out */
52 #define POWER0_DAC_ON   0x04  /* DAC Power Supply ON */
53 #define POWER0_COM_ON   0x08  /* COM Power Supply ON */
54 #define POWER0_VCC5_ON  0x10  /* VCC5 Power Supply ON */
55 
56 #define POWER0_DAC_OFF  0x00  /* DAC Power Supply OFF */
57 #define POWER0_COM_OFF  0x00  /* COM Power Supply OFF */
58 #define POWER0_VCC5_OFF 0x00  /* VCC5 Power Supply OFF */
59 
60 #define PICTRL_INIT_STATE      0x01
61 #define PICTRL_INIOFF          0x02
62 #define PICTRL_POWER_DOWN      0x04
63 #define PICTRL_COM_SIGNAL_OFF  0x08
64 #define PICTRL_DAC_SIGNAL_OFF  0x10
65 
66 #define POLCTRL_SYNC_POL_FALL  0x01
67 #define POLCTRL_EN_POL_FALL    0x02
68 #define POLCTRL_DATA_POL_FALL  0x04
69 #define POLCTRL_SYNC_ACT_H     0x08
70 #define POLCTRL_EN_ACT_L       0x10
71 
72 #define POLCTRL_SYNC_POL_RISE  0x00
73 #define POLCTRL_EN_POL_RISE    0x00
74 #define POLCTRL_DATA_POL_RISE  0x00
75 #define POLCTRL_SYNC_ACT_L     0x00
76 #define POLCTRL_EN_ACT_H       0x00
77 
78 #define PHACTRL_PHASE_MANUAL   0x01
79 #define DEFAULT_PHAD_QVGA     (9)
80 #define DEFAULT_COMADJ        (125)
81 
82 struct corgi_lcd {
83 	struct spi_device	*spi_dev;
84 	struct lcd_device	*lcd_dev;
85 	struct backlight_device	*bl_dev;
86 
87 	int	limit_mask;
88 	int	intensity;
89 	int	power;
90 	int	mode;
91 	char	buf[2];
92 
93 	struct gpio_desc *backlight_on;
94 	struct gpio_desc *backlight_cont;
95 
96 	void (*kick_battery)(void);
97 };
98 
99 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int reg, uint8_t val);
100 
101 static struct corgi_lcd *the_corgi_lcd;
102 static unsigned long corgibl_flags;
103 #define CORGIBL_SUSPENDED     0x01
104 #define CORGIBL_BATTLOW       0x02
105 
106 /*
107  * This is only a pseudo I2C interface. We can't use the standard kernel
108  * routines as the interface is write only. We just assume the data is acked...
109  */
110 static void lcdtg_ssp_i2c_send(struct corgi_lcd *lcd, uint8_t data)
111 {
112 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS, data);
113 	udelay(10);
114 }
115 
116 static void lcdtg_i2c_send_bit(struct corgi_lcd *lcd, uint8_t data)
117 {
118 	lcdtg_ssp_i2c_send(lcd, data);
119 	lcdtg_ssp_i2c_send(lcd, data | POWER0_COM_DCLK);
120 	lcdtg_ssp_i2c_send(lcd, data);
121 }
122 
123 static void lcdtg_i2c_send_start(struct corgi_lcd *lcd, uint8_t base)
124 {
125 	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
126 	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
127 	lcdtg_ssp_i2c_send(lcd, base);
128 }
129 
130 static void lcdtg_i2c_send_stop(struct corgi_lcd *lcd, uint8_t base)
131 {
132 	lcdtg_ssp_i2c_send(lcd, base);
133 	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK);
134 	lcdtg_ssp_i2c_send(lcd, base | POWER0_COM_DCLK | POWER0_COM_DOUT);
135 }
136 
137 static void lcdtg_i2c_send_byte(struct corgi_lcd *lcd,
138 				uint8_t base, uint8_t data)
139 {
140 	int i;
141 
142 	for (i = 0; i < 8; i++) {
143 		if (data & 0x80)
144 			lcdtg_i2c_send_bit(lcd, base | POWER0_COM_DOUT);
145 		else
146 			lcdtg_i2c_send_bit(lcd, base);
147 		data <<= 1;
148 	}
149 }
150 
151 static void lcdtg_i2c_wait_ack(struct corgi_lcd *lcd, uint8_t base)
152 {
153 	lcdtg_i2c_send_bit(lcd, base);
154 }
155 
156 static void lcdtg_set_common_voltage(struct corgi_lcd *lcd,
157 				     uint8_t base_data, uint8_t data)
158 {
159 	/* Set Common Voltage to M62332FP via I2C */
160 	lcdtg_i2c_send_start(lcd, base_data);
161 	lcdtg_i2c_send_byte(lcd, base_data, 0x9c);
162 	lcdtg_i2c_wait_ack(lcd, base_data);
163 	lcdtg_i2c_send_byte(lcd, base_data, 0x00);
164 	lcdtg_i2c_wait_ack(lcd, base_data);
165 	lcdtg_i2c_send_byte(lcd, base_data, data);
166 	lcdtg_i2c_wait_ack(lcd, base_data);
167 	lcdtg_i2c_send_stop(lcd, base_data);
168 }
169 
170 static int corgi_ssp_lcdtg_send(struct corgi_lcd *lcd, int adrs, uint8_t data)
171 {
172 	struct spi_message msg;
173 	struct spi_transfer xfer = {
174 		.len		= 1,
175 		.cs_change	= 0,
176 		.tx_buf		= lcd->buf,
177 	};
178 
179 	lcd->buf[0] = ((adrs & 0x07) << 5) | (data & 0x1f);
180 	spi_message_init(&msg);
181 	spi_message_add_tail(&xfer, &msg);
182 
183 	return spi_sync(lcd->spi_dev, &msg);
184 }
185 
186 /* Set Phase Adjust */
187 static void lcdtg_set_phadadj(struct corgi_lcd *lcd, int mode)
188 {
189 	int adj;
190 
191 	switch (mode) {
192 	case CORGI_LCD_MODE_VGA:
193 		/* Setting for VGA */
194 		adj = sharpsl_param.phadadj;
195 		adj = (adj < 0) ? PHACTRL_PHASE_MANUAL :
196 				  PHACTRL_PHASE_MANUAL | ((adj & 0xf) << 1);
197 		break;
198 	case CORGI_LCD_MODE_QVGA:
199 	default:
200 		/* Setting for QVGA */
201 		adj = (DEFAULT_PHAD_QVGA << 1) | PHACTRL_PHASE_MANUAL;
202 		break;
203 	}
204 
205 	corgi_ssp_lcdtg_send(lcd, PHACTRL_ADRS, adj);
206 }
207 
208 static void corgi_lcd_power_on(struct corgi_lcd *lcd)
209 {
210 	int comadj;
211 
212 	/* Initialize Internal Logic & Port */
213 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
214 			PICTRL_POWER_DOWN | PICTRL_INIOFF |
215 			PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF |
216 			PICTRL_DAC_SIGNAL_OFF);
217 
218 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
219 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_OFF |
220 			POWER0_COM_OFF | POWER0_VCC5_OFF);
221 
222 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
223 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
224 
225 	/* VDD(+8V), SVSS(-4V) ON */
226 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
227 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
228 	mdelay(3);
229 
230 	/* DAC ON */
231 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
232 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
233 			POWER0_COM_OFF | POWER0_VCC5_OFF);
234 
235 	/* INIB = H, INI = L  */
236 	/* PICTL[0] = H , PICTL[1] = PICTL[2] = PICTL[4] = L */
237 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
238 			PICTRL_INIT_STATE | PICTRL_COM_SIGNAL_OFF);
239 
240 	/* Set Common Voltage */
241 	comadj = sharpsl_param.comadj;
242 	if (comadj < 0)
243 		comadj = DEFAULT_COMADJ;
244 
245 	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
246 				 POWER0_VCC5_OFF, comadj);
247 
248 	/* VCC5 ON, DAC ON */
249 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
250 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
251 			POWER0_COM_OFF | POWER0_VCC5_ON);
252 
253 	/* GVSS(-8V) ON, VDD ON */
254 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
255 			POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
256 	mdelay(2);
257 
258 	/* COM SIGNAL ON (PICTL[3] = L) */
259 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_INIT_STATE);
260 
261 	/* COM ON, DAC ON, VCC5_ON */
262 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
263 			POWER0_COM_DCLK | POWER0_COM_DOUT | POWER0_DAC_ON |
264 			POWER0_COM_ON | POWER0_VCC5_ON);
265 
266 	/* VW ON, GVSS ON, VDD ON */
267 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
268 			POWER1_VW_ON | POWER1_GVSS_ON | POWER1_VDD_ON);
269 
270 	/* Signals output enable */
271 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, 0);
272 
273 	/* Set Phase Adjust */
274 	lcdtg_set_phadadj(lcd, lcd->mode);
275 
276 	/* Initialize for Input Signals from ATI */
277 	corgi_ssp_lcdtg_send(lcd, POLCTRL_ADRS,
278 			POLCTRL_SYNC_POL_RISE | POLCTRL_EN_POL_RISE |
279 			POLCTRL_DATA_POL_RISE | POLCTRL_SYNC_ACT_L |
280 			POLCTRL_EN_ACT_H);
281 	udelay(1000);
282 
283 	switch (lcd->mode) {
284 	case CORGI_LCD_MODE_VGA:
285 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
286 		break;
287 	case CORGI_LCD_MODE_QVGA:
288 	default:
289 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
290 		break;
291 	}
292 }
293 
294 static void corgi_lcd_power_off(struct corgi_lcd *lcd)
295 {
296 	/* 60Hz x 2 frame = 16.7msec x 2 = 33.4 msec */
297 	msleep(34);
298 
299 	/* (1)VW OFF */
300 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
301 			POWER1_VW_OFF | POWER1_GVSS_ON | POWER1_VDD_ON);
302 
303 	/* (2)COM OFF */
304 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS, PICTRL_COM_SIGNAL_OFF);
305 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
306 			POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_ON);
307 
308 	/* (3)Set Common Voltage Bias 0V */
309 	lcdtg_set_common_voltage(lcd, POWER0_DAC_ON | POWER0_COM_OFF |
310 			POWER0_VCC5_ON, 0);
311 
312 	/* (4)GVSS OFF */
313 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
314 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_ON);
315 
316 	/* (5)VCC5 OFF */
317 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
318 			POWER0_DAC_ON | POWER0_COM_OFF | POWER0_VCC5_OFF);
319 
320 	/* (6)Set PDWN, INIOFF, DACOFF */
321 	corgi_ssp_lcdtg_send(lcd, PICTRL_ADRS,
322 			PICTRL_INIOFF | PICTRL_DAC_SIGNAL_OFF |
323 			PICTRL_POWER_DOWN | PICTRL_COM_SIGNAL_OFF);
324 
325 	/* (7)DAC OFF */
326 	corgi_ssp_lcdtg_send(lcd, POWERREG0_ADRS,
327 			POWER0_DAC_OFF | POWER0_COM_OFF | POWER0_VCC5_OFF);
328 
329 	/* (8)VDD OFF */
330 	corgi_ssp_lcdtg_send(lcd, POWERREG1_ADRS,
331 			POWER1_VW_OFF | POWER1_GVSS_OFF | POWER1_VDD_OFF);
332 }
333 
334 static int corgi_lcd_set_mode(struct lcd_device *ld, struct fb_videomode *m)
335 {
336 	struct corgi_lcd *lcd = lcd_get_data(ld);
337 	int mode = CORGI_LCD_MODE_QVGA;
338 
339 	if (m->xres == 640 || m->xres == 480)
340 		mode = CORGI_LCD_MODE_VGA;
341 
342 	if (lcd->mode == mode)
343 		return 0;
344 
345 	lcdtg_set_phadadj(lcd, mode);
346 
347 	switch (mode) {
348 	case CORGI_LCD_MODE_VGA:
349 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_VGA);
350 		break;
351 	case CORGI_LCD_MODE_QVGA:
352 	default:
353 		corgi_ssp_lcdtg_send(lcd, RESCTL_ADRS, RESCTL_QVGA);
354 		break;
355 	}
356 
357 	lcd->mode = mode;
358 	return 0;
359 }
360 
361 static int corgi_lcd_set_power(struct lcd_device *ld, int power)
362 {
363 	struct corgi_lcd *lcd = lcd_get_data(ld);
364 
365 	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))
366 		corgi_lcd_power_on(lcd);
367 
368 	if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))
369 		corgi_lcd_power_off(lcd);
370 
371 	lcd->power = power;
372 	return 0;
373 }
374 
375 static int corgi_lcd_get_power(struct lcd_device *ld)
376 {
377 	struct corgi_lcd *lcd = lcd_get_data(ld);
378 
379 	return lcd->power;
380 }
381 
382 static struct lcd_ops corgi_lcd_ops = {
383 	.get_power	= corgi_lcd_get_power,
384 	.set_power	= corgi_lcd_set_power,
385 	.set_mode	= corgi_lcd_set_mode,
386 };
387 
388 static int corgi_bl_get_intensity(struct backlight_device *bd)
389 {
390 	struct corgi_lcd *lcd = bl_get_data(bd);
391 
392 	return lcd->intensity;
393 }
394 
395 static int corgi_bl_set_intensity(struct corgi_lcd *lcd, int intensity)
396 {
397 	int cont;
398 
399 	if (intensity > 0x10)
400 		intensity += 0x10;
401 
402 	corgi_ssp_lcdtg_send(lcd, DUTYCTRL_ADRS, intensity);
403 
404 	/* Bit 5 via GPIO_BACKLIGHT_CONT */
405 	cont = !!(intensity & 0x20);
406 
407 	if (lcd->backlight_cont)
408 		gpiod_set_value_cansleep(lcd->backlight_cont, cont);
409 
410 	if (lcd->backlight_on)
411 		gpiod_set_value_cansleep(lcd->backlight_on, intensity);
412 
413 	if (lcd->kick_battery)
414 		lcd->kick_battery();
415 
416 	lcd->intensity = intensity;
417 	return 0;
418 }
419 
420 static int corgi_bl_update_status(struct backlight_device *bd)
421 {
422 	struct corgi_lcd *lcd = bl_get_data(bd);
423 	int intensity = bd->props.brightness;
424 
425 	if (bd->props.power != FB_BLANK_UNBLANK)
426 		intensity = 0;
427 
428 	if (bd->props.fb_blank != FB_BLANK_UNBLANK)
429 		intensity = 0;
430 
431 	if (corgibl_flags & CORGIBL_SUSPENDED)
432 		intensity = 0;
433 
434 	if ((corgibl_flags & CORGIBL_BATTLOW) && intensity > lcd->limit_mask)
435 		intensity = lcd->limit_mask;
436 
437 	return corgi_bl_set_intensity(lcd, intensity);
438 }
439 
440 void corgi_lcd_limit_intensity(int limit)
441 {
442 	if (limit)
443 		corgibl_flags |= CORGIBL_BATTLOW;
444 	else
445 		corgibl_flags &= ~CORGIBL_BATTLOW;
446 
447 	backlight_update_status(the_corgi_lcd->bl_dev);
448 }
449 EXPORT_SYMBOL(corgi_lcd_limit_intensity);
450 
451 static const struct backlight_ops corgi_bl_ops = {
452 	.get_brightness	= corgi_bl_get_intensity,
453 	.update_status  = corgi_bl_update_status,
454 };
455 
456 #ifdef CONFIG_PM_SLEEP
457 static int corgi_lcd_suspend(struct device *dev)
458 {
459 	struct corgi_lcd *lcd = dev_get_drvdata(dev);
460 
461 	corgibl_flags |= CORGIBL_SUSPENDED;
462 	corgi_bl_set_intensity(lcd, 0);
463 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
464 	return 0;
465 }
466 
467 static int corgi_lcd_resume(struct device *dev)
468 {
469 	struct corgi_lcd *lcd = dev_get_drvdata(dev);
470 
471 	corgibl_flags &= ~CORGIBL_SUSPENDED;
472 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
473 	backlight_update_status(lcd->bl_dev);
474 	return 0;
475 }
476 #endif
477 
478 static SIMPLE_DEV_PM_OPS(corgi_lcd_pm_ops, corgi_lcd_suspend, corgi_lcd_resume);
479 
480 static int setup_gpio_backlight(struct corgi_lcd *lcd,
481 				struct corgi_lcd_platform_data *pdata)
482 {
483 	struct spi_device *spi = lcd->spi_dev;
484 
485 	lcd->backlight_on = devm_gpiod_get_optional(&spi->dev,
486 						    "BL_ON", GPIOD_OUT_LOW);
487 	if (IS_ERR(lcd->backlight_on))
488 		return PTR_ERR(lcd->backlight_on);
489 
490 	lcd->backlight_cont = devm_gpiod_get_optional(&spi->dev, "BL_CONT",
491 						      GPIOD_OUT_LOW);
492 	if (IS_ERR(lcd->backlight_cont))
493 		return PTR_ERR(lcd->backlight_cont);
494 
495 	return 0;
496 }
497 
498 static int corgi_lcd_probe(struct spi_device *spi)
499 {
500 	struct backlight_properties props;
501 	struct corgi_lcd_platform_data *pdata = dev_get_platdata(&spi->dev);
502 	struct corgi_lcd *lcd;
503 	int ret = 0;
504 
505 	if (pdata == NULL) {
506 		dev_err(&spi->dev, "platform data not available\n");
507 		return -EINVAL;
508 	}
509 
510 	lcd = devm_kzalloc(&spi->dev, sizeof(struct corgi_lcd), GFP_KERNEL);
511 	if (!lcd)
512 		return -ENOMEM;
513 
514 	lcd->spi_dev = spi;
515 
516 	lcd->lcd_dev = devm_lcd_device_register(&spi->dev, "corgi_lcd",
517 						&spi->dev, lcd, &corgi_lcd_ops);
518 	if (IS_ERR(lcd->lcd_dev))
519 		return PTR_ERR(lcd->lcd_dev);
520 
521 	lcd->power = FB_BLANK_POWERDOWN;
522 	lcd->mode = (pdata) ? pdata->init_mode : CORGI_LCD_MODE_VGA;
523 
524 	memset(&props, 0, sizeof(struct backlight_properties));
525 	props.type = BACKLIGHT_RAW;
526 	props.max_brightness = pdata->max_intensity;
527 	lcd->bl_dev = devm_backlight_device_register(&spi->dev, "corgi_bl",
528 						&spi->dev, lcd, &corgi_bl_ops,
529 						&props);
530 	if (IS_ERR(lcd->bl_dev))
531 		return PTR_ERR(lcd->bl_dev);
532 
533 	lcd->bl_dev->props.brightness = pdata->default_intensity;
534 	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
535 
536 	ret = setup_gpio_backlight(lcd, pdata);
537 	if (ret)
538 		return ret;
539 
540 	lcd->kick_battery = pdata->kick_battery;
541 
542 	spi_set_drvdata(spi, lcd);
543 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_UNBLANK);
544 	backlight_update_status(lcd->bl_dev);
545 
546 	lcd->limit_mask = pdata->limit_mask;
547 	the_corgi_lcd = lcd;
548 	return 0;
549 }
550 
551 static int corgi_lcd_remove(struct spi_device *spi)
552 {
553 	struct corgi_lcd *lcd = spi_get_drvdata(spi);
554 
555 	lcd->bl_dev->props.power = FB_BLANK_UNBLANK;
556 	lcd->bl_dev->props.brightness = 0;
557 	backlight_update_status(lcd->bl_dev);
558 	corgi_lcd_set_power(lcd->lcd_dev, FB_BLANK_POWERDOWN);
559 	return 0;
560 }
561 
562 static struct spi_driver corgi_lcd_driver = {
563 	.driver		= {
564 		.name	= "corgi-lcd",
565 		.pm	= &corgi_lcd_pm_ops,
566 	},
567 	.probe		= corgi_lcd_probe,
568 	.remove		= corgi_lcd_remove,
569 };
570 
571 module_spi_driver(corgi_lcd_driver);
572 
573 MODULE_DESCRIPTION("LCD and backlight driver for SHARP C7x0/Cxx00");
574 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
575 MODULE_LICENSE("GPL");
576 MODULE_ALIAS("spi:corgi-lcd");
577