video/backlight/ili922x.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
7  * controller. The interface to the display is SPI and the display's
20 #include <linux/spi/spi.h>
89  *   ----------------------------------
91  *   ----------------------------------
94  *	  - START_RS_INDEX	set the index register
95  *	  - START_RS_REG	write/read registers/GRAM
97  *	 - START_RW_WRITE	write
98  *	 - START_RW_READ	read
104  * CHECK_FREQ_REG(spi_device s, spi_transfer x) - Check the frequency
105  *	for the SPI transfer. According to the datasheet, the controller
110  * @s: pointer to an SPI device
115 		if (s->max_speed_hz > ILITEK_MAX_FREQ_REG)	\
116 			((struct spi_transfer *)x)->speed_hz =	\
127  * ili922x_id - id as set by manufacturer
139 	struct spi_device *spi;  member
145  * ili922x_read_status - read status register from display
146  * @spi: spi device
149 static int ili922x_read_status(struct spi_device *spi, u16 *rs)  in ili922x_read_status()  argument
162 	CHECK_FREQ_REG(spi, &xfer);  in ili922x_read_status()
167 	 * we need 4-byte xfer here due to invalid dummy byte  in ili922x_read_status()
176 	ret = spi_sync(spi, &msg);  in ili922x_read_status()
178 		dev_dbg(&spi->dev, "Error sending SPI message 0x%x", ret);  in ili922x_read_status()
187  * ili922x_read - read register from display
188  * @spi: spi device
192 static int ili922x_read(struct spi_device *spi, u8 reg, u16 *rx)  in ili922x_read()  argument
206 	CHECK_FREQ_REG(spi, &xfer_regindex);  in ili922x_read()
227 	CHECK_FREQ_REG(spi, &xfer_regvalue);  in ili922x_read()
230 	ret = spi_sync(spi, &msg);  in ili922x_read()
232 		dev_dbg(&spi->dev, "Error sending SPI message 0x%x", ret);  in ili922x_read()
241  * ili922x_write - write a controller register
242  * @spi: struct spi_device *
246 static int ili922x_write(struct spi_device *spi, u8 reg, u16 value)  in ili922x_write()  argument
261 	CHECK_FREQ_REG(spi, &xfer_regindex);  in ili922x_write()
271 	ret = spi_sync(spi, &msg);  in ili922x_write()
273 		dev_err(&spi->dev, "Error sending SPI message 0x%x", ret);  in ili922x_write()
287 	CHECK_FREQ_REG(spi, &xfer_regvalue);  in ili922x_write()
291 	ret = spi_sync(spi, &msg);  in ili922x_write()
293 		dev_err(&spi->dev, "Error sending SPI message 0x%x", ret);  in ili922x_write()
301  * ili922x_reg_dump - dump all registers
303  * @spi: pointer to an SPI device
305 static void ili922x_reg_dump(struct spi_device *spi)  in ili922x_reg_dump()  argument
310 	dev_dbg(&spi->dev, "ILI922x configuration registers:\n");  in ili922x_reg_dump()
313 		ili922x_read(spi, reg, &rx);  in ili922x_reg_dump()
314 		dev_dbg(&spi->dev, "reg @ 0x%02X: 0x%04X\n", reg, rx);  in ili922x_reg_dump()
318 static inline void ili922x_reg_dump(struct spi_device *spi) {}  in ili922x_reg_dump()  argument
322  * set_write_to_gram_reg - initialize the display to write the GRAM
323  * @spi: spi device
325 static void set_write_to_gram_reg(struct spi_device *spi)  in set_write_to_gram_reg()  argument
345 	spi_sync(spi, &msg);  in set_write_to_gram_reg()
349  * ili922x_poweron - turn the display on
350  * @spi: spi device
356 static int ili922x_poweron(struct spi_device *spi)  in ili922x_poweron()  argument
361 	ret = ili922x_write(spi, REG_POWER_CONTROL_1, 0x0000);  in ili922x_poweron()
363 	ret += ili922x_write(spi, REG_POWER_CONTROL_2, 0x0000);  in ili922x_poweron()
364 	ret += ili922x_write(spi, REG_POWER_CONTROL_3, 0x0000);  in ili922x_poweron()
366 	ret += ili922x_write(spi, REG_POWER_CONTROL_4, 0x0000);  in ili922x_poweron()
369 	ret += ili922x_write(spi, 0x56, 0x080F);  in ili922x_poweron()
370 	ret += ili922x_write(spi, REG_POWER_CONTROL_1, 0x4240);  in ili922x_poweron()
372 	ret += ili922x_write(spi, REG_POWER_CONTROL_2, 0x0000);  in ili922x_poweron()
373 	ret += ili922x_write(spi, REG_POWER_CONTROL_3, 0x0014);  in ili922x_poweron()
375 	ret += ili922x_write(spi, REG_POWER_CONTROL_4, 0x1319);  in ili922x_poweron()
382  * ili922x_poweroff - turn the display off
383  * @spi: spi device
385 static int ili922x_poweroff(struct spi_device *spi)  in ili922x_poweroff()  argument
390 	ret = ili922x_write(spi, REG_POWER_CONTROL_1, 0x0000);  in ili922x_poweroff()
392 	ret += ili922x_write(spi, REG_POWER_CONTROL_2, 0x0000);  in ili922x_poweroff()
393 	ret += ili922x_write(spi, REG_POWER_CONTROL_3, 0x0000);  in ili922x_poweroff()
395 	ret += ili922x_write(spi, REG_POWER_CONTROL_4, 0x0000);  in ili922x_poweroff()
402  * ili922x_display_init - initialize the display by setting
404  * @spi: spi device
406 static void ili922x_display_init(struct spi_device *spi)  in ili922x_display_init()  argument
408 	ili922x_write(spi, REG_START_OSCILLATION, 1);  in ili922x_display_init()
410 	ili922x_write(spi, REG_DRIVER_OUTPUT_CONTROL, 0x691B);  in ili922x_display_init()
411 	ili922x_write(spi, REG_LCD_AC_DRIVEING_CONTROL, 0x0700);  in ili922x_display_init()
412 	ili922x_write(spi, REG_ENTRY_MODE, 0x1030);  in ili922x_display_init()
413 	ili922x_write(spi, REG_COMPARE_1, 0x0000);  in ili922x_display_init()
414 	ili922x_write(spi, REG_COMPARE_2, 0x0000);  in ili922x_display_init()
415 	ili922x_write(spi, REG_DISPLAY_CONTROL_1, 0x0037);  in ili922x_display_init()
416 	ili922x_write(spi, REG_DISPLAY_CONTROL_2, 0x0202);  in ili922x_display_init()
417 	ili922x_write(spi, REG_DISPLAY_CONTROL_3, 0x0000);  in ili922x_display_init()
418 	ili922x_write(spi, REG_FRAME_CYCLE_CONTROL, 0x0000);  in ili922x_display_init()
421 	ili922x_write(spi, REG_EXT_INTF_CONTROL, 0x0110);  in ili922x_display_init()
423 	ili922x_poweron(spi);  in ili922x_display_init()
425 	ili922x_write(spi, REG_GAMMA_CONTROL_1, 0x0302);  in ili922x_display_init()
426 	ili922x_write(spi, REG_GAMMA_CONTROL_2, 0x0407);  in ili922x_display_init()
427 	ili922x_write(spi, REG_GAMMA_CONTROL_3, 0x0304);  in ili922x_display_init()
428 	ili922x_write(spi, REG_GAMMA_CONTROL_4, 0x0203);  in ili922x_display_init()
429 	ili922x_write(spi, REG_GAMMA_CONTROL_5, 0x0706);  in ili922x_display_init()
430 	ili922x_write(spi, REG_GAMMA_CONTROL_6, 0x0407);  in ili922x_display_init()
431 	ili922x_write(spi, REG_GAMMA_CONTROL_7, 0x0706);  in ili922x_display_init()
432 	ili922x_write(spi, REG_GAMMA_CONTROL_8, 0x0000);  in ili922x_display_init()
433 	ili922x_write(spi, REG_GAMMA_CONTROL_9, 0x0C06);  in ili922x_display_init()
434 	ili922x_write(spi, REG_GAMMA_CONTROL_10, 0x0F00);  in ili922x_display_init()
435 	ili922x_write(spi, REG_RAM_ADDRESS_SET, 0x0000);  in ili922x_display_init()
436 	ili922x_write(spi, REG_GATE_SCAN_CONTROL, 0x0000);  in ili922x_display_init()
437 	ili922x_write(spi, REG_VERT_SCROLL_CONTROL, 0x0000);  in ili922x_display_init()
438 	ili922x_write(spi, REG_FIRST_SCREEN_DRIVE_POS, 0xDB00);  in ili922x_display_init()
439 	ili922x_write(spi, REG_SECOND_SCREEN_DRIVE_POS, 0xDB00);  in ili922x_display_init()
440 	ili922x_write(spi, REG_RAM_ADDR_POS_H, 0xAF00);  in ili922x_display_init()
441 	ili922x_write(spi, REG_RAM_ADDR_POS_V, 0xDB00);  in ili922x_display_init()
442 	ili922x_reg_dump(spi);  in ili922x_display_init()
443 	set_write_to_gram_reg(spi);  in ili922x_display_init()
450 	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->power))  in ili922x_lcd_power()
451 		ret = ili922x_poweron(lcd->spi);  in ili922x_lcd_power()
452 	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->power))  in ili922x_lcd_power()
453 		ret = ili922x_poweroff(lcd->spi);  in ili922x_lcd_power()
456 		lcd->power = power;  in ili922x_lcd_power()
472 	return ili->power;  in ili922x_get_power()
480 static int ili922x_probe(struct spi_device *spi)  in ili922x_probe()  argument
487 	ili = devm_kzalloc(&spi->dev, sizeof(*ili), GFP_KERNEL);  in ili922x_probe()
489 		return -ENOMEM;  in ili922x_probe()
491 	ili->spi = spi;  in ili922x_probe()
492 	spi_set_drvdata(spi, ili);  in ili922x_probe()
495 	ret = ili922x_read(spi, REG_DRIVER_CODE_READ, &reg);  in ili922x_probe()
497 		dev_err(&spi->dev,  in ili922x_probe()
500 		return -ENODEV;  in ili922x_probe()
503 	dev_info(&spi->dev, "ILI%x found, SPI freq %d, mode %d\n",  in ili922x_probe()
504 		 reg, spi->max_speed_hz, spi->mode);  in ili922x_probe()
506 	ret = ili922x_read_status(spi, &reg);  in ili922x_probe()
508 		dev_err(&spi->dev, "reading RS failed...\n");  in ili922x_probe()
512 	dev_dbg(&spi->dev, "status: 0x%x\n", reg);  in ili922x_probe()
514 	ili922x_display_init(spi);  in ili922x_probe()
516 	ili->power = FB_BLANK_POWERDOWN;  in ili922x_probe()
518 	lcd = devm_lcd_device_register(&spi->dev, "ili922xlcd", &spi->dev, ili,  in ili922x_probe()
521 		dev_err(&spi->dev, "cannot register LCD\n");  in ili922x_probe()
525 	ili->ld = lcd;  in ili922x_probe()
526 	spi_set_drvdata(spi, ili);  in ili922x_probe()
533 static void ili922x_remove(struct spi_device *spi)  in ili922x_remove()  argument
535 	ili922x_poweroff(spi);  in ili922x_remove()