1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for the Himax HX-8357 LCD Controller
9 #include <linux/lcd.h>
217 	struct hx8357_data *lcd = lcd_get_data(lcdev);  in hx8357_spi_write_then_read()  local
232 			return -ENOMEM;  in hx8357_spi_write_then_read()
253 	ret = spi_sync(lcd->spi, &msg);  in hx8357_spi_write_then_read()
255 		dev_err(&lcdev->dev, "Couldn't send SPI data\n");  in hx8357_spi_write_then_read()
290 	 * The controller needs 120ms when entering in sleep mode before we can  in hx8357_enter_standby()
307 	 * The controller needs 120ms when exiting from sleep mode before we  in hx8357_exit_standby()
321 	struct hx8357_data *lcd = lcd_get_data(lcdev);  in hx8357_lcd_reset()  local
324 	gpio_set_value(lcd->reset, 1);  in hx8357_lcd_reset()
326 	gpio_set_value(lcd->reset, 0);  in hx8357_lcd_reset()
328 	gpio_set_value(lcd->reset, 1);  in hx8357_lcd_reset()
330 	/* The controller needs 120ms to recover from reset */  in hx8357_lcd_reset()
336 	struct hx8357_data *lcd = lcd_get_data(lcdev);  in hx8357_lcd_init()  local
343 	if (lcd->use_im_pins) {  in hx8357_lcd_init()
344 		gpio_set_value_cansleep(lcd->im_pins[0], 1);  in hx8357_lcd_init()
345 		gpio_set_value_cansleep(lcd->im_pins[1], 0);  in hx8357_lcd_init()
346 		gpio_set_value_cansleep(lcd->im_pins[2], 1);  in hx8357_lcd_init()
429 	 * The controller needs 120ms to fully recover from exiting sleep mode  in hx8357_lcd_init()
491 	 * The controller needs 120ms to fully recover from exiting sleep mode  in hx8369_lcd_init()
540 	struct hx8357_data *lcd = lcd_get_data(lcdev);  in hx8357_set_power()  local
543 	if (POWER_IS_ON(power) && !POWER_IS_ON(lcd->state))  in hx8357_set_power()
545 	else if (!POWER_IS_ON(power) && POWER_IS_ON(lcd->state))  in hx8357_set_power()
549 		lcd->state = power;  in hx8357_set_power()
551 		dev_warn(&lcdev->dev, "failed to set power mode %d\n", power);  in hx8357_set_power()
558 	struct hx8357_data *lcd = lcd_get_data(lcdev);  in hx8357_get_power()  local
560 	return lcd->state;  in hx8357_get_power()
584 	struct hx8357_data *lcd;  in hx8357_probe()  local
588 	lcd = devm_kzalloc(&spi->dev, sizeof(*lcd), GFP_KERNEL);  in hx8357_probe()
589 	if (!lcd)  in hx8357_probe()
590 		return -ENOMEM;  in hx8357_probe()
594 		dev_err(&spi->dev, "SPI setup failed.\n");  in hx8357_probe()
598 	lcd->spi = spi;  in hx8357_probe()
600 	match = of_match_device(hx8357_dt_ids, &spi->dev);  in hx8357_probe()
601 	if (!match || !match->data)  in hx8357_probe()
602 		return -EINVAL;  in hx8357_probe()
604 	lcd->reset = of_get_named_gpio(spi->dev.of_node, "gpios-reset", 0);  in hx8357_probe()
605 	if (!gpio_is_valid(lcd->reset)) {  in hx8357_probe()
606 		dev_err(&spi->dev, "Missing dt property: gpios-reset\n");  in hx8357_probe()
607 		return -EINVAL;  in hx8357_probe()
610 	ret = devm_gpio_request_one(&spi->dev, lcd->reset,  in hx8357_probe()
612 				    "hx8357-reset");  in hx8357_probe()
614 		dev_err(&spi->dev,  in hx8357_probe()
616 			lcd->reset, ret);  in hx8357_probe()
617 		return -EINVAL;  in hx8357_probe()
620 	if (of_find_property(spi->dev.of_node, "im-gpios", NULL)) {  in hx8357_probe()
621 		lcd->use_im_pins = 1;  in hx8357_probe()
624 			lcd->im_pins[i] = of_get_named_gpio(spi->dev.of_node,  in hx8357_probe()
625 							    "im-gpios", i);  in hx8357_probe()
626 			if (lcd->im_pins[i] == -EPROBE_DEFER) {  in hx8357_probe()
627 				dev_info(&spi->dev, "GPIO requested is not here yet, deferring the probe\n");  in hx8357_probe()
628 				return -EPROBE_DEFER;  in hx8357_probe()
630 			if (!gpio_is_valid(lcd->im_pins[i])) {  in hx8357_probe()
631 				dev_err(&spi->dev, "Missing dt property: im-gpios\n");  in hx8357_probe()
632 				return -EINVAL;  in hx8357_probe()
635 			ret = devm_gpio_request_one(&spi->dev, lcd->im_pins[i],  in hx8357_probe()
639 				dev_err(&spi->dev, "failed to request gpio %d: %d\n",  in hx8357_probe()
640 					lcd->im_pins[i], ret);  in hx8357_probe()
641 				return -EINVAL;  in hx8357_probe()
645 		lcd->use_im_pins = 0;  in hx8357_probe()
648 	lcdev = devm_lcd_device_register(&spi->dev, "mxsfb", &spi->dev, lcd,  in hx8357_probe()
658 	ret = ((int (*)(struct lcd_device *))match->data)(lcdev);  in hx8357_probe()
660 		dev_err(&spi->dev, "Couldn't initialize panel\n");  in hx8357_probe()
664 	dev_info(&spi->dev, "Panel probed\n");  in hx8357_probe()
679 MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
680 MODULE_DESCRIPTION("Himax HX-8357 LCD Driver");