text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * lms283gf05.c -- support for Samsung LMS283GF05 LCD
   *
   * Copyright (c) 2009 Marek Vasut <marek.vasut@gmail.com>
   */
  
  #include <linux/device.h>
  #include <linux/kernel.h>
  #include <linux/delay.h>
  #include <linux/slab.h>
  #include <linux/gpio.h>
  #include <linux/lcd.h>
  
  #include <linux/spi/spi.h>
  #include <linux/spi/lms283gf05.h>
  #include <linux/module.h>
  
  struct lms283gf05_state {
  	struct spi_device	*spi;
  	struct lcd_device	*ld;
  };
  
  struct lms283gf05_seq {
  	unsigned char		reg;
  	unsigned short		value;
  	unsigned char		delay;
  };
  
  /* Magic sequences supplied by manufacturer, for details refer to datasheet */
  static const struct lms283gf05_seq disp_initseq[] = {
  	/* REG, VALUE, DELAY */
  	{ 0x07, 0x0000, 0 },
  	{ 0x13, 0x0000, 10 },
  
  	{ 0x11, 0x3004, 0 },
  	{ 0x14, 0x200F, 0 },
  	{ 0x10, 0x1a20, 0 },
  	{ 0x13, 0x0040, 50 },
  
  	{ 0x13, 0x0060, 0 },
  	{ 0x13, 0x0070, 200 },
  
  	{ 0x01, 0x0127, 0 },
  	{ 0x02,	0x0700, 0 },
  	{ 0x03, 0x1030, 0 },
  	{ 0x08, 0x0208, 0 },
  	{ 0x0B, 0x0620, 0 },
  	{ 0x0C, 0x0110, 0 },
  	{ 0x30, 0x0120, 0 },
  	{ 0x31, 0x0127, 0 },
  	{ 0x32, 0x0000, 0 },
  	{ 0x33, 0x0503, 0 },
  	{ 0x34, 0x0727, 0 },
  	{ 0x35, 0x0124, 0 },
  	{ 0x36, 0x0706, 0 },
  	{ 0x37, 0x0701, 0 },
  	{ 0x38, 0x0F00, 0 },
  	{ 0x39, 0x0F00, 0 },
  	{ 0x40, 0x0000, 0 },
  	{ 0x41, 0x0000, 0 },
  	{ 0x42, 0x013f, 0 },
  	{ 0x43, 0x0000, 0 },
  	{ 0x44, 0x013f, 0 },
  	{ 0x45, 0x0000, 0 },
  	{ 0x46, 0xef00, 0 },
  	{ 0x47, 0x013f, 0 },
  	{ 0x48, 0x0000, 0 },
  	{ 0x07, 0x0015, 30 },
  
  	{ 0x07, 0x0017, 0 },
  
  	{ 0x20, 0x0000, 0 },
  	{ 0x21, 0x0000, 0 },
  	{ 0x22, 0x0000, 0 }
  };
  
  static const struct lms283gf05_seq disp_pdwnseq[] = {
  	{ 0x07, 0x0016, 30 },
  
  	{ 0x07, 0x0004, 0 },
  	{ 0x10, 0x0220, 20 },
  
  	{ 0x13, 0x0060, 50 },
  
  	{ 0x13, 0x0040, 50 },
  
  	{ 0x13, 0x0000, 0 },
  	{ 0x10, 0x0000, 0 }
  };
  
  
  static void lms283gf05_reset(unsigned long gpio, bool inverted)
  {
  	gpio_set_value(gpio, !inverted);
  	mdelay(100);
  	gpio_set_value(gpio, inverted);
  	mdelay(20);
  	gpio_set_value(gpio, !inverted);
  	mdelay(20);
  }
  
  static void lms283gf05_toggle(struct spi_device *spi,
  				const struct lms283gf05_seq *seq, int sz)
  {
  	char buf[3];
  	int i;
  
  	for (i = 0; i < sz; i++) {
  		buf[0] = 0x74;
  		buf[1] = 0x00;
  		buf[2] = seq[i].reg;
  		spi_write(spi, buf, 3);
  
  		buf[0] = 0x76;
  		buf[1] = seq[i].value >> 8;
  		buf[2] = seq[i].value & 0xff;
  		spi_write(spi, buf, 3);
  
  		mdelay(seq[i].delay);
  	}
  }
  
  static int lms283gf05_power_set(struct lcd_device *ld, int power)
  {
  	struct lms283gf05_state *st = lcd_get_data(ld);
  	struct spi_device *spi = st->spi;
  	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
  
  	if (power <= FB_BLANK_NORMAL) {
  		if (pdata)
  			lms283gf05_reset(pdata->reset_gpio,
  					pdata->reset_inverted);
  		lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
  	} else {
  		lms283gf05_toggle(spi, disp_pdwnseq, ARRAY_SIZE(disp_pdwnseq));
  		if (pdata)
  			gpio_set_value(pdata->reset_gpio,
  					pdata->reset_inverted);
  	}
  
  	return 0;
  }
  
  static struct lcd_ops lms_ops = {
  	.set_power	= lms283gf05_power_set,
  	.get_power	= NULL,
  };
  
  static int lms283gf05_probe(struct spi_device *spi)
  {
  	struct lms283gf05_state *st;
  	struct lms283gf05_pdata *pdata = dev_get_platdata(&spi->dev);
  	struct lcd_device *ld;
  	int ret = 0;
  
  	if (pdata != NULL) {
  		ret = devm_gpio_request_one(&spi->dev, pdata->reset_gpio,
  				GPIOF_DIR_OUT | (!pdata->reset_inverted ?
  				GPIOF_INIT_HIGH : GPIOF_INIT_LOW),
  				"LMS285GF05 RESET");
  		if (ret)
  			return ret;
  	}
  
  	st = devm_kzalloc(&spi->dev, sizeof(struct lms283gf05_state),
  				GFP_KERNEL);
  	if (st == NULL)
  		return -ENOMEM;
  
  	ld = devm_lcd_device_register(&spi->dev, "lms283gf05", &spi->dev, st,
  					&lms_ops);
  	if (IS_ERR(ld))
  		return PTR_ERR(ld);
  
  	st->spi = spi;
  	st->ld = ld;
  
  	spi_set_drvdata(spi, st);
  
  	/* kick in the LCD */
  	if (pdata)
  		lms283gf05_reset(pdata->reset_gpio, pdata->reset_inverted);
  	lms283gf05_toggle(spi, disp_initseq, ARRAY_SIZE(disp_initseq));
  
  	return 0;
  }
  
  static struct spi_driver lms283gf05_driver = {
  	.driver = {
  		.name	= "lms283gf05",
  	},
  	.probe		= lms283gf05_probe,
  };
  
  module_spi_driver(lms283gf05_driver);
  
  MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
  MODULE_DESCRIPTION("LCD283GF05 LCD");
  MODULE_LICENSE("GPL v2");
  