1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
6  * Copyright (C) 2016-2017 Glider bvba
42 	struct hd44780 *hd = lcd->drvdata;  in hd44780_backlight()
44 	if (hd->pins[PIN_CTRL_BL])  in hd44780_backlight()
45 		gpiod_set_value_cansleep(hd->pins[PIN_CTRL_BL], on);  in hd44780_backlight()
53 	gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 1);  in hd44780_strobe_gpio()
58 	gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 0);  in hd44780_strobe_gpio()
64 	DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */  in hd44780_write_gpio8()
69 	n = hd->pins[PIN_CTRL_RW] ? 10 : 9;  in hd44780_write_gpio8()
72 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);  in hd44780_write_gpio8()
80 	DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */  in hd44780_write_gpio4()
86 	n = hd->pins[PIN_CTRL_RW] ? 6 : 5;  in hd44780_write_gpio4()
89 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);  in hd44780_write_gpio4()
98 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);  in hd44780_write_gpio4()
106 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_cmd_gpio8()
117 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_data_gpio8()
134 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_cmd_gpio4()
142 /* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
145 	DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */  in hd44780_write_cmd_raw_gpio4()
146 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_cmd_raw_gpio4()
151 	n = hd->pins[PIN_CTRL_RW] ? 6 : 5;  in hd44780_write_cmd_raw_gpio4()
154 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);  in hd44780_write_cmd_raw_gpio4()
162 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_data_gpio4()
179 	struct device *dev = &pdev->dev;  in hd44780_probe()
198 		return -EINVAL;  in hd44780_probe()
203 		return -ENOMEM;  in hd44780_probe()
205 	hd = lcd->drvdata;  in hd44780_probe()
208 		hd->pins[base + i] = devm_gpiod_get_index(dev, "data", i,  in hd44780_probe()
210 		if (IS_ERR(hd->pins[base + i])) {  in hd44780_probe()
211 			ret = PTR_ERR(hd->pins[base + i]);  in hd44780_probe()
216 	hd->pins[PIN_CTRL_E] = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in hd44780_probe()
217 	if (IS_ERR(hd->pins[PIN_CTRL_E])) {  in hd44780_probe()
218 		ret = PTR_ERR(hd->pins[PIN_CTRL_E]);  in hd44780_probe()
222 	hd->pins[PIN_CTRL_RS] = devm_gpiod_get(dev, "rs", GPIOD_OUT_HIGH);  in hd44780_probe()
223 	if (IS_ERR(hd->pins[PIN_CTRL_RS])) {  in hd44780_probe()
224 		ret = PTR_ERR(hd->pins[PIN_CTRL_RS]);  in hd44780_probe()
229 	hd->pins[PIN_CTRL_RW] = devm_gpiod_get_optional(dev, "rw",  in hd44780_probe()
231 	if (IS_ERR(hd->pins[PIN_CTRL_RW])) {  in hd44780_probe()
232 		ret = PTR_ERR(hd->pins[PIN_CTRL_RW]);  in hd44780_probe()
236 	hd->pins[PIN_CTRL_BL] = devm_gpiod_get_optional(dev, "backlight",  in hd44780_probe()
238 	if (IS_ERR(hd->pins[PIN_CTRL_BL])) {  in hd44780_probe()
239 		ret = PTR_ERR(hd->pins[PIN_CTRL_BL]);  in hd44780_probe()
244 	ret = device_property_read_u32(dev, "display-height-chars",  in hd44780_probe()
245 				       &lcd->height);  in hd44780_probe()
248 	ret = device_property_read_u32(dev, "display-width-chars", &lcd->width);  in hd44780_probe()
253 	 * On displays with more than two rows, the internal buffer width is  in hd44780_probe()
254 	 * usually equal to the display width  in hd44780_probe()
256 	if (lcd->height > 2)  in hd44780_probe()
257 		lcd->bwidth = lcd->width;  in hd44780_probe()
260 	device_property_read_u32(dev, "internal-buffer-width", &lcd->bwidth);  in hd44780_probe()
262 	lcd->ifwidth = ifwidth;  in hd44780_probe()
263 	lcd->ops = ifwidth == 8 ? &hd44780_ops_gpio8 : &hd44780_ops_gpio4;  in hd44780_probe()
304 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");