1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2000-2008, Willy Tarreau <w@1wt.eu>
6  * Copyright (C) 2016-2017 Glider bvba
43 	struct hd44780_common *hdc = lcd->drvdata;  in hd44780_backlight()
44 	struct hd44780 *hd = hdc->hd44780;  in hd44780_backlight()
46 	if (hd->pins[PIN_CTRL_BL])  in hd44780_backlight()
47 		gpiod_set_value_cansleep(hd->pins[PIN_CTRL_BL], on);  in hd44780_backlight()
55 	gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 1);  in hd44780_strobe_gpio()
60 	gpiod_set_value_cansleep(hd->pins[PIN_CTRL_E], 0);  in hd44780_strobe_gpio()
66 	DECLARE_BITMAP(values, 10); /* for DATA[0-7], RS, RW */  in hd44780_write_gpio8()
71 	n = hd->pins[PIN_CTRL_RW] ? 10 : 9;  in hd44780_write_gpio8()
74 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA0], NULL, values);  in hd44780_write_gpio8()
82 	DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */  in hd44780_write_gpio4()
88 	n = hd->pins[PIN_CTRL_RW] ? 6 : 5;  in hd44780_write_gpio4()
91 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);  in hd44780_write_gpio4()
100 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);  in hd44780_write_gpio4()
108 	struct hd44780 *hd = hdc->hd44780;  in hd44780_write_cmd_gpio8()
119 	struct hd44780 *hd = hdc->hd44780;  in hd44780_write_data_gpio8()
123 	/* The shortest data takes at least 45 us */  in hd44780_write_data_gpio8()
124 	udelay(45);  in hd44780_write_data_gpio8()
147 	struct hd44780 *hd = hdc->hd44780;  in hd44780_write_cmd_gpio4()
155 /* Send 4-bits of a command to the LCD panel in raw 4 bit GPIO mode */
158 	DECLARE_BITMAP(values, 6); /* for DATA[4-7], RS, RW */  in hd44780_write_cmd_raw_gpio4()
159 	struct hd44780 *hd = hdc->hd44780;  in hd44780_write_cmd_raw_gpio4()
164 	n = hd->pins[PIN_CTRL_RW] ? 6 : 5;  in hd44780_write_cmd_raw_gpio4()
167 	gpiod_set_array_value_cansleep(n, &hd->pins[PIN_DATA4], NULL, values);  in hd44780_write_cmd_raw_gpio4()
175 	struct hd44780 *hd = hdc->hd44780;  in hd44780_write_data_gpio4()
179 	/* The shortest data takes at least 45 us */  in hd44780_write_data_gpio4()
180 	udelay(45);  in hd44780_write_data_gpio4()
202 	struct device *dev = &pdev->dev;  in hd44780_probe()
207 	int ifwidth, ret = -ENOMEM;  in hd44780_probe()
222 		return -EINVAL;  in hd44780_probe()
227 		return -ENOMEM;  in hd44780_probe()
237 	hdc->hd44780 = hd;  in hd44780_probe()
238 	lcd->drvdata = hdc;  in hd44780_probe()
240 		hd->pins[base + i] = devm_gpiod_get_index(dev, "data", i,  in hd44780_probe()
242 		if (IS_ERR(hd->pins[base + i])) {  in hd44780_probe()
243 			ret = PTR_ERR(hd->pins[base + i]);  in hd44780_probe()
248 	hd->pins[PIN_CTRL_E] = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in hd44780_probe()
249 	if (IS_ERR(hd->pins[PIN_CTRL_E])) {  in hd44780_probe()
250 		ret = PTR_ERR(hd->pins[PIN_CTRL_E]);  in hd44780_probe()
254 	hd->pins[PIN_CTRL_RS] = devm_gpiod_get(dev, "rs", GPIOD_OUT_HIGH);  in hd44780_probe()
255 	if (IS_ERR(hd->pins[PIN_CTRL_RS])) {  in hd44780_probe()
256 		ret = PTR_ERR(hd->pins[PIN_CTRL_RS]);  in hd44780_probe()
261 	hd->pins[PIN_CTRL_RW] = devm_gpiod_get_optional(dev, "rw",  in hd44780_probe()
263 	if (IS_ERR(hd->pins[PIN_CTRL_RW])) {  in hd44780_probe()
264 		ret = PTR_ERR(hd->pins[PIN_CTRL_RW]);  in hd44780_probe()
268 	hd->pins[PIN_CTRL_BL] = devm_gpiod_get_optional(dev, "backlight",  in hd44780_probe()
270 	if (IS_ERR(hd->pins[PIN_CTRL_BL])) {  in hd44780_probe()
271 		ret = PTR_ERR(hd->pins[PIN_CTRL_BL]);  in hd44780_probe()
276 	ret = device_property_read_u32(dev, "display-height-chars",  in hd44780_probe()
277 				       &lcd->height);  in hd44780_probe()
280 	ret = device_property_read_u32(dev, "display-width-chars", &lcd->width);  in hd44780_probe()
288 	if (lcd->height > 2)  in hd44780_probe()
289 		hdc->bwidth = lcd->width;  in hd44780_probe()
292 	device_property_read_u32(dev, "internal-buffer-width", &hdc->bwidth);  in hd44780_probe()
294 	hdc->ifwidth = ifwidth;  in hd44780_probe()
296 		lcd->ops = &hd44780_ops_gpio8;  in hd44780_probe()
297 		hdc->write_data = hd44780_write_data_gpio8;  in hd44780_probe()
298 		hdc->write_cmd = hd44780_write_cmd_gpio8;  in hd44780_probe()
300 		lcd->ops = &hd44780_ops_gpio4;  in hd44780_probe()
301 		hdc->write_data = hd44780_write_data_gpio4;  in hd44780_probe()
302 		hdc->write_cmd = hd44780_write_cmd_gpio4;  in hd44780_probe()
303 		hdc->write_cmd_raw4 = hd44780_write_cmd_raw_gpio4;  in hd44780_probe()
325 	struct hd44780_common *hdc = lcd->drvdata;  in hd44780_remove()
328 	kfree(hdc->hd44780);  in hd44780_remove()
329 	kfree(lcd->drvdata);  in hd44780_remove()
351 MODULE_AUTHOR("Geert Uytterhoeven <geert@linux-m68k.org>");