3  * HD44780 Character LCD driver for Linux
40 static void hd44780_backlight(struct charlcd *lcd, int on)  in hd44780_backlight()  argument
42 	struct hd44780 *hd = lcd->drvdata;  in hd44780_backlight()
61 /* write to an LCD panel register in 8 bit GPIO mode */
77 /* write to an LCD panel register in 4 bit GPIO mode */
103 /* Send a command to the LCD panel in 8 bit GPIO mode */
104 static void hd44780_write_cmd_gpio8(struct charlcd *lcd, int cmd)  in hd44780_write_cmd_gpio8()  argument
106 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_cmd_gpio8()
114 /* Send data to the LCD panel in 8 bit GPIO mode */
115 static void hd44780_write_data_gpio8(struct charlcd *lcd, int data)  in hd44780_write_data_gpio8()  argument
117 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_data_gpio8()
131 /* Send a command to the LCD panel in 4 bit GPIO mode */
132 static void hd44780_write_cmd_gpio4(struct charlcd *lcd, int cmd)  in hd44780_write_cmd_gpio4()  argument
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 */
143 static void hd44780_write_cmd_raw_gpio4(struct charlcd *lcd, int cmd)  in hd44780_write_cmd_raw_gpio4()  argument
146 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_cmd_raw_gpio4()
159 /* Send data to the LCD panel in 4 bit GPIO mode */
160 static void hd44780_write_data_gpio4(struct charlcd *lcd, int data)  in hd44780_write_data_gpio4()  argument
162 	struct hd44780 *hd = lcd->drvdata;  in hd44780_write_data_gpio4()
181 	struct charlcd *lcd;  in hd44780_probe()  local
201 	lcd = charlcd_alloc(sizeof(struct hd44780));  in hd44780_probe()
202 	if (!lcd)  in hd44780_probe()
205 	hd = lcd->drvdata;  in hd44780_probe()
245 				       &lcd->height);  in hd44780_probe()
248 	ret = device_property_read_u32(dev, "display-width-chars", &lcd->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()
265 	ret = charlcd_register(lcd);  in hd44780_probe()
269 	platform_set_drvdata(pdev, lcd);  in hd44780_probe()
273 	charlcd_free(lcd);  in hd44780_probe()
279 	struct charlcd *lcd = platform_get_drvdata(pdev);  in hd44780_remove()  local
281 	charlcd_unregister(lcd);  in hd44780_remove()
283 	charlcd_free(lcd);  in hd44780_remove()
303 MODULE_DESCRIPTION("HD44780 Character LCD driver");