drivers/auxdisplay/seg-led-gpio.c

1 // SPDX-License-Identifier: GPL-2.0
3  * Driver for a 7-segment LED display
5  * The decimal point LED present on some devices is currently not
22 #include "line-display.h"
33 	struct linedisp *linedisp = &priv->linedisp;  in seg_led_update()
34 	struct linedisp_map *map = linedisp->map;  in seg_led_update()
37 	bitmap_set_value8(values, map_to_seg7(&map->map.seg7, linedisp->buf[0]), 0);  in seg_led_update()
39 	gpiod_multi_set_value_cansleep(priv->segment_gpios, values);  in seg_led_update()
46 	INIT_DELAYED_WORK(&priv->work, seg_led_update);  in seg_led_linedisp_get_map_type()
54 	schedule_delayed_work(&priv->work, 0);  in seg_led_linedisp_update()
65 	struct device *dev = &pdev->dev;  in seg_led_probe()
69 		return -ENOMEM;  in seg_led_probe()
73 	priv->segment_gpios = devm_gpiod_get_array(dev, "segment", GPIOD_OUT_LOW);  in seg_led_probe()
74 	if (IS_ERR(priv->segment_gpios))  in seg_led_probe()
75 		return PTR_ERR(priv->segment_gpios);  in seg_led_probe()
77 	if (priv->segment_gpios->ndescs < 7 || priv->segment_gpios->ndescs > 8)  in seg_led_probe()
78 		return -EINVAL;  in seg_led_probe()
80 	return linedisp_register(&priv->linedisp, dev, 1, &seg_led_linedisp_ops);  in seg_led_probe()
87 	cancel_delayed_work_sync(&priv->work);  in seg_led_remove()
88 	linedisp_unregister(&priv->linedisp);  in seg_led_remove()
92 	{ .compatible = "gpio-7-segment"},
101 		.name = "seg-led-gpio",
108 MODULE_DESCRIPTION("7 segment LED driver");