drm/solomon/ssd130x-spi.c

1 // SPDX-License-Identifier: GPL-2.0-only
13 #define DRIVER_NAME	"ssd130x-spi"
23  * but toggling the Data/Command control pin (D/C#). Since for 4-wire SPI
24  * a D/C# pin is used, in contrast with I2C where a control byte is sent,
34 	struct spi_device *spi = t->spi;  in ssd130x_spi_write()
38 		gpiod_set_value_cansleep(t->dc, 0);  in ssd130x_spi_write()
41 		gpiod_set_value_cansleep(t->dc, 1);  in ssd130x_spi_write()
43 	/* Remove control byte since is not used in a 4-wire SPI interface */  in ssd130x_spi_write()
44 	return spi_write(spi, reg + 1, count - 1);  in ssd130x_spi_write()
51 	return -EOPNOTSUPP;  in ssd130x_spi_read()
68 	struct device *dev = &spi->dev;  in ssd130x_spi_probe()
77 		return dev_err_probe(dev, -ENOMEM,  in ssd130x_spi_probe()
80 	t->spi = spi;  in ssd130x_spi_probe()
81 	t->dc = dc;  in ssd130x_spi_probe()
158  * auto loaded, unless it contains an alias that matches the MODALIAS reported.