1 // SPDX-License-Identifier: GPL-2.0-only
3  * DRM driver for Solomon SSD13xx OLED displays (SPI bus)
8 #include <linux/spi/spi.h>
13 #define DRIVER_NAME	"ssd130x-spi"
14 #define DRIVER_DESC	"DRM driver for Solomon SSD13xx OLED displays (SPI)"
17 	struct spi_device *spi;  member
23  * but toggling the Data/Command control pin (D/C#). Since for 4-wire SPI
28  * and can be used by the ssd130x SPI driver to determine if the data sent
34 	struct spi_device *spi = t->spi;  in ssd130x_spi_write()  local
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()
62 static int ssd130x_spi_probe(struct spi_device *spi)  in ssd130x_spi_probe()  argument
68 	struct device *dev = &spi->dev;  in ssd130x_spi_probe()
77 		return dev_err_probe(dev, -ENOMEM,  in ssd130x_spi_probe()
78 				     "Failed to allocate SPI transport data\n");  in ssd130x_spi_probe()
80 	t->spi = spi;  in ssd130x_spi_probe()
81 	t->dc = dc;  in ssd130x_spi_probe()
91 	spi_set_drvdata(spi, ssd130x);  in ssd130x_spi_probe()
96 static void ssd130x_spi_remove(struct spi_device *spi)  in ssd130x_spi_remove()  argument
98 	struct ssd130x_device *ssd130x = spi_get_drvdata(spi);  in ssd130x_spi_remove()
103 static void ssd130x_spi_shutdown(struct spi_device *spi)  in ssd130x_spi_shutdown()  argument
105 	struct ssd130x_device *ssd130x = spi_get_drvdata(spi);  in ssd130x_spi_shutdown()
113 		.compatible = "sinowealth,sh1106",
117 		.compatible = "solomon,ssd1305",
121 		.compatible = "solomon,ssd1306",
125 		.compatible = "solomon,ssd1307",
129 		.compatible = "solomon,ssd1309",
134 		.compatible = "solomon,ssd1322",
138 		.compatible = "solomon,ssd1325",
142 		.compatible = "solomon,ssd1327",
147 		.compatible = "solomon,ssd1331",
156  * The SPI core always reports a MODALIAS uevent of the form "spi:<dev>", even
160  * To workaround this issue, add a SPI device ID table. Even when this should
161  * not be needed for this driver to match the registered SPI devices.
178 MODULE_DEVICE_TABLE(spi, ssd130x_spi_table);