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- // SPDX-License-Identifier: GPL-2.0
- #include <linux/device.h>
- #include <linux/module.h>
- #include <linux/spi/spi.h>
- #include <linux/delay.h>
- #include <drm/drm_print.h>
- #include "panel-samsung-s6e63m0.h"
- #define DATA_MASK 0x100
- static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data)
- {
- /*
- * FIXME: implement reading DCS commands over SPI so we can
- * properly identify which physical panel is connected.
- */
- *data = 0;
- return 0;
- }
- static int s6e63m0_spi_write_word(struct device *dev, u16 data)
- {
- struct spi_device *spi = to_spi_device(dev);
- struct spi_transfer xfer = {
- .len = 2,
- .tx_buf = &data,
- };
- struct spi_message msg;
- spi_message_init(&msg);
- spi_message_add_tail(&xfer, &msg);
- return spi_sync(spi, &msg);
- }
- static int s6e63m0_spi_dcs_write(struct device *dev, const u8 *data, size_t len)
- {
- int ret = 0;
- dev_dbg(dev, "SPI writing dcs seq: %*ph\n", (int)len, data);
- ret = s6e63m0_spi_write_word(dev, *data);
- while (!ret && --len) {
- ++data;
- ret = s6e63m0_spi_write_word(dev, *data | DATA_MASK);
- }
- if (ret) {
- dev_err(dev, "SPI error %d writing dcs seq: %*ph\n", ret,
- (int)len, data);
- }
- usleep_range(300, 310);
- return ret;
- }
- static int s6e63m0_spi_probe(struct spi_device *spi)
- {
- struct device *dev = &spi->dev;
- int ret;
- spi->bits_per_word = 9;
- spi->mode = SPI_MODE_3;
- ret = spi_setup(spi);
- if (ret < 0) {
- dev_err(dev, "spi setup failed.\n");
- return ret;
- }
- return s6e63m0_probe(dev, s6e63m0_spi_dcs_read, s6e63m0_spi_dcs_write,
- false);
- }
- static int s6e63m0_spi_remove(struct spi_device *spi)
- {
- return s6e63m0_remove(&spi->dev);
- }
- static const struct of_device_id s6e63m0_spi_of_match[] = {
- { .compatible = "samsung,s6e63m0" },
- { /* sentinel */ }
- };
- MODULE_DEVICE_TABLE(of, s6e63m0_spi_of_match);
- static struct spi_driver s6e63m0_spi_driver = {
- .probe = s6e63m0_spi_probe,
- .remove = s6e63m0_spi_remove,
- .driver = {
- .name = "panel-samsung-s6e63m0",
- .of_match_table = s6e63m0_spi_of_match,
- },
- };
- module_spi_driver(s6e63m0_spi_driver);
- MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
- MODULE_DESCRIPTION("s6e63m0 LCD SPI Driver");
- MODULE_LICENSE("GPL v2");
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