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// SPDX-License-Identifier: GPL-2.0+
/* SC16IS7xx SPI interface driver */
#include <linux/dev_printk.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/string.h>
#include <linux/units.h>
#include "sc16is7xx.h"
/* SPI definitions */
#define SC16IS7XX_SPI_READ_BIT BIT(7)
static int sc16is7xx_spi_probe(struct spi_device *spi)
{
const struct sc16is7xx_devtype *devtype;
struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
struct regmap_config regcfg;
unsigned int i;
int ret;
/* Setup SPI bus */
spi->bits_per_word = 8;
/* For all variants, only mode 0 is supported */
if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
spi->mode = spi->mode ? : SPI_MODE_0;
spi->max_speed_hz = spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
ret = spi_setup(spi);
if (ret)
return ret;
devtype = spi_get_device_match_data(spi);
if (!devtype)
return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
memcpy(®cfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));
for (i = 0; i < devtype->nr_uart; i++) {
regcfg.name = sc16is7xx_regmap_name(i);
/*
* If read_flag_mask is 0, the regmap code sets it to a default
* of 0x80. Since we specify our own mask, we must add the READ
* bit ourselves:
*/
regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
SC16IS7XX_SPI_READ_BIT;
regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
regmaps[i] = devm_regmap_init_spi(spi, ®cfg);
}
return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
}
static void sc16is7xx_spi_remove(struct spi_device *spi)
{
sc16is7xx_remove(&spi->dev);
}
static const struct spi_device_id sc16is7xx_spi_id_table[] = {
{ "sc16is74x", (kernel_ulong_t)&sc16is74x_devtype, },
{ "sc16is740", (kernel_ulong_t)&sc16is74x_devtype, },
{ "sc16is741", (kernel_ulong_t)&sc16is74x_devtype, },
{ "sc16is750", (kernel_ulong_t)&sc16is750_devtype, },
{ "sc16is752", (kernel_ulong_t)&sc16is752_devtype, },
{ "sc16is760", (kernel_ulong_t)&sc16is760_devtype, },
{ "sc16is762", (kernel_ulong_t)&sc16is762_devtype, },
{ }
};
MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
static struct spi_driver sc16is7xx_spi_driver = {
.driver = {
.name = SC16IS7XX_NAME,
.of_match_table = sc16is7xx_dt_ids,
},
.probe = sc16is7xx_spi_probe,
.remove = sc16is7xx_spi_remove,
.id_table = sc16is7xx_spi_id_table,
};
module_spi_driver(sc16is7xx_spi_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");
MODULE_IMPORT_NS(SERIAL_NXP_SC16IS7XX);
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