// 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(&regcfg, &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, &regcfg);
        }

        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           = KBUILD_MODNAME,
                .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(KBUILD_MODNAME " interface driver");
MODULE_IMPORT_NS("SERIAL_NXP_SC16IS7XX");