1// SPDX-License-Identifier: GPL-2.0+
 2/* SC16IS7xx SPI interface driver */
 3
 4#include <linux/dev_printk.h>
 5#include <linux/mod_devicetable.h>
 6#include <linux/module.h>
 7#include <linux/regmap.h>
 8#include <linux/spi/spi.h>
 9#include <linux/string.h>
10#include <linux/units.h>
11
12#include "sc16is7xx.h"
13
14/* SPI definitions */
15#define SC16IS7XX_SPI_READ_BIT	BIT(7)
16
17static int sc16is7xx_spi_probe(struct spi_device *spi)
18{
19	const struct sc16is7xx_devtype *devtype;
20	struct regmap *regmaps[SC16IS7XX_MAX_PORTS];
21	struct regmap_config regcfg;
22	unsigned int i;
23	int ret;
24
25	/* Setup SPI bus */
26	spi->bits_per_word	= 8;
27	/* For all variants, only mode 0 is supported */
28	if ((spi->mode & SPI_MODE_X_MASK) != SPI_MODE_0)
29		return dev_err_probe(&spi->dev, -EINVAL, "Unsupported SPI mode\n");
30
31	spi->mode		= spi->mode ? : SPI_MODE_0;
32	spi->max_speed_hz	= spi->max_speed_hz ? : 4 * HZ_PER_MHZ;
33	ret = spi_setup(spi);
34	if (ret)
35		return ret;
36
37	devtype = spi_get_device_match_data(spi);
38	if (!devtype)
39		return dev_err_probe(&spi->dev, -ENODEV, "Failed to match device\n");
40
41	memcpy(&regcfg, &sc16is7xx_regcfg, sizeof(struct regmap_config));
42
43	for (i = 0; i < devtype->nr_uart; i++) {
44		regcfg.name = sc16is7xx_regmap_name(i);
45		/*
46		 * If read_flag_mask is 0, the regmap code sets it to a default
47		 * of 0x80. Since we specify our own mask, we must add the READ
48		 * bit ourselves:
49		 */
50		regcfg.read_flag_mask = sc16is7xx_regmap_port_mask(i) |
51			SC16IS7XX_SPI_READ_BIT;
52		regcfg.write_flag_mask = sc16is7xx_regmap_port_mask(i);
53		regmaps[i] = devm_regmap_init_spi(spi, &regcfg);
54	}
55
56	return sc16is7xx_probe(&spi->dev, devtype, regmaps, spi->irq);
57}
58
59static void sc16is7xx_spi_remove(struct spi_device *spi)
60{
61	sc16is7xx_remove(&spi->dev);
62}
63
64static const struct spi_device_id sc16is7xx_spi_id_table[] = {
65	{ "sc16is74x",	(kernel_ulong_t)&sc16is74x_devtype, },
66	{ "sc16is740",	(kernel_ulong_t)&sc16is74x_devtype, },
67	{ "sc16is741",	(kernel_ulong_t)&sc16is74x_devtype, },
68	{ "sc16is750",	(kernel_ulong_t)&sc16is750_devtype, },
69	{ "sc16is752",	(kernel_ulong_t)&sc16is752_devtype, },
70	{ "sc16is760",	(kernel_ulong_t)&sc16is760_devtype, },
71	{ "sc16is762",	(kernel_ulong_t)&sc16is762_devtype, },
72	{ }
73};
74MODULE_DEVICE_TABLE(spi, sc16is7xx_spi_id_table);
75
76static struct spi_driver sc16is7xx_spi_driver = {
77	.driver = {
78		.name		= SC16IS7XX_NAME,
79		.of_match_table	= sc16is7xx_dt_ids,
80	},
81	.probe		= sc16is7xx_spi_probe,
82	.remove		= sc16is7xx_spi_remove,
83	.id_table	= sc16is7xx_spi_id_table,
84};
85
86module_spi_driver(sc16is7xx_spi_driver);
87
88MODULE_LICENSE("GPL");
89MODULE_DESCRIPTION("SC16IS7xx SPI interface driver");
90MODULE_IMPORT_NS("SERIAL_NXP_SC16IS7XX");