tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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(®cfg, &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, ®cfg);
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);