1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * SPI interface for the BMP280 driver
4 *
5 * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c
6 */
7 #include <linux/module.h>
8 #include <linux/spi/spi.h>
9 #include <linux/err.h>
10 #include <linux/regmap.h>
11
12 #include "bmp280.h"
13
bmp280_regmap_spi_write(void * context,const void * data,size_t count)14 static int bmp280_regmap_spi_write(void *context, const void *data,
15 size_t count)
16 {
17 struct device *dev = context;
18 struct spi_device *spi = to_spi_device(dev);
19 u8 buf[2];
20
21 memcpy(buf, data, 2);
22 /*
23 * The SPI register address (= full register address without bit 7) and
24 * the write command (bit7 = RW = '0')
25 */
26 buf[0] &= ~0x80;
27
28 return spi_write_then_read(spi, buf, 2, NULL, 0);
29 }
30
bmp280_regmap_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)31 static int bmp280_regmap_spi_read(void *context, const void *reg,
32 size_t reg_size, void *val, size_t val_size)
33 {
34 struct device *dev = context;
35 struct spi_device *spi = to_spi_device(dev);
36
37 return spi_write_then_read(spi, reg, reg_size, val, val_size);
38 }
39
40 static struct regmap_bus bmp280_regmap_bus = {
41 .write = bmp280_regmap_spi_write,
42 .read = bmp280_regmap_spi_read,
43 .reg_format_endian_default = REGMAP_ENDIAN_BIG,
44 .val_format_endian_default = REGMAP_ENDIAN_BIG,
45 };
46
bmp280_spi_probe(struct spi_device * spi)47 static int bmp280_spi_probe(struct spi_device *spi)
48 {
49 const struct spi_device_id *id = spi_get_device_id(spi);
50 const struct bmp280_chip_info *chip_info;
51 struct regmap *regmap;
52 int ret;
53
54 spi->bits_per_word = 8;
55 ret = spi_setup(spi);
56 if (ret < 0) {
57 dev_err(&spi->dev, "spi_setup failed!\n");
58 return ret;
59 }
60
61 chip_info = device_get_match_data(&spi->dev);
62 if (!chip_info)
63 chip_info = (const struct bmp280_chip_info *) id->driver_data;
64
65 regmap = devm_regmap_init(&spi->dev,
66 &bmp280_regmap_bus,
67 &spi->dev,
68 chip_info->regmap_config);
69 if (IS_ERR(regmap)) {
70 dev_err(&spi->dev, "failed to allocate register map\n");
71 return PTR_ERR(regmap);
72 }
73
74 return bmp280_common_probe(&spi->dev,
75 regmap,
76 chip_info,
77 id->name,
78 spi->irq);
79 }
80
81 static const struct of_device_id bmp280_of_spi_match[] = {
82 { .compatible = "bosch,bmp085", .data = &bmp180_chip_info },
83 { .compatible = "bosch,bmp180", .data = &bmp180_chip_info },
84 { .compatible = "bosch,bmp181", .data = &bmp180_chip_info },
85 { .compatible = "bosch,bmp280", .data = &bmp280_chip_info },
86 { .compatible = "bosch,bme280", .data = &bmp280_chip_info },
87 { .compatible = "bosch,bmp380", .data = &bmp380_chip_info },
88 { .compatible = "bosch,bmp580", .data = &bmp580_chip_info },
89 { },
90 };
91 MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
92
93 static const struct spi_device_id bmp280_spi_id[] = {
94 { "bmp180", (kernel_ulong_t)&bmp180_chip_info },
95 { "bmp181", (kernel_ulong_t)&bmp180_chip_info },
96 { "bmp280", (kernel_ulong_t)&bmp280_chip_info },
97 { "bme280", (kernel_ulong_t)&bmp280_chip_info },
98 { "bmp380", (kernel_ulong_t)&bmp380_chip_info },
99 { "bmp580", (kernel_ulong_t)&bmp580_chip_info },
100 { }
101 };
102 MODULE_DEVICE_TABLE(spi, bmp280_spi_id);
103
104 static struct spi_driver bmp280_spi_driver = {
105 .driver = {
106 .name = "bmp280",
107 .of_match_table = bmp280_of_spi_match,
108 .pm = pm_ptr(&bmp280_dev_pm_ops),
109 },
110 .id_table = bmp280_spi_id,
111 .probe = bmp280_spi_probe,
112 };
113 module_spi_driver(bmp280_spi_driver);
114
115 MODULE_DESCRIPTION("BMP280 SPI bus driver");
116 MODULE_LICENSE("GPL");
117 MODULE_IMPORT_NS(IIO_BMP280);
118
