Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
b26b4e91 LW |
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 | ||
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 | ||
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 | ||
47 | static int bmp280_spi_probe(struct spi_device *spi) | |
48 | { | |
49 | const struct spi_device_id *id = spi_get_device_id(spi); | |
50 | struct regmap *regmap; | |
51 | const struct regmap_config *regmap_config; | |
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 | switch (id->driver_data) { | |
62 | case BMP180_CHIP_ID: | |
63 | regmap_config = &bmp180_regmap_config; | |
64 | break; | |
65 | case BMP280_CHIP_ID: | |
66 | case BME280_CHIP_ID: | |
67 | regmap_config = &bmp280_regmap_config; | |
68 | break; | |
69 | default: | |
70 | return -EINVAL; | |
71 | } | |
72 | ||
73 | regmap = devm_regmap_init(&spi->dev, | |
74 | &bmp280_regmap_bus, | |
75 | &spi->dev, | |
76 | regmap_config); | |
77 | if (IS_ERR(regmap)) { | |
78 | dev_err(&spi->dev, "failed to allocate register map\n"); | |
79 | return PTR_ERR(regmap); | |
80 | } | |
81 | ||
82 | return bmp280_common_probe(&spi->dev, | |
83 | regmap, | |
84 | id->driver_data, | |
aae95394 LW |
85 | id->name, |
86 | spi->irq); | |
b26b4e91 LW |
87 | } |
88 | ||
89 | static int bmp280_spi_remove(struct spi_device *spi) | |
90 | { | |
91 | return bmp280_common_remove(&spi->dev); | |
92 | } | |
93 | ||
94 | static const struct of_device_id bmp280_of_spi_match[] = { | |
95 | { .compatible = "bosch,bmp085", }, | |
96 | { .compatible = "bosch,bmp180", }, | |
97 | { .compatible = "bosch,bmp181", }, | |
98 | { .compatible = "bosch,bmp280", }, | |
99 | { .compatible = "bosch,bme280", }, | |
100 | { }, | |
101 | }; | |
102 | MODULE_DEVICE_TABLE(of, bmp280_of_spi_match); | |
103 | ||
104 | static const struct spi_device_id bmp280_spi_id[] = { | |
105 | { "bmp180", BMP180_CHIP_ID }, | |
106 | { "bmp181", BMP180_CHIP_ID }, | |
107 | { "bmp280", BMP280_CHIP_ID }, | |
108 | { "bme280", BME280_CHIP_ID }, | |
109 | { } | |
110 | }; | |
111 | MODULE_DEVICE_TABLE(spi, bmp280_spi_id); | |
112 | ||
113 | static struct spi_driver bmp280_spi_driver = { | |
114 | .driver = { | |
115 | .name = "bmp280", | |
116 | .of_match_table = bmp280_of_spi_match, | |
3d838118 | 117 | .pm = &bmp280_dev_pm_ops, |
b26b4e91 LW |
118 | }, |
119 | .id_table = bmp280_spi_id, | |
120 | .probe = bmp280_spi_probe, | |
121 | .remove = bmp280_spi_remove, | |
122 | }; | |
123 | module_spi_driver(bmp280_spi_driver); | |
124 | ||
125 | MODULE_DESCRIPTION("BMP280 SPI bus driver"); | |
126 | MODULE_LICENSE("GPL"); |