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 | |
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, txbuf: buf, n_tx: 2, NULL, n_rx: 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, txbuf: reg, n_tx: reg_size, rxbuf: val, n_rx: 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(sdev: 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(dev: &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(ptr: regmap)) { |
70 | dev_err(&spi->dev, "failed to allocate register map\n" ); |
71 | return PTR_ERR(ptr: regmap); |
72 | } |
73 | |
74 | return bmp280_common_probe(dev: &spi->dev, |
75 | regmap, |
76 | chip_info, |
77 | name: id->name, |
78 | irq: 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 | |