1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * SPI interface for the BMP280 driver
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Inspired by the older BMP085 driver drivers/misc/bmp085-spi.c
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun #include <linux/module.h>
8*4882a593Smuzhiyun #include <linux/spi/spi.h>
9*4882a593Smuzhiyun #include <linux/err.h>
10*4882a593Smuzhiyun #include <linux/regmap.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #include "bmp280.h"
13*4882a593Smuzhiyun
bmp280_regmap_spi_write(void * context,const void * data,size_t count)14*4882a593Smuzhiyun static int bmp280_regmap_spi_write(void *context, const void *data,
15*4882a593Smuzhiyun size_t count)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun struct device *dev = context;
18*4882a593Smuzhiyun struct spi_device *spi = to_spi_device(dev);
19*4882a593Smuzhiyun u8 buf[2];
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun memcpy(buf, data, 2);
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * The SPI register address (= full register address without bit 7) and
24*4882a593Smuzhiyun * the write command (bit7 = RW = '0')
25*4882a593Smuzhiyun */
26*4882a593Smuzhiyun buf[0] &= ~0x80;
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun return spi_write_then_read(spi, buf, 2, NULL, 0);
29*4882a593Smuzhiyun }
30*4882a593Smuzhiyun
bmp280_regmap_spi_read(void * context,const void * reg,size_t reg_size,void * val,size_t val_size)31*4882a593Smuzhiyun static int bmp280_regmap_spi_read(void *context, const void *reg,
32*4882a593Smuzhiyun size_t reg_size, void *val, size_t val_size)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun struct device *dev = context;
35*4882a593Smuzhiyun struct spi_device *spi = to_spi_device(dev);
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun return spi_write_then_read(spi, reg, reg_size, val, val_size);
38*4882a593Smuzhiyun }
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun static struct regmap_bus bmp280_regmap_bus = {
41*4882a593Smuzhiyun .write = bmp280_regmap_spi_write,
42*4882a593Smuzhiyun .read = bmp280_regmap_spi_read,
43*4882a593Smuzhiyun .reg_format_endian_default = REGMAP_ENDIAN_BIG,
44*4882a593Smuzhiyun .val_format_endian_default = REGMAP_ENDIAN_BIG,
45*4882a593Smuzhiyun };
46*4882a593Smuzhiyun
bmp280_spi_probe(struct spi_device * spi)47*4882a593Smuzhiyun static int bmp280_spi_probe(struct spi_device *spi)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun const struct spi_device_id *id = spi_get_device_id(spi);
50*4882a593Smuzhiyun struct regmap *regmap;
51*4882a593Smuzhiyun const struct regmap_config *regmap_config;
52*4882a593Smuzhiyun int ret;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun spi->bits_per_word = 8;
55*4882a593Smuzhiyun ret = spi_setup(spi);
56*4882a593Smuzhiyun if (ret < 0) {
57*4882a593Smuzhiyun dev_err(&spi->dev, "spi_setup failed!\n");
58*4882a593Smuzhiyun return ret;
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun switch (id->driver_data) {
62*4882a593Smuzhiyun case BMP180_CHIP_ID:
63*4882a593Smuzhiyun regmap_config = &bmp180_regmap_config;
64*4882a593Smuzhiyun break;
65*4882a593Smuzhiyun case BMP280_CHIP_ID:
66*4882a593Smuzhiyun case BME280_CHIP_ID:
67*4882a593Smuzhiyun regmap_config = &bmp280_regmap_config;
68*4882a593Smuzhiyun break;
69*4882a593Smuzhiyun default:
70*4882a593Smuzhiyun return -EINVAL;
71*4882a593Smuzhiyun }
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun regmap = devm_regmap_init(&spi->dev,
74*4882a593Smuzhiyun &bmp280_regmap_bus,
75*4882a593Smuzhiyun &spi->dev,
76*4882a593Smuzhiyun regmap_config);
77*4882a593Smuzhiyun if (IS_ERR(regmap)) {
78*4882a593Smuzhiyun dev_err(&spi->dev, "failed to allocate register map\n");
79*4882a593Smuzhiyun return PTR_ERR(regmap);
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun return bmp280_common_probe(&spi->dev,
83*4882a593Smuzhiyun regmap,
84*4882a593Smuzhiyun id->driver_data,
85*4882a593Smuzhiyun id->name,
86*4882a593Smuzhiyun spi->irq);
87*4882a593Smuzhiyun }
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun static const struct of_device_id bmp280_of_spi_match[] = {
90*4882a593Smuzhiyun { .compatible = "bosch,bmp085", },
91*4882a593Smuzhiyun { .compatible = "bosch,bmp180", },
92*4882a593Smuzhiyun { .compatible = "bosch,bmp181", },
93*4882a593Smuzhiyun { .compatible = "bosch,bmp280", },
94*4882a593Smuzhiyun { .compatible = "bosch,bme280", },
95*4882a593Smuzhiyun { },
96*4882a593Smuzhiyun };
97*4882a593Smuzhiyun MODULE_DEVICE_TABLE(of, bmp280_of_spi_match);
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun static const struct spi_device_id bmp280_spi_id[] = {
100*4882a593Smuzhiyun { "bmp180", BMP180_CHIP_ID },
101*4882a593Smuzhiyun { "bmp181", BMP180_CHIP_ID },
102*4882a593Smuzhiyun { "bmp280", BMP280_CHIP_ID },
103*4882a593Smuzhiyun { "bme280", BME280_CHIP_ID },
104*4882a593Smuzhiyun { }
105*4882a593Smuzhiyun };
106*4882a593Smuzhiyun MODULE_DEVICE_TABLE(spi, bmp280_spi_id);
107*4882a593Smuzhiyun
108*4882a593Smuzhiyun static struct spi_driver bmp280_spi_driver = {
109*4882a593Smuzhiyun .driver = {
110*4882a593Smuzhiyun .name = "bmp280",
111*4882a593Smuzhiyun .of_match_table = bmp280_of_spi_match,
112*4882a593Smuzhiyun .pm = &bmp280_dev_pm_ops,
113*4882a593Smuzhiyun },
114*4882a593Smuzhiyun .id_table = bmp280_spi_id,
115*4882a593Smuzhiyun .probe = bmp280_spi_probe,
116*4882a593Smuzhiyun };
117*4882a593Smuzhiyun module_spi_driver(bmp280_spi_driver);
118*4882a593Smuzhiyun
119*4882a593Smuzhiyun MODULE_DESCRIPTION("BMP280 SPI bus driver");
120*4882a593Smuzhiyun MODULE_LICENSE("GPL");
121