1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2
3 #include <linux/iio/iio.h>
4 #include <linux/mod_devicetable.h>
5 #include <linux/module.h>
6 #include <linux/pm.h>
7 #include <linux/regmap.h>
8 #include <linux/spi/spi.h>
9
10 #include "bmi270.h"
11
12 /*
13 * The following two functions are taken from the BMI323 spi driver code.
14 * In section 6.4 of the BMI270 data it specifies that after a read
15 * operation the first data byte from the device is a dummy byte
16 */
bmi270_regmap_spi_read(void * spi,const void * reg_buf,size_t reg_size,void * val_buf,size_t val_size)17 static int bmi270_regmap_spi_read(void *spi, const void *reg_buf,
18 size_t reg_size, void *val_buf,
19 size_t val_size)
20 {
21 return spi_write_then_read(spi, reg_buf, reg_size, val_buf, val_size);
22 }
23
bmi270_regmap_spi_write(void * spi,const void * data,size_t count)24 static int bmi270_regmap_spi_write(void *spi, const void *data,
25 size_t count)
26 {
27 u8 *data_buff = (u8 *)data;
28
29 /*
30 * Remove the extra pad byte since its only needed for the read
31 * operation
32 */
33 data_buff[1] = data_buff[0];
34 return spi_write_then_read(spi, data_buff + 1, count - 1, NULL, 0);
35 }
36
37 static const struct regmap_bus bmi270_regmap_bus = {
38 .read = bmi270_regmap_spi_read,
39 .write = bmi270_regmap_spi_write,
40 };
41
42 static const struct regmap_config bmi270_spi_regmap_config = {
43 .reg_bits = 8,
44 .val_bits = 8,
45 .pad_bits = 8,
46 .read_flag_mask = BIT(7),
47 };
48
bmi270_spi_probe(struct spi_device * spi)49 static int bmi270_spi_probe(struct spi_device *spi)
50 {
51 struct regmap *regmap;
52 struct device *dev = &spi->dev;
53 const struct bmi270_chip_info *chip_info;
54
55 chip_info = spi_get_device_match_data(spi);
56 if (!chip_info)
57 return -ENODEV;
58
59 regmap = devm_regmap_init(dev, &bmi270_regmap_bus, dev,
60 &bmi270_spi_regmap_config);
61 if (IS_ERR(regmap))
62 return dev_err_probe(dev, PTR_ERR(regmap),
63 "Failed to init i2c regmap");
64
65 return bmi270_core_probe(dev, regmap, chip_info);
66 }
67
68 static const struct spi_device_id bmi270_spi_id[] = {
69 { "bmi260", (kernel_ulong_t)&bmi260_chip_info },
70 { "bmi270", (kernel_ulong_t)&bmi270_chip_info },
71 { }
72 };
73
74 static const struct of_device_id bmi270_of_match[] = {
75 { .compatible = "bosch,bmi260", .data = &bmi260_chip_info },
76 { .compatible = "bosch,bmi270", .data = &bmi270_chip_info },
77 { }
78 };
79
80 static struct spi_driver bmi270_spi_driver = {
81 .driver = {
82 .name = "bmi270",
83 .pm = pm_ptr(&bmi270_core_pm_ops),
84 .of_match_table = bmi270_of_match,
85 },
86 .probe = bmi270_spi_probe,
87 .id_table = bmi270_spi_id,
88 };
89 module_spi_driver(bmi270_spi_driver);
90
91 MODULE_AUTHOR("Alex Lanzano");
92 MODULE_DESCRIPTION("BMI270 driver");
93 MODULE_LICENSE("GPL");
94 MODULE_IMPORT_NS("IIO_BMI270");
95