Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * BQ257XX Core Driver
4 * Copyright (C) 2025 Chris Morgan <macromorgan@hotmail.com>
5 */
6
7#include <linux/device.h>
8#include <linux/i2c.h>
9#include <linux/mfd/bq257xx.h>
10#include <linux/mfd/core.h>
11#include <linux/regmap.h>
12
13static const struct regmap_range bq25703_readonly_reg_ranges[] = {
14 regmap_reg_range(BQ25703_CHARGER_STATUS, BQ25703_MANUFACT_DEV_ID),
15};
16
17static const struct regmap_access_table bq25703_writeable_regs = {
18 .no_ranges = bq25703_readonly_reg_ranges,
19 .n_no_ranges = ARRAY_SIZE(bq25703_readonly_reg_ranges),
20};
21
22static const struct regmap_range bq25703_volatile_reg_ranges[] = {
23 regmap_reg_range(BQ25703_CHARGE_OPTION_0, BQ25703_IIN_HOST),
24 regmap_reg_range(BQ25703_CHARGER_STATUS, BQ25703_ADC_OPTION),
25};
26
27static const struct regmap_access_table bq25703_volatile_regs = {
28 .yes_ranges = bq25703_volatile_reg_ranges,
29 .n_yes_ranges = ARRAY_SIZE(bq25703_volatile_reg_ranges),
30};
31
32static const struct regmap_config bq25703_regmap_config = {
33 .reg_bits = 8,
34 .val_bits = 16,
35 .max_register = BQ25703_ADC_OPTION,
36 .cache_type = REGCACHE_MAPLE,
37 .wr_table = &bq25703_writeable_regs,
38 .volatile_table = &bq25703_volatile_regs,
39 .val_format_endian = REGMAP_ENDIAN_LITTLE,
40};
41
42static const struct mfd_cell cells[] = {
43 MFD_CELL_NAME("bq257xx-regulator"),
44 MFD_CELL_NAME("bq257xx-charger"),
45};
46
47static int bq257xx_probe(struct i2c_client *client)
48{
49 struct bq257xx_device *ddata;
50 int ret;
51
52 ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL);
53 if (!ddata)
54 return -ENOMEM;
55
56 ddata->client = client;
57
58 ddata->regmap = devm_regmap_init_i2c(client, &bq25703_regmap_config);
59 if (IS_ERR(ddata->regmap)) {
60 return dev_err_probe(&client->dev, PTR_ERR(ddata->regmap),
61 "Failed to allocate register map\n");
62 }
63
64 i2c_set_clientdata(client, ddata);
65
66 ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_AUTO,
67 cells, ARRAY_SIZE(cells), NULL, 0, NULL);
68 if (ret)
69 return dev_err_probe(&client->dev, ret,
70 "Failed to register child devices\n");
71
72 return ret;
73}
74
75static const struct i2c_device_id bq257xx_i2c_ids[] = {
76 { "bq25703a" },
77 {}
78};
79MODULE_DEVICE_TABLE(i2c, bq257xx_i2c_ids);
80
81static const struct of_device_id bq257xx_of_match[] = {
82 { .compatible = "ti,bq25703a" },
83 {}
84};
85MODULE_DEVICE_TABLE(of, bq257xx_of_match);
86
87static struct i2c_driver bq257xx_driver = {
88 .driver = {
89 .name = "bq257xx",
90 .of_match_table = bq257xx_of_match,
91 },
92 .probe = bq257xx_probe,
93 .id_table = bq257xx_i2c_ids,
94};
95module_i2c_driver(bq257xx_driver);
96
97MODULE_DESCRIPTION("bq257xx buck/boost/charger driver");
98MODULE_AUTHOR("Chris Morgan <macromorgan@hotmail.com>");
99MODULE_LICENSE("GPL");