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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Simple MFD - I2C
4 *
5 * Author(s):
6 * Michael Walle <michael@walle.cc>
7 * Lee Jones <lee.jones@linaro.org>
8 *
9 * This driver creates a single register map with the intention for it to be
10 * shared by all sub-devices. Children can use their parent's device structure
11 * (dev.parent) in order to reference it.
12 *
13 * Once the register map has been successfully initialised, any sub-devices
14 * represented by child nodes in Device Tree or via the MFD cells in this file
15 * will be subsequently registered.
16 */
17
18#include <linux/array_size.h>
19#include <linux/dev_printk.h>
20#include <linux/err.h>
21#include <linux/i2c.h>
22#include <linux/mfd/core.h>
23#include <linux/mod_devicetable.h>
24#include <linux/module.h>
25#include <linux/of_platform.h>
26#include <linux/platform_device.h>
27#include <linux/property.h>
28#include <linux/regmap.h>
29#include <linux/stddef.h>
30
31#include "simple-mfd-i2c.h"
32
33static const struct regmap_config regmap_config_8r_8v = {
34 .reg_bits = 8,
35 .val_bits = 8,
36};
37
38static int simple_mfd_i2c_probe(struct i2c_client *i2c)
39{
40 const struct simple_mfd_data *simple_mfd_data;
41 const struct regmap_config *regmap_config;
42 struct regmap *regmap;
43 int ret;
44
45 simple_mfd_data = device_get_match_data(&i2c->dev);
46
47 /* If no regmap_config is specified, use the default 8reg and 8val bits */
48 if (!simple_mfd_data || !simple_mfd_data->regmap_config)
49 regmap_config = ®map_config_8r_8v;
50 else
51 regmap_config = simple_mfd_data->regmap_config;
52
53 regmap = devm_regmap_init_i2c(i2c, regmap_config);
54 if (IS_ERR(regmap))
55 return PTR_ERR(regmap);
56
57 /* If no MFD cells are specified, register using the DT child nodes instead */
58 if (!simple_mfd_data || !simple_mfd_data->mfd_cell)
59 return devm_of_platform_populate(&i2c->dev);
60
61 ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
62 simple_mfd_data->mfd_cell,
63 simple_mfd_data->mfd_cell_size,
64 NULL, 0, NULL);
65 if (ret)
66 dev_err(&i2c->dev, "Failed to add child devices\n");
67
68 return ret;
69}
70
71static const struct mfd_cell sy7636a_cells[] = {
72 { .name = "sy7636a-regulator", },
73 { .name = "sy7636a-temperature", },
74};
75
76static const struct simple_mfd_data silergy_sy7636a = {
77 .mfd_cell = sy7636a_cells,
78 .mfd_cell_size = ARRAY_SIZE(sy7636a_cells),
79};
80
81static const struct mfd_cell max5970_cells[] = {
82 { .name = "max5970-regulator", },
83 { .name = "max5970-iio", },
84 { .name = "max5970-led", },
85};
86
87static const struct simple_mfd_data maxim_max5970 = {
88 .mfd_cell = max5970_cells,
89 .mfd_cell_size = ARRAY_SIZE(max5970_cells),
90};
91
92static const struct mfd_cell max77705_sensor_cells[] = {
93 { .name = "max77705-battery" },
94 { .name = "max77705-hwmon", },
95};
96
97static const struct simple_mfd_data maxim_mon_max77705 = {
98 .mfd_cell = max77705_sensor_cells,
99 .mfd_cell_size = ARRAY_SIZE(max77705_sensor_cells),
100};
101
102static const struct regmap_config spacemit_p1_regmap_config = {
103 .reg_bits = 8,
104 .val_bits = 8,
105};
106
107static const struct mfd_cell spacemit_p1_cells[] = {
108 { .name = "spacemit-p1-regulator", },
109 { .name = "spacemit-p1-rtc", },
110};
111
112static const struct simple_mfd_data spacemit_p1 = {
113 .regmap_config = &spacemit_p1_regmap_config,
114 .mfd_cell = spacemit_p1_cells,
115 .mfd_cell_size = ARRAY_SIZE(spacemit_p1_cells),
116};
117
118static const struct of_device_id simple_mfd_i2c_of_match[] = {
119 { .compatible = "fsl,ls1028aqds-fpga" },
120 { .compatible = "fsl,lx2160aqds-fpga" },
121 { .compatible = "fsl,lx2160ardb-fpga" },
122 { .compatible = "kontron,sl28cpld" },
123 { .compatible = "maxim,max5970", .data = &maxim_max5970 },
124 { .compatible = "maxim,max5978", .data = &maxim_max5970 },
125 { .compatible = "maxim,max77705-battery", .data = &maxim_mon_max77705 },
126 { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a },
127 { .compatible = "spacemit,p1", .data = &spacemit_p1 },
128 {}
129};
130MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
131
132static struct i2c_driver simple_mfd_i2c_driver = {
133 .probe = simple_mfd_i2c_probe,
134 .driver = {
135 .name = "simple-mfd-i2c",
136 .of_match_table = simple_mfd_i2c_of_match,
137 },
138};
139module_i2c_driver(simple_mfd_i2c_driver);
140
141MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
142MODULE_DESCRIPTION("Simple MFD - I2C driver");
143MODULE_LICENSE("GPL v2");