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/i2c.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/mfd/core.h> |
21 | #include <linux/module.h> |
22 | #include <linux/of_platform.h> |
23 | #include <linux/regmap.h> |
24 | |
25 | #include "simple-mfd-i2c.h" |
26 | |
27 | static const struct regmap_config regmap_config_8r_8v = { |
28 | .reg_bits = 8, |
29 | .val_bits = 8, |
30 | }; |
31 | |
32 | static int simple_mfd_i2c_probe(struct i2c_client *i2c) |
33 | { |
34 | const struct simple_mfd_data *simple_mfd_data; |
35 | const struct regmap_config *regmap_config; |
36 | struct regmap *regmap; |
37 | int ret; |
38 | |
39 | simple_mfd_data = device_get_match_data(dev: &i2c->dev); |
40 | |
41 | /* If no regmap_config is specified, use the default 8reg and 8val bits */ |
42 | if (!simple_mfd_data || !simple_mfd_data->regmap_config) |
43 | regmap_config = ®map_config_8r_8v; |
44 | else |
45 | regmap_config = simple_mfd_data->regmap_config; |
46 | |
47 | regmap = devm_regmap_init_i2c(i2c, regmap_config); |
48 | if (IS_ERR(ptr: regmap)) |
49 | return PTR_ERR(ptr: regmap); |
50 | |
51 | /* If no MFD cells are specified, register using the DT child nodes instead */ |
52 | if (!simple_mfd_data || !simple_mfd_data->mfd_cell) |
53 | return devm_of_platform_populate(dev: &i2c->dev); |
54 | |
55 | ret = devm_mfd_add_devices(dev: &i2c->dev, PLATFORM_DEVID_AUTO, |
56 | cells: simple_mfd_data->mfd_cell, |
57 | n_devs: simple_mfd_data->mfd_cell_size, |
58 | NULL, irq_base: 0, NULL); |
59 | if (ret) |
60 | dev_err(&i2c->dev, "Failed to add child devices\n" ); |
61 | |
62 | return ret; |
63 | } |
64 | |
65 | static const struct mfd_cell sy7636a_cells[] = { |
66 | { .name = "sy7636a-regulator" , }, |
67 | { .name = "sy7636a-temperature" , }, |
68 | }; |
69 | |
70 | static const struct simple_mfd_data silergy_sy7636a = { |
71 | .mfd_cell = sy7636a_cells, |
72 | .mfd_cell_size = ARRAY_SIZE(sy7636a_cells), |
73 | }; |
74 | |
75 | static const struct mfd_cell max5970_cells[] = { |
76 | { .name = "max5970-regulator" , }, |
77 | { .name = "max5970-iio" , }, |
78 | { .name = "max5970-led" , }, |
79 | }; |
80 | |
81 | static const struct simple_mfd_data maxim_max5970 = { |
82 | .mfd_cell = max5970_cells, |
83 | .mfd_cell_size = ARRAY_SIZE(max5970_cells), |
84 | }; |
85 | |
86 | static const struct of_device_id simple_mfd_i2c_of_match[] = { |
87 | { .compatible = "kontron,sl28cpld" }, |
88 | { .compatible = "silergy,sy7636a" , .data = &silergy_sy7636a}, |
89 | { .compatible = "maxim,max5970" , .data = &maxim_max5970}, |
90 | { .compatible = "maxim,max5978" , .data = &maxim_max5970}, |
91 | {} |
92 | }; |
93 | MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match); |
94 | |
95 | static struct i2c_driver simple_mfd_i2c_driver = { |
96 | .probe = simple_mfd_i2c_probe, |
97 | .driver = { |
98 | .name = "simple-mfd-i2c" , |
99 | .of_match_table = simple_mfd_i2c_of_match, |
100 | }, |
101 | }; |
102 | module_i2c_driver(simple_mfd_i2c_driver); |
103 | |
104 | MODULE_AUTHOR("Michael Walle <michael@walle.cc>" ); |
105 | MODULE_DESCRIPTION("Simple MFD - I2C driver" ); |
106 | MODULE_LICENSE("GPL v2" ); |
107 | |