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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Functions to access SY3686A power management chip temperature | |
4 | * | |
5 | * Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/ | |
6 | * | |
7 | * Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com> | |
8 | * Alistair Francis <alistair@alistair23.me> | |
9 | */ | |
10 | ||
11 | #include <linux/err.h> | |
12 | #include <linux/hwmon.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regmap.h> | |
17 | #include <linux/regulator/machine.h> | |
18 | ||
19 | #include <linux/mfd/sy7636a.h> | |
20 | ||
21 | static int sy7636a_read(struct device *dev, enum hwmon_sensor_types type, | |
22 | u32 attr, int channel, long *temp) | |
23 | { | |
24 | struct regmap *regmap = dev_get_drvdata(dev); | |
25 | int ret, reg_val; | |
26 | ||
27 | ret = regmap_read(regmap, | |
28 | SY7636A_REG_TERMISTOR_READOUT, ®_val); | |
29 | if (ret) | |
30 | return ret; | |
31 | ||
32 | *temp = reg_val * 1000; | |
33 | ||
34 | return 0; | |
35 | } | |
36 | ||
37 | static umode_t sy7636a_is_visible(const void *data, | |
38 | enum hwmon_sensor_types type, | |
39 | u32 attr, int channel) | |
40 | { | |
41 | if (type != hwmon_temp) | |
42 | return 0; | |
43 | ||
44 | if (attr != hwmon_temp_input) | |
45 | return 0; | |
46 | ||
47 | return 0444; | |
48 | } | |
49 | ||
50 | static const struct hwmon_ops sy7636a_hwmon_ops = { | |
51 | .is_visible = sy7636a_is_visible, | |
52 | .read = sy7636a_read, | |
53 | }; | |
54 | ||
5b5d8ae0 | 55 | static const struct hwmon_channel_info * const sy7636a_info[] = { |
de34a405 AF |
56 | HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ), |
57 | HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), | |
58 | NULL | |
59 | }; | |
60 | ||
61 | static const struct hwmon_chip_info sy7636a_chip_info = { | |
62 | .ops = &sy7636a_hwmon_ops, | |
63 | .info = sy7636a_info, | |
64 | }; | |
65 | ||
66 | static int sy7636a_sensor_probe(struct platform_device *pdev) | |
67 | { | |
68 | struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); | |
69 | struct regulator *regulator; | |
70 | struct device *hwmon_dev; | |
71 | int err; | |
72 | ||
73 | if (!regmap) | |
74 | return -EPROBE_DEFER; | |
75 | ||
76 | regulator = devm_regulator_get(&pdev->dev, "vcom"); | |
77 | if (IS_ERR(regulator)) | |
78 | return PTR_ERR(regulator); | |
79 | ||
80 | err = regulator_enable(regulator); | |
81 | if (err) | |
82 | return err; | |
83 | ||
84 | hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev, | |
85 | "sy7636a_temperature", regmap, | |
86 | &sy7636a_chip_info, NULL); | |
87 | ||
88 | if (IS_ERR(hwmon_dev)) { | |
89 | err = PTR_ERR(hwmon_dev); | |
90 | dev_err(&pdev->dev, "Unable to register hwmon device, returned %d\n", err); | |
91 | return err; | |
92 | } | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static struct platform_driver sy7636a_sensor_driver = { | |
98 | .probe = sy7636a_sensor_probe, | |
99 | .driver = { | |
100 | .name = "sy7636a-temperature", | |
101 | }, | |
102 | }; | |
103 | module_platform_driver(sy7636a_sensor_driver); | |
104 | ||
105 | MODULE_DESCRIPTION("SY7636A sensor driver"); | |
106 | MODULE_LICENSE("GPL"); |