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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | // | |
3 | // Functions to access SY3686A power management chip voltages | |
4 | // | |
5 | // Copyright (C) 2019 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 | #include <linux/module.h> | |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/regmap.h> | |
13 | #include <linux/gpio/consumer.h> | |
14 | #include <linux/mfd/sy7636a.h> | |
15 | ||
16 | #define SY7636A_POLL_ENABLED_TIME 500 | |
17 | ||
18 | static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev) | |
19 | { | |
20 | int ret; | |
21 | unsigned int val, val_h; | |
22 | ||
23 | ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_L, &val); | |
24 | if (ret) | |
25 | return ret; | |
26 | ||
27 | ret = regmap_read(rdev->regmap, SY7636A_REG_VCOM_ADJUST_CTRL_H, &val_h); | |
28 | if (ret) | |
29 | return ret; | |
30 | ||
31 | val |= (val_h << VCOM_ADJUST_CTRL_SHIFT); | |
32 | ||
33 | return (val & VCOM_ADJUST_CTRL_MASK) * VCOM_ADJUST_CTRL_SCAL; | |
34 | } | |
35 | ||
36 | static int sy7636a_get_status(struct regulator_dev *rdev) | |
37 | { | |
38 | struct sy7636a *sy7636a = dev_get_drvdata(rdev->dev.parent); | |
39 | int ret = 0; | |
40 | ||
41 | ret = gpiod_get_value_cansleep(sy7636a->pgood_gpio); | |
42 | if (ret < 0) | |
43 | dev_err(&rdev->dev, "Failed to read pgood gpio: %d\n", ret); | |
44 | ||
45 | return ret; | |
46 | } | |
47 | ||
48 | static const struct regulator_ops sy7636a_vcom_volt_ops = { | |
49 | .get_voltage = sy7636a_get_vcom_voltage_op, | |
50 | .enable = regulator_enable_regmap, | |
51 | .disable = regulator_disable_regmap, | |
52 | .is_enabled = regulator_is_enabled_regmap, | |
53 | .get_status = sy7636a_get_status, | |
54 | }; | |
55 | ||
56 | struct regulator_desc desc = { | |
57 | .name = "vcom", | |
58 | .id = 0, | |
59 | .ops = &sy7636a_vcom_volt_ops, | |
60 | .type = REGULATOR_VOLTAGE, | |
61 | .owner = THIS_MODULE, | |
62 | .enable_reg = SY7636A_REG_OPERATION_MODE_CRL, | |
63 | .enable_mask = SY7636A_OPERATION_MODE_CRL_ONOFF, | |
64 | .poll_enabled_time = SY7636A_POLL_ENABLED_TIME, | |
65 | .regulators_node = of_match_ptr("regulators"), | |
66 | .of_match = of_match_ptr("vcom"), | |
67 | }; | |
68 | ||
69 | static int sy7636a_regulator_probe(struct platform_device *pdev) | |
70 | { | |
71 | struct sy7636a *sy7636a = dev_get_drvdata(pdev->dev.parent); | |
72 | struct regulator_config config = { }; | |
73 | struct regulator_dev *rdev; | |
74 | struct gpio_desc *gdp; | |
75 | int ret; | |
76 | ||
77 | if (!sy7636a) | |
78 | return -EPROBE_DEFER; | |
79 | ||
80 | platform_set_drvdata(pdev, sy7636a); | |
81 | ||
82 | gdp = devm_gpiod_get(sy7636a->dev, "epd-pwr-good", GPIOD_IN); | |
83 | if (IS_ERR(gdp)) { | |
84 | dev_err(sy7636a->dev, "Power good GPIO fault %ld\n", PTR_ERR(gdp)); | |
85 | return PTR_ERR(gdp); | |
86 | } | |
87 | ||
88 | sy7636a->pgood_gpio = gdp; | |
89 | ||
90 | ret = regmap_write(sy7636a->regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0); | |
91 | if (ret) { | |
92 | dev_err(sy7636a->dev, "Failed to initialize regulator: %d\n", ret); | |
93 | return ret; | |
94 | } | |
95 | ||
96 | config.dev = &pdev->dev; | |
97 | config.dev->of_node = sy7636a->dev->of_node; | |
98 | config.driver_data = sy7636a; | |
99 | config.regmap = sy7636a->regmap; | |
100 | ||
101 | rdev = devm_regulator_register(&pdev->dev, &desc, &config); | |
102 | if (IS_ERR(rdev)) { | |
103 | dev_err(sy7636a->dev, "Failed to register %s regulator\n", | |
104 | pdev->name); | |
105 | return PTR_ERR(rdev); | |
106 | } | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static const struct platform_device_id sy7636a_regulator_id_table[] = { | |
112 | { "sy7636a-regulator", }, | |
113 | }; | |
114 | MODULE_DEVICE_TABLE(platform, sy7636a_regulator_id_table); | |
115 | ||
116 | static struct platform_driver sy7636a_regulator_driver = { | |
117 | .driver = { | |
118 | .name = "sy7636a-regulator", | |
119 | }, | |
120 | .probe = sy7636a_regulator_probe, | |
121 | .id_table = sy7636a_regulator_id_table, | |
122 | }; | |
123 | module_platform_driver(sy7636a_regulator_driver); | |
124 | ||
125 | MODULE_AUTHOR("Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>"); | |
126 | MODULE_DESCRIPTION("SY7636A voltage regulator driver"); | |
127 | MODULE_LICENSE("GPL v2"); |