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16216333 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
7176ba23 RK |
2 | /* |
3 | * Copyright (c) 2011, NVIDIA Corporation. | |
7176ba23 RK |
4 | */ |
5 | ||
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6 | #include <linux/init.h> |
7 | #include <linux/kernel.h> | |
8 | #include <linux/module.h> | |
f623f75a | 9 | #include <linux/mod_devicetable.h> |
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10 | #include <linux/rfkill.h> |
11 | #include <linux/platform_device.h> | |
12 | #include <linux/clk.h> | |
13 | #include <linux/slab.h> | |
ef91ffaa | 14 | #include <linux/acpi.h> |
2111cad6 | 15 | #include <linux/gpio/consumer.h> |
7176ba23 | 16 | |
7176ba23 | 17 | struct rfkill_gpio_data { |
262c91ee HK |
18 | const char *name; |
19 | enum rfkill_type type; | |
2111cad6 HK |
20 | struct gpio_desc *reset_gpio; |
21 | struct gpio_desc *shutdown_gpio; | |
262c91ee HK |
22 | |
23 | struct rfkill *rfkill_dev; | |
262c91ee HK |
24 | struct clk *clk; |
25 | ||
26 | bool clk_enabled; | |
7176ba23 RK |
27 | }; |
28 | ||
29 | static int rfkill_gpio_set_power(void *data, bool blocked) | |
30 | { | |
31 | struct rfkill_gpio_data *rfkill = data; | |
32 | ||
771bb3dd LP |
33 | if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled) |
34 | clk_enable(rfkill->clk); | |
35 | ||
36 | gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked); | |
37 | gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked); | |
38 | ||
39 | if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled) | |
40 | clk_disable(rfkill->clk); | |
7176ba23 | 41 | |
fa5c107c | 42 | rfkill->clk_enabled = !blocked; |
7176ba23 RK |
43 | |
44 | return 0; | |
45 | } | |
46 | ||
47 | static const struct rfkill_ops rfkill_gpio_ops = { | |
48 | .set_block = rfkill_gpio_set_power, | |
49 | }; | |
50 | ||
72daceb9 MW |
51 | static const struct acpi_gpio_params reset_gpios = { 0, 0, false }; |
52 | static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false }; | |
53 | ||
54 | static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = { | |
55 | { "reset-gpios", &reset_gpios, 1 }, | |
56 | { "shutdown-gpios", &shutdown_gpios, 1 }, | |
57 | { }, | |
58 | }; | |
59 | ||
ef91ffaa HK |
60 | static int rfkill_gpio_acpi_probe(struct device *dev, |
61 | struct rfkill_gpio_data *rfkill) | |
62 | { | |
63 | const struct acpi_device_id *id; | |
64 | ||
65 | id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
66 | if (!id) | |
67 | return -ENODEV; | |
68 | ||
ef91ffaa | 69 | rfkill->type = (unsigned)id->driver_data; |
ef91ffaa | 70 | |
4524667b | 71 | return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios); |
ef91ffaa HK |
72 | } |
73 | ||
7176ba23 RK |
74 | static int rfkill_gpio_probe(struct platform_device *pdev) |
75 | { | |
262c91ee | 76 | struct rfkill_gpio_data *rfkill; |
2111cad6 | 77 | struct gpio_desc *gpio; |
7d5e9737 | 78 | const char *type_name; |
2111cad6 | 79 | int ret; |
7176ba23 | 80 | |
262c91ee HK |
81 | rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL); |
82 | if (!rfkill) | |
83 | return -ENOMEM; | |
84 | ||
7d5e9737 HK |
85 | device_property_read_string(&pdev->dev, "name", &rfkill->name); |
86 | device_property_read_string(&pdev->dev, "type", &type_name); | |
87 | ||
88 | if (!rfkill->name) | |
89 | rfkill->name = dev_name(&pdev->dev); | |
90 | ||
91 | rfkill->type = rfkill_find_type(type_name); | |
92 | ||
ef91ffaa HK |
93 | if (ACPI_HANDLE(&pdev->dev)) { |
94 | ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill); | |
95 | if (ret) | |
96 | return ret; | |
7176ba23 RK |
97 | } |
98 | ||
848ef586 | 99 | rfkill->clk = devm_clk_get(&pdev->dev, NULL); |
7176ba23 | 100 | |
f7959e9c UKK |
101 | gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW); |
102 | if (IS_ERR(gpio)) | |
103 | return PTR_ERR(gpio); | |
2111cad6 | 104 | |
f7959e9c UKK |
105 | rfkill->reset_gpio = gpio; |
106 | ||
107 | gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW); | |
108 | if (IS_ERR(gpio)) | |
109 | return PTR_ERR(gpio); | |
110 | ||
111 | rfkill->shutdown_gpio = gpio; | |
7176ba23 | 112 | |
7d5e9737 HK |
113 | /* Make sure at-least one GPIO is defined for this instance */ |
114 | if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) { | |
2111cad6 HK |
115 | dev_err(&pdev->dev, "invalid platform data\n"); |
116 | return -EINVAL; | |
117 | } | |
118 | ||
262c91ee HK |
119 | rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev, |
120 | rfkill->type, &rfkill_gpio_ops, | |
121 | rfkill); | |
5e7ca393 HK |
122 | if (!rfkill->rfkill_dev) |
123 | return -ENOMEM; | |
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124 | |
125 | ret = rfkill_register(rfkill->rfkill_dev); | |
126 | if (ret < 0) | |
4bf01ca2 | 127 | goto err_destroy; |
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128 | |
129 | platform_set_drvdata(pdev, rfkill); | |
130 | ||
262c91ee | 131 | dev_info(&pdev->dev, "%s device registered.\n", rfkill->name); |
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132 | |
133 | return 0; | |
4bf01ca2 JH |
134 | |
135 | err_destroy: | |
136 | rfkill_destroy(rfkill->rfkill_dev); | |
137 | ||
138 | return ret; | |
7176ba23 RK |
139 | } |
140 | ||
141 | static int rfkill_gpio_remove(struct platform_device *pdev) | |
142 | { | |
143 | struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev); | |
144 | ||
145 | rfkill_unregister(rfkill->rfkill_dev); | |
146 | rfkill_destroy(rfkill->rfkill_dev); | |
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147 | |
148 | return 0; | |
149 | } | |
150 | ||
41d09df1 | 151 | #ifdef CONFIG_ACPI |
ef91ffaa HK |
152 | static const struct acpi_device_id rfkill_acpi_match[] = { |
153 | { "BCM4752", RFKILL_TYPE_GPS }, | |
04f1b47c | 154 | { "LNV4752", RFKILL_TYPE_GPS }, |
ef91ffaa HK |
155 | { }, |
156 | }; | |
dda3b191 | 157 | MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match); |
41d09df1 | 158 | #endif |
ef91ffaa | 159 | |
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160 | static struct platform_driver rfkill_gpio_driver = { |
161 | .probe = rfkill_gpio_probe, | |
9e2b29d0 | 162 | .remove = rfkill_gpio_remove, |
7176ba23 | 163 | .driver = { |
262c91ee | 164 | .name = "rfkill_gpio", |
ef91ffaa | 165 | .acpi_match_table = ACPI_PTR(rfkill_acpi_match), |
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166 | }, |
167 | }; | |
168 | ||
98ef55f6 | 169 | module_platform_driver(rfkill_gpio_driver); |
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170 | |
171 | MODULE_DESCRIPTION("gpio rfkill"); | |
172 | MODULE_AUTHOR("NVIDIA"); | |
173 | MODULE_LICENSE("GPL"); |