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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2011, NVIDIA Corporation.
4 */
5
6#include <linux/init.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/mod_devicetable.h>
10#include <linux/rfkill.h>
11#include <linux/of.h>
12#include <linux/platform_device.h>
13#include <linux/clk.h>
14#include <linux/slab.h>
15#include <linux/acpi.h>
16#include <linux/gpio/consumer.h>
17
18struct rfkill_gpio_data {
19 const char *name;
20 enum rfkill_type type;
21 struct gpio_desc *reset_gpio;
22 struct gpio_desc *shutdown_gpio;
23
24 struct rfkill *rfkill_dev;
25 struct clk *clk;
26
27 bool clk_enabled;
28};
29
30static int rfkill_gpio_set_power(void *data, bool blocked)
31{
32 struct rfkill_gpio_data *rfkill = data;
33
34 if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
35 clk_enable(rfkill->clk);
36
37 gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
38 gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
39
40 if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
41 clk_disable(rfkill->clk);
42
43 rfkill->clk_enabled = !blocked;
44
45 return 0;
46}
47
48static const struct rfkill_ops rfkill_gpio_ops = {
49 .set_block = rfkill_gpio_set_power,
50};
51
52static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
53static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
54
55static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
56 { "reset-gpios", &reset_gpios, 1 },
57 { "shutdown-gpios", &shutdown_gpios, 1 },
58 { },
59};
60
61static int rfkill_gpio_acpi_probe(struct device *dev,
62 struct rfkill_gpio_data *rfkill)
63{
64 const struct acpi_device_id *id;
65
66 id = acpi_match_device(dev->driver->acpi_match_table, dev);
67 if (!id)
68 return -ENODEV;
69
70 rfkill->type = (unsigned)id->driver_data;
71
72 return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios);
73}
74
75static int rfkill_gpio_probe(struct platform_device *pdev)
76{
77 struct rfkill_gpio_data *rfkill;
78 struct gpio_desc *gpio;
79 const char *name_property;
80 const char *type_property;
81 const char *type_name;
82 int ret;
83
84 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
85 if (!rfkill)
86 return -ENOMEM;
87
88 if (dev_of_node(&pdev->dev)) {
89 name_property = "label";
90 type_property = "radio-type";
91 } else {
92 name_property = "name";
93 type_property = "type";
94 }
95 device_property_read_string(&pdev->dev, name_property, &rfkill->name);
96 device_property_read_string(&pdev->dev, type_property, &type_name);
97
98 if (!rfkill->name)
99 rfkill->name = dev_name(&pdev->dev);
100
101 rfkill->type = rfkill_find_type(type_name);
102
103 if (ACPI_HANDLE(&pdev->dev)) {
104 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
105 if (ret)
106 return ret;
107 }
108
109 rfkill->clk = devm_clk_get(&pdev->dev, NULL);
110
111 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_ASIS);
112 if (IS_ERR(gpio))
113 return PTR_ERR(gpio);
114
115 rfkill->reset_gpio = gpio;
116
117 gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_ASIS);
118 if (IS_ERR(gpio))
119 return PTR_ERR(gpio);
120
121 rfkill->shutdown_gpio = gpio;
122
123 /* Make sure at-least one GPIO is defined for this instance */
124 if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
125 dev_err(&pdev->dev, "invalid platform data\n");
126 return -EINVAL;
127 }
128
129 ret = gpiod_direction_output(rfkill->reset_gpio, true);
130 if (ret)
131 return ret;
132
133 ret = gpiod_direction_output(rfkill->shutdown_gpio, true);
134 if (ret)
135 return ret;
136
137 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
138 rfkill->type, &rfkill_gpio_ops,
139 rfkill);
140 if (!rfkill->rfkill_dev)
141 return -ENOMEM;
142
143 ret = rfkill_register(rfkill->rfkill_dev);
144 if (ret < 0)
145 goto err_destroy;
146
147 platform_set_drvdata(pdev, rfkill);
148
149 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
150
151 return 0;
152
153err_destroy:
154 rfkill_destroy(rfkill->rfkill_dev);
155
156 return ret;
157}
158
159static int rfkill_gpio_remove(struct platform_device *pdev)
160{
161 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
162
163 rfkill_unregister(rfkill->rfkill_dev);
164 rfkill_destroy(rfkill->rfkill_dev);
165
166 return 0;
167}
168
169#ifdef CONFIG_ACPI
170static const struct acpi_device_id rfkill_acpi_match[] = {
171 { "BCM4752", RFKILL_TYPE_GPS },
172 { "LNV4752", RFKILL_TYPE_GPS },
173 { },
174};
175MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
176#endif
177
178static const struct of_device_id rfkill_of_match[] __maybe_unused = {
179 { .compatible = "rfkill-gpio", },
180 { },
181};
182MODULE_DEVICE_TABLE(of, rfkill_of_match);
183
184static struct platform_driver rfkill_gpio_driver = {
185 .probe = rfkill_gpio_probe,
186 .remove = rfkill_gpio_remove,
187 .driver = {
188 .name = "rfkill_gpio",
189 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
190 .of_match_table = of_match_ptr(rfkill_of_match),
191 },
192};
193
194module_platform_driver(rfkill_gpio_driver);
195
196MODULE_DESCRIPTION("gpio rfkill");
197MODULE_AUTHOR("NVIDIA");
198MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2011, NVIDIA Corporation.
4 */
5
6#include <linux/init.h>
7#include <linux/kernel.h>
8#include <linux/module.h>
9#include <linux/mod_devicetable.h>
10#include <linux/rfkill.h>
11#include <linux/platform_device.h>
12#include <linux/clk.h>
13#include <linux/slab.h>
14#include <linux/acpi.h>
15#include <linux/gpio/consumer.h>
16
17struct rfkill_gpio_data {
18 const char *name;
19 enum rfkill_type type;
20 struct gpio_desc *reset_gpio;
21 struct gpio_desc *shutdown_gpio;
22
23 struct rfkill *rfkill_dev;
24 struct clk *clk;
25
26 bool clk_enabled;
27};
28
29static int rfkill_gpio_set_power(void *data, bool blocked)
30{
31 struct rfkill_gpio_data *rfkill = data;
32
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);
41
42 rfkill->clk_enabled = !blocked;
43
44 return 0;
45}
46
47static const struct rfkill_ops rfkill_gpio_ops = {
48 .set_block = rfkill_gpio_set_power,
49};
50
51static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
52static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
53
54static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
55 { "reset-gpios", &reset_gpios, 1 },
56 { "shutdown-gpios", &shutdown_gpios, 1 },
57 { },
58};
59
60static 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
69 rfkill->type = (unsigned)id->driver_data;
70
71 return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios);
72}
73
74static int rfkill_gpio_probe(struct platform_device *pdev)
75{
76 struct rfkill_gpio_data *rfkill;
77 struct gpio_desc *gpio;
78 const char *type_name;
79 int ret;
80
81 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
82 if (!rfkill)
83 return -ENOMEM;
84
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
93 if (ACPI_HANDLE(&pdev->dev)) {
94 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
95 if (ret)
96 return ret;
97 }
98
99 rfkill->clk = devm_clk_get(&pdev->dev, NULL);
100
101 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
102 if (IS_ERR(gpio))
103 return PTR_ERR(gpio);
104
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;
112
113 /* Make sure at-least one GPIO is defined for this instance */
114 if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
115 dev_err(&pdev->dev, "invalid platform data\n");
116 return -EINVAL;
117 }
118
119 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
120 rfkill->type, &rfkill_gpio_ops,
121 rfkill);
122 if (!rfkill->rfkill_dev)
123 return -ENOMEM;
124
125 ret = rfkill_register(rfkill->rfkill_dev);
126 if (ret < 0)
127 goto err_destroy;
128
129 platform_set_drvdata(pdev, rfkill);
130
131 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
132
133 return 0;
134
135err_destroy:
136 rfkill_destroy(rfkill->rfkill_dev);
137
138 return ret;
139}
140
141static 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);
147
148 return 0;
149}
150
151#ifdef CONFIG_ACPI
152static const struct acpi_device_id rfkill_acpi_match[] = {
153 { "BCM4752", RFKILL_TYPE_GPS },
154 { "LNV4752", RFKILL_TYPE_GPS },
155 { },
156};
157MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
158#endif
159
160static struct platform_driver rfkill_gpio_driver = {
161 .probe = rfkill_gpio_probe,
162 .remove = rfkill_gpio_remove,
163 .driver = {
164 .name = "rfkill_gpio",
165 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
166 },
167};
168
169module_platform_driver(rfkill_gpio_driver);
170
171MODULE_DESCRIPTION("gpio rfkill");
172MODULE_AUTHOR("NVIDIA");
173MODULE_LICENSE("GPL");