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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/*
2 * Copyright (c) 2011, NVIDIA Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17 */
18
19#include <linux/gpio.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/rfkill.h>
24#include <linux/platform_device.h>
25#include <linux/clk.h>
26#include <linux/slab.h>
27#include <linux/acpi.h>
28#include <linux/gpio/consumer.h>
29
30struct rfkill_gpio_data {
31 const char *name;
32 enum rfkill_type type;
33 struct gpio_desc *reset_gpio;
34 struct gpio_desc *shutdown_gpio;
35
36 struct rfkill *rfkill_dev;
37 struct clk *clk;
38
39 bool clk_enabled;
40};
41
42static int rfkill_gpio_set_power(void *data, bool blocked)
43{
44 struct rfkill_gpio_data *rfkill = data;
45
46 if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
47 clk_enable(rfkill->clk);
48
49 gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
50 gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
51
52 if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
53 clk_disable(rfkill->clk);
54
55 rfkill->clk_enabled = !blocked;
56
57 return 0;
58}
59
60static const struct rfkill_ops rfkill_gpio_ops = {
61 .set_block = rfkill_gpio_set_power,
62};
63
64static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
65static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
66
67static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
68 { "reset-gpios", &reset_gpios, 1 },
69 { "shutdown-gpios", &shutdown_gpios, 1 },
70 { },
71};
72
73static int rfkill_gpio_acpi_probe(struct device *dev,
74 struct rfkill_gpio_data *rfkill)
75{
76 const struct acpi_device_id *id;
77
78 id = acpi_match_device(dev->driver->acpi_match_table, dev);
79 if (!id)
80 return -ENODEV;
81
82 rfkill->type = (unsigned)id->driver_data;
83
84 return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
85 acpi_rfkill_default_gpios);
86}
87
88static int rfkill_gpio_probe(struct platform_device *pdev)
89{
90 struct rfkill_gpio_data *rfkill;
91 struct gpio_desc *gpio;
92 const char *type_name;
93 int ret;
94
95 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
96 if (!rfkill)
97 return -ENOMEM;
98
99 device_property_read_string(&pdev->dev, "name", &rfkill->name);
100 device_property_read_string(&pdev->dev, "type", &type_name);
101
102 if (!rfkill->name)
103 rfkill->name = dev_name(&pdev->dev);
104
105 rfkill->type = rfkill_find_type(type_name);
106
107 if (ACPI_HANDLE(&pdev->dev)) {
108 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
109 if (ret)
110 return ret;
111 }
112
113 rfkill->clk = devm_clk_get(&pdev->dev, NULL);
114
115 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
116 if (IS_ERR(gpio))
117 return PTR_ERR(gpio);
118
119 rfkill->reset_gpio = gpio;
120
121 gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW);
122 if (IS_ERR(gpio))
123 return PTR_ERR(gpio);
124
125 rfkill->shutdown_gpio = gpio;
126
127 /* Make sure at-least one GPIO is defined for this instance */
128 if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
129 dev_err(&pdev->dev, "invalid platform data\n");
130 return -EINVAL;
131 }
132
133 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
134 rfkill->type, &rfkill_gpio_ops,
135 rfkill);
136 if (!rfkill->rfkill_dev)
137 return -ENOMEM;
138
139 ret = rfkill_register(rfkill->rfkill_dev);
140 if (ret < 0)
141 return ret;
142
143 platform_set_drvdata(pdev, rfkill);
144
145 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
146
147 return 0;
148}
149
150static int rfkill_gpio_remove(struct platform_device *pdev)
151{
152 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
153
154 rfkill_unregister(rfkill->rfkill_dev);
155 rfkill_destroy(rfkill->rfkill_dev);
156
157 acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
158
159 return 0;
160}
161
162#ifdef CONFIG_ACPI
163static const struct acpi_device_id rfkill_acpi_match[] = {
164 { "BCM4752", RFKILL_TYPE_GPS },
165 { "LNV4752", RFKILL_TYPE_GPS },
166 { },
167};
168MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
169#endif
170
171static struct platform_driver rfkill_gpio_driver = {
172 .probe = rfkill_gpio_probe,
173 .remove = rfkill_gpio_remove,
174 .driver = {
175 .name = "rfkill_gpio",
176 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
177 },
178};
179
180module_platform_driver(rfkill_gpio_driver);
181
182MODULE_DESCRIPTION("gpio rfkill");
183MODULE_AUTHOR("NVIDIA");
184MODULE_LICENSE("GPL");