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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
30#include <linux/rfkill-gpio.h>
31
32struct rfkill_gpio_data {
33 const char *name;
34 enum rfkill_type type;
35 struct gpio_desc *reset_gpio;
36 struct gpio_desc *shutdown_gpio;
37
38 struct rfkill *rfkill_dev;
39 char *reset_name;
40 char *shutdown_name;
41 struct clk *clk;
42
43 bool clk_enabled;
44};
45
46static int rfkill_gpio_set_power(void *data, bool blocked)
47{
48 struct rfkill_gpio_data *rfkill = data;
49
50 if (blocked) {
51 gpiod_set_value(rfkill->shutdown_gpio, 0);
52 gpiod_set_value(rfkill->reset_gpio, 0);
53 if (!IS_ERR(rfkill->clk) && rfkill->clk_enabled)
54 clk_disable(rfkill->clk);
55 } else {
56 if (!IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
57 clk_enable(rfkill->clk);
58 gpiod_set_value(rfkill->reset_gpio, 1);
59 gpiod_set_value(rfkill->shutdown_gpio, 1);
60 }
61
62 rfkill->clk_enabled = blocked;
63
64 return 0;
65}
66
67static const struct rfkill_ops rfkill_gpio_ops = {
68 .set_block = rfkill_gpio_set_power,
69};
70
71static int rfkill_gpio_acpi_probe(struct device *dev,
72 struct rfkill_gpio_data *rfkill)
73{
74 const struct acpi_device_id *id;
75
76 id = acpi_match_device(dev->driver->acpi_match_table, dev);
77 if (!id)
78 return -ENODEV;
79
80 rfkill->name = dev_name(dev);
81 rfkill->type = (unsigned)id->driver_data;
82
83 return 0;
84}
85
86static int rfkill_gpio_probe(struct platform_device *pdev)
87{
88 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
89 struct rfkill_gpio_data *rfkill;
90 const char *clk_name = NULL;
91 struct gpio_desc *gpio;
92 int ret;
93 int len;
94
95 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
96 if (!rfkill)
97 return -ENOMEM;
98
99 if (ACPI_HANDLE(&pdev->dev)) {
100 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
101 if (ret)
102 return ret;
103 } else if (pdata) {
104 clk_name = pdata->power_clk_name;
105 rfkill->name = pdata->name;
106 rfkill->type = pdata->type;
107 } else {
108 return -ENODEV;
109 }
110
111 len = strlen(rfkill->name);
112 rfkill->reset_name = devm_kzalloc(&pdev->dev, len + 7, GFP_KERNEL);
113 if (!rfkill->reset_name)
114 return -ENOMEM;
115
116 rfkill->shutdown_name = devm_kzalloc(&pdev->dev, len + 10, GFP_KERNEL);
117 if (!rfkill->shutdown_name)
118 return -ENOMEM;
119
120 snprintf(rfkill->reset_name, len + 6 , "%s_reset", rfkill->name);
121 snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", rfkill->name);
122
123 rfkill->clk = devm_clk_get(&pdev->dev, clk_name);
124
125 gpio = devm_gpiod_get_index(&pdev->dev, rfkill->reset_name, 0);
126 if (!IS_ERR(gpio)) {
127 ret = gpiod_direction_output(gpio, 0);
128 if (ret)
129 return ret;
130 rfkill->reset_gpio = gpio;
131 }
132
133 gpio = devm_gpiod_get_index(&pdev->dev, rfkill->shutdown_name, 1);
134 if (!IS_ERR(gpio)) {
135 ret = gpiod_direction_output(gpio, 0);
136 if (ret)
137 return ret;
138 rfkill->shutdown_gpio = gpio;
139 }
140
141 /* Make sure at-least one of the GPIO is defined and that
142 * a name is specified for this instance
143 */
144 if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) {
145 dev_err(&pdev->dev, "invalid platform data\n");
146 return -EINVAL;
147 }
148
149 if (pdata && pdata->gpio_runtime_setup) {
150 ret = pdata->gpio_runtime_setup(pdev);
151 if (ret) {
152 dev_err(&pdev->dev, "can't set up gpio\n");
153 return ret;
154 }
155 }
156
157 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
158 rfkill->type, &rfkill_gpio_ops,
159 rfkill);
160 if (!rfkill->rfkill_dev)
161 return -ENOMEM;
162
163 ret = rfkill_register(rfkill->rfkill_dev);
164 if (ret < 0)
165 return ret;
166
167 platform_set_drvdata(pdev, rfkill);
168
169 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
170
171 return 0;
172}
173
174static int rfkill_gpio_remove(struct platform_device *pdev)
175{
176 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
177 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
178
179 if (pdata && pdata->gpio_runtime_close)
180 pdata->gpio_runtime_close(pdev);
181 rfkill_unregister(rfkill->rfkill_dev);
182 rfkill_destroy(rfkill->rfkill_dev);
183
184 return 0;
185}
186
187static const struct acpi_device_id rfkill_acpi_match[] = {
188 { "BCM4752", RFKILL_TYPE_GPS },
189 { },
190};
191
192static struct platform_driver rfkill_gpio_driver = {
193 .probe = rfkill_gpio_probe,
194 .remove = rfkill_gpio_remove,
195 .driver = {
196 .name = "rfkill_gpio",
197 .owner = THIS_MODULE,
198 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
199 },
200};
201
202module_platform_driver(rfkill_gpio_driver);
203
204MODULE_DESCRIPTION("gpio rfkill");
205MODULE_AUTHOR("NVIDIA");
206MODULE_LICENSE("GPL");