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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/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");
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");