Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2011, NVIDIA Corporation.
4 */
5
6#include <linux/dmi.h>
7#include <linux/init.h>
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/mod_devicetable.h>
11#include <linux/rfkill.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/clk.h>
15#include <linux/slab.h>
16#include <linux/acpi.h>
17#include <linux/gpio/consumer.h>
18
19struct rfkill_gpio_data {
20 const char *name;
21 enum rfkill_type type;
22 struct gpio_desc *reset_gpio;
23 struct gpio_desc *shutdown_gpio;
24
25 struct rfkill *rfkill_dev;
26 struct clk *clk;
27
28 bool clk_enabled;
29};
30
31static int rfkill_gpio_set_power(void *data, bool blocked)
32{
33 struct rfkill_gpio_data *rfkill = data;
34
35 if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled) {
36 int ret = clk_enable(rfkill->clk);
37
38 if (ret)
39 return ret;
40 }
41
42 gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
43 gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
44
45 if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
46 clk_disable(rfkill->clk);
47
48 rfkill->clk_enabled = !blocked;
49
50 return 0;
51}
52
53static const struct rfkill_ops rfkill_gpio_ops = {
54 .set_block = rfkill_gpio_set_power,
55};
56
57static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
58static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
59
60static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
61 { "reset-gpios", &reset_gpios, 1 },
62 { "shutdown-gpios", &shutdown_gpios, 1 },
63 { },
64};
65
66static int rfkill_gpio_acpi_probe(struct device *dev,
67 struct rfkill_gpio_data *rfkill)
68{
69 const struct acpi_device_id *id;
70
71 id = acpi_match_device(dev->driver->acpi_match_table, dev);
72 if (!id)
73 return -ENODEV;
74
75 rfkill->type = (unsigned)id->driver_data;
76
77 return devm_acpi_dev_add_driver_gpios(dev, acpi_rfkill_default_gpios);
78}
79
80/* List of DMI matches for devices on which rfkill-gpio should not load,
81 * to avoid firmware bugs.
82 */
83static const struct dmi_system_id rfkill_gpio_deny_table[] = {
84 {
85 /* Lenovo Yoga Tab 3 Pro YT3-X90, bogus "BCM4752" device in DSDT */
86 .matches = {
87 DMI_MATCH(DMI_SYS_VENDOR, "Intel Corporation"),
88 DMI_MATCH(DMI_PRODUCT_VERSION, "Blade3-10A-001"),
89 },
90 },
91 { }
92};
93
94static int rfkill_gpio_probe(struct platform_device *pdev)
95{
96 struct rfkill_gpio_data *rfkill;
97 const char *type_name = NULL;
98 const char *name_property;
99 const char *type_property;
100 struct gpio_desc *gpio;
101 int ret;
102
103 if (dmi_check_system(rfkill_gpio_deny_table))
104 return -ENODEV;
105
106 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
107 if (!rfkill)
108 return -ENOMEM;
109
110 if (dev_of_node(&pdev->dev)) {
111 name_property = "label";
112 type_property = "radio-type";
113 } else {
114 name_property = "name";
115 type_property = "type";
116 }
117 device_property_read_string(&pdev->dev, name_property, &rfkill->name);
118 device_property_read_string(&pdev->dev, type_property, &type_name);
119
120 if (!rfkill->name)
121 rfkill->name = dev_name(&pdev->dev);
122
123 rfkill->type = rfkill_find_type(type_name);
124
125 if (ACPI_HANDLE(&pdev->dev)) {
126 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
127 if (ret)
128 return ret;
129 }
130
131 rfkill->clk = devm_clk_get(&pdev->dev, NULL);
132
133 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_ASIS);
134 if (IS_ERR(gpio))
135 return PTR_ERR(gpio);
136
137 rfkill->reset_gpio = gpio;
138
139 gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_ASIS);
140 if (IS_ERR(gpio))
141 return PTR_ERR(gpio);
142
143 rfkill->shutdown_gpio = gpio;
144
145 /* Make sure at-least one GPIO is defined for this instance */
146 if (!rfkill->reset_gpio && !rfkill->shutdown_gpio) {
147 dev_err(&pdev->dev, "invalid platform data\n");
148 return -EINVAL;
149 }
150
151 ret = gpiod_direction_output(rfkill->reset_gpio, true);
152 if (ret)
153 return ret;
154
155 ret = gpiod_direction_output(rfkill->shutdown_gpio, true);
156 if (ret)
157 return ret;
158
159 rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
160 rfkill->type, &rfkill_gpio_ops,
161 rfkill);
162 if (!rfkill->rfkill_dev)
163 return -ENOMEM;
164
165 if (device_property_present(&pdev->dev, "default-blocked"))
166 rfkill_init_sw_state(rfkill->rfkill_dev, true);
167
168 ret = rfkill_register(rfkill->rfkill_dev);
169 if (ret < 0)
170 goto err_destroy;
171
172 platform_set_drvdata(pdev, rfkill);
173
174 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
175
176 return 0;
177
178err_destroy:
179 rfkill_destroy(rfkill->rfkill_dev);
180
181 return ret;
182}
183
184static void rfkill_gpio_remove(struct platform_device *pdev)
185{
186 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
187
188 rfkill_unregister(rfkill->rfkill_dev);
189 rfkill_destroy(rfkill->rfkill_dev);
190}
191
192#ifdef CONFIG_ACPI
193static const struct acpi_device_id rfkill_acpi_match[] = {
194 { "BCM4752", RFKILL_TYPE_GPS },
195 { "LNV4752", RFKILL_TYPE_GPS },
196 { },
197};
198MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
199#endif
200
201static const struct of_device_id rfkill_of_match[] __maybe_unused = {
202 { .compatible = "rfkill-gpio", },
203 { },
204};
205MODULE_DEVICE_TABLE(of, rfkill_of_match);
206
207static struct platform_driver rfkill_gpio_driver = {
208 .probe = rfkill_gpio_probe,
209 .remove = rfkill_gpio_remove,
210 .driver = {
211 .name = "rfkill_gpio",
212 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
213 .of_match_table = of_match_ptr(rfkill_of_match),
214 },
215};
216
217module_platform_driver(rfkill_gpio_driver);
218
219MODULE_DESCRIPTION("gpio rfkill");
220MODULE_AUTHOR("NVIDIA");
221MODULE_LICENSE("GPL");