powerpc/pseries/pci: Remove obsolete SW invalidate
[linux/fpc-iii.git] / net / rfkill / rfkill-gpio.c
blob76c01cbd56e35b209bf5e2599298471263f14ded
1 /*
2 * Copyright (c) 2011, NVIDIA Corporation.
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.
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.
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.
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>
30 struct rfkill_gpio_data {
31 const char *name;
32 enum rfkill_type type;
33 struct gpio_desc *reset_gpio;
34 struct gpio_desc *shutdown_gpio;
36 struct rfkill *rfkill_dev;
37 struct clk *clk;
39 bool clk_enabled;
42 static int rfkill_gpio_set_power(void *data, bool blocked)
44 struct rfkill_gpio_data *rfkill = data;
46 if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
47 clk_enable(rfkill->clk);
49 gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
50 gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
52 if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
53 clk_disable(rfkill->clk);
55 rfkill->clk_enabled = !blocked;
57 return 0;
60 static const struct rfkill_ops rfkill_gpio_ops = {
61 .set_block = rfkill_gpio_set_power,
64 static const struct acpi_gpio_params reset_gpios = { 0, 0, false };
65 static const struct acpi_gpio_params shutdown_gpios = { 1, 0, false };
67 static const struct acpi_gpio_mapping acpi_rfkill_default_gpios[] = {
68 { "reset-gpios", &reset_gpios, 1 },
69 { "shutdown-gpios", &shutdown_gpios, 1 },
70 { },
73 static int rfkill_gpio_acpi_probe(struct device *dev,
74 struct rfkill_gpio_data *rfkill)
76 const struct acpi_device_id *id;
78 id = acpi_match_device(dev->driver->acpi_match_table, dev);
79 if (!id)
80 return -ENODEV;
82 rfkill->type = (unsigned)id->driver_data;
84 return acpi_dev_add_driver_gpios(ACPI_COMPANION(dev),
85 acpi_rfkill_default_gpios);
88 static int rfkill_gpio_probe(struct platform_device *pdev)
90 struct rfkill_gpio_data *rfkill;
91 struct gpio_desc *gpio;
92 const char *type_name;
93 int ret;
95 rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
96 if (!rfkill)
97 return -ENOMEM;
99 device_property_read_string(&pdev->dev, "name", &rfkill->name);
100 device_property_read_string(&pdev->dev, "type", &type_name);
102 if (!rfkill->name)
103 rfkill->name = dev_name(&pdev->dev);
105 rfkill->type = rfkill_find_type(type_name);
107 if (ACPI_HANDLE(&pdev->dev)) {
108 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
109 if (ret)
110 return ret;
113 rfkill->clk = devm_clk_get(&pdev->dev, NULL);
115 gpio = devm_gpiod_get_optional(&pdev->dev, "reset", GPIOD_OUT_LOW);
116 if (IS_ERR(gpio))
117 return PTR_ERR(gpio);
119 rfkill->reset_gpio = gpio;
121 gpio = devm_gpiod_get_optional(&pdev->dev, "shutdown", GPIOD_OUT_LOW);
122 if (IS_ERR(gpio))
123 return PTR_ERR(gpio);
125 rfkill->shutdown_gpio = gpio;
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;
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;
139 ret = rfkill_register(rfkill->rfkill_dev);
140 if (ret < 0)
141 return ret;
143 platform_set_drvdata(pdev, rfkill);
145 dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
147 return 0;
150 static int rfkill_gpio_remove(struct platform_device *pdev)
152 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
154 rfkill_unregister(rfkill->rfkill_dev);
155 rfkill_destroy(rfkill->rfkill_dev);
157 acpi_dev_remove_driver_gpios(ACPI_COMPANION(&pdev->dev));
159 return 0;
162 #ifdef CONFIG_ACPI
163 static const struct acpi_device_id rfkill_acpi_match[] = {
164 { "BCM4752", RFKILL_TYPE_GPS },
165 { "LNV4752", RFKILL_TYPE_GPS },
166 { },
168 MODULE_DEVICE_TABLE(acpi, rfkill_acpi_match);
169 #endif
171 static 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),
180 module_platform_driver(rfkill_gpio_driver);
182 MODULE_DESCRIPTION("gpio rfkill");
183 MODULE_AUTHOR("NVIDIA");
184 MODULE_LICENSE("GPL");