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Linux/net/rfkill/rfkill-gpio.c

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  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 
 32 struct 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         struct clk              *clk;
 40 
 41         bool                    clk_enabled;
 42 };
 43 
 44 static int rfkill_gpio_set_power(void *data, bool blocked)
 45 {
 46         struct rfkill_gpio_data *rfkill = data;
 47 
 48         if (!blocked && !IS_ERR(rfkill->clk) && !rfkill->clk_enabled)
 49                 clk_enable(rfkill->clk);
 50 
 51         gpiod_set_value_cansleep(rfkill->shutdown_gpio, !blocked);
 52         gpiod_set_value_cansleep(rfkill->reset_gpio, !blocked);
 53 
 54         if (blocked && !IS_ERR(rfkill->clk) && rfkill->clk_enabled)
 55                 clk_disable(rfkill->clk);
 56 
 57         rfkill->clk_enabled = blocked;
 58 
 59         return 0;
 60 }
 61 
 62 static const struct rfkill_ops rfkill_gpio_ops = {
 63         .set_block = rfkill_gpio_set_power,
 64 };
 65 
 66 static 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->name = dev_name(dev);
 76         rfkill->type = (unsigned)id->driver_data;
 77 
 78         return 0;
 79 }
 80 
 81 static int rfkill_gpio_probe(struct platform_device *pdev)
 82 {
 83         struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
 84         struct rfkill_gpio_data *rfkill;
 85         struct gpio_desc *gpio;
 86         int ret;
 87 
 88         rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);
 89         if (!rfkill)
 90                 return -ENOMEM;
 91 
 92         if (ACPI_HANDLE(&pdev->dev)) {
 93                 ret = rfkill_gpio_acpi_probe(&pdev->dev, rfkill);
 94                 if (ret)
 95                         return ret;
 96         } else if (pdata) {
 97                 rfkill->name = pdata->name;
 98                 rfkill->type = pdata->type;
 99         } else {
100                 return -ENODEV;
101         }
102 
103         rfkill->clk = devm_clk_get(&pdev->dev, NULL);
104 
105         gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0);
106         if (!IS_ERR(gpio)) {
107                 ret = gpiod_direction_output(gpio, 0);
108                 if (ret)
109                         return ret;
110                 rfkill->reset_gpio = gpio;
111         }
112 
113         gpio = devm_gpiod_get_index(&pdev->dev, "shutdown", 1);
114         if (!IS_ERR(gpio)) {
115                 ret = gpiod_direction_output(gpio, 0);
116                 if (ret)
117                         return ret;
118                 rfkill->shutdown_gpio = gpio;
119         }
120 
121         /* Make sure at-least one of the GPIO is defined and that
122          * a name is specified for this instance
123          */
124         if ((!rfkill->reset_gpio && !rfkill->shutdown_gpio) || !rfkill->name) {
125                 dev_err(&pdev->dev, "invalid platform data\n");
126                 return -EINVAL;
127         }
128 
129         rfkill->rfkill_dev = rfkill_alloc(rfkill->name, &pdev->dev,
130                                           rfkill->type, &rfkill_gpio_ops,
131                                           rfkill);
132         if (!rfkill->rfkill_dev)
133                 return -ENOMEM;
134 
135         ret = rfkill_register(rfkill->rfkill_dev);
136         if (ret < 0)
137                 goto err_destroy;
138 
139         platform_set_drvdata(pdev, rfkill);
140 
141         dev_info(&pdev->dev, "%s device registered.\n", rfkill->name);
142 
143         return 0;
144 
145 err_destroy:
146         rfkill_destroy(rfkill->rfkill_dev);
147 
148         return ret;
149 }
150 
151 static int rfkill_gpio_remove(struct platform_device *pdev)
152 {
153         struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
154 
155         rfkill_unregister(rfkill->rfkill_dev);
156         rfkill_destroy(rfkill->rfkill_dev);
157 
158         return 0;
159 }
160 
161 #ifdef CONFIG_ACPI
162 static const struct acpi_device_id rfkill_acpi_match[] = {
163         { "BCM2E1A", RFKILL_TYPE_BLUETOOTH },
164         { "BCM2E39", RFKILL_TYPE_BLUETOOTH },
165         { "BCM2E3D", RFKILL_TYPE_BLUETOOTH },
166         { "BCM4752", RFKILL_TYPE_GPS },
167         { "LNV4752", RFKILL_TYPE_GPS },
168         { },
169 };
170 #endif
171 
172 static struct platform_driver rfkill_gpio_driver = {
173         .probe = rfkill_gpio_probe,
174         .remove = rfkill_gpio_remove,
175         .driver = {
176                 .name = "rfkill_gpio",
177                 .owner = THIS_MODULE,
178                 .acpi_match_table = ACPI_PTR(rfkill_acpi_match),
179         },
180 };
181 
182 module_platform_driver(rfkill_gpio_driver);
183 
184 MODULE_DESCRIPTION("gpio rfkill");
185 MODULE_AUTHOR("NVIDIA");
186 MODULE_LICENSE("GPL");
187 

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