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Linux/net/rfkill/rfkill-gpio.c

  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         char                    *reset_name;
 40         char                    *shutdown_name;
 41         struct clk              *clk;
 42 
 43         bool                    clk_enabled;
 44 };
 45 
 46 static 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 
 67 static const struct rfkill_ops rfkill_gpio_ops = {
 68         .set_block = rfkill_gpio_set_power,
 69 };
 70 
 71 static 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 
 86 static 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 
174 static 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 
187 static const struct acpi_device_id rfkill_acpi_match[] = {
188         { "BCM4752", RFKILL_TYPE_GPS },
189         { },
190 };
191 
192 static 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 
202 module_platform_driver(rfkill_gpio_driver);
203 
204 MODULE_DESCRIPTION("gpio rfkill");
205 MODULE_AUTHOR("NVIDIA");
206 MODULE_LICENSE("GPL");
207 

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