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Linux/net/rfkill/rfkill-regulator.c

  1 /*
  2  * rfkill-regulator.c - Regulator consumer driver for rfkill
  3  *
  4  * Copyright (C) 2009  Guiming Zhuo <gmzhuo@gmail.com>
  5  * Copyright (C) 2011  Antonio Ospite <ospite@studenti.unina.it>
  6  *
  7  * Implementation inspired by leds-regulator driver.
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  *
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/err.h>
 17 #include <linux/slab.h>
 18 #include <linux/platform_device.h>
 19 #include <linux/regulator/consumer.h>
 20 #include <linux/rfkill.h>
 21 #include <linux/rfkill-regulator.h>
 22 
 23 struct rfkill_regulator_data {
 24         struct rfkill *rf_kill;
 25         bool reg_enabled;
 26 
 27         struct regulator *vcc;
 28 };
 29 
 30 static int rfkill_regulator_set_block(void *data, bool blocked)
 31 {
 32         struct rfkill_regulator_data *rfkill_data = data;
 33         int ret = 0;
 34 
 35         pr_debug("%s: blocked: %d\n", __func__, blocked);
 36 
 37         if (blocked) {
 38                 if (rfkill_data->reg_enabled) {
 39                         regulator_disable(rfkill_data->vcc);
 40                         rfkill_data->reg_enabled = false;
 41                 }
 42         } else {
 43                 if (!rfkill_data->reg_enabled) {
 44                         ret = regulator_enable(rfkill_data->vcc);
 45                         if (!ret)
 46                                 rfkill_data->reg_enabled = true;
 47                 }
 48         }
 49 
 50         pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
 51                 regulator_is_enabled(rfkill_data->vcc));
 52 
 53         return ret;
 54 }
 55 
 56 static struct rfkill_ops rfkill_regulator_ops = {
 57         .set_block = rfkill_regulator_set_block,
 58 };
 59 
 60 static int rfkill_regulator_probe(struct platform_device *pdev)
 61 {
 62         struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
 63         struct rfkill_regulator_data *rfkill_data;
 64         struct regulator *vcc;
 65         struct rfkill *rf_kill;
 66         int ret = 0;
 67 
 68         if (pdata == NULL) {
 69                 dev_err(&pdev->dev, "no platform data\n");
 70                 return -ENODEV;
 71         }
 72 
 73         if (pdata->name == NULL || pdata->type == 0) {
 74                 dev_err(&pdev->dev, "invalid name or type in platform data\n");
 75                 return -EINVAL;
 76         }
 77 
 78         vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
 79         if (IS_ERR(vcc)) {
 80                 dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
 81                 ret = PTR_ERR(vcc);
 82                 goto out;
 83         }
 84 
 85         rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
 86         if (rfkill_data == NULL) {
 87                 ret = -ENOMEM;
 88                 goto err_data_alloc;
 89         }
 90 
 91         rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
 92                                 pdata->type,
 93                                 &rfkill_regulator_ops, rfkill_data);
 94         if (rf_kill == NULL) {
 95                 ret = -ENOMEM;
 96                 goto err_rfkill_alloc;
 97         }
 98 
 99         if (regulator_is_enabled(vcc)) {
100                 dev_dbg(&pdev->dev, "Regulator already enabled\n");
101                 rfkill_data->reg_enabled = true;
102         }
103         rfkill_data->vcc = vcc;
104         rfkill_data->rf_kill = rf_kill;
105 
106         ret = rfkill_register(rf_kill);
107         if (ret) {
108                 dev_err(&pdev->dev, "Cannot register rfkill device\n");
109                 goto err_rfkill_register;
110         }
111 
112         platform_set_drvdata(pdev, rfkill_data);
113         dev_info(&pdev->dev, "%s initialized\n", pdata->name);
114 
115         return 0;
116 
117 err_rfkill_register:
118         rfkill_destroy(rf_kill);
119 err_rfkill_alloc:
120         kfree(rfkill_data);
121 err_data_alloc:
122         regulator_put(vcc);
123 out:
124         return ret;
125 }
126 
127 static int rfkill_regulator_remove(struct platform_device *pdev)
128 {
129         struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
130         struct rfkill *rf_kill = rfkill_data->rf_kill;
131 
132         rfkill_unregister(rf_kill);
133         rfkill_destroy(rf_kill);
134         regulator_put(rfkill_data->vcc);
135         kfree(rfkill_data);
136 
137         return 0;
138 }
139 
140 static struct platform_driver rfkill_regulator_driver = {
141         .probe = rfkill_regulator_probe,
142         .remove = rfkill_regulator_remove,
143         .driver = {
144                 .name = "rfkill-regulator",
145                 .owner = THIS_MODULE,
146         },
147 };
148 
149 module_platform_driver(rfkill_regulator_driver);
150 
151 MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
152 MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
153 MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
154 MODULE_LICENSE("GPL");
155 MODULE_ALIAS("platform:rfkill-regulator");
156 

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