ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / rfkill / rfkill-gpio.c
blob256c5ddd2d7238a6e1a19fd4997b067029404cbd
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>
28 #include <linux/rfkill-gpio.h>
30 enum rfkill_gpio_clk_state {
31 UNSPECIFIED = 0,
32 PWR_ENABLED,
33 PWR_DISABLED
36 #define PWR_CLK_SET(_RF, _EN) \
37 ((_RF)->pwr_clk_enabled = (!(_EN) ? PWR_ENABLED : PWR_DISABLED))
38 #define PWR_CLK_ENABLED(_RF) ((_RF)->pwr_clk_enabled == PWR_ENABLED)
39 #define PWR_CLK_DISABLED(_RF) ((_RF)->pwr_clk_enabled != PWR_ENABLED)
41 struct rfkill_gpio_data {
42 struct rfkill_gpio_platform_data *pdata;
43 struct rfkill *rfkill_dev;
44 char *reset_name;
45 char *shutdown_name;
46 enum rfkill_gpio_clk_state pwr_clk_enabled;
47 struct clk *pwr_clk;
50 static int rfkill_gpio_set_power(void *data, bool blocked)
52 struct rfkill_gpio_data *rfkill = data;
54 if (blocked) {
55 if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
56 gpio_direction_output(rfkill->pdata->shutdown_gpio, 0);
57 if (gpio_is_valid(rfkill->pdata->reset_gpio))
58 gpio_direction_output(rfkill->pdata->reset_gpio, 0);
59 if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
60 clk_disable(rfkill->pwr_clk);
61 } else {
62 if (rfkill->pwr_clk && PWR_CLK_DISABLED(rfkill))
63 clk_enable(rfkill->pwr_clk);
64 if (gpio_is_valid(rfkill->pdata->reset_gpio))
65 gpio_direction_output(rfkill->pdata->reset_gpio, 1);
66 if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
67 gpio_direction_output(rfkill->pdata->shutdown_gpio, 1);
70 if (rfkill->pwr_clk)
71 PWR_CLK_SET(rfkill, blocked);
73 return 0;
76 static const struct rfkill_ops rfkill_gpio_ops = {
77 .set_block = rfkill_gpio_set_power,
80 static int rfkill_gpio_probe(struct platform_device *pdev)
82 struct rfkill_gpio_data *rfkill;
83 struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
84 int ret = 0;
85 int len = 0;
87 if (!pdata) {
88 pr_warn("%s: No platform data specified\n", __func__);
89 return -EINVAL;
92 /* make sure at-least one of the GPIO is defined and that
93 * a name is specified for this instance */
94 if (!pdata->name || (!gpio_is_valid(pdata->reset_gpio) &&
95 !gpio_is_valid(pdata->shutdown_gpio))) {
96 pr_warn("%s: invalid platform data\n", __func__);
97 return -EINVAL;
100 rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
101 if (!rfkill)
102 return -ENOMEM;
104 rfkill->pdata = pdata;
106 len = strlen(pdata->name);
107 rfkill->reset_name = kzalloc(len + 7, GFP_KERNEL);
108 if (!rfkill->reset_name) {
109 ret = -ENOMEM;
110 goto fail_alloc;
113 rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL);
114 if (!rfkill->shutdown_name) {
115 ret = -ENOMEM;
116 goto fail_reset_name;
119 snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name);
120 snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name);
122 if (pdata->power_clk_name) {
123 rfkill->pwr_clk = clk_get(&pdev->dev, pdata->power_clk_name);
124 if (IS_ERR(rfkill->pwr_clk)) {
125 pr_warn("%s: can't find pwr_clk.\n", __func__);
126 goto fail_shutdown_name;
130 if (gpio_is_valid(pdata->reset_gpio)) {
131 ret = gpio_request(pdata->reset_gpio, rfkill->reset_name);
132 if (ret) {
133 pr_warn("%s: failed to get reset gpio.\n", __func__);
134 goto fail_clock;
138 if (gpio_is_valid(pdata->shutdown_gpio)) {
139 ret = gpio_request(pdata->shutdown_gpio, rfkill->shutdown_name);
140 if (ret) {
141 pr_warn("%s: failed to get shutdown gpio.\n", __func__);
142 goto fail_reset;
146 rfkill->rfkill_dev = rfkill_alloc(pdata->name, &pdev->dev, pdata->type,
147 &rfkill_gpio_ops, rfkill);
148 if (!rfkill->rfkill_dev)
149 goto fail_shutdown;
151 ret = rfkill_register(rfkill->rfkill_dev);
152 if (ret < 0)
153 goto fail_rfkill;
155 platform_set_drvdata(pdev, rfkill);
157 dev_info(&pdev->dev, "%s device registered.\n", pdata->name);
159 return 0;
161 fail_rfkill:
162 rfkill_destroy(rfkill->rfkill_dev);
163 fail_shutdown:
164 if (gpio_is_valid(pdata->shutdown_gpio))
165 gpio_free(pdata->shutdown_gpio);
166 fail_reset:
167 if (gpio_is_valid(pdata->reset_gpio))
168 gpio_free(pdata->reset_gpio);
169 fail_clock:
170 if (rfkill->pwr_clk)
171 clk_put(rfkill->pwr_clk);
172 fail_shutdown_name:
173 kfree(rfkill->shutdown_name);
174 fail_reset_name:
175 kfree(rfkill->reset_name);
176 fail_alloc:
177 kfree(rfkill);
179 return ret;
182 static int rfkill_gpio_remove(struct platform_device *pdev)
184 struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
186 rfkill_unregister(rfkill->rfkill_dev);
187 rfkill_destroy(rfkill->rfkill_dev);
188 if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
189 gpio_free(rfkill->pdata->shutdown_gpio);
190 if (gpio_is_valid(rfkill->pdata->reset_gpio))
191 gpio_free(rfkill->pdata->reset_gpio);
192 if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
193 clk_disable(rfkill->pwr_clk);
194 if (rfkill->pwr_clk)
195 clk_put(rfkill->pwr_clk);
196 kfree(rfkill->shutdown_name);
197 kfree(rfkill->reset_name);
198 kfree(rfkill);
200 return 0;
203 static struct platform_driver rfkill_gpio_driver = {
204 .probe = rfkill_gpio_probe,
205 .remove = __devexit_p(rfkill_gpio_remove),
206 .driver = {
207 .name = "rfkill_gpio",
208 .owner = THIS_MODULE,
212 static int __init rfkill_gpio_init(void)
214 return platform_driver_register(&rfkill_gpio_driver);
217 static void __exit rfkill_gpio_exit(void)
219 platform_driver_unregister(&rfkill_gpio_driver);
222 module_init(rfkill_gpio_init);
223 module_exit(rfkill_gpio_exit);
225 MODULE_DESCRIPTION("gpio rfkill");
226 MODULE_AUTHOR("NVIDIA");
227 MODULE_LICENSE("GPL");