[linux.git] / net / rfkill / rfkill-gpio.c

/*
 * Copyright (c) 2011, NVIDIA Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rfkill.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>

#include <linux/rfkill-gpio.h>

enum rfkill_gpio_clk_state {
	UNSPECIFIED = 0,
	PWR_ENABLED,
	PWR_DISABLED
};

#define PWR_CLK_SET(_RF, _EN) \
	((_RF)->pwr_clk_enabled = (!(_EN) ? PWR_ENABLED : PWR_DISABLED))
#define PWR_CLK_ENABLED(_RF) ((_RF)->pwr_clk_enabled == PWR_ENABLED)
#define PWR_CLK_DISABLED(_RF) ((_RF)->pwr_clk_enabled != PWR_ENABLED)

struct rfkill_gpio_data {
	struct rfkill_gpio_platform_data	*pdata;
	struct rfkill				*rfkill_dev;
	char					*reset_name;
	char					*shutdown_name;
	enum rfkill_gpio_clk_state		pwr_clk_enabled;
	struct clk				*pwr_clk;
};

static int rfkill_gpio_set_power(void *data, bool blocked)
{
	struct rfkill_gpio_data *rfkill = data;

	if (blocked) {
		if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
			gpio_direction_output(rfkill->pdata->shutdown_gpio, 0);
		if (gpio_is_valid(rfkill->pdata->reset_gpio))
			gpio_direction_output(rfkill->pdata->reset_gpio, 0);
		if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
			clk_disable(rfkill->pwr_clk);
	} else {
		if (rfkill->pwr_clk && PWR_CLK_DISABLED(rfkill))
			clk_enable(rfkill->pwr_clk);
		if (gpio_is_valid(rfkill->pdata->reset_gpio))
			gpio_direction_output(rfkill->pdata->reset_gpio, 1);
		if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
			gpio_direction_output(rfkill->pdata->shutdown_gpio, 1);
	}

	if (rfkill->pwr_clk)
		PWR_CLK_SET(rfkill, blocked);

	return 0;
}

static const struct rfkill_ops rfkill_gpio_ops = {
	.set_block = rfkill_gpio_set_power,
};

static int rfkill_gpio_probe(struct platform_device *pdev)
{
	struct rfkill_gpio_data *rfkill;
	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
	int ret = 0;
	int len = 0;

	if (!pdata) {
		pr_warn("%s: No platform data specified\n", __func__);
		return -EINVAL;
	}

	/* make sure at-least one of the GPIO is defined and that
	 * a name is specified for this instance */
	if (!pdata->name || (!gpio_is_valid(pdata->reset_gpio) &&
		!gpio_is_valid(pdata->shutdown_gpio))) {
		pr_warn("%s: invalid platform data\n", __func__);
		return -EINVAL;
	}

	rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
	if (!rfkill)
		return -ENOMEM;

	rfkill->pdata = pdata;

	len = strlen(pdata->name);
	rfkill->reset_name = kzalloc(len + 7, GFP_KERNEL);
	if (!rfkill->reset_name) {
		ret = -ENOMEM;
		goto fail_alloc;
	}

	rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL);
	if (!rfkill->shutdown_name) {
		ret = -ENOMEM;
		goto fail_reset_name;
	}

	snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name);
	snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name);

	if (pdata->power_clk_name) {
		rfkill->pwr_clk = clk_get(&pdev->dev, pdata->power_clk_name);
		if (IS_ERR(rfkill->pwr_clk)) {
			pr_warn("%s: can't find pwr_clk.\n", __func__);
			goto fail_shutdown_name;
		}
	}

	if (gpio_is_valid(pdata->reset_gpio)) {
		ret = gpio_request(pdata->reset_gpio, rfkill->reset_name);
		if (ret) {
			pr_warn("%s: failed to get reset gpio.\n", __func__);
			goto fail_clock;
		}
	}

	if (gpio_is_valid(pdata->shutdown_gpio)) {
		ret = gpio_request(pdata->shutdown_gpio, rfkill->shutdown_name);
		if (ret) {
			pr_warn("%s: failed to get shutdown gpio.\n", __func__);
			goto fail_reset;
		}
	}

	rfkill->rfkill_dev = rfkill_alloc(pdata->name, &pdev->dev, pdata->type,
				&rfkill_gpio_ops, rfkill);
	if (!rfkill->rfkill_dev)
		goto fail_shutdown;

	ret = rfkill_register(rfkill->rfkill_dev);
	if (ret < 0)
		goto fail_rfkill;

	platform_set_drvdata(pdev, rfkill);

	dev_info(&pdev->dev, "%s device registered.\n", pdata->name);

	return 0;

fail_rfkill:
	rfkill_destroy(rfkill->rfkill_dev);
fail_shutdown:
	if (gpio_is_valid(pdata->shutdown_gpio))
		gpio_free(pdata->shutdown_gpio);
fail_reset:
	if (gpio_is_valid(pdata->reset_gpio))
		gpio_free(pdata->reset_gpio);
fail_clock:
	if (rfkill->pwr_clk)
		clk_put(rfkill->pwr_clk);
fail_shutdown_name:
	kfree(rfkill->shutdown_name);
fail_reset_name:
	kfree(rfkill->reset_name);
fail_alloc:
	kfree(rfkill);

	return ret;
}

static int rfkill_gpio_remove(struct platform_device *pdev)
{
	struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);

	rfkill_unregister(rfkill->rfkill_dev);
	rfkill_destroy(rfkill->rfkill_dev);
	if (gpio_is_valid(rfkill->pdata->shutdown_gpio))
		gpio_free(rfkill->pdata->shutdown_gpio);
	if (gpio_is_valid(rfkill->pdata->reset_gpio))
		gpio_free(rfkill->pdata->reset_gpio);
	if (rfkill->pwr_clk && PWR_CLK_ENABLED(rfkill))
		clk_disable(rfkill->pwr_clk);
	if (rfkill->pwr_clk)
		clk_put(rfkill->pwr_clk);
	kfree(rfkill->shutdown_name);
	kfree(rfkill->reset_name);
	kfree(rfkill);

	return 0;
}

static struct platform_driver rfkill_gpio_driver = {
	.probe = rfkill_gpio_probe,
	.remove = __devexit_p(rfkill_gpio_remove),
	.driver = {
		   .name = "rfkill_gpio",
		   .owner = THIS_MODULE,
	},
};

static int __init rfkill_gpio_init(void)
{
	return platform_driver_register(&rfkill_gpio_driver);
}

static void __exit rfkill_gpio_exit(void)
{
	platform_driver_unregister(&rfkill_gpio_driver);
}

module_init(rfkill_gpio_init);
module_exit(rfkill_gpio_exit);

MODULE_DESCRIPTION("gpio rfkill");
MODULE_AUTHOR("NVIDIA");
MODULE_LICENSE("GPL");
Commit	Line	Data
7176ba23 RK	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
	28	#include <linux/rfkill-gpio.h>
	29
	30	enum rfkill_gpio_clk_state {
	31	UNSPECIFIED = 0,
	32	PWR_ENABLED,
	33	PWR_DISABLED
	34	};
	35
	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)
	40
	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;
	48	};
	49
	50	static int rfkill_gpio_set_power(void *data, bool blocked)
	51	{
	52	struct rfkill_gpio_data *rfkill = data;
	53
	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);
68	}
69
70	if (rfkill->pwr_clk)
71	PWR_CLK_SET(rfkill, blocked);
72
73	return 0;
74	}
75
76	static const struct rfkill_ops rfkill_gpio_ops = {
77	.set_block = rfkill_gpio_set_power,
78	};
79
80	static int rfkill_gpio_probe(struct platform_device *pdev)
81	{
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;
86
87	if (!pdata) {
88	pr_warn("%s: No platform data specified\n", __func__);
89	return -EINVAL;
90	}
91
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;
98	}
99
100	rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL);
101	if (!rfkill)
102	return -ENOMEM;
103
104	rfkill->pdata = pdata;
105
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;
111	}
112
113	rfkill->shutdown_name = kzalloc(len + 10, GFP_KERNEL);
114	if (!rfkill->shutdown_name) {
115	ret = -ENOMEM;
116	goto fail_reset_name;
117	}
118
119	snprintf(rfkill->reset_name, len + 6 , "%s_reset", pdata->name);
120	snprintf(rfkill->shutdown_name, len + 9, "%s_shutdown", pdata->name);
121
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;
127	}
128	}
129
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;
135	}
136	}
137
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;
143	}
144	}
145
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;
150
151	ret = rfkill_register(rfkill->rfkill_dev);
152	if (ret < 0)
153	goto fail_rfkill;
154
155	platform_set_drvdata(pdev, rfkill);
156
157	dev_info(&pdev->dev, "%s device registered.\n", pdata->name);
158
159	return 0;
160
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);
178
179	return ret;
180	}
181
182	static int rfkill_gpio_remove(struct platform_device *pdev)
183	{
184	struct rfkill_gpio_data *rfkill = platform_get_drvdata(pdev);
185
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);
199
200	return 0;
201	}
202
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,
209	},
210	};
211
212	static int __init rfkill_gpio_init(void)
213	{
214	return platform_driver_register(&rfkill_gpio_driver);
215	}
216
217	static void __exit rfkill_gpio_exit(void)
218	{
219	platform_driver_unregister(&rfkill_gpio_driver);
220	}
221
222	module_init(rfkill_gpio_init);
223	module_exit(rfkill_gpio_exit);
224
225	MODULE_DESCRIPTION("gpio rfkill");
226	MODULE_AUTHOR("NVIDIA");
227	MODULE_LICENSE("GPL");