5 files changed, 414 insertions, 1 deletions
diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
index 7fce6dfd218..78efe895b66 100644
--- a/net/rfkill/Kconfig
+++ b/net/rfkill/Kconfig
@@ -22,3 +22,23 @@ config RFKILL_INPUT
 	depends on RFKILL
 	depends on INPUT = y || RFKILL = INPUT
 	default y if !EXPERT
+
+config RFKILL_REGULATOR
+	tristate "Generic rfkill regulator driver"
+	depends on RFKILL || !RFKILL
+	depends on REGULATOR
+	help
+          This options enable controlling radio transmitters connected to
+          voltage regulator using the regulator framework.
+
+          To compile this driver as a module, choose M here: the module will
+          be called rfkill-regulator.
+
+config RFKILL_GPIO
+	tristate "GPIO RFKILL driver"
+	depends on RFKILL && GPIOLIB && HAVE_CLK
+	default n
+	help
+	  If you say yes here you get support of a generic gpio RFKILL
+	  driver. The platform should fill in the appropriate fields in the
+	  rfkill_gpio_platform_data structure and pass that to the driver.
diff --git a/net/rfkill/Makefile b/net/rfkill/Makefile
index 66210535269..311768783f4 100644
--- a/net/rfkill/Makefile
+++ b/net/rfkill/Makefile
@@ -5,3 +5,5 @@
 rfkill-y			+= core.o
 rfkill-$(CONFIG_RFKILL_INPUT)	+= input.o
 obj-$(CONFIG_RFKILL)		+= rfkill.o
+obj-$(CONFIG_RFKILL_REGULATOR)	+= rfkill-regulator.o
+obj-$(CONFIG_RFKILL_GPIO)	+= rfkill-gpio.o
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 0198191b756..be90640a277 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1024,7 +1024,6 @@ static int rfkill_fop_open(struct inode *inode, struct file *file)
 	 * start getting events from elsewhere but hold mtx to get
 	 * startup events added first
 	 */
-	list_add(&data->list, &rfkill_fds);
 
 	list_for_each_entry(rfkill, &rfkill_list, node) {
 		ev = kzalloc(sizeof(*ev), GFP_KERNEL);
@@ -1033,6 +1032,7 @@ static int rfkill_fop_open(struct inode *inode, struct file *file)
 		rfkill_fill_event(&ev->ev, rfkill, RFKILL_OP_ADD);
 		list_add_tail(&ev->list, &data->events);
 	}
+	list_add(&data->list, &rfkill_fds);
 	mutex_unlock(&data->mtx);
 	mutex_unlock(&rfkill_global_mutex);
 
diff --git a/net/rfkill/rfkill-gpio.c b/net/rfkill/rfkill-gpio.c
new file mode 100644
index 00000000000..256c5ddd2d7
--- /dev/null
+++ b/net/rfkill/rfkill-gpio.c
@@ -0,0 +1,227 @@
+/*
+ * 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");
diff --git a/net/rfkill/rfkill-regulator.c b/net/rfkill/rfkill-regulator.c
new file mode 100644
index 00000000000..18dc512a10f
--- /dev/null
+++ b/net/rfkill/rfkill-regulator.c
@@ -0,0 +1,164 @@
+/*
+ * rfkill-regulator.c - Regulator consumer driver for rfkill
+ *
+ * Copyright (C) 2009  Guiming Zhuo <gmzhuo@gmail.com>
+ * Copyright (C) 2011  Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * Implementation inspired by leds-regulator driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/rfkill.h>
+#include <linux/rfkill-regulator.h>
+
+struct rfkill_regulator_data {
+	struct rfkill *rf_kill;
+	bool reg_enabled;
+
+	struct regulator *vcc;
+};
+
+static int rfkill_regulator_set_block(void *data, bool blocked)
+{
+	struct rfkill_regulator_data *rfkill_data = data;
+
+	pr_debug("%s: blocked: %d\n", __func__, blocked);
+
+	if (blocked) {
+		if (rfkill_data->reg_enabled) {
+			regulator_disable(rfkill_data->vcc);
+			rfkill_data->reg_enabled = 0;
+		}
+	} else {
+		if (!rfkill_data->reg_enabled) {
+			regulator_enable(rfkill_data->vcc);
+			rfkill_data->reg_enabled = 1;
+		}
+	}
+
+	pr_debug("%s: regulator_is_enabled after set_block: %d\n", __func__,
+		regulator_is_enabled(rfkill_data->vcc));
+
+	return 0;
+}
+
+struct rfkill_ops rfkill_regulator_ops = {
+	.set_block = rfkill_regulator_set_block,
+};
+
+static int __devinit rfkill_regulator_probe(struct platform_device *pdev)
+{
+	struct rfkill_regulator_platform_data *pdata = pdev->dev.platform_data;
+	struct rfkill_regulator_data *rfkill_data;
+	struct regulator *vcc;
+	struct rfkill *rf_kill;
+	int ret = 0;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -ENODEV;
+	}
+
+	if (pdata->name == NULL || pdata->type == 0) {
+		dev_err(&pdev->dev, "invalid name or type in platform data\n");
+		return -EINVAL;
+	}
+
+	vcc = regulator_get_exclusive(&pdev->dev, "vrfkill");
+	if (IS_ERR(vcc)) {
+		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
+		ret = PTR_ERR(vcc);
+		goto out;
+	}
+
+	rfkill_data = kzalloc(sizeof(*rfkill_data), GFP_KERNEL);
+	if (rfkill_data == NULL) {
+		ret = -ENOMEM;
+		goto err_data_alloc;
+	}
+
+	rf_kill = rfkill_alloc(pdata->name, &pdev->dev,
+				pdata->type,
+				&rfkill_regulator_ops, rfkill_data);
+	if (rf_kill == NULL) {
+		dev_err(&pdev->dev, "Cannot alloc rfkill device\n");
+		ret = -ENOMEM;
+		goto err_rfkill_alloc;
+	}
+
+	if (regulator_is_enabled(vcc)) {
+		dev_dbg(&pdev->dev, "Regulator already enabled\n");
+		rfkill_data->reg_enabled = 1;
+	}
+	rfkill_data->vcc = vcc;
+	rfkill_data->rf_kill = rf_kill;
+
+	ret = rfkill_register(rf_kill);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot register rfkill device\n");
+		goto err_rfkill_register;
+	}
+
+	platform_set_drvdata(pdev, rfkill_data);
+	dev_info(&pdev->dev, "%s initialized\n", pdata->name);
+
+	return 0;
+
+err_rfkill_register:
+	rfkill_destroy(rf_kill);
+err_rfkill_alloc:
+	kfree(rfkill_data);
+err_data_alloc:
+	regulator_put(vcc);
+out:
+	return ret;
+}
+
+static int __devexit rfkill_regulator_remove(struct platform_device *pdev)
+{
+	struct rfkill_regulator_data *rfkill_data = platform_get_drvdata(pdev);
+	struct rfkill *rf_kill = rfkill_data->rf_kill;
+
+	rfkill_unregister(rf_kill);
+	rfkill_destroy(rf_kill);
+	regulator_put(rfkill_data->vcc);
+	kfree(rfkill_data);
+
+	return 0;
+}
+
+static struct platform_driver rfkill_regulator_driver = {
+	.probe = rfkill_regulator_probe,
+	.remove = __devexit_p(rfkill_regulator_remove),
+	.driver = {
+		.name = "rfkill-regulator",
+		.owner = THIS_MODULE,
+	},
+};
+
+static int __init rfkill_regulator_init(void)
+{
+	return platform_driver_register(&rfkill_regulator_driver);
+}
+module_init(rfkill_regulator_init);
+
+static void __exit rfkill_regulator_exit(void)
+{
+	platform_driver_unregister(&rfkill_regulator_driver);
+}
+module_exit(rfkill_regulator_exit);
+
+MODULE_AUTHOR("Guiming Zhuo <gmzhuo@gmail.com>");
+MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
+MODULE_DESCRIPTION("Regulator consumer driver for rfkill");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:rfkill-regulator");