[arm/tegra/bt/rfkill]: bluetooth rfkill driver

A new "rfkill" driver added to control the BT radio.

Bug 724106

Original-Change-Id: I60ce0d188884d17f4f61d378b43368b7b5f9d7a9
(cherry picked from commit 78dbd0a022280964d3e9dcd3f00753ce8d66fa16)
Reviewed-on: http://git-master/r/9955
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>

Rebase-Id: Rac61d26ff1845a0a835c8f93c2bc2f6cefd04ac3

3 files changed, 193 insertions, 0 deletions

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index eedf35a22f5f..40b75d076ae1 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -508,6 +508,12 @@ config USB_SWITCH_FSA9480
 	  stereo and mono audio, video, microphone and UART data to use
 	  a common connector port.
 
+config BCM4329_RFKILL
+	bool "Enable BCM4329 RFKILL driver"
+	default n
+	---help---
+	Adds BCM4329 RFKILL driver for Broadcom BCM4329 chipset
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 00a7b2e015d4..fe2e911a0621 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -48,3 +48,4 @@ obj-y				+= lis3lv02d/
 obj-y				+= carma/
 obj-$(CONFIG_USB_SWITCH_FSA9480) += fsa9480.o
 obj-$(CONFIG_SENSORS_NCT1008)	+= nct1008.o
+obj-$(CONFIG_BCM4329_RFKILL)	+= bcm4329_rfkill.o
diff --git a/drivers/misc/bcm4329_rfkill.c b/drivers/misc/bcm4329_rfkill.c
new file mode 100644
index 000000000000..eeb4047631f3
--- /dev/null
+++ b/drivers/misc/bcm4329_rfkill.c
@@ -0,0 +1,186 @@
+/*
+ * drivers/misc/bcm4329_rfkill.c
+ *
+ * Copyright (c) 2010, 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/err.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/rfkill.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+
+struct bcm4329_rfkill_data {
+	int gpio_reset;
+	int gpio_shutdown;
+	int delay;
+	struct clk *bt_32k_clk;
+};
+
+static struct bcm4329_rfkill_data *bcm4329_rfkill;
+
+static int bcm4329_bt_rfkill_set_power(void *data, bool blocked)
+{
+	if (blocked) {
+		gpio_direction_output(bcm4329_rfkill->gpio_shutdown, 0);
+		gpio_direction_output(bcm4329_rfkill->gpio_reset, 0);
+		if (bcm4329_rfkill->bt_32k_clk)
+			clk_disable(bcm4329_rfkill->bt_32k_clk);
+	} else {
+		if (bcm4329_rfkill->bt_32k_clk)
+			clk_enable(bcm4329_rfkill->bt_32k_clk);
+		gpio_direction_output(bcm4329_rfkill->gpio_shutdown, 1);
+		gpio_direction_output(bcm4329_rfkill->gpio_reset, 1);
+	}
+
+	return 0;
+}
+
+static const struct rfkill_ops bcm4329_bt_rfkill_ops = {
+	.set_block = bcm4329_bt_rfkill_set_power,
+};
+
+static int bcm4329_rfkill_probe(struct platform_device *pdev)
+{
+	struct rfkill *bt_rfkill;
+	struct resource *res;
+	int ret;
+	bool enable = false;  /* off */
+	bool default_sw_block_state;
+
+	bcm4329_rfkill = kzalloc(sizeof(*bcm4329_rfkill), GFP_KERNEL);
+	if (!bcm4329_rfkill)
+		return -ENOMEM;
+
+	bcm4329_rfkill->bt_32k_clk = clk_get(&pdev->dev, "bcm4329_32k_clk");
+	if (IS_ERR(bcm4329_rfkill->bt_32k_clk)) {
+		pr_warn("can't find bcm4329_32k_clk. assuming clock to chip\n");
+		bcm4329_rfkill->bt_32k_clk = NULL;
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_IO,
+						"bcm4329_nreset_gpio");
+	if (!res) {
+		pr_err("couldn't find reset gpio\n");
+		goto free_bcm_32k_clk;
+	}
+	bcm4329_rfkill->gpio_reset = res->start;
+	tegra_gpio_enable(bcm4329_rfkill->gpio_reset);
+	ret = gpio_request(bcm4329_rfkill->gpio_reset,
+					"bcm4329_nreset_gpio");
+	if (unlikely(ret))
+		goto free_bcm_32k_clk;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_IO,
+						"bcm4329_nshutdown_gpio");
+	if (!res) {
+		pr_err("couldn't find shutdown gpio\n");
+		gpio_free(bcm4329_rfkill->gpio_reset);
+		goto free_bcm_32k_clk;
+	}
+	tegra_gpio_enable(bcm4329_rfkill->gpio_shutdown);
+	ret = gpio_request(bcm4329_rfkill->gpio_shutdown,
+					"bcm4329_nshutdown_gpio");
+	if (unlikely(ret)) {
+		gpio_free(bcm4329_rfkill->gpio_reset);
+		goto free_bcm_32k_clk;
+	}
+
+	if (bcm4329_rfkill->bt_32k_clk && enable)
+		clk_enable(bcm4329_rfkill->bt_32k_clk);
+	gpio_direction_output(bcm4329_rfkill->gpio_shutdown, enable);
+	gpio_direction_output(bcm4329_rfkill->gpio_reset, enable);
+
+	bt_rfkill = rfkill_alloc("bcm4329 Bluetooth", &pdev->dev,
+				RFKILL_TYPE_BLUETOOTH, &bcm4329_bt_rfkill_ops,
+				NULL);
+
+	if (unlikely(!bt_rfkill))
+		goto free_bcm_res;
+
+	default_sw_block_state = !enable;
+	rfkill_set_states(bt_rfkill, default_sw_block_state, false);
+
+	ret = rfkill_register(bt_rfkill);
+
+	if (unlikely(ret)) {
+		rfkill_destroy(bt_rfkill);
+		goto free_bcm_res;
+	}
+
+	return 0;
+
+free_bcm_res:
+	gpio_free(bcm4329_rfkill->gpio_shutdown);
+	gpio_free(bcm4329_rfkill->gpio_reset);
+free_bcm_32k_clk:
+	if (bcm4329_rfkill->bt_32k_clk && enable)
+		clk_disable(bcm4329_rfkill->bt_32k_clk);
+	if (bcm4329_rfkill->bt_32k_clk)
+		clk_put(bcm4329_rfkill->bt_32k_clk);
+	kfree(bcm4329_rfkill);
+	return -ENODEV;
+}
+
+static int bcm4329_rfkill_remove(struct platform_device *pdev)
+{
+	struct rfkill *bt_rfkill = platform_get_drvdata(pdev);
+
+	if (bcm4329_rfkill->bt_32k_clk)
+		clk_put(bcm4329_rfkill->bt_32k_clk);
+	rfkill_unregister(bt_rfkill);
+	rfkill_destroy(bt_rfkill);
+	gpio_free(bcm4329_rfkill->gpio_shutdown);
+	gpio_free(bcm4329_rfkill->gpio_reset);
+	kfree(bcm4329_rfkill);
+
+	return 0;
+}
+
+static struct platform_driver bcm4329_rfkill_driver = {
+	.probe = bcm4329_rfkill_probe,
+	.remove = bcm4329_rfkill_remove,
+	.driver = {
+		   .name = "bcm4329_rfkill",
+		   .owner = THIS_MODULE,
+	},
+};
+
+static int __init bcm4329_rfkill_init(void)
+{
+	return platform_driver_register(&bcm4329_rfkill_driver);
+}
+
+static void __exit bcm4329_rfkill_exit(void)
+{
+	platform_driver_unregister(&bcm4329_rfkill_driver);
+}
+
+module_init(bcm4329_rfkill_init);
+module_exit(bcm4329_rfkill_exit);
+
+MODULE_DESCRIPTION("BCM4329 rfkill");
+MODULE_AUTHOR("NVIDIA");
+MODULE_LICENSE("GPL");