ENGR00137669-2 rfkill: mx53: ath3k rfkill interface.

MX53 SMD board use ath3k Bluetooth Chip.
Add rfkill interface to control AR3K BT's power and reset.
when power on bt, it require to reset BT chip.

Signed-off-by: Zhang Jiejing <jiejing.zhang@freescale.com>

5 files changed, 210 insertions, 1 deletions

diff --git a/arch/arm/mach-mx5/Kconfig b/arch/arm/mach-mx5/Kconfig
index 59c7b2383e15..2dc41de79f15 100644
--- a/arch/arm/mach-mx5/Kconfig
+++ b/arch/arm/mach-mx5/Kconfig
@@ -115,4 +115,9 @@ config SDMA_IRAM
 	help
 	  Support Internal RAM as SDMA buffer or control structures
 
+config MXC_BLUETOOTH_RFKILL
+       tristate "MXC Bluetooth rfkill interface support"
+       depends on RFKILL
+       ---help---
+	Say Y to get the standard rfkill interface of Bluetooth
 endif
diff --git a/arch/arm/mach-mx5/Makefile b/arch/arm/mach-mx5/Makefile
index f5ce5ef91a75..063f609cb0b8 100644
--- a/arch/arm/mach-mx5/Makefile
+++ b/arch/arm/mach-mx5/Makefile
@@ -18,4 +18,4 @@ obj-$(CONFIG_MACH_MX53_SMD) += mx53_smd.o mx53_smd_pmic_da9053.o
 obj-$(CONFIG_MACH_MX53_LOCO) += mx53_loco.o mx53_loco_pmic_da9053.o
 obj-$(CONFIG_MACH_MX50_ARM2) += mx50_arm2.o mx50_arm2_pmic_mc13892.o
 obj-$(CONFIG_MACH_MX50_RDP) += mx50_rdp.o mx50_rdp_pmic_mc13892.o
-
+obj-$(CONFIG_MXC_BLUETOOTH_RFKILL) += mx53_smd_rfkill.o
diff --git a/arch/arm/mach-mx5/mx53_smd.c b/arch/arm/mach-mx5/mx53_smd.c
index e3112b66065b..f1ed62f1e42d 100644
--- a/arch/arm/mach-mx5/mx53_smd.c
+++ b/arch/arm/mach-mx5/mx53_smd.c
@@ -61,6 +61,7 @@
 #include <mach/iomux-mx53.h>
 #include <mach/i2c.h>
 #include <mach/mxc_iim.h>
+#include <mach/mxc_rfkill.h>
 
 #include "crm_regs.h"
 #include "devices.h"
@@ -952,6 +953,44 @@ static struct mxc_spdif_platform_data mxc_spdif_data = {
 	.spdif_clk = NULL,	/* spdif bus clk */
 };
 
+static void mx53_smd_bt_reset(void)
+{
+	gpio_request(MX53_SMD_BT_RESET, "bt-reset");
+	gpio_direction_output(MX53_SMD_BT_RESET, 0);
+	/* pull down reset pin at least >5ms */
+	mdelay(6);
+	/* pull up after power supply BT */
+	gpio_set_value(MX53_SMD_BT_RESET, 1);
+	gpio_free(MX53_SMD_BT_RESET);
+}
+
+static int mx53_smd_bt_power_change(int status)
+{
+	struct regulator *wifi_bt_pwren;
+
+	wifi_bt_pwren = regulator_get(NULL, "wifi_bt");
+	if (IS_ERR(wifi_bt_pwren)) {
+		printk(KERN_ERR "%s: regulator_get error\n", __func__);
+		return -1;
+	}
+
+	if (status) {
+		regulator_enable(wifi_bt_pwren);
+		mx53_smd_bt_reset();
+	} else
+		regulator_disable(wifi_bt_pwren);
+
+	return 0;
+}
+
+static struct platform_device mxc_bt_rfkill = {
+	.name = "mxc_bt_rfkill",
+};
+
+static struct mxc_bt_rfkill_platform_data mxc_bt_rfkill_data = {
+	.power_change = mx53_smd_bt_power_change,
+};
+
 /*!
  * Board specific fixup function. It is called by \b setup_arch() in
  * setup.c file very early on during kernel starts. It allows the user to
@@ -1156,6 +1195,7 @@ static void __init mxc_board_init(void)
 	mx5_usbh1_init();
 	mxc_register_device(&mxc_v4l2_device, NULL);
 	mxc_register_device(&mxc_v4l2out_device, NULL);
+	mxc_register_device(&mxc_bt_rfkill, &mxc_bt_rfkill_data);
 	smd_add_device_buttons();
 }
 
diff --git a/arch/arm/mach-mx5/mx53_smd_rfkill.c b/arch/arm/mach-mx5/mx53_smd_rfkill.c
new file mode 100644
index 000000000000..f0f95a839381
--- /dev/null
+++ b/arch/arm/mach-mx5/mx53_smd_rfkill.c
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * 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.
+ */
+
+/*!
+ * @file mxc_bt_rfkill.c
+ *
+ * @brief This driver is implement a rfkill control interface of bluetooth
+ * chip on i.MX serial boards. Register the power regulator function and
+ * reset function in platform data.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/rfkill.h>
+#include <mach/hardware.h>
+#include <mach/mxc_rfkill.h>
+
+static int mxc_bt_set_block(void *rfkdata, bool blocked)
+{
+	struct mxc_bt_rfkill_platform_data *data = rfkdata;
+	int ret;
+
+	pr_info("rfkill: BT RF going to : %s\n", blocked ? "off" : "on");
+	if (!blocked)
+		ret = data->power_change(1);
+	else
+		ret = data->power_change(0);
+
+	return ret;
+}
+
+static const struct rfkill_ops mxc_bt_rfkill_ops = {
+	.set_block = mxc_bt_set_block,
+};
+
+static int mxc_bt_rfkill_probe(struct platform_device *dev)
+{
+	int rc;
+	struct rfkill *rfk;
+
+	struct mxc_bt_rfkill_platform_data *data = dev->dev.platform_data;
+
+	if (data->power_change == NULL) {
+		rc = -EINVAL;
+		dev_err(&dev->dev, "no power_change function\n");
+		goto error_check_func;
+	}
+
+	rfk = rfkill_alloc("mxc-bt", &dev->dev, RFKILL_TYPE_BLUETOOTH,
+			   &mxc_bt_rfkill_ops, data);
+
+	if (!rfk) {
+		rc = -ENOMEM;
+		goto error_rfk_alloc;
+	}
+
+	rfkill_set_led_trigger_name(rfk, "mxc_bt");
+
+	rc = rfkill_register(rfk);
+	if (rc)
+		goto error_rfkill;
+
+	platform_set_drvdata(dev, rfk);
+	printk(KERN_INFO "mxc_bt_rfkill driver success loaded\n");
+	return 0;
+
+error_rfkill:
+	rfkill_destroy(rfk);
+error_rfk_alloc:
+error_check_func:
+	return rc;
+}
+
+static int __devexit mxc_bt_rfkill_remove(struct platform_device *dev)
+{
+	struct mxc_bt_rfkill_platform_data *data = dev->dev.platform_data;
+	struct rfkill *rfk = platform_get_drvdata(dev);
+
+	platform_set_drvdata(dev, NULL);
+
+	if (rfk) {
+		rfkill_unregister(rfk);
+		rfkill_destroy(rfk);
+	}
+
+	data->power_change(0);
+
+	return 0;
+}
+
+static struct platform_driver mxc_bt_rfkill_drv = {
+	.driver = {
+		.name = "mxc_bt_rfkill",
+	},
+
+	.probe	= mxc_bt_rfkill_probe,
+	.remove = __devexit_p(mxc_bt_rfkill_remove),
+};
+
+static int __init mxc_bt_rfkill_init(void)
+{
+	return platform_driver_register(&mxc_bt_rfkill_drv);
+}
+
+module_init(mxc_bt_rfkill_init);
+
+static void __exit mxc_bt_rfkill_exit(void)
+{
+	platform_driver_unregister(&mxc_bt_rfkill_drv);
+}
+
+module_exit(mxc_bt_rfkill_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("RFKill control interface of BT on MX53 SMD");
diff --git a/arch/arm/plat-mxc/include/mach/mxc_rfkill.h b/arch/arm/plat-mxc/include/mach/mxc_rfkill.h
new file mode 100644
index 000000000000..3a3d41496e15
--- /dev/null
+++ b/arch/arm/plat-mxc/include/mach/mxc_rfkill.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * 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.
+ */
+
+#ifndef MXC_RFKILL_H
+#define MXC_RFKILL_H
+
+struct mxc_bt_rfkill_platform_data {
+	int (*power_change) (int status);
+};
+
+#endif