ENGR00238281 MX6SL_EVK: Add rfkill interface to bluetooth

MX6SL EVK board uses Silex SX-SDMAN board for bluetooth.
Add rfkill interface to control SX-SDMAN reset.
The reset signal is required before using bluetooth.

Signed-off-by: Lionel Xu <R63889@freescale.com>

6 files changed, 209 insertions, 3 deletions

diff --git a/arch/arm/configs/imx6s_defconfig b/arch/arm/configs/imx6s_defconfig
index 0c980c9e5f77..7620cab69c61 100644
--- a/arch/arm/configs/imx6s_defconfig
+++ b/arch/arm/configs/imx6s_defconfig
@@ -336,6 +336,7 @@ CONFIG_ARCH_MXC_AUDMUX_V2=y
 CONFIG_IRAM_ALLOC=y
 CONFIG_CLK_DEBUG=y
 CONFIG_DMA_ZONE_SIZE=184
+CONFIG_MACH_IMX_BLUETOOTH_RFKILL=y
 
 #
 # System MMU
diff --git a/arch/arm/mach-mx6/Kconfig b/arch/arm/mach-mx6/Kconfig
index e7a3580094e3..fac4d050ef98 100644
--- a/arch/arm/mach-mx6/Kconfig
+++ b/arch/arm/mach-mx6/Kconfig
@@ -312,4 +312,10 @@ config MX6_CLK_FOR_BOOTUI_TRANS
 	 avoid setting IPU related clocks' parents when initializing clock tree
 	 so that bootloader splashimage can transition to kernel smoothly.
 
+config MACH_IMX_BLUETOOTH_RFKILL
+       tristate "i.MX 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-mx6/Makefile b/arch/arm/mach-mx6/Makefile
index 6310673a4fe4..f26ac15a996c 100644
--- a/arch/arm/mach-mx6/Makefile
+++ b/arch/arm/mach-mx6/Makefile
@@ -19,4 +19,5 @@ obj-$(CONFIG_SMP) += plat_hotplug.o platsmp.o headsmp.o
 obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
 obj-$(CONFIG_IMX_PCIE) += pcie.o
 obj-$(CONFIG_USB_FSL_ARC_OTG) += usb_dr.o
-obj-$(CONFIG_USB_EHCI_ARC_H1) += usb_h1.o
\ No newline at end of file
+obj-$(CONFIG_USB_EHCI_ARC_H1) += usb_h1.o
+obj-$(CONFIG_MACH_IMX_BLUETOOTH_RFKILL) += mx6_bt_rfkill.o
diff --git a/arch/arm/mach-mx6/board-mx6sl_common.h b/arch/arm/mach-mx6/board-mx6sl_common.h
index 1170cb631ed3..2b2dd6b93c9a 100644
--- a/arch/arm/mach-mx6/board-mx6sl_common.h
+++ b/arch/arm/mach-mx6/board-mx6sl_common.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2012-2013 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
@@ -85,6 +85,8 @@
 /* CSI */
 #define MX6SL_BRD_CSI_PWDN		IMX_GPIO_NR(1, 25)
 #define MX6SL_BRD_CSI_RST		IMX_GPIO_NR(1, 26)
+/* bt */
+#define MX6SL_BRD_BT_RESET		IMX_GPIO_NR(5, 11)
 
 static iomux_v3_cfg_t mx6sl_brd_pads[] = {
 
diff --git a/arch/arm/mach-mx6/board-mx6sl_evk.c b/arch/arm/mach-mx6/board-mx6sl_evk.c
index 46bacc1dc457..ad759eff2428 100644
--- a/arch/arm/mach-mx6/board-mx6sl_evk.c
+++ b/arch/arm/mach-mx6/board-mx6sl_evk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright (C) 2012-2013 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
@@ -61,6 +61,7 @@
 #include <mach/iomux-mx6sl.h>
 #include <mach/imx-uart.h>
 #include <mach/viv_gpu.h>
+#include <mach/imx_rfkill.h>
 
 #include <asm/irq.h>
 #include <asm/setup.h>
@@ -1415,6 +1416,32 @@ static void __init uart2_init(void)
 	imx6sl_add_imx_uart(1, &mx6sl_evk_uart1_data);
 }
 
+static void mx6sl_evk_bt_reset(void)
+{
+	gpio_request(MX6SL_BRD_BT_RESET, "bt-reset");
+	gpio_direction_output(MX6SL_BRD_BT_RESET, 0);
+	/* pull down reset pin at least >5ms */
+	mdelay(6);
+	/* pull up after power supply BT */
+	gpio_set_value(MX6SL_BRD_BT_RESET, 1);
+	gpio_free(MX6SL_BRD_BT_RESET);
+}
+
+static int mx6sl_evk_bt_power_change(int status)
+{
+	if (status)
+		mx6sl_evk_bt_reset();
+	return 0;
+}
+
+static struct platform_device mxc_bt_rfkill = {
+	.name = "mxc_bt_rfkill",
+};
+
+static struct imx_bt_rfkill_platform_data mxc_bt_rfkill_data = {
+	.power_change = mx6sl_evk_bt_power_change,
+};
+
 static void mx6sl_evk_suspend_enter()
 {
 	iomux_v3_cfg_t *p = suspend_enter_pads;
@@ -1542,6 +1569,8 @@ static void __init mx6_evk_init(void)
 	if (uart2_enabled)
 		uart2_init();
 
+	mxc_register_device(&mxc_bt_rfkill, &mxc_bt_rfkill_data);
+
 	imx6q_add_viim();
 	imx6q_add_imx2_wdt(0, NULL);
 
diff --git a/arch/arm/mach-mx6/mx6_bt_rfkill.c b/arch/arm/mach-mx6/mx6_bt_rfkill.c
new file mode 100644
index 000000000000..3b256e954884
--- /dev/null
+++ b/arch/arm/mach-mx6/mx6_bt_rfkill.c
@@ -0,0 +1,167 @@
+/*
+ * Copyright (C) 2012-2013 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 mx6_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/suspend.h>
+#include <linux/init.h>
+#include <linux/rfkill.h>
+#include <mach/hardware.h>
+#include <mach/imx_rfkill.h>
+
+static int system_in_suspend;
+
+static int mxc_bt_set_block(void *rfkdata, bool blocked)
+{
+	struct imx_bt_rfkill_platform_data *data = rfkdata;
+	int ret;
+
+	/* Bluetooth stack will reset the bluetooth chip during
+	 * resume, since we keep bluetooth's power during suspend,
+	 * don't let rfkill to actually reset the chip. */
+	if (system_in_suspend)
+		return 0;
+	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_power_event(struct notifier_block *this,
+			      unsigned long event, void *dummy)
+{
+	switch (event) {
+	case PM_SUSPEND_PREPARE:
+		system_in_suspend = 1;
+		/* going to suspend, don't reset chip */
+		break;
+	case PM_POST_SUSPEND:
+		system_in_suspend = 0;
+		/* System is resume, can reset chip */
+		break;
+	default:
+		break;
+	}
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block mxc_bt_power_notifier = {
+	.notifier_call = mxc_bt_power_event,
+};
+
+static int mxc_bt_rfkill_probe(struct platform_device *dev)
+{
+	int rc;
+	struct rfkill *rfk;
+
+	struct imx_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;
+	}
+
+	rc = register_pm_notifier(&mxc_bt_power_notifier);
+	if (rc)
+		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;
+	}
+
+	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 imx_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_driver = {
+	.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_driver);
+}
+
+module_init(mxc_bt_rfkill_init);
+
+static void __exit mxc_bt_rfkill_exit(void)
+{
+	platform_driver_unregister(&mxc_bt_rfkill_driver);
+}
+
+module_exit(mxc_bt_rfkill_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("RFKill control interface of BT on MX6 Platform");