wl127x-rfkill: Add power control driver for TI WL127X Bluetooth chips

Signed-off-by: Nick Pelly <npelly@google.com>

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 5baa3fb044c4888fb10a41c43a4cac6587186107..90d76e7d8cc489880f615c136e63efcdbaf17792 100644 (file)
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -261,6 +261,14 @@ config UID_STAT
        bool "UID based statistics tracking exported to /proc/uid_stat"
        default n
 
+config WL127X_RFKILL
+       tristate "Bluetooth power control driver for TI wl127x"
+       depends on RFKILL
+       default n
+       ---help---
+        Creates an rfkill entry in sysfs for power control of Bluetooth
+        TI wl127x chips.
+
 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 5f1c16fbf1db2b6118ff75bbef601ad8fb90a68b..df3fcf264b715274d99ba1f9dfdfeb475030d126 100644 (file)
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -26,3 +26,4 @@ obj-$(CONFIG_UID_STAT)                += uid_stat.o
 obj-$(CONFIG_C2PORT)           += c2port/
 obj-y                          += eeprom/
 obj-y                          += cb710/
+obj-$(CONFIG_WL127X_RFKILL)    += wl127x-rfkill.o

diff --git a/drivers/misc/wl127x-rfkill.c b/drivers/misc/wl127x-rfkill.c
new file mode 100644 (file)
index 0000000..f5b9515
--- /dev/null
+++ b/drivers/misc/wl127x-rfkill.c
@@ -0,0 +1,121 @@
+/*
+ * Bluetooth TI wl127x rfkill power control via GPIO
+ *
+ * Copyright (C) 2009 Motorola, Inc.
+ * Copyright (C) 2008 Texas Instruments
+ * Initial code: Pavan Savoy <pavan.savoy@gmail.com> (wl127x_power.c)
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/rfkill.h>
+#include <linux/platform_device.h>
+#include <linux/wl127x-rfkill.h>
+
+static int wl127x_rfkill_set_power(void *data, enum rfkill_state state)
+{
+       int nshutdown_gpio = (int) data;
+
+       switch (state) {
+       case RFKILL_STATE_UNBLOCKED:
+               gpio_set_value(nshutdown_gpio, 1);
+               break;
+       case RFKILL_STATE_SOFT_BLOCKED:
+               gpio_set_value(nshutdown_gpio, 0);
+               break;
+       default:
+               printk(KERN_ERR "invalid bluetooth rfkill state %d\n", state);
+       }
+       return 0;
+}
+
+static int wl127x_rfkill_probe(struct platform_device *pdev)
+{
+       int rc = 0;
+       struct wl127x_rfkill_platform_data *pdata = pdev->dev.platform_data;
+       enum rfkill_state default_state = RFKILL_STATE_SOFT_BLOCKED;  /* off */
+
+       rc = gpio_request(pdata->nshutdown_gpio, "wl127x_nshutdown_gpio");
+       if (unlikely(rc))
+               return rc;
+
+       rc = gpio_direction_output(pdata->nshutdown_gpio, 0);
+       if (unlikely(rc))
+               return rc;
+
+       rfkill_set_default(RFKILL_TYPE_BLUETOOTH, default_state);
+       wl127x_rfkill_set_power(NULL, default_state);
+
+       pdata->rfkill = rfkill_allocate(&pdev->dev, RFKILL_TYPE_BLUETOOTH);
+       if (unlikely(!pdata->rfkill))
+               return -ENOMEM;
+
+       pdata->rfkill->name = "wl127x";
+       pdata->rfkill->state = default_state;
+       /* userspace cannot take exclusive control */
+       pdata->rfkill->user_claim_unsupported = 1;
+       pdata->rfkill->user_claim = 0;
+       pdata->rfkill->data = (void *) pdata->nshutdown_gpio;
+       pdata->rfkill->toggle_radio = wl127x_rfkill_set_power;
+
+       rc = rfkill_register(pdata->rfkill);
+
+       if (unlikely(rc))
+               rfkill_free(pdata->rfkill);
+
+       return 0;
+}
+
+static int wl127x_rfkill_remove(struct platform_device *pdev)
+{
+       struct wl127x_rfkill_platform_data *pdata = pdev->dev.platform_data;
+
+       rfkill_unregister(pdata->rfkill);
+       rfkill_free(pdata->rfkill);
+       gpio_free(pdata->nshutdown_gpio);
+
+       return 0;
+}
+
+static struct platform_driver wl127x_rfkill_platform_driver = {
+       .probe = wl127x_rfkill_probe,
+       .remove = wl127x_rfkill_remove,
+       .driver = {
+                  .name = "wl127x-rfkill",
+                  .owner = THIS_MODULE,
+                  },
+};
+
+static int __init wl127x_rfkill_init(void)
+{
+       return platform_driver_register(&wl127x_rfkill_platform_driver);
+}
+
+static void __exit wl127x_rfkill_exit(void)
+{
+       platform_driver_unregister(&wl127x_rfkill_platform_driver);
+}
+
+module_init(wl127x_rfkill_init);
+module_exit(wl127x_rfkill_exit);
+
+MODULE_ALIAS("platform:wl127x");
+MODULE_DESCRIPTION("wl127x-rfkill");
+MODULE_AUTHOR("Motorola");
+MODULE_LICENSE("GPL");

diff --git a/include/linux/wl127x-rfkill.h b/include/linux/wl127x-rfkill.h
new file mode 100644 (file)
index 0000000..9057ec6
--- /dev/null
+++ b/include/linux/wl127x-rfkill.h
@@ -0,0 +1,35 @@
+/*
+ * Bluetooth TI wl127x rfkill power control via GPIO
+ *
+ * Copyright (C) 2009 Motorola, Inc.
+ * Copyright (C) 2008 Texas Instruments
+ * Initial code: Pavan Savoy <pavan.savoy@gmail.com> (wl127x_power.c)
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#ifndef _LINUX_WL127X_RFKILL_H
+#define _LINUX_WL127X_RFKILL_H
+
+#include <linux/rfkill.h>
+
+struct wl127x_rfkill_platform_data {
+       int nshutdown_gpio;
+
+       struct rfkill *rfkill;  /* for driver only */
+};
+
+#endif