[ARM] 4359/3: H1940: Add bluetooth support

This patch adds a small driver responsible for configuring the UART used
for the bluetooth chip and for enabling the bluetooth chipset.
Additionnaly, can trigger a led if the H1940 led driver is enabled.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 142 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/h1940-bluetooth.c b/arch/arm/mach-s3c2410/h1940-bluetooth.c
new file mode 100644
index 000000000000..3c48886521e7
--- /dev/null
+++ b/arch/arm/mach-s3c2410/h1940-bluetooth.c
@@ -0,0 +1,142 @@
+/*
+ * arch/arm/mach-s3c2410/h1940-bluetooth.c
+ * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ *	    S3C2410 bluetooth "driver"
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/hardware.h>
+#include <asm/arch/h1940-latch.h>
+
+#define DRV_NAME              "h1940-bt"
+
+#ifdef CONFIG_LEDS_H1940
+DEFINE_LED_TRIGGER(bt_led_trigger);
+#endif
+
+static int state;
+
+/* Bluetooth control */
+static void h1940bt_enable(int on)
+{
+	if (on) {
+#ifdef CONFIG_LEDS_H1940
+		/* flashing Blue */
+		led_trigger_event(bt_led_trigger, LED_HALF);
+#endif
+
+		/* Power on the chip */
+		h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
+		/* Reset the chip */
+		mdelay(10);
+		s3c2410_gpio_setpin(S3C2410_GPH1, 1);
+		mdelay(10);
+		s3c2410_gpio_setpin(S3C2410_GPH1, 0);
+
+		state = 1;
+	}
+	else {
+#ifdef CONFIG_LEDS_H1940
+		led_trigger_event(bt_led_trigger, 0);
+#endif
+
+		s3c2410_gpio_setpin(S3C2410_GPH1, 1);
+		mdelay(10);
+		s3c2410_gpio_setpin(S3C2410_GPH1, 0);
+		mdelay(10);
+		h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
+
+		state = 0;
+	}
+}
+
+static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return snprintf(buf, PAGE_SIZE, "%d\n", state);
+}
+
+static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+{
+	int new_state;
+	char *endp;
+
+	new_state = simple_strtoul(buf, &endp, 0);
+	if (*endp && !isspace(*endp))
+		return -EINVAL;
+
+	h1940bt_enable(new_state);
+
+	return count;
+}
+static DEVICE_ATTR(enable, 0644,
+		h1940bt_show,
+		h1940bt_store);
+
+static int __init h1940bt_probe(struct platform_device *pdev)
+{
+	/* Configures BT serial port GPIOs */
+	s3c2410_gpio_cfgpin(S3C2410_GPH0, S3C2410_GPH0_nCTS0);
+	s3c2410_gpio_pullup(S3C2410_GPH0, 1);
+	s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
+	s3c2410_gpio_pullup(S3C2410_GPH1, 1);
+	s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
+	s3c2410_gpio_pullup(S3C2410_GPH2, 1);
+	s3c2410_gpio_cfgpin(S3C2410_GPH3, S3C2410_GPH3_RXD0);
+	s3c2410_gpio_pullup(S3C2410_GPH3, 1);
+
+#ifdef CONFIG_LEDS_H1940
+	led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
+#endif
+
+	/* disable BT by default */
+	h1940bt_enable(0);
+
+	return device_create_file(&pdev->dev, &dev_attr_enable);
+}
+
+static int h1940bt_remove(struct platform_device *pdev)
+{
+#ifdef CONFIG_LEDS_H1940
+	led_trigger_unregister_simple(bt_led_trigger);
+#endif
+	return 0;
+}
+
+
+static struct platform_driver h1940bt_driver = {
+	.driver		= {
+		.name	= DRV_NAME,
+	},
+	.probe		= h1940bt_probe,
+	.remove		= h1940bt_remove,
+};
+
+
+static int __init h1940bt_init(void)
+{
+	return platform_driver_register(&h1940bt_driver);
+}
+
+static void __exit h1940bt_exit(void)
+{
+	platform_driver_unregister(&h1940bt_driver);
+}
+
+module_init(h1940bt_init);
+module_exit(h1940bt_exit);
+
+MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
+MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
+MODULE_LICENSE("GPL");