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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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7fdc7849d2
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>
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
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* arch/arm/mach-s3c2410/h1940-bluetooth.c
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* Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*
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* S3C2410 bluetooth "driver"
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/leds.h>
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#include <asm/arch/regs-gpio.h>
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#include <asm/hardware.h>
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#include <asm/arch/h1940-latch.h>
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#define DRV_NAME "h1940-bt"
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#ifdef CONFIG_LEDS_H1940
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DEFINE_LED_TRIGGER(bt_led_trigger);
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#endif
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static int state;
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/* Bluetooth control */
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static void h1940bt_enable(int on)
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{
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if (on) {
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#ifdef CONFIG_LEDS_H1940
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/* flashing Blue */
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led_trigger_event(bt_led_trigger, LED_HALF);
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#endif
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/* Power on the chip */
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h1940_latch_control(0, H1940_LATCH_BLUETOOTH_POWER);
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/* Reset the chip */
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mdelay(10);
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s3c2410_gpio_setpin(S3C2410_GPH1, 1);
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mdelay(10);
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s3c2410_gpio_setpin(S3C2410_GPH1, 0);
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state = 1;
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}
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else {
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#ifdef CONFIG_LEDS_H1940
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led_trigger_event(bt_led_trigger, 0);
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#endif
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s3c2410_gpio_setpin(S3C2410_GPH1, 1);
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mdelay(10);
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s3c2410_gpio_setpin(S3C2410_GPH1, 0);
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mdelay(10);
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h1940_latch_control(H1940_LATCH_BLUETOOTH_POWER, 0);
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state = 0;
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}
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}
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static ssize_t h1940bt_show(struct device *dev, struct device_attribute *attr, char *buf)
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{
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return snprintf(buf, PAGE_SIZE, "%d\n", state);
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}
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static ssize_t h1940bt_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
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{
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int new_state;
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char *endp;
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new_state = simple_strtoul(buf, &endp, 0);
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if (*endp && !isspace(*endp))
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return -EINVAL;
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h1940bt_enable(new_state);
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return count;
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}
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static DEVICE_ATTR(enable, 0644,
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h1940bt_show,
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h1940bt_store);
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static int __init h1940bt_probe(struct platform_device *pdev)
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{
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/* Configures BT serial port GPIOs */
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s3c2410_gpio_cfgpin(S3C2410_GPH0, S3C2410_GPH0_nCTS0);
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s3c2410_gpio_pullup(S3C2410_GPH0, 1);
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s3c2410_gpio_cfgpin(S3C2410_GPH1, S3C2410_GPH1_OUTP);
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s3c2410_gpio_pullup(S3C2410_GPH1, 1);
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s3c2410_gpio_cfgpin(S3C2410_GPH2, S3C2410_GPH2_TXD0);
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s3c2410_gpio_pullup(S3C2410_GPH2, 1);
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s3c2410_gpio_cfgpin(S3C2410_GPH3, S3C2410_GPH3_RXD0);
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s3c2410_gpio_pullup(S3C2410_GPH3, 1);
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#ifdef CONFIG_LEDS_H1940
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led_trigger_register_simple("h1940-bluetooth", &bt_led_trigger);
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#endif
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/* disable BT by default */
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h1940bt_enable(0);
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return device_create_file(&pdev->dev, &dev_attr_enable);
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}
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static int h1940bt_remove(struct platform_device *pdev)
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{
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#ifdef CONFIG_LEDS_H1940
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led_trigger_unregister_simple(bt_led_trigger);
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#endif
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return 0;
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}
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static struct platform_driver h1940bt_driver = {
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.driver = {
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.name = DRV_NAME,
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},
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.probe = h1940bt_probe,
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.remove = h1940bt_remove,
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};
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static int __init h1940bt_init(void)
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{
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return platform_driver_register(&h1940bt_driver);
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}
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static void __exit h1940bt_exit(void)
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{
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platform_driver_unregister(&h1940bt_driver);
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}
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module_init(h1940bt_init);
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module_exit(h1940bt_exit);
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MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
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MODULE_DESCRIPTION("Driver for the iPAQ H1940 bluetooth chip");
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MODULE_LICENSE("GPL");
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