mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-26 14:22:03 +02:00
51b1102e98
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11366 3c298f89-4303-0410-b956-a3cf2f4a3e73
179 lines
4.1 KiB
Diff
179 lines
4.1 KiB
Diff
--- a/drivers/w1/masters/Kconfig
|
|
+++ b/drivers/w1/masters/Kconfig
|
|
@@ -42,5 +42,15 @@
|
|
in HP iPAQ devices like h5xxx, h2200, and ASIC3-based like
|
|
hx4700.
|
|
|
|
+config W1_MASTER_GPIO
|
|
+ tristate "GPIO 1-wire busmaster"
|
|
+ depends on GENERIC_GPIO
|
|
+ help
|
|
+ Say Y here if you want to communicate with your 1-wire devices using
|
|
+ GPIO pins. This driver uses the GPIO API to control the wire.
|
|
+
|
|
+ This support is also available as a module. If so, the module
|
|
+ will be called w1-gpio.ko.
|
|
+
|
|
endmenu
|
|
|
|
--- a/drivers/w1/masters/Makefile
|
|
+++ b/drivers/w1/masters/Makefile
|
|
@@ -6,3 +6,4 @@
|
|
obj-$(CONFIG_W1_MASTER_DS2490) += ds2490.o
|
|
obj-$(CONFIG_W1_MASTER_DS2482) += ds2482.o
|
|
obj-$(CONFIG_W1_MASTER_DS1WM) += ds1wm.o
|
|
+obj-$(CONFIG_W1_MASTER_GPIO) += w1-gpio.o
|
|
--- /dev/null
|
|
+++ b/drivers/w1/masters/w1-gpio.c
|
|
@@ -0,0 +1,124 @@
|
|
+/*
|
|
+ * w1-gpio - GPIO w1 bus master driver
|
|
+ *
|
|
+ * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
+ * it under the terms of the GNU General Public License version 2
|
|
+ * as published by the Free Software Foundation.
|
|
+ */
|
|
+
|
|
+#include <linux/init.h>
|
|
+#include <linux/module.h>
|
|
+#include <linux/platform_device.h>
|
|
+#include <linux/w1-gpio.h>
|
|
+
|
|
+#include "../w1.h"
|
|
+#include "../w1_int.h"
|
|
+
|
|
+#include <asm/gpio.h>
|
|
+
|
|
+static void w1_gpio_write_bit_dir(void *data, u8 bit)
|
|
+{
|
|
+ struct w1_gpio_platform_data *pdata = data;
|
|
+
|
|
+ if (bit)
|
|
+ gpio_direction_input(pdata->pin);
|
|
+ else
|
|
+ gpio_direction_output(pdata->pin, 0);
|
|
+}
|
|
+
|
|
+static void w1_gpio_write_bit_val(void *data, u8 bit)
|
|
+{
|
|
+ struct w1_gpio_platform_data *pdata = data;
|
|
+
|
|
+ gpio_set_value(pdata->pin, bit);
|
|
+}
|
|
+
|
|
+static u8 w1_gpio_read_bit(void *data)
|
|
+{
|
|
+ struct w1_gpio_platform_data *pdata = data;
|
|
+
|
|
+ return gpio_get_value(pdata->pin);
|
|
+}
|
|
+
|
|
+static int __init w1_gpio_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct w1_bus_master *master;
|
|
+ struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
|
|
+ int err;
|
|
+
|
|
+ if (!pdata)
|
|
+ return -ENXIO;
|
|
+
|
|
+ master = kzalloc(sizeof(struct w1_bus_master), GFP_KERNEL);
|
|
+ if (!master)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ err = gpio_request(pdata->pin, "w1");
|
|
+ if (err)
|
|
+ goto free_master;
|
|
+
|
|
+ master->data = pdata;
|
|
+ master->read_bit = w1_gpio_read_bit;
|
|
+
|
|
+ if (pdata->is_open_drain) {
|
|
+ gpio_direction_output(pdata->pin, 1);
|
|
+ master->write_bit = w1_gpio_write_bit_val;
|
|
+ } else {
|
|
+ gpio_direction_input(pdata->pin);
|
|
+ master->write_bit = w1_gpio_write_bit_dir;
|
|
+ }
|
|
+
|
|
+ err = w1_add_master_device(master);
|
|
+ if (err)
|
|
+ goto free_gpio;
|
|
+
|
|
+ platform_set_drvdata(pdev, master);
|
|
+
|
|
+ return 0;
|
|
+
|
|
+ free_gpio:
|
|
+ gpio_free(pdata->pin);
|
|
+ free_master:
|
|
+ kfree(master);
|
|
+
|
|
+ return err;
|
|
+}
|
|
+
|
|
+static int __exit w1_gpio_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct w1_bus_master *master = platform_get_drvdata(pdev);
|
|
+ struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
|
|
+
|
|
+ w1_remove_master_device(master);
|
|
+ gpio_free(pdata->pin);
|
|
+ kfree(master);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+static struct platform_driver w1_gpio_driver = {
|
|
+ .driver = {
|
|
+ .name = "w1-gpio",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+ .remove = __exit_p(w1_gpio_remove),
|
|
+};
|
|
+
|
|
+static int __init w1_gpio_init(void)
|
|
+{
|
|
+ return platform_driver_probe(&w1_gpio_driver, w1_gpio_probe);
|
|
+}
|
|
+
|
|
+static void __exit w1_gpio_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&w1_gpio_driver);
|
|
+}
|
|
+
|
|
+module_init(w1_gpio_init);
|
|
+module_exit(w1_gpio_exit);
|
|
+
|
|
+MODULE_DESCRIPTION("GPIO w1 bus master driver");
|
|
+MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
|
|
+MODULE_LICENSE("GPL");
|
|
--- /dev/null
|
|
+++ b/include/linux/w1-gpio.h
|
|
@@ -0,0 +1,23 @@
|
|
+/*
|
|
+ * w1-gpio interface to platform code
|
|
+ *
|
|
+ * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
|
|
+ *
|
|
+ * This program is free software; you can redistribute it and/or modify
|
|
+ * it under the terms of the GNU General Public License version 2
|
|
+ * as published by the Free Software Foundation.
|
|
+ */
|
|
+#ifndef _LINUX_W1_GPIO_H
|
|
+#define _LINUX_W1_GPIO_H
|
|
+
|
|
+/**
|
|
+ * struct w1_gpio_platform_data - Platform-dependent data for w1-gpio
|
|
+ * @pin: GPIO pin to use
|
|
+ * @is_open_drain: GPIO pin is configured as open drain
|
|
+ */
|
|
+struct w1_gpio_platform_data {
|
|
+ unsigned int pin;
|
|
+ unsigned int is_open_drain:1;
|
|
+};
|
|
+
|
|
+#endif /* _LINUX_W1_GPIO_H */
|