179 lines
4.2 KiB
Diff
179 lines
4.2 KiB
Diff
--- a/drivers/w1/masters/Kconfig
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+++ b/drivers/w1/masters/Kconfig
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@@ -42,5 +42,15 @@ config W1_MASTER_DS1WM
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in HP iPAQ devices like h5xxx, h2200, and ASIC3-based like
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hx4700.
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+config W1_MASTER_GPIO
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+ tristate "GPIO 1-wire busmaster"
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+ depends on GENERIC_GPIO
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+ help
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+ Say Y here if you want to communicate with your 1-wire devices using
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+ GPIO pins. This driver uses the GPIO API to control the wire.
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+
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+ This support is also available as a module. If so, the module
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+ will be called w1-gpio.ko.
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+
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endmenu
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--- a/drivers/w1/masters/Makefile
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+++ b/drivers/w1/masters/Makefile
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@@ -6,3 +6,4 @@ obj-$(CONFIG_W1_MASTER_MATROX) += matro
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obj-$(CONFIG_W1_MASTER_DS2490) += ds2490.o
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obj-$(CONFIG_W1_MASTER_DS2482) += ds2482.o
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obj-$(CONFIG_W1_MASTER_DS1WM) += ds1wm.o
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+obj-$(CONFIG_W1_MASTER_GPIO) += w1-gpio.o
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--- /dev/null
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+++ b/drivers/w1/masters/w1-gpio.c
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@@ -0,0 +1,124 @@
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+/*
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+ * w1-gpio - GPIO w1 bus master driver
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+ *
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+ * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2
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+ * as published by the Free Software Foundation.
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+ */
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+
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+#include <linux/init.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+#include <linux/w1-gpio.h>
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+
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+#include "../w1.h"
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+#include "../w1_int.h"
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+
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+#include <asm/gpio.h>
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+
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+static void w1_gpio_write_bit_dir(void *data, u8 bit)
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+{
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+ struct w1_gpio_platform_data *pdata = data;
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+
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+ if (bit)
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+ gpio_direction_input(pdata->pin);
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+ else
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+ gpio_direction_output(pdata->pin, 0);
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+}
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+
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+static void w1_gpio_write_bit_val(void *data, u8 bit)
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+{
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+ struct w1_gpio_platform_data *pdata = data;
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+
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+ gpio_set_value(pdata->pin, bit);
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+}
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+
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+static u8 w1_gpio_read_bit(void *data)
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+{
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+ struct w1_gpio_platform_data *pdata = data;
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+
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+ return gpio_get_value(pdata->pin);
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+}
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+
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+static int __init w1_gpio_probe(struct platform_device *pdev)
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+{
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+ struct w1_bus_master *master;
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+ struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
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+ int err;
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+
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+ if (!pdata)
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+ return -ENXIO;
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+
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+ master = kzalloc(sizeof(struct w1_bus_master), GFP_KERNEL);
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+ if (!master)
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+ return -ENOMEM;
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+
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+ err = gpio_request(pdata->pin, "w1");
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+ if (err)
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+ goto free_master;
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+
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+ master->data = pdata;
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+ master->read_bit = w1_gpio_read_bit;
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+
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+ if (pdata->is_open_drain) {
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+ gpio_direction_output(pdata->pin, 1);
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+ master->write_bit = w1_gpio_write_bit_val;
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+ } else {
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+ gpio_direction_input(pdata->pin);
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+ master->write_bit = w1_gpio_write_bit_dir;
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+ }
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+
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+ err = w1_add_master_device(master);
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+ if (err)
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+ goto free_gpio;
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+
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+ platform_set_drvdata(pdev, master);
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+
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+ return 0;
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+
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+ free_gpio:
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+ gpio_free(pdata->pin);
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+ free_master:
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+ kfree(master);
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+
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+ return err;
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+}
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+
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+static int __exit w1_gpio_remove(struct platform_device *pdev)
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+{
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+ struct w1_bus_master *master = platform_get_drvdata(pdev);
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+ struct w1_gpio_platform_data *pdata = pdev->dev.platform_data;
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+
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+ w1_remove_master_device(master);
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+ gpio_free(pdata->pin);
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+ kfree(master);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver w1_gpio_driver = {
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+ .driver = {
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+ .name = "w1-gpio",
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+ .owner = THIS_MODULE,
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+ },
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+ .remove = __exit_p(w1_gpio_remove),
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+};
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+
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+static int __init w1_gpio_init(void)
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+{
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+ return platform_driver_probe(&w1_gpio_driver, w1_gpio_probe);
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+}
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+
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+static void __exit w1_gpio_exit(void)
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+{
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+ platform_driver_unregister(&w1_gpio_driver);
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+}
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+
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+module_init(w1_gpio_init);
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+module_exit(w1_gpio_exit);
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+
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+MODULE_DESCRIPTION("GPIO w1 bus master driver");
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+MODULE_AUTHOR("Ville Syrjala <syrjala@sci.fi>");
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+MODULE_LICENSE("GPL");
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--- /dev/null
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+++ b/include/linux/w1-gpio.h
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@@ -0,0 +1,23 @@
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+/*
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+ * w1-gpio interface to platform code
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+ *
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+ * Copyright (C) 2007 Ville Syrjala <syrjala@sci.fi>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2
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+ * as published by the Free Software Foundation.
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+ */
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+#ifndef _LINUX_W1_GPIO_H
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+#define _LINUX_W1_GPIO_H
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+
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+/**
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+ * struct w1_gpio_platform_data - Platform-dependent data for w1-gpio
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+ * @pin: GPIO pin to use
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+ * @is_open_drain: GPIO pin is configured as open drain
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+ */
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+struct w1_gpio_platform_data {
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+ unsigned int pin;
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+ unsigned int is_open_drain:1;
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+};
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+
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+#endif /* _LINUX_W1_GPIO_H */
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