Add a GPIO 1-wire bus master driver. The driver used the GPIO API to
control the wire and the GPIO pin can be specified using platform data
similar to i2c-gpio. The driver was tested with AT91SAM9260 + DS2401.
Signed-off-by: Ville Syrjala <[EMAIL PROTECTED]>
---
Version 2 of the patch changes the sizeof to use the type as requested.
I also had a better look at i2c-gpio and noticed that I should probably
call gpio_request()/gpio_free(). Those functions are no-ops on mach-at91 but
perhaps some other platforms require them. Also I removed the open-drain
requirement like i2c-gpio does by toggling the pin direction.
Documentation/w1/masters/00-INDEX |2 +
Documentation/w1/masters/w1-gpio | 33 ++
drivers/w1/masters/Kconfig| 10 +++
drivers/w1/masters/Makefile |1 +
drivers/w1/masters/w1-gpio.c | 125 +
include/linux/w1-gpio.h | 23 +++
6 files changed, 194 insertions(+), 0 deletions(-)
create mode 100644 Documentation/w1/masters/w1-gpio
create mode 100644 drivers/w1/masters/w1-gpio.c
create mode 100644 include/linux/w1-gpio.h
diff --git a/Documentation/w1/masters/00-INDEX
b/Documentation/w1/masters/00-INDEX
index 752613c..7b0ceaa 100644
--- a/Documentation/w1/masters/00-INDEX
+++ b/Documentation/w1/masters/00-INDEX
@@ -4,3 +4,5 @@ ds2482
- The Maxim/Dallas Semiconductor DS2482 provides 1-wire busses.
ds2490
- The Maxim/Dallas Semiconductor DS2490 builds USB <-> W1 bridges.
+w1-gpio
+ - GPIO 1-wire bus master driver.
diff --git a/Documentation/w1/masters/w1-gpio b/Documentation/w1/masters/w1-gpio
new file mode 100644
index 000..af5d3b4
--- /dev/null
+++ b/Documentation/w1/masters/w1-gpio
@@ -0,0 +1,33 @@
+Kernel driver w1-gpio
+=
+
+Author: Ville Syrjala <[EMAIL PROTECTED]>
+
+
+Description
+---
+
+GPIO 1-wire bus master driver. The driver uses the GPIO API to control the
+wire and the GPIO pin can be specified using platform data.
+
+
+Example (mach-at91)
+---
+
+#include
+
+static struct w1_gpio_platform_data foo_w1_gpio_pdata = {
+ .pin= AT91_PIN_PB20,
+ .is_open_drain = 1,
+};
+
+static struct platform_device foo_w1_device = {
+ .name = "w1-gpio",
+ .id = -1,
+ .dev.platform_data = &foo_w1_gpio_pdata,
+};
+
+...
+ at91_set_GPIO_periph(foo_w1_gpio_pdata.pin, 1);
+ at91_set_multi_drive(foo_w1_gpio_pdata.pin, 1);
+ platform_device_register(&foo_w1_device);
diff --git a/drivers/w1/masters/Kconfig b/drivers/w1/masters/Kconfig
index 8236d44..c449309 100644
--- a/drivers/w1/masters/Kconfig
+++ b/drivers/w1/masters/Kconfig
@@ -42,5 +42,15 @@ config W1_MASTER_DS1WM
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
diff --git a/drivers/w1/masters/Makefile b/drivers/w1/masters/Makefile
index 11551b3..1420b5b 100644
--- a/drivers/w1/masters/Makefile
+++ b/drivers/w1/masters/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_W1_MASTER_MATROX) += matrox_w1.o
obj-$(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
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
new file mode 100644
index 000..354ee6f
--- /dev/null
+++ b/drivers/w1/masters/w1-gpio.c
@@ -0,0 +1,125 @@
+/*
+ * w1-gpio - GPIO w1 bus master driver
+ *
+ * Copyright (C) 2007 Ville Syrjala <[EMAIL PROTECTED]>
+ *
+ * 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
+#include
+#include
+#include
+
+#include "../w1.h"
+#include "../w1_int.h"
+
+#include
+
+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 = pd
