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|
This patch adds a lot of sysfs entries for the different GPIO lines.
It allows me to poke at different parts of the hardware to see what
happens. This allowed me to discover the Bluetooth cutoff switch for
example.
Index: linux-2.6.14/arch/arm/mach-s3c2410/Makefile
===================================================================
--- linux-2.6.14.orig/arch/arm/mach-s3c2410/Makefile
+++ linux-2.6.14/arch/arm/mach-s3c2410/Makefile
@@ -42,3 +42,5 @@ obj-$(CONFIG_MACH_VR1000) += mach-vr1000
obj-$(CONFIG_MACH_RX3715) += mach-rx3715.o
obj-$(CONFIG_MACH_OTOM) += mach-otom.o
obj-$(CONFIG_MACH_NEXCODER_2440) += mach-nexcoder.o
+
+obj-y += gpio-sysfs.o
Index: linux-2.6.14/arch/arm/mach-s3c2410/gpio-sysfs.c
===================================================================
--- /dev/null
+++ linux-2.6.14/arch/arm/mach-s3c2410/gpio-sysfs.c
@@ -0,0 +1,232 @@
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/backlight.h>
+#include <linux/notifier.h>
+#include <linux/ctype.h>
+#include <linux/err.h>
+#include <linux/fb.h>
+#include <asm/bug.h>
+
+#include <asm/arch/regs-gpio.h>
+
+#include <asm/arch/regs-clock.h>
+
+static ssize_t s3c2410_gpio_name_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n", pdev->id);
+}
+
+static ssize_t s3c2410_gpio_val_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+
+ return snprintf(buf, PAGE_SIZE, "%d\n",
+ s3c2410_gpio_getpin(pdev->id) ? 1 : 0);
+}
+
+static ssize_t s3c2410_gpio_val_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ int val;
+ char *endp;
+
+ val = simple_strtoul(buf, &endp, 0);
+ if (*endp && !isspace(*endp))
+ return -EINVAL;
+
+ s3c2410_gpio_setpin(pdev->id, val ? 1 : 0);
+
+ return count;
+}
+
+static DEVICE_ATTR(name, 0444,
+ s3c2410_gpio_name_show,
+ NULL);
+
+static DEVICE_ATTR(val, 0666,
+ s3c2410_gpio_val_show,
+ s3c2410_gpio_val_store);
+
+
+static int __init s3c2410_gpio_probe(struct device *dev)
+{
+ device_create_file(dev, &dev_attr_name);
+ device_create_file(dev, &dev_attr_val);
+ return 0;
+}
+
+static int s3c2410_gpio_remove(struct device *dev)
+{
+ return 0;
+}
+
+static struct device_driver s3c2410_gpio_driver = {
+ .name = "s3c2410-gpio",
+ .bus = &platform_bus_type,
+ .probe = s3c2410_gpio_probe,
+ .remove = s3c2410_gpio_remove,
+};
+
+static struct platform_device s3c_device_gpio[32 * 8];
+
+static ssize_t s3c2410_clkslow_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long clkslow = __raw_readl(S3C2410_CLKSLOW);
+
+ return snprintf(buf, PAGE_SIZE, "0x%08lx\n", clkslow);
+}
+
+static ssize_t s3c2410_clkslow_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+ char *endp;
+
+ val = simple_strtoul(buf, &endp, 0);
+ if (*endp && !isspace(*endp))
+ return -EINVAL;
+
+ printk("CLKSLOW <= 0x%lx\n", val);
+
+ __raw_writel(val, S3C2410_CLKSLOW);
+
+ return count;
+}
+
+static DEVICE_ATTR(clkslow, 0666,
+ s3c2410_clkslow_show,
+ s3c2410_clkslow_store);
+
+static ssize_t s3c2410_clkcon_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long clkclkcon = __raw_readl(S3C2410_CLKCON);
+
+ return snprintf(buf, PAGE_SIZE, "0x%08lx\n", clkclkcon);
+}
+
+static ssize_t s3c2410_clkcon_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+ char *endp;
+
+ val = simple_strtoul(buf, &endp, 0);
+ if (*endp && !isspace(*endp))
+ return -EINVAL;
+
+ printk("CLKCON <= 0x%lx\n", val);
+
+ __raw_writel(val, S3C2410_CLKCON);
+
+ return count;
+}
+
+static DEVICE_ATTR(clkcon, 0666,
+ s3c2410_clkcon_show,
+ s3c2410_clkcon_store);
+
+static ssize_t s3c2410_misccr_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ unsigned long misccr = __raw_readl(S3C2410_MISCCR);
+
+ return snprintf(buf, PAGE_SIZE, "0x%08lx\n", misccr);
+}
+
+static ssize_t s3c2410_misccr_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ unsigned long val;
+ char *endp;
+
+ val = simple_strtoul(buf, &endp, 0);
+ if (*endp && !isspace(*endp))
+ return -EINVAL;
+
+ printk("MISCCR <= 0x%lx\n", val);
+
+ __raw_writel(val, S3C2410_MISCCR);
+
+ return count;
+}
+
+static DEVICE_ATTR(misccr, 0666,
+ s3c2410_misccr_show,
+ s3c2410_misccr_store);
+
+static int __init s3c2410_regs_probe(struct device *dev)
+{
+ device_create_file(dev, &dev_attr_clkslow);
+ device_create_file(dev, &dev_attr_clkcon);
+ device_create_file(dev, &dev_attr_misccr);
+ return 0;
+}
+
+static int s3c2410_regs_remove(struct device *dev)
+{
+ return 0;
+}
+
+
+static struct device_driver s3c2410_regs_driver = {
+ .name = "s3c2410-regs",
+ .bus = &platform_bus_type,
+ .probe = s3c2410_regs_probe,
+ .remove = s3c2410_regs_remove,
+};
+
+static struct platform_device s3c_device_regs = {
+ .name = "s3c2410-regs",
+ .id = -1,
+};
+
+static int __init s3c2410_gpio_init(void)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(s3c_device_gpio); i++) {
+ s3c_device_gpio[i].name = "s3c2410-gpio";
+ s3c_device_gpio[i].id = i;
+ platform_device_register(&s3c_device_gpio[i]);
+ }
+
+ driver_register(&s3c2410_gpio_driver);
+ driver_register(&s3c2410_regs_driver);
+
+ platform_device_register(&s3c_device_regs);
+
+ return 0;
+}
+
+static void __exit s3c2410_gpio_cleanup(void)
+{
+ driver_unregister(&s3c2410_regs_driver);
+ driver_unregister(&s3c2410_gpio_driver);
+}
+
+module_init(s3c2410_gpio_init);
+module_exit(s3c2410_gpio_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Christer Weinigel <christer@weinigel.se>");
+MODULE_DESCRIPTION("S3C2410 GPIO Driver");
+
+/*
+ Local variables:
+ compile-command: "make -k -C ../../../.. linux "
+ c-basic-offset: 8
+ End:
+*/
|
