diff options
| -rw-r--r-- | kernel-devel/linux-device/my_example.patch | 122 | ||||
| -rw-r--r-- | kernel-devel/linux-device/pres_linux-device_en.tex | 5 |
2 files changed, 125 insertions, 2 deletions
diff --git a/kernel-devel/linux-device/my_example.patch b/kernel-devel/linux-device/my_example.patch new file mode 100644 index 0000000..6e66c14 --- /dev/null +++ b/kernel-devel/linux-device/my_example.patch @@ -0,0 +1,122 @@ +diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig +index c779509..43ae42d 100644 +--- a/drivers/misc/Kconfig ++++ b/drivers/misc/Kconfig +@@ -51,6 +51,11 @@ config AD525X_DPOT_SPI + To compile this driver as a module, choose M here: the + module will be called ad525x_dpot-spi. + ++config MY ++ tristate "my driver example" ++ help ++ just an example for a simple driver dummy ++ + config ATMEL_PWM + tristate "Atmel AT32/AT91 PWM support" + depends on HAVE_CLK +diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile +index 3e1d801..614a3a2 100644 +--- a/drivers/misc/Makefile ++++ b/drivers/misc/Makefile +@@ -8,6 +8,7 @@ obj-$(CONFIG_AD525X_DPOT_I2C) += ad525x_dpot-i2c.o + obj-$(CONFIG_AD525X_DPOT_SPI) += ad525x_dpot-spi.o + obj-$(CONFIG_INTEL_MID_PTI) += pti.o + obj-$(CONFIG_ATMEL_PWM) += atmel_pwm.o ++obj-$(CONFIG_MY) += my.o + obj-$(CONFIG_ATMEL_SSC) += atmel-ssc.o + obj-$(CONFIG_ATMEL_TCLIB) += atmel_tclib.o + obj-$(CONFIG_BMP085) += bmp085.o +diff --git a/drivers/misc/my.c b/drivers/misc/my.c +new file mode 100644 +index 0000000..49759ad +--- /dev/null ++++ b/drivers/misc/my.c +@@ -0,0 +1,88 @@ ++#include <linux/init.h> ++#include <linux/device.h> ++#include <linux/module.h> ++#include <linux/kernel.h> ++#include <linux/slab.h> ++#include <linux/types.h> ++ ++#define DEVICE_NAME "mydev" ++static struct class *dummy; ++ ++static ssize_t my_show_ro(struct device *my_dev, ++ struct device_attribute *my_attr, char *buf) ++{ ++ return scnprintf(buf, PAGE_SIZE, "%s\n", "show some cool value"); ++} ++ ++static ssize_t my_show_rw(struct device *my_dev, ++ struct device_attribute *my_attr, char *buf) ++{ ++ return scnprintf(buf, PAGE_SIZE, "%s\n", "write value and look at dmesg"); ++} ++ ++static ssize_t my_store_rw(struct device *my_dev, ++ struct device_attribute *my_attr, const char *buf, size_t count) ++{ ++ printk(KERN_ERR "my_store_rw: %s", buf); ++ return count; ++} ++ ++static DEVICE_ATTR(ro, S_IRUGO, my_show_ro, NULL); ++static DEVICE_ATTR(rw, S_IWUSR | S_IRUGO, my_show_rw, my_store_rw); ++ ++static struct attribute *my_dev_attrs[] = { ++ &dev_attr_ro.attr, ++ &dev_attr_rw.attr, ++ NULL, ++}; ++ ++static struct attribute_group my_dev_attr_group = { ++ .attrs = my_dev_attrs, ++}; ++ ++static const struct attribute_group *my_dev_attr_groups[] = { ++ &my_dev_attr_group, ++ NULL, ++}; ++ ++static struct device my_dev = { ++ .init_name = "mydevice", ++}; ++ ++static int __init my_init(void) ++{ ++ int ret = 0; ++ ++ dummy = class_create(THIS_MODULE, "dummy"); ++ device_initialize(&my_dev); ++ my_dev.groups = my_dev_attr_groups; ++ my_dev.parent = NULL; ++ my_dev.bus = NULL; ++ my_dev.class = dummy; ++ ret = device_add(&my_dev); ++ if (ret) { ++ printk(KERN_ERR "my: device register failed\n"); ++ goto failed_dev; ++ } ++ return 0; ++ ++failed_dev: ++ device_del(&my_dev); ++ class_destroy(dummy); ++ ++ return ret; ++} ++ ++static void __exit my_exit(void) ++{ ++ device_del(&my_dev); ++ class_destroy(dummy); ++} ++ ++MODULE_AUTHOR("Manuel Traut"); ++MODULE_DESCRIPTION("just my example"); ++MODULE_VERSION("20120412"); ++MODULE_LICENSE("GPL"); ++ ++module_init(my_init); ++module_exit(my_exit); diff --git a/kernel-devel/linux-device/pres_linux-device_en.tex b/kernel-devel/linux-device/pres_linux-device_en.tex index 1b87bc7..c234b36 100644 --- a/kernel-devel/linux-device/pres_linux-device_en.tex +++ b/kernel-devel/linux-device/pres_linux-device_en.tex @@ -174,6 +174,7 @@ these fields should be initialized before calling the register function: \item parent \item name \item bus +\item class \end{itemize} \end{frame} @@ -203,8 +204,8 @@ Attributes can be exported to sysfs by the device driver. \begin{lstlisting}[frame=trBL] my.c: ... -static DEVICE_ATTR(ro, 0444, my_show_ro, NULL); -static DEVICE_ATTR(rw, 0644, my_show_rw, my_store_rw); +static DEVICE_ATTR(ro_example, 0444, my_show_ro, NULL); +static DEVICE_ATTR(rw_example, 0644, my_show_rw, my_store_rw); static struct attribute *my_dev_attrs[] = { &dev_attr_ro.attr, |