summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorEvgeniy Polyakov <johnpol@2ka.mipt.ru>2006-03-23 19:11:58 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2006-06-22 11:22:50 -0700
commitf522d2396138e68bcb9cc5650aa368a81d7f7ff0 (patch)
tree3446d411b996b19094856c5729725e0e43ff4b0e
parent52ab3f3dc711eeccbfbcc5d4f5c5d9b9ff59650f (diff)
downloadtalos-obmc-linux-f522d2396138e68bcb9cc5650aa368a81d7f7ff0.tar.gz
talos-obmc-linux-f522d2396138e68bcb9cc5650aa368a81d7f7ff0.zip
[PATCH] w1: Added default generic read/write operations.
Special file in each w1 slave device's directory called "rw" is created each time new slave and no appropriate w1 family is registered. "rw" file supports read and write operations, which allows to perform almost any kind of operations. Each logical operation is a transaction in nature, which can contain several (two or one) low-level operations. Let's see how one can read EEPROM context: 1. one must write control buffer, i.e. buffer containing command byte and two byte address. At this step bus is reset and appropriate device is selected using either W1_SKIP_ROM or W1_MATCH_ROM command. Then provided control buffer is being written to the wire. 2. reading. This will issue reading eeprom response. It is possible that between 1. and 2. w1 master thread will reset bus for searching and slave device will be even removed, but in this case 0xff will be read, since no device was selected. Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--Documentation/w1/w1.generic18
-rw-r--r--drivers/w1/w1.c69
-rw-r--r--drivers/w1/w1.h2
3 files changed, 84 insertions, 5 deletions
diff --git a/Documentation/w1/w1.generic b/Documentation/w1/w1.generic
index f937fbe1cacb..4c6509dd4789 100644
--- a/Documentation/w1/w1.generic
+++ b/Documentation/w1/w1.generic
@@ -27,8 +27,19 @@ When a w1 master driver registers with the w1 subsystem, the following occurs:
When a device is found on the bus, w1 core checks if driver for it's family is
loaded. If so, the family driver is attached to the slave.
-If there is no driver for the family, a simple sysfs entry is created
-for the slave device.
+If there is no driver for the family, default one is assigned, which allows to perform
+almost any kind of operations. Each logical operation is a transaction
+in nature, which can contain several (two or one) low-level operations.
+Let's see how one can read EEPROM context:
+1. one must write control buffer, i.e. buffer containing command byte
+and two byte address. At this step bus is reset and appropriate device
+is selected using either W1_SKIP_ROM or W1_MATCH_ROM command.
+Then provided control buffer is being written to the wire.
+2. reading. This will issue reading eeprom response.
+
+It is possible that between 1. and 2. w1 master thread will reset bus for searching
+and slave device will be even removed, but in this case 0xff will
+be read, since no device was selected.
W1 device families
@@ -89,4 +100,5 @@ driver - (standard) symlink to the w1 driver
name - the device name, usually the same as the directory name
w1_slave - (optional) a binary file whose meaning depends on the
family driver
-
+rw - (optional) created for slave devices which do not have
+ appropriate family driver. Allows to read/write binary data.
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index a698b517e863..c9486c168505 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -139,7 +139,74 @@ static struct bin_attribute w1_slave_attr_bin_id = {
};
/* Default family */
-static struct w1_family w1_default_family;
+
+static ssize_t w1_default_write(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
+
+ if (down_interruptible(&sl->master->mutex)) {
+ count = 0;
+ goto out;
+ }
+
+ if (w1_reset_select_slave(sl)) {
+ count = 0;
+ goto out_up;
+ }
+
+ w1_write_block(sl->master, buf, count);
+
+out_up:
+ up(&sl->master->mutex);
+out:
+ return count;
+}
+
+static ssize_t w1_default_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
+{
+ struct w1_slave *sl = kobj_to_w1_slave(kobj);
+
+ if (down_interruptible(&sl->master->mutex)) {
+ count = 0;
+ goto out;
+ }
+
+ w1_read_block(sl->master, buf, count);
+
+ up(&sl->master->mutex);
+out:
+ return count;
+}
+
+static struct bin_attribute w1_default_attr = {
+ .attr = {
+ .name = "rw",
+ .mode = S_IRUGO | S_IWUSR,
+ .owner = THIS_MODULE,
+ },
+ .size = PAGE_SIZE,
+ .read = w1_default_read,
+ .write = w1_default_write,
+};
+
+static int w1_default_add_slave(struct w1_slave *sl)
+{
+ return sysfs_create_bin_file(&sl->dev.kobj, &w1_default_attr);
+}
+
+static void w1_default_remove_slave(struct w1_slave *sl)
+{
+ sysfs_remove_bin_file(&sl->dev.kobj, &w1_default_attr);
+}
+
+static struct w1_family_ops w1_default_fops = {
+ .add_slave = w1_default_add_slave,
+ .remove_slave = w1_default_remove_slave,
+};
+
+static struct w1_family w1_default_family = {
+ .fops = &w1_default_fops,
+};
static int w1_uevent(struct device *dev, char **envp, int num_envp, char *buffer, int buffer_size);
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 56980505e6c4..02e8caddfb36 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -60,7 +60,7 @@ struct w1_reg_num
#define W1_READ_PSUPPLY 0xB4
#define W1_MATCH_ROM 0x55
-#define W1_SLAVE_ACTIVE (1<<0)
+#define W1_SLAVE_ACTIVE 0
struct w1_slave
{
OpenPOWER on IntegriCloud