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w1: add dual search support 

Some 1-wire device need to be search twice to be detected

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Jean-Christophe PLAGNIOL-VILLARD 2013-01-28 23:23:00 +01:00 committed by Sascha Hauer
parent 8d5faa862c
commit 0c30d94b91
3 changed files with 33 additions and 1 deletions
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5
drivers/w1/Kconfig
View File

@ -11,4 +11,9 @@ if W1
source drivers/w1/masters/Kconfig
source drivers/w1/slaves/Kconfig
config W1_DUAL_SEARCH
bool "dual search"
---help---
Some device need to be searched twice to be detected
endif # W1

27
drivers/w1/w1.c
View File

@ -402,6 +402,21 @@ struct bus_type w1_bustype= {
.remove = w1_bus_remove,
};
static bool w1_is_registered(struct w1_bus *bus, u64 rn)
{
struct device_d *dev = NULL;
struct w1_device *w1_dev;
bus_for_each_device(&w1_bustype, dev) {
w1_dev = to_w1_device(dev);
if (w1_dev->bus == bus && w1_dev->reg_num == rn)
return true;
}
return false;
}
static int w1_device_register(struct w1_bus *bus, struct w1_device *dev)
{
char str[18];
@ -442,9 +457,15 @@ int w1_driver_register(struct w1_driver *drv)
void w1_found(struct w1_bus *bus, u64 rn)
{
struct w1_device *dev = xzalloc(sizeof(*dev));
struct w1_device *dev;
u64 tmp = be64_to_cpu(rn);
if (IS_ENABLED(CONFIG_W1_DUAL_SEARCH)
&& bus->is_searched && w1_is_registered(bus, rn))
return;
dev = xzalloc(sizeof(*dev));
dev->reg_num = rn;
dev->fid = tmp >> 56;
dev->id = (tmp >> 8) & 0xffffffffffff;
@ -605,7 +626,11 @@ int w1_bus_register(struct w1_bus *bus)
if (ret)
return ret;
bus->is_searched = false;
w1_search(bus, W1_SEARCH);
bus->is_searched = true;
if (IS_ENABLED(CONFIG_W1_DUAL_SEARCH))
w1_search(bus, W1_SEARCH);
return 0;
}

2
drivers/w1/w1.h
View File

@ -133,6 +133,8 @@ struct w1_bus
int max_slave_count, slave_count;
bool is_searched;
void *data;
struct list_head list;
};