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authorEvgeny Boger <boger@contactless.ru>2014-01-23 15:56:18 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-01-23 16:37:04 -0800
commit3089a4c8d3abc7e2ab105d1d39d415110d1566d6 (patch)
tree5064f69853949cb8b5d245c932f65a3202d21219 /drivers/w1/masters
parent63509beaf7ed7a9dc8c574be61189fce791489f0 (diff)
drivers/w1/masters/w1-gpio.c: add strong pullup emulation
Strong pullup is emulated by driving pin logic high after write command when using tri-state push-pull GPIO. Signed-off-by: Evgeny Boger <boger@contactless.ru> Cc: Greg KH <greg@kroah.com> Acked-by: David Fries <david@fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/w1/masters')
-rw-r--r--drivers/w1/masters/w1-gpio.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/w1/masters/w1-gpio.c b/drivers/w1/masters/w1-gpio.c
index e36b18b2817b..9709b8b484ba 100644
--- a/drivers/w1/masters/w1-gpio.c
+++ b/drivers/w1/masters/w1-gpio.c
@@ -18,10 +18,31 @@
#include <linux/of_gpio.h>
#include <linux/err.h>
#include <linux/of.h>
+#include <linux/delay.h>
#include "../w1.h"
#include "../w1_int.h"
+static u8 w1_gpio_set_pullup(void *data, int delay)
+{
+ struct w1_gpio_platform_data *pdata = data;
+
+ if (delay) {
+ pdata->pullup_duration = delay;
+ } else {
+ if (pdata->pullup_duration) {
+ gpio_direction_output(pdata->pin, 1);
+
+ msleep(pdata->pullup_duration);
+
+ gpio_direction_input(pdata->pin);
+ }
+ pdata->pullup_duration = 0;
+ }
+
+ return 0;
+}
+
static void w1_gpio_write_bit_dir(void *data, u8 bit)
{
struct w1_gpio_platform_data *pdata = data;
@@ -132,6 +153,7 @@ static int w1_gpio_probe(struct platform_device *pdev)
} else {
gpio_direction_input(pdata->pin);
master->write_bit = w1_gpio_write_bit_dir;
+ master->set_pullup = w1_gpio_set_pullup;
}
err = w1_add_master_device(master);