[PATCH v4 4/4] Input: cyttsp - perform hard reset of the chip during probe

Oreste Salerno
2016-01-21T19:21:35Z

Since we removed support for calling an init() callback from
the platform data, introduce a function which initializes
the chip by performing a hard reset, using the reset gpio
defined in the device properties.

Signed-off-by: Oreste Salerno <oreste.salerno@tomtom.com>
---
drivers/input/touchscreen/cyttsp_core.c | 10 ++++++++++
1 file changed, 10 insertions(+)

diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
index 92b459d..19499a6 100644
--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -240,6 +240,14 @@ static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
return retval;
}

+static void cyttsp_hard_reset(struct cyttsp *ts)
+{
+ gpiod_set_value_cansleep(ts->reset_gpio, 1);
+ msleep(CY_DELAY_DFLT);
+ gpiod_set_value_cansleep(ts->reset_gpio, 0);
+ msleep(CY_DELAY_DFLT);
+}
+
static int cyttsp_soft_reset(struct cyttsp *ts)
{
unsigned long timeout;
@@ -668,6 +676,8 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,

disable_irq(ts->irq);

+ cyttsp_hard_reset(ts);
+
error = cyttsp_power_on(ts);
if (error)
return ERR_PTR(error);
--
1.9.1