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[PATCH 3/3] Input: cyttsp - add default init function

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When using device trees, it's not possible to assign an init()
function in the platform data.
In case the init function has not been assigned, attempt to
perform a hard reset of the chip, using reset gpio defined in the
platform data / device tree.

Signed-off-by: Oreste Salerno <oreste.salerno@tomtom.com>
---
 drivers/input/touchscreen/cyttsp_core.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
index 54f6e51..e2589d3 100644
--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -238,6 +238,16 @@ static int cyttsp_set_sysinfo_regs(struct cyttsp *ts)
 	return retval;
 }
 
+static void cyttsp_hard_reset(struct cyttsp *ts)
+{
+	if (ts->pdata->reset_gpio) {
+		gpiod_set_value_cansleep(ts->pdata->reset_gpio, 1);
+		msleep(CY_DELAY_DFLT);
+		gpiod_set_value_cansleep(ts->pdata->reset_gpio, 0);
+		msleep(CY_DELAY_DFLT);
+	}
+}
+
 static int cyttsp_soft_reset(struct cyttsp *ts)
 {
 	unsigned long timeout;
@@ -659,6 +669,8 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
 				error);
 			goto err_free_mem;
 		}
+	} else {
+		cyttsp_hard_reset(ts);
 	}
 
 	input_dev->name = pdata->name;
-- 
1.9.1

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[PATCH 0/3] Add device tree support to the cyttsp driver Oreste Salerno <oreste.salerno@tomtom.com> - 2015-12-28 03:50 +0100
  [PATCH 3/3] Input: cyttsp - add default init function Oreste Salerno <oreste.salerno@tomtom.com> - 2015-12-28 03:50 +0100
  [PATCH 1/3] Input: cyttsp - remove unused irq_gpio from platform_data Oreste Salerno <oreste.salerno@tomtom.com> - 2015-12-28 03:50 +0100
  [PATCH 2/3] Input: cyttsp - add device tree support Oreste Salerno <oreste.salerno@tomtom.com> - 2015-12-28 03:50 +0100

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