[PATCH v4 4/4] Input: cyttsp - perform hard reset of the chip during probe
From: Oreste Salerno <hidden>
Date: 2016-01-21 19:21:35
Also in:
linux-devicetree, lkml
Subsystem:
cyttsp touchscreen driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Linus Walleij, Dmitry Torokhov, Linus Torvalds
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 <redacted> --- 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