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authorLinus Walleij <linus.walleij@linaro.org>2021-05-26 16:35:11 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2021-05-26 16:59:00 -0700
commit6cf3b3abbf0b3b778138c0f8936aa7820af62cfc (patch)
tree0696f0bc1507b71483e0eb9f4ccea36fc33815bc /drivers/input
parent007704c99f52e22cd93bcc16c610d7c1a41fd9cd (diff)
Input: cyttsp - obtain regulators
The CYTTSP TMA340 chips have two supplies: VCPIN and VDD for analog and digital voltage respectively. Add some minimal code to obtain and enable these regulators if need be. Reviewed-by: Javier Martinez Canillas <javier@dowhile0.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20210526230352.1433537-3-linus.walleij@linaro.org Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/touchscreen/cyttsp_core.c35
-rw-r--r--drivers/input/touchscreen/cyttsp_core.h2
2 files changed, 37 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
index 106dd4962785..d9debcdeeec7 100644
--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/property.h>
#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
#include "cyttsp_core.h"
@@ -608,6 +609,14 @@ static int cyttsp_parse_properties(struct cyttsp *ts)
return 0;
}
+static void cyttsp_disable_regulators(void *_ts)
+{
+ struct cyttsp *ts = _ts;
+
+ regulator_bulk_disable(ARRAY_SIZE(ts->regulators),
+ ts->regulators);
+}
+
struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
struct device *dev, int irq, size_t xfer_buf_size)
{
@@ -628,6 +637,32 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
ts->bus_ops = bus_ops;
ts->irq = irq;
+ /*
+ * VCPIN is the analog voltage supply
+ * VDD is the digital voltage supply
+ */
+ ts->regulators[0].supply = "vcpin";
+ ts->regulators[1].supply = "vdd";
+ error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->regulators),
+ ts->regulators);
+ if (error) {
+ dev_err(dev, "Failed to get regulators: %d\n", error);
+ return ERR_PTR(error);
+ }
+
+ error = regulator_bulk_enable(ARRAY_SIZE(ts->regulators),
+ ts->regulators);
+ if (error) {
+ dev_err(dev, "Cannot enable regulators: %d\n", error);
+ return ERR_PTR(error);
+ }
+
+ error = devm_add_action_or_reset(dev, cyttsp_disable_regulators, ts);
+ if (error) {
+ dev_err(dev, "failed to install chip disable handler\n");
+ return ERR_PTR(error);
+ }
+
ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(ts->reset_gpio)) {
error = PTR_ERR(ts->reset_gpio);
diff --git a/drivers/input/touchscreen/cyttsp_core.h b/drivers/input/touchscreen/cyttsp_core.h
index 9bc4fe7e6ac5..8eba9d8ba74a 100644
--- a/drivers/input/touchscreen/cyttsp_core.h
+++ b/drivers/input/touchscreen/cyttsp_core.h
@@ -23,6 +23,7 @@
#include <linux/types.h>
#include <linux/device.h>
#include <linux/input/cyttsp.h>
+#include <linux/regulator/consumer.h>
#define CY_NUM_RETRY 16 /* max number of retries for read ops */
@@ -122,6 +123,7 @@ struct cyttsp {
enum cyttsp_state state;
bool suspended;
+ struct regulator_bulk_data regulators[2];
struct gpio_desc *reset_gpio;
bool use_hndshk;
u8 act_dist;