public-mirrors/linux
1
0
Fork 0
mirror of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-08-05 16:54:27 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Input: cyttsp - obtain regulators

Browse source 
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>
This commit is contained in:
Linus Walleij 2021-05-26 16:35:11 -07:00 • committed by Dmitry Torokhov
parent 007704c99f
commit 6cf3b3abbf
2 changed files with 37 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
drivers/input/touchscreen/cyttsp_core.c
View file

@ -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);

2
drivers/input/touchscreen/cyttsp_core.h
View file

@ -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;