diff mbox series

[v3,1/2] Input: iqs5xx - make reset GPIO optional

Message ID 20210323021006.367-1-jeff@labundy.com
State Accepted
Commit 9d41359caca7cdc6d3011ba4e485e89d40505e81
Headers show
Series [v3,1/2] Input: iqs5xx - make reset GPIO optional | expand

Commit Message

Jeff LaBundy March 23, 2021, 2:10 a.m. UTC 
The device's hardware reset pin is only required if the platform
must be able to update the device's firmware.

As such, demote the reset GPIO to optional in support of devices
that ship with pre-programmed firmware and don't route the reset
pin back to the SoC.

In that case, the 'fw_file' attribute is hidden because there is
no way to open the bootloader. The logic is extended to the case
in which the device does not advertise bootloader support in the
first place.

Last but not least, remove the hardware reset performed at probe
because there is no reason to reset the device manually. A power
on reset function already ensures a clean reset at start-up.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
---
Changes in v3:
 - Added iqs5xx_attr_is_visible() in place of conditionally registering
   one of two attribute groups

Changes in v2:
 - None

 drivers/input/touchscreen/iqs5xx.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

--
2.17.1
diff mbox series

Patch

diff --git a/drivers/input/touchscreen/iqs5xx.c b/drivers/input/touchscreen/iqs5xx.c
index a990c176abf7..b3fa71213d60 100644
--- a/drivers/input/touchscreen/iqs5xx.c
+++ b/drivers/input/touchscreen/iqs5xx.c
@@ -835,9 +835,6 @@  static int iqs5xx_fw_file_write(struct i2c_client *client, const char *fw_file)
 	int error, error_init = 0;
 	u8 *pmap;

-	if (iqs5xx->dev_id_info.bl_status == IQS5XX_BL_STATUS_NONE)
-		return -EPERM;
-
 	pmap = kzalloc(IQS5XX_PMAP_LEN, GFP_KERNEL);
 	if (!pmap)
 		return -ENOMEM;
@@ -963,7 +960,22 @@  static struct attribute *iqs5xx_attrs[] = {
 	NULL,
 };

+static umode_t iqs5xx_attr_is_visible(struct kobject *kobj,
+				      struct attribute *attr, int i)
+{
+	struct device *dev = kobj_to_dev(kobj);
+	struct iqs5xx_private *iqs5xx = dev_get_drvdata(dev);
+
+	if (attr == &dev_attr_fw_file.attr &&
+	    (iqs5xx->dev_id_info.bl_status == IQS5XX_BL_STATUS_NONE ||
+	    !iqs5xx->reset_gpio))
+		return 0;
+
+	return attr->mode;
+}
+
 static const struct attribute_group iqs5xx_attr_group = {
+	.is_visible = iqs5xx_attr_is_visible,
 	.attrs = iqs5xx_attrs,
 };

@@ -1020,8 +1032,8 @@  static int iqs5xx_probe(struct i2c_client *client,
 	i2c_set_clientdata(client, iqs5xx);
 	iqs5xx->client = client;

-	iqs5xx->reset_gpio = devm_gpiod_get(&client->dev,
-					    "reset", GPIOD_OUT_LOW);
+	iqs5xx->reset_gpio = devm_gpiod_get_optional(&client->dev,
+						     "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(iqs5xx->reset_gpio)) {
 		error = PTR_ERR(iqs5xx->reset_gpio);
 		dev_err(&client->dev, "Failed to request GPIO: %d\n", error);
@@ -1030,9 +1042,6 @@  static int iqs5xx_probe(struct i2c_client *client,

 	mutex_init(&iqs5xx->lock);

-	iqs5xx_reset(client);
-	usleep_range(10000, 10100);
-
 	error = iqs5xx_dev_init(client);
 	if (error)
 		return error;