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Message-Id: <1475757015-2265-1-git-send-email-robin@protonic.nl>
Date: Thu, 6 Oct 2016 14:30:15 +0200
From: Robin van der Gracht <robin@...tonic.nl>
To: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>
Cc: linux-kernel@...r.kernel.org,
Robin van der Gracht <robin@...tonic.nl>
Subject: [PATCH] auxdisplay: ht16k33: Keyscan function is now optional.
Signed-off-by: Robin van der Gracht <robin@...tonic.nl>
---
.../devicetree/bindings/display/ht16k33.txt | 15 ++-
drivers/auxdisplay/ht16k33.c | 126 +++++++++++----------
2 files changed, 73 insertions(+), 68 deletions(-)
diff --git a/Documentation/devicetree/bindings/display/ht16k33.txt b/Documentation/devicetree/bindings/display/ht16k33.txt
index 8e5b30b..e2c9048 100644
--- a/Documentation/devicetree/bindings/display/ht16k33.txt
+++ b/Documentation/devicetree/bindings/display/ht16k33.txt
@@ -4,18 +4,21 @@ Holtek ht16k33 RAM mapping 16*8 LED controller driver with keyscan
Required properties:
- compatible: "holtek,ht16k33"
- reg: I2C slave address of the chip.
-- interrupt-parent: A phandle pointing to the interrupt controller
- serving the interrupt for this chip.
-- interrupts: Interrupt specification for the key pressed interrupt.
- refresh-rate-hz: Display update interval in HZ.
-- debounce-delay-ms: Debouncing interval time in milliseconds.
-- linux,keymap: The keymap for keys as described in the binding
- document (devicetree/bindings/input/matrix-keymap.txt).
Optional properties:
- linux,no-autorepeat: Disable keyrepeat.
- default-brightness-level: Initial brightness level [0-15] (default: 15).
+- Keypad
+ Supply the 'interrupts' property to enable the keyscan feature.
+ - interrupts: Interrupt specification for the key pressed interrupt.
+ - interrupt-parent: A phandle pointing to the interrupt controller
+ serving the interrupt for this chip.
+ - debounce-delay-ms: Debouncing interval time in milliseconds.
+ - linux,keymap: The keymap for keys as described in the binding
+ document (devicetree/bindings/input/matrix-keymap.txt).
+
Example:
&i2c1 {
diff --git a/drivers/auxdisplay/ht16k33.c b/drivers/auxdisplay/ht16k33.c
index 9c09bbc..5cf8fb4 100644
--- a/drivers/auxdisplay/ht16k33.c
+++ b/drivers/auxdisplay/ht16k33.c
@@ -334,15 +334,71 @@ static struct fb_ops ht16k33_fb_ops = {
.fb_mmap = ht16k33_mmap,
};
+static int ht16k33_register_keypad(struct ht16k33_priv *priv)
+{
+ int rows, cols, err;
+ struct ht16k33_keypad *keypad = &priv->keypad;
+ struct device *dev = &priv->client->dev;
+
+ keypad->dev = devm_input_allocate_device(dev);
+ if (!keypad->dev)
+ return -ENOMEM;
+
+ keypad->dev->name = dev_name(dev);
+ keypad->dev->id.bustype = BUS_I2C;
+ keypad->dev->open = ht16k33_keypad_start;
+ keypad->dev->close = ht16k33_keypad_stop;
+
+ if (!of_get_property(dev->of_node, "linux,no-autorepeat", NULL))
+ __set_bit(EV_REP, keypad->dev->evbit);
+
+ err = of_property_read_u32(dev->of_node, "debounce-delay-ms",
+ &keypad->debounce_ms);
+ if (err) {
+ dev_err(dev, "key debounce delay not specified\n");
+ return err;
+ }
+
+ err = devm_request_threaded_irq(dev, priv->client->irq, NULL,
+ ht16k33_irq_thread,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ DRIVER_NAME, priv);
+ if (err) {
+ dev_err(dev, "Failed to request irq %i\n", priv->client->irq);
+ return err;
+ }
+
+ disable_irq_nosync(priv->client->irq);
+ rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS;
+ cols = HT16K33_MATRIX_KEYPAD_MAX_COLS;
+ err = matrix_keypad_parse_of_params(dev, &rows, &cols);
+ if (err)
+ return err;
+
+ err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL,
+ keypad->dev);
+ if (err) {
+ dev_err(dev, "failed to build keymap\n");
+ return err;
+ }
+
+ input_set_drvdata(keypad->dev, priv);
+ keypad->rows = rows;
+ keypad->cols = cols;
+ keypad->row_shift = get_count_order(cols);
+ INIT_DELAYED_WORK(&keypad->work, ht16k33_keypad_scan);
+
+ return input_register_device(keypad->dev);
+}
+
static int ht16k33_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int err;
- uint32_t rows, cols, dft_brightness;
+ uint32_t dft_brightness;
struct backlight_device *bl;
struct backlight_properties bl_props;
struct ht16k33_priv *priv;
- struct ht16k33_keypad *keypad;
struct ht16k33_fbdev *fbdev;
struct device_node *node = client->dev.of_node;
const char *dev_id = dev_name(&client->dev);
@@ -352,11 +408,6 @@ static int ht16k33_probe(struct i2c_client *client,
return -EIO;
}
- if (client->irq <= 0) {
- dev_err(&client->dev, "No IRQ specified\n");
- return -EINVAL;
- }
-
priv = devm_kzalloc(&client->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -364,7 +415,6 @@ static int ht16k33_probe(struct i2c_client *client,
priv->client = client;
i2c_set_clientdata(client, priv);
fbdev = &priv->fbdev;
- keypad = &priv->keypad;
priv->workqueue = create_singlethread_workqueue(dev_id);
if (priv->workqueue == NULL)
@@ -417,61 +467,12 @@ static int ht16k33_probe(struct i2c_client *client,
goto err_fbdev_info;
/* Keypad */
- keypad->dev = devm_input_allocate_device(&client->dev);
- if (!keypad->dev) {
- err = -ENOMEM;
- goto err_fbdev_unregister;
- }
-
- keypad->dev->name = dev_id;
- keypad->dev->id.bustype = BUS_I2C;
- keypad->dev->open = ht16k33_keypad_start;
- keypad->dev->close = ht16k33_keypad_stop;
-
- if (!of_get_property(node, "linux,no-autorepeat", NULL))
- __set_bit(EV_REP, keypad->dev->evbit);
-
- err = of_property_read_u32(node, "debounce-delay-ms",
- &keypad->debounce_ms);
- if (err) {
- dev_err(&client->dev, "key debounce delay not specified\n");
- goto err_fbdev_unregister;
+ if (client->irq > 0) {
+ err = ht16k33_register_keypad(priv);
+ if (err)
+ goto err_fbdev_unregister;
}
- err = devm_request_threaded_irq(&client->dev, client->irq, NULL,
- ht16k33_irq_thread,
- IRQF_TRIGGER_RISING | IRQF_ONESHOT,
- DRIVER_NAME, priv);
- if (err) {
- dev_err(&client->dev, "irq request failed %d, error %d\n",
- client->irq, err);
- goto err_fbdev_unregister;
- }
-
- disable_irq_nosync(client->irq);
- rows = HT16K33_MATRIX_KEYPAD_MAX_ROWS;
- cols = HT16K33_MATRIX_KEYPAD_MAX_COLS;
- err = matrix_keypad_parse_of_params(&client->dev, &rows, &cols);
- if (err)
- goto err_fbdev_unregister;
-
- err = matrix_keypad_build_keymap(NULL, NULL, rows, cols, NULL,
- keypad->dev);
- if (err) {
- dev_err(&client->dev, "failed to build keymap\n");
- goto err_fbdev_unregister;
- }
-
- input_set_drvdata(keypad->dev, priv);
- keypad->rows = rows;
- keypad->cols = cols;
- keypad->row_shift = get_count_order(cols);
- INIT_DELAYED_WORK(&keypad->work, ht16k33_keypad_scan);
-
- err = input_register_device(keypad->dev);
- if (err)
- goto err_fbdev_unregister;
-
/* Backlight */
memset(&bl_props, 0, sizeof(struct backlight_properties));
bl_props.type = BACKLIGHT_RAW;
@@ -504,7 +505,8 @@ static int ht16k33_probe(struct i2c_client *client,
return 0;
err_keypad_unregister:
- input_unregister_device(keypad->dev);
+ if (priv->keypad.dev)
+ input_unregister_device(priv->keypad.dev);
err_fbdev_unregister:
unregister_framebuffer(fbdev->info);
err_fbdev_info:
--
2.7.4
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