@@ -176,6 +176,8 @@ config HT16K33
select FB_SYS_IMAGEBLIT
select INPUT_MATRIXKMAP
select FB_BACKLIGHT
+ select NEW_LEDS
+ select LEDS_CLASS
select LINEDISP
help
Say yes here to add support for Holtek HT16K33, RAM mapping 16*8
@@ -18,6 +18,7 @@
#include <linux/backlight.h>
#include <linux/input.h>
#include <linux/input/matrix_keypad.h>
+#include <linux/leds.h>
#include <linux/workqueue.h>
#include <linux/mm.h>
@@ -34,6 +35,10 @@
#define REG_DISPLAY_SETUP 0x80
#define REG_DISPLAY_SETUP_ON BIT(0)
+#define REG_DISPLAY_SETUP_BLINK_OFF (0 << 1)
+#define REG_DISPLAY_SETUP_BLINK_2HZ (1 << 1)
+#define REG_DISPLAY_SETUP_BLINK_1HZ (2 << 1)
+#define REG_DISPLAY_SETUP_BLINK_0HZ5 (3 << 1)
#define REG_ROWINT_SET 0xA0
#define REG_ROWINT_SET_INT_EN BIT(0)
@@ -94,12 +99,14 @@ struct ht16k33_seg {
struct ht16k33_priv {
struct i2c_client *client;
struct delayed_work work;
+ struct led_classdev led;
struct ht16k33_keypad keypad;
union {
struct ht16k33_fbdev fbdev;
struct ht16k33_seg seg;
};
enum display_type type;
+ uint8_t blink;
};
static const struct fb_fix_screeninfo ht16k33_fb_fix = {
@@ -158,7 +165,7 @@ static DEVICE_ATTR(map_seg14, 0644, map_seg_show, map_seg_store);
static int ht16k33_display_on(struct ht16k33_priv *priv)
{
- uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON;
+ uint8_t data = REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON | priv->blink;
return i2c_smbus_write_byte(priv->client, data);
}
@@ -173,8 +180,10 @@ static int ht16k33_brightness_set(struct ht16k33_priv *priv,
{
int err;
- if (brightness == 0)
+ if (brightness == 0) {
+ priv->blink = REG_DISPLAY_SETUP_BLINK_OFF;
return ht16k33_display_off(priv);
+ }
err = ht16k33_display_on(priv);
if (err)
@@ -184,6 +193,49 @@ static int ht16k33_brightness_set(struct ht16k33_priv *priv,
REG_BRIGHTNESS | (brightness - 1));
}
+static int ht16k33_brightness_set_blocking(struct led_classdev *led_cdev,
+ enum led_brightness brightness)
+{
+ struct ht16k33_priv *priv = container_of(led_cdev, struct ht16k33_priv,
+ led);
+
+ return ht16k33_brightness_set(priv, brightness);
+}
+
+static int ht16k33_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on, unsigned long *delay_off)
+{
+ struct ht16k33_priv *priv = container_of(led_cdev, struct ht16k33_priv,
+ led);
+ unsigned int delay;
+ uint8_t blink;
+ int err;
+
+ if (!*delay_on && !*delay_off) {
+ blink = REG_DISPLAY_SETUP_BLINK_1HZ;
+ delay = 1000;
+ } else if (*delay_on <= 750) {
+ blink = REG_DISPLAY_SETUP_BLINK_2HZ;
+ delay = 500;
+ } else if (*delay_on <= 1500) {
+ blink = REG_DISPLAY_SETUP_BLINK_1HZ;
+ delay = 1000;
+ } else {
+ blink = REG_DISPLAY_SETUP_BLINK_0HZ5;
+ delay = 2000;
+ }
+
+ err = i2c_smbus_write_byte(priv->client,
+ REG_DISPLAY_SETUP | REG_DISPLAY_SETUP_ON |
+ blink);
+ if (err)
+ return err;
+
+ priv->blink = blink;
+ *delay_on = *delay_off = delay;
+ return 0;
+}
+
static void ht16k33_fb_queue(struct ht16k33_priv *priv)
{
struct ht16k33_fbdev *fbdev = &priv->fbdev;
@@ -425,6 +477,35 @@ static void ht16k33_seg14_update(struct work_struct *work)
i2c_smbus_write_i2c_block_data(priv->client, 0, ARRAY_SIZE(buf), buf);
}
+static int ht16k33_led_probe(struct device *dev, struct led_classdev *led,
+ unsigned int brightness)
+{
+ struct led_init_data init_data = {};
+ struct device_node *node;
+ int err;
+
+ /* The LED is optional */
+ node = of_get_child_by_name(dev->of_node, "led");
+ if (!node)
+ return 0;
+
+ init_data.fwnode = of_fwnode_handle(node);
+ init_data.devicename = "auxdisplay";
+ init_data.devname_mandatory = true;
+
+ led->brightness_set_blocking = ht16k33_brightness_set_blocking;
+ led->blink_set = ht16k33_blink_set;
+ led->flags = LED_CORE_SUSPENDRESUME;
+ led->brightness = brightness;
+ led->max_brightness = MAX_BRIGHTNESS;
+
+ err = devm_led_classdev_register_ext(dev, led, &init_data);
+ if (err)
+ dev_err(dev, "Failed to register LED\n");
+
+ return err;
+}
+
static int ht16k33_keypad_probe(struct i2c_client *client,
struct ht16k33_keypad *keypad)
{
@@ -498,24 +579,28 @@ static int ht16k33_fbdev_probe(struct device *dev, struct ht16k33_priv *priv,
uint32_t brightness)
{
struct ht16k33_fbdev *fbdev = &priv->fbdev;
- struct backlight_properties bl_props;
- struct backlight_device *bl;
+ struct backlight_device *bl = NULL;
int err;
- /* Backlight */
- memset(&bl_props, 0, sizeof(struct backlight_properties));
- bl_props.type = BACKLIGHT_RAW;
- bl_props.max_brightness = MAX_BRIGHTNESS;
+ if (!priv->led.dev) {
+ /* backwards compatibility with DT lacking an led subnode */
+ struct backlight_properties bl_props;
- bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev, priv,
- &ht16k33_bl_ops, &bl_props);
- if (IS_ERR(bl)) {
- dev_err(dev, "failed to register backlight\n");
- return PTR_ERR(bl);
- }
+ memset(&bl_props, 0, sizeof(struct backlight_properties));
+ bl_props.type = BACKLIGHT_RAW;
+ bl_props.max_brightness = MAX_BRIGHTNESS;
+
+ bl = devm_backlight_device_register(dev, DRIVER_NAME"-bl", dev,
+ priv, &ht16k33_bl_ops,
+ &bl_props);
+ if (IS_ERR(bl)) {
+ dev_err(dev, "failed to register backlight\n");
+ return PTR_ERR(bl);
+ }
- bl->props.brightness = brightness;
- ht16k33_bl_update_status(bl);
+ bl->props.brightness = brightness;
+ ht16k33_bl_update_status(bl);
+ }
/* Framebuffer (2 bytes per column) */
BUILD_BUG_ON(PAGE_SIZE < HT16K33_FB_SIZE);
@@ -575,7 +660,7 @@ static int ht16k33_seg_probe(struct device *dev, struct ht16k33_priv *priv,
struct ht16k33_seg *seg = &priv->seg;
int err;
- err = ht16k33_brightness_set(priv, MAX_BRIGHTNESS);
+ err = ht16k33_brightness_set(priv, brightness);
if (err)
return err;
@@ -653,6 +738,11 @@ static int ht16k33_probe(struct i2c_client *client)
dft_brightness = MAX_BRIGHTNESS;
}
+ /* LED */
+ err = ht16k33_led_probe(dev, &priv->led, dft_brightness);
+ if (err)
+ return err;
+
/* Keypad */
if (client->irq > 0) {
err = ht16k33_keypad_probe(client, &priv->keypad);