[PATCH v2 12/17] leds: leds-nuc: implement blink control for NUC6

[Mauro Carvalho Chehab <mchehab+huawei@kernel.org>]

The blink control logic for NUC6 API is somewhat messy, as it
uses a single register for controlling both the blink type
and the frequency, using a random order.

Let's use the same API as defined for other versions,
splitting this setting on two different properties.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 drivers/leds/leds-nuc.c | 269 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 267 insertions(+), 2 deletions(-)

diff --git a/drivers/leds/leds-nuc.c b/drivers/leds/leds-nuc.c
index e2517e1a367f..6aa0bf16c8b7 100644
--- a/drivers/leds/leds-nuc.c
+++ b/drivers/leds/leds-nuc.c
@@ -716,6 +716,247 @@ static ssize_t nuc6_store_color(struct device *dev,
 	return len;
 }
 
+enum nuc6_blink_mode_freq {
+	NUC6_BLINK_MODE_BLINK_1HZ	= 0x01,
+	NUC6_BLINK_MODE_BLINK_0_25HZ	= 0x02,
+	NUC6_BLINK_MODE_FADE_1HZ	= 0x03,
+	NUC6_BLINK_MODE_DONT_BLINK	= 0x04,
+
+	/* BIOS equal or upper AY0038 or BN0043 */
+	NUC6_BLINK_MODE_BLINK_0_5HZ	= 0x05,
+	NUC6_BLINK_MODE_FADE_0_25HZ	= 0x06,
+	NUC6_BLINK_MODE_FADE_0_5HZ	= 0x07
+};
+
+enum nuc6_blink_mode {
+	NUC6_BLINK_MODE_SOLID,
+	NUC6_BLINK_MODE_BLINK,
+	NUC6_BLINK_MODE_FADE
+};
+
+static const char * const nuc6_blink_behavior[] = {
+	"solid",
+	"blink",
+	"fade",
+};
+
+enum nuc6_blink_freq {
+	NUC6_BLINK_FREQ_1HZ,
+	NUC6_BLINK_FREQ_0_5HZ,
+	NUC6_BLINK_FREQ_0_25HZ,
+};
+
+static const char * const nuc6_blink_frequency[] = {
+	"1",
+	"0.5",
+	"0.25",
+};
+
+static int nuc_wmi_nuc6_set_blink(struct device *dev,
+				  struct nuc_nmi_led *led,
+				  int freq, enum nuc6_blink_mode mode)
+{
+	int val;
+
+	switch(mode) {
+	case NUC6_BLINK_MODE_SOLID:
+		val = NUC6_BLINK_MODE_DONT_BLINK;
+		break;
+	case NUC6_BLINK_MODE_BLINK:
+		if (freq == NUC6_BLINK_FREQ_0_25HZ)
+			val = NUC6_BLINK_MODE_BLINK_0_25HZ;
+		else if (freq == NUC6_BLINK_FREQ_0_5HZ)
+			val = NUC6_BLINK_MODE_BLINK_0_5HZ;
+		else
+			val = NUC6_BLINK_MODE_BLINK_1HZ;
+		break;
+	case NUC6_BLINK_MODE_FADE:
+		if (freq == NUC6_BLINK_FREQ_0_25HZ)
+			val = NUC6_BLINK_MODE_FADE_0_25HZ;
+		else if (freq == NUC6_BLINK_FREQ_0_5HZ)
+			val = NUC6_BLINK_MODE_FADE_0_5HZ;
+		else
+			val = NUC6_BLINK_MODE_FADE_1HZ;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return nuc_wmi_nuc6_led_get_set(dev, led, NULL, &val, NULL);
+}
+
+static ssize_t nuc6_show_blink_behavior(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+	int val = -1, mode = -1, ret, i, n;
+	int size = PAGE_SIZE;
+	char *p = buf;
+
+	ret = nuc_wmi_nuc6_led_get_set(dev, led, NULL, &val, NULL);
+	if (ret)
+		return ret;
+
+	switch (val) {
+	case NUC6_BLINK_MODE_BLINK_1HZ:
+	case NUC6_BLINK_MODE_BLINK_0_25HZ:
+	case NUC6_BLINK_MODE_BLINK_0_5HZ:
+		mode = NUC6_BLINK_MODE_BLINK;
+		break;
+	case NUC6_BLINK_MODE_FADE_1HZ:
+	case NUC6_BLINK_MODE_FADE_0_25HZ:
+	case NUC6_BLINK_MODE_FADE_0_5HZ:
+		mode = NUC6_BLINK_MODE_FADE;
+		break;
+	case NUC6_BLINK_MODE_DONT_BLINK:
+		mode = NUC6_BLINK_MODE_SOLID;
+		break;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(nuc6_blink_behavior); i++) {
+		if (i == mode)
+			n = scnprintf(p, size, "[%s]  ", nuc6_blink_behavior[i]);
+		else
+			n = scnprintf(p, size, "%s  ", nuc6_blink_behavior[i]);
+		p += n;
+		size -= n;
+	}
+	size -= scnprintf(p, size, "\n");
+
+	return PAGE_SIZE - size;
+
+}
+
+static ssize_t nuc6_store_blink_behavior(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+	int ret, val = -1, freq;
+	const char *tmp;
+
+	tmp = strsep((char **)&buf, "\n");
+
+	ret = nuc_wmi_nuc6_led_get_set(dev, led, NULL, &val, NULL);
+	if (ret)
+		return ret;
+
+	/* Preserve the frequency */
+	switch (val) {
+	case NUC6_BLINK_MODE_BLINK_0_25HZ:
+	case NUC6_BLINK_MODE_FADE_0_25HZ:
+		freq = NUC6_BLINK_FREQ_0_25HZ;
+		break;
+	case NUC6_BLINK_MODE_BLINK_0_5HZ:
+	case NUC6_BLINK_MODE_FADE_0_5HZ:
+		freq = NUC6_BLINK_FREQ_0_5HZ;
+		break;
+	default:
+		freq = NUC6_BLINK_FREQ_1HZ;
+		break;
+	}
+
+	for (val = ARRAY_SIZE(nuc6_blink_behavior)+1; val >= 0; val--)
+		if (!strcasecmp(tmp, nuc6_blink_behavior[val]))
+			    break;
+	if (val < 0)
+		return -EINVAL;
+
+	ret = nuc_wmi_nuc6_set_blink(dev, led, val, freq);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static ssize_t nuc6_show_blink_frequency(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+	int val = -1, freq = -1, ret, i, n;
+	int size = PAGE_SIZE;
+	char *p = buf;
+
+	ret = nuc_wmi_nuc6_led_get_set(dev, led, NULL, &val, NULL);
+	if (ret)
+		return ret;
+
+	switch (val) {
+	case NUC6_BLINK_MODE_BLINK_0_25HZ:
+	case NUC6_BLINK_MODE_FADE_0_25HZ:
+		freq = NUC6_BLINK_FREQ_0_25HZ;
+		break;
+	case NUC6_BLINK_MODE_BLINK_0_5HZ:
+	case NUC6_BLINK_MODE_FADE_0_5HZ:
+		freq = NUC6_BLINK_FREQ_0_5HZ;
+		break;
+	default:
+		freq = NUC6_BLINK_FREQ_1HZ;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(nuc6_blink_frequency); i++) {
+		if (i == freq)
+			n = scnprintf(p, size, "[%s]  ", nuc6_blink_frequency[i]);
+		else
+			n = scnprintf(p, size, "%s  ", nuc6_blink_frequency[i]);
+		p += n;
+		size -= n;
+	}
+	size -= scnprintf(p, size, "\n");
+
+	return PAGE_SIZE - size;
+}
+
+static ssize_t nuc6_store_blink_frequency(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+	enum nuc6_blink_mode mode;
+	int ret, freq, val = -1;
+	const char *tmp;
+
+	tmp = strsep((char **)&buf, "\n");
+
+	ret = nuc_wmi_nuc6_led_get_set(dev, led, NULL, &val, NULL);
+	if (ret)
+		return ret;
+
+	/* Preserve the blink mode */
+	switch (val) {
+	case NUC6_BLINK_MODE_BLINK_1HZ:
+	case NUC6_BLINK_MODE_BLINK_0_25HZ:
+	case NUC6_BLINK_MODE_BLINK_0_5HZ:
+		mode = NUC6_BLINK_MODE_BLINK;
+		break;
+	case NUC6_BLINK_MODE_FADE_1HZ:
+	case NUC6_BLINK_MODE_FADE_0_25HZ:
+	case NUC6_BLINK_MODE_FADE_0_5HZ:
+		mode = NUC6_BLINK_MODE_FADE;
+		break;
+	default: /* setting frequency NUC6_BLINK_MODE_SOLID won't make sense */
+		return -EINVAL;
+	}
+
+	for (freq = ARRAY_SIZE(nuc6_blink_frequency)+1; freq >= 0; freq--)
+		if (!strcasecmp(tmp, nuc6_blink_frequency[freq]))
+			    break;
+	if (freq < 0)
+		return -EINVAL;
+
+	ret = nuc_wmi_nuc6_set_blink(dev, led, mode, freq);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
 /* Show/change the LED indicator */
 
 static const char * const led_indicators[] = {
@@ -1217,6 +1458,12 @@ static ssize_t show_blink_behavior(struct device *dev,
 				   struct device_attribute *attr,
 				   char *buf)
 {
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+
+	if (led->api_rev == LED_API_NUC6)
+		return nuc6_show_blink_behavior(dev, attr, buf);
+
 	return offset_show_blink_behavior(dev, attr, 0, buf);
 }
 
@@ -1224,6 +1471,12 @@ static ssize_t store_blink_behavior(struct device *dev,
 				    struct device_attribute *attr,
 				    const char *buf, size_t len)
 {
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+
+	if (led->api_rev == LED_API_NUC6)
+		return nuc6_store_blink_behavior(dev, attr, buf, len);
+
 	return offset_store_blink_behavior(dev, attr, 0, buf, len);
 }
 
@@ -1322,6 +1575,12 @@ static ssize_t show_blink_frequency(struct device *dev,
 				   struct device_attribute *attr,
 				   char *buf)
 {
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+
+	if (led->api_rev == LED_API_NUC6)
+		return nuc6_show_blink_frequency(dev, attr, buf);
+
 	return offset_show_blink_frequency(dev, attr, 0, buf);
 }
 
@@ -1329,6 +1588,12 @@ static ssize_t store_blink_frequency(struct device *dev,
 				    struct device_attribute *attr,
 				    const char *buf, size_t len)
 {
+	struct led_classdev *cdev = dev_get_drvdata(dev);
+	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
+
+	if (led->api_rev == LED_API_NUC6)
+		return nuc6_store_blink_frequency(dev, attr, buf, len);
+
 	return offset_store_blink_frequency(dev, attr, 0, buf, len);
 }
 
@@ -1340,9 +1605,8 @@ static umode_t nuc_wmi_led_blink_is_visible(struct kobject *kobj,
 	struct nuc_nmi_led *led = container_of(cdev, struct nuc_nmi_led, cdev);
 	umode_t mode = attr->mode;
 
-	// TODO: implement for NUC6 API
 	if (led->api_rev == LED_API_NUC6)
-		return 0;
+		return mode;
 
 	if (led->id == LED_IND_SOFTWARE)
 		return mode;
@@ -1446,6 +1710,7 @@ static const struct attribute_group *nuc_wmi_led_attribute_groups[] = {
 
 static const struct attribute_group *nuc_wmi_nuc6_led_attribute_groups[] = {
 	&nuc_wmi_led_color_attribute_group,
+	&nuc_wmi_led_blink_attribute_group,
 	NULL
 };
 
-- 
2.31.1