hwmon: (pmbus/ibm-cffps) Fix LED blink behavior

The LED blink_set function incorrectly did not tell the PSU LED to blink
if brightness was LED_OFF. Fix this, and also correct the LED_OFF
command data, which should give control of the LED back to the PSU
firmware. Also prevent I2C failures from getting the driver LED state
out of sync and add some dev_dbg statements.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20191106200106.29519-3-eajames@linux.ibm.com
Fixes: ef9e1cdf419a3 ("hwmon: (pmbus/cffps) Add led class device for power supply fault led")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c
index aa4cdbbb100a9c3b7f048b8ab0c389cb9f9a064f..929c909ac27ab3b18bf120472630e553bb9074de 100644 (file)
--- a/drivers/hwmon/pmbus/ibm-cffps.c
+++ b/drivers/hwmon/pmbus/ibm-cffps.c
@@ -39,9 +39,13 @@
 #define CFFPS_MFR_VAUX_FAULT                   BIT(6)
 #define CFFPS_MFR_CURRENT_SHARE_WARNING                BIT(7)
 
+/*
+ * LED off state actually relinquishes LED control to PSU firmware, so it can
+ * turn on the LED for faults.
+ */
+#define CFFPS_LED_OFF                          0
 #define CFFPS_LED_BLINK                                BIT(0)
 #define CFFPS_LED_ON                           BIT(1)
-#define CFFPS_LED_OFF                          BIT(2)
 #define CFFPS_BLINK_RATE_MS                    250
 
 enum {
@@ -296,23 +300,31 @@ static int ibm_cffps_led_brightness_set(struct led_classdev *led_cdev,
                                        enum led_brightness brightness)
 {
        int rc;
+       u8 next_led_state;
        struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 
        if (brightness == LED_OFF) {
-               psu->led_state = CFFPS_LED_OFF;
+               next_led_state = CFFPS_LED_OFF;
        } else {
                brightness = LED_FULL;
+
                if (psu->led_state != CFFPS_LED_BLINK)
-                       psu->led_state = CFFPS_LED_ON;
+                       next_led_state = CFFPS_LED_ON;
+               else
+                       next_led_state = CFFPS_LED_BLINK;
        }
 
+       dev_dbg(&psu->client->dev, "LED brightness set: %d. Command: %d.\n",
+               brightness, next_led_state);
+
        pmbus_set_page(psu->client, 0);
 
        rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD,
-                                      psu->led_state);
+                                      next_led_state);
        if (rc < 0)
                return rc;
 
+       psu->led_state = next_led_state;
        led_cdev->brightness = brightness;
 
        return 0;
@@ -325,10 +337,7 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
        int rc;
        struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led);
 
-       psu->led_state = CFFPS_LED_BLINK;
-
-       if (led_cdev->brightness == LED_OFF)
-               return 0;
+       dev_dbg(&psu->client->dev, "LED blink set.\n");
 
        pmbus_set_page(psu->client, 0);
 
@@ -337,6 +346,8 @@ static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev,
        if (rc < 0)
                return rc;
 
+       psu->led_state = CFFPS_LED_BLINK;
+       led_cdev->brightness = LED_FULL;
        *delay_on = CFFPS_BLINK_RATE_MS;
        *delay_off = CFFPS_BLINK_RATE_MS;