diff options
| -rw-r--r-- | drivers/hwmon/pmbus/ibm-cffps.c | 96 |
1 files changed, 88 insertions, 8 deletions
diff --git a/drivers/hwmon/pmbus/ibm-cffps.c b/drivers/hwmon/pmbus/ibm-cffps.c index 2d6f4f41e736..93d9a9ea112b 100644 --- a/drivers/hwmon/pmbus/ibm-cffps.c +++ b/drivers/hwmon/pmbus/ibm-cffps.c @@ -13,6 +13,7 @@ #include <linux/fs.h> #include <linux/i2c.h> #include <linux/jiffies.h> +#include <linux/leds.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/pmbus.h> @@ -25,6 +26,7 @@ #define CFFPS_CCIN_CMD 0xBD #define CFFPS_FW_CMD_START 0xFA #define CFFPS_FW_NUM_BYTES 4 +#define CFFPS_SYS_CONFIG_CMD 0xDA #define CFFPS_INPUT_HISTORY_CMD 0xD6 #define CFFPS_INPUT_HISTORY_SIZE 100 @@ -39,6 +41,11 @@ #define CFFPS_MFR_VAUX_FAULT BIT(6) #define CFFPS_MFR_CURRENT_SHARE_WARNING BIT(7) +#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 { CFFPS_DEBUGFS_INPUT_HISTORY = 0, CFFPS_DEBUGFS_FRU, @@ -63,6 +70,10 @@ struct ibm_cffps { struct ibm_cffps_input_history input_history; int debugfs_entries[CFFPS_DEBUGFS_NUM_ENTRIES]; + + char led_name[32]; + u8 led_state; + struct led_classdev led; }; #define to_psu(x, y) container_of((x), struct ibm_cffps, debugfs_entries[(y)]) @@ -258,6 +269,69 @@ static int ibm_cffps_read_word_data(struct i2c_client *client, int page, return rc; } +static void ibm_cffps_led_brightness_set(struct led_classdev *led_cdev, + enum led_brightness brightness) +{ + int rc; + struct ibm_cffps *psu = container_of(led_cdev, struct ibm_cffps, led); + + if (brightness == LED_OFF) { + psu->led_state = CFFPS_LED_OFF; + } else { + brightness = LED_FULL; + if (psu->led_state != CFFPS_LED_BLINK) + psu->led_state = CFFPS_LED_ON; + } + + rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD, + psu->led_state); + if (rc < 0) + return; + + led_cdev->brightness = brightness; +} + +static int ibm_cffps_led_blink_set(struct led_classdev *led_cdev, + unsigned long *delay_on, + unsigned long *delay_off) +{ + 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; + + rc = i2c_smbus_write_byte_data(psu->client, CFFPS_SYS_CONFIG_CMD, + CFFPS_LED_BLINK); + if (rc < 0) + return rc; + + *delay_on = CFFPS_BLINK_RATE_MS; + *delay_off = CFFPS_BLINK_RATE_MS; + + return 0; +} + +static void ibm_cffps_create_led_class(struct ibm_cffps *psu) +{ + int rc; + struct i2c_client *client = psu->client; + struct device *dev = &client->dev; + + snprintf(psu->led_name, sizeof(psu->led_name), "%s-%02x", client->name, + client->addr); + psu->led.name = psu->led_name; + psu->led.max_brightness = LED_FULL; + psu->led.brightness_set = ibm_cffps_led_brightness_set; + psu->led.blink_set = ibm_cffps_led_blink_set; + + rc = devm_led_classdev_register(dev, &psu->led); + if (rc) + dev_warn(dev, "failed to register led class: %d\n", rc); +} + static struct pmbus_driver_info ibm_cffps_info = { .pages = 1, .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | @@ -286,6 +360,20 @@ static int ibm_cffps_probe(struct i2c_client *client, if (rc) return rc; + /* + * Don't fail the probe if there isn't enough memory for leds and + * debugfs. + */ + psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); + if (!psu) + return 0; + + psu->client = client; + mutex_init(&psu->input_history.update_lock); + psu->input_history.last_update = jiffies - HZ; + + ibm_cffps_create_led_class(psu); + /* Don't fail the probe if we can't create debugfs */ debugfs = pmbus_get_debugfs_dir(client); if (!debugfs) @@ -295,14 +383,6 @@ static int ibm_cffps_probe(struct i2c_client *client, if (!ibm_cffps_dir) return 0; - psu = devm_kzalloc(&client->dev, sizeof(*psu), GFP_KERNEL); - if (!psu) - return 0; - - psu->client = client; - mutex_init(&psu->input_history.update_lock); - psu->input_history.last_update = jiffies - HZ; - for (i = 0; i < CFFPS_DEBUGFS_NUM_ENTRIES; ++i) psu->debugfs_entries[i] = i; |