On Fri, 2015-03-20 at 16:34 +0530, Vasant Hegde wrote:
> From: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
>
> This patch implements LED driver for PowerNV platform using the existing
> generic LED class framework. It registers classdev structures for all
> individual LEDs detected on the system through LED specific device tree
> nodes. Device tree nodes specify what all kind of LEDs present on the
> same location code. It registers LED classdev structure for each of them.
>
> The platform level implementation of LED get and set state has been
> achieved through OPAL calls. These calls are made available for the
> driver by exporting from architecture specific codes.
>
> As per the LED class framework, the 'brightness_set' function should not
> sleep. Hence these functions have been implemented through global work
> queue tasks which might sleep on OPAL async call completion.
>
> All the system LEDs can be found in the same regular path /sys/class/leds/.
> There are two different kind of LEDs present for the same location code,
> one being the identify indicator and other one being the fault indicator.
> We don't use LED colors. Hence our LEDs have names in this format.
>
> <location_code>:<ATTENTION|IDENTIFY|FAULT>
>
> Any positive brightness value would turn on the LED and a zero value
> would turn off the LED. The driver will return LED_FULL (255) for any
> turned on LED and LED_OFF for any turned off LED.
Any comment from the LEDs folks ? I am not too familiar with the LED
subsystem so I would appreciate at least a cursory review of the high
level design :-)
> Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Vasant Hegde <hegdevasant@xxxxxxxxxxxxxxxxxx>
> Acked-by: Stewart Smith <stewart@xxxxxxxxxxxxxxxxxx>
> Tested-by: Stewart Smith <stewart@xxxxxxxxxxxxxxxxxx>
> ---
> Changes in v2:
> - Added System Attention indicator support
> - Moved common code to powernv_led_set_queue()
>
> -Vasant
>
>
> arch/powerpc/platforms/powernv/opal.c | 12 +
> drivers/leds/Kconfig | 9
> drivers/leds/Makefile | 1
> drivers/leds/leds-powernv.c | 620 +++++++++++++++++++++++++++++++++
> 4 files changed, 641 insertions(+), 1 deletion(-)
> create mode 100644 drivers/leds/leds-powernv.c
>
> diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
> index 142a08a..fbfd9c1 100644
> --- a/arch/powerpc/platforms/powernv/opal.c
> +++ b/arch/powerpc/platforms/powernv/opal.c
> @@ -746,7 +746,7 @@ static void __init opal_irq_init(struct device_node *dn)
>
> static int __init opal_init(void)
> {
> - struct device_node *np, *consoles;
> + struct device_node *np, *consoles, *led;
> int rc;
>
> opal_node = of_find_node_by_path("/ibm,opal");
> @@ -772,6 +772,13 @@ static int __init opal_init(void)
> /* Create i2c platform devices */
> opal_i2c_create_devs();
>
> + /* Create led platform devices */
> + led = of_find_node_by_path("/ibm,opal/led");
> + if (led) {
> + of_platform_device_create(led, "opal_led", NULL);
> + of_node_put(led);
> + }
> +
> /* Find all OPAL interrupts and request them */
> opal_irq_init(opal_node);
>
> @@ -904,3 +911,6 @@ EXPORT_SYMBOL_GPL(opal_rtc_write);
> EXPORT_SYMBOL_GPL(opal_tpo_read);
> EXPORT_SYMBOL_GPL(opal_tpo_write);
> EXPORT_SYMBOL_GPL(opal_i2c_request);
> +/* Export these symbols for PowerNV LED class driver */
> +EXPORT_SYMBOL_GPL(opal_leds_get_ind);
> +EXPORT_SYMBOL_GPL(opal_leds_set_ind);
> diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
> index 25b320d..a93223c 100644
> --- a/drivers/leds/Kconfig
> +++ b/drivers/leds/Kconfig
> @@ -508,6 +508,15 @@ config LEDS_BLINKM
> This option enables support for the BlinkM RGB LED connected
> through I2C. Say Y to enable support for the BlinkM LED.
>
> +config LEDS_POWERNV
> + tristate "LED support for PowerNV Platform"
> + depends on LEDS_CLASS
> + depends on PPC_POWERNV
> + help
> + This option enables support for the system LEDs present on
> + PowerNV platforms. Say 'y' to enable this support in kernel.
> + Say 'm' enable this support as module.
> +
> config LEDS_SYSCON
> bool "LED support for LEDs on system controllers"
> depends on LEDS_CLASS=y
> diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
> index cbba921..604ffc9 100644
> --- a/drivers/leds/Makefile
> +++ b/drivers/leds/Makefile
> @@ -58,6 +58,7 @@ obj-$(CONFIG_LEDS_BLINKM) += leds-blinkm.o
> obj-$(CONFIG_LEDS_SYSCON) += leds-syscon.o
> obj-$(CONFIG_LEDS_VERSATILE) += leds-versatile.o
> obj-$(CONFIG_LEDS_MENF21BMC) += leds-menf21bmc.o
> +obj-$(CONFIG_LEDS_POWERNV) += leds-powernv.o
>
> # LED SPI Drivers
> obj-$(CONFIG_LEDS_DAC124S085) += leds-dac124s085.o
> diff --git a/drivers/leds/leds-powernv.c b/drivers/leds/leds-powernv.c
> new file mode 100644
> index 0000000..0c9f958
> --- /dev/null
> +++ b/drivers/leds/leds-powernv.c
> @@ -0,0 +1,620 @@
> +/*
> + * PowerNV LED Driver
> + *
> + * Copyright IBM Corp. 2015
> + *
> + * Author: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
> + * Author: Vasant Hegde <hegdevasant@xxxxxxxxxxxxxxxxxx>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + */
> +
> +#define PREFIX "POWERNV_LED"
> +#define pr_fmt(fmt) PREFIX ": " fmt
> +
> +#include <linux/platform_device.h>
> +#include <linux/leds.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/slab.h>
> +#include <linux/list.h>
> +
> +#include <asm/opal.h>
> +
> +#define LED_STR_ATTENTION ":ATTENTION"
> +#define LED_STR_IDENT ":IDENTIFY"
> +#define LED_STR_FAULT ":FAULT"
> +
> +/*
> + * LED operation state
> + *
> + * led_classdev_unregister resets the brightness values. However
> + * we want to retain the LED state across boot. Hence disable
> + * LED operation before calling led_classdev_unregister.
> + */
> +static bool led_disabled = false;
> +
> +/*
> + * LED type map
> + *
> + * Converts LED event type into it's description.
> + */
> +static const char *led_type_map[OPAL_SLOT_LED_TYPE_MAX] = {
> + "Attention", "Identify", "Fault"
> +};
> +
> +/*
> + * LED set routines have been implemented as work queue tasks scheduled
> + * on the global work queue. Individual task calls OPAL interface to set
> + * the LED state which might sleep for some time. A lot of work queue
> + * tasks attempting to set the LED states can prevent each other from
> + * completing their task. So there is a need to restrict the total number
> + * of work queue tasks at any point in time related to LED.
> + */
> +#define MAX_LED_REQ_COUNT 100
> +static int led_req_count;
> +
> +/*
> + * LED classdev
> + *
> + * Each LED classdev structure registered on the platform will be put into
> + * a list which will be eventually used for de-registration purpose.
> + */
> +struct powernv_led {
> + struct led_classdev cdev;
> + struct list_head link;
> +};
> +static LIST_HEAD(powernv_led_list);
> +static DEFINE_SPINLOCK(powernv_led_spinlock);
> +
> +/*
> + * LED set state command
> + *
> + * Each set LED state request will be saved and put into a list to be
> + * processed later by a work queue task.
> + */
> +struct powernv_led_cmd {
> + struct led_classdev *led_cdev; /* Points to classdev structure */
> + enum led_brightness value; /* Brightness value */
> + u64 led_type; /* Identify or Fault */
> + struct list_head link;
> +};
> +static LIST_HEAD(powernv_led_cmd_list);
> +static DEFINE_SPINLOCK(powernv_led_cmd_spinlock);
> +
> +/*
> + * LED set state task
> + *
> + * Each set LED state request added into the request list for post
> + * processing will be followed by one of this structure. The work
> + * struct here will be scheduled on the global work queue to process
> + * one of the requests from the request list. Though the order of
> + * execution is not guaraneteed.
> + */
> +struct powernv_led_work {
> + struct work_struct work; /* Individual task */
> + bool deletion; /* Need deletion */
> + struct list_head link;
> +};
> +static LIST_HEAD(powernv_led_work_list);
> +static DEFINE_SPINLOCK(powernv_led_work_spinlock);
> +
> +/*
> + * powernv_led_compact_work_list
> + *
> + * This function goes through the entire list of scheduled powernv_led_work
> + * nodes and removes the nodes which have already processed one set LED
> + * state request from request list and has been marked for deletion. This is
> + * essential for cleaning the list before adding new elements into it. This
> + * also tracks the total number of pending tasks. Once it reaches the
> + * threshold the function will throttle till all the scheduled tasks completes
> + * execution during which the user space thread will block and will be
> + * prevented from queuing up more LED state change requests.
> + */
> +static void powernv_led_compact_work_list(void)
> +{
> + struct powernv_led_work *pwork, *pwork_ne;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&powernv_led_work_spinlock, flags);
> + led_req_count = 0;
> + list_for_each_entry_safe(pwork, pwork_ne,
> + &powernv_led_work_list, link) {
> + if (pwork->deletion) {
> + list_del(&pwork->link);
> + kfree(pwork);
> + continue;
> + }
> + led_req_count++;
> + }
> + spin_unlock_irqrestore(&powernv_led_work_spinlock, flags);
> +
> + /* Throttle if the threshold reached */
> + if (led_req_count == MAX_LED_REQ_COUNT) {
> + list_for_each_entry(pwork, &powernv_led_work_list, link)
> + flush_work(&pwork->work);
> + }
> +}
> +
> +/*
> + * powernv_led_set
> + *
> + * This commits the state change of the requested LED through an OPAL call.
> + * This function is called from work queue task context when ever it gets
> + * scheduled. This function can sleep at opal_async_wait_response call.
> + */
> +static void powernv_led_set(struct led_classdev *led_cdev,
> + enum led_brightness value, u64 led_type)
> +{
> + char *loc_code;
> + int rc, token;
> + u64 led_mask, max_led_type, led_value = 0;
> + struct opal_msg msg;
> +
> + /* Location code of the LED */
> + loc_code = kasprintf(GFP_KERNEL, "%s", led_cdev->name);
> + if (!loc_code) {
> + pr_err(PREFIX "Memory allocation failed at %s\n", __func__);
> + return;
> + }
> +
> + switch (led_type) {
> + case OPAL_SLOT_LED_TYPE_ATTN:
> + loc_code[strlen(loc_code) - strlen(LED_STR_ATTENTION)] = '\0';
> + break;
> + case OPAL_SLOT_LED_TYPE_ID:
> + loc_code[strlen(loc_code) - strlen(LED_STR_IDENT)] = '\0';
> + break;
> + case OPAL_SLOT_LED_TYPE_FAULT:
> + loc_code[strlen(loc_code) - strlen(LED_STR_FAULT)] = '\0';
> + break;
> + default: /* Unknown LED type */
> + goto out_loc;
> + }
> +
> + /* Prepare for the OPAL call */
> + max_led_type = cpu_to_be64(OPAL_SLOT_LED_TYPE_MAX);
> + led_mask = OPAL_SLOT_LED_STATE_ON << led_type;
> + if (value)
> + led_value = OPAL_SLOT_LED_STATE_ON << led_type;
> +
> + /* OPAL async call */
> + token = opal_async_get_token_interruptible();
> + if (token < 0) {
> + if (token != -ERESTARTSYS)
> + pr_err("%s: Couldn't get the token, returning\n",
> + __func__);
> + goto out_loc;
> + }
> +
> + rc = opal_leds_set_ind(token, loc_code,
> + led_mask, led_value, &max_led_type);
> + if (rc != OPAL_ASYNC_COMPLETION) {
> + pr_err("OPAL call opal_leds_set_ind failed for %s with %d\n",
> + loc_code, rc);
> + goto out_token;
> + }
> +
> + rc = opal_async_wait_response(token, &msg);
> + if (rc) {
> + pr_err("%s: Failed to wait for the async response, %d\n",
> + __func__, rc);
> + goto out_token;
> + }
> +
> + rc = be64_to_cpu(msg.params[1]);
> + if (rc != OPAL_SUCCESS)
> + pr_err("Async call returned with failed status: %d\n", rc);
> +
> +out_token:
> + opal_async_release_token(token);
> +
> +out_loc:
> + kfree(loc_code);
> +}
> +
> +/*
> + * powernv_led_get
> + *
> + * This function fetches the LED state for a given LED type for
> + * mentioned LED classdev structure.
> + */
> +static enum led_brightness powernv_led_get(struct led_classdev *led_cdev,
> + u64 led_type)
> +{
> + char *loc_code;
> + int rc;
> + u64 led_mask, led_value, max_led_type;
> +
> + /* LED location code */
> + loc_code = kasprintf(GFP_KERNEL, "%s", led_cdev->name);
> + if (!loc_code) {
> + pr_err("Memory allocation failed at: %s\n", __func__);
> + return -ENOMEM;
> + }
> +
> + switch (led_type) {
> + case OPAL_SLOT_LED_TYPE_ATTN:
> + loc_code[strlen(loc_code) - strlen(LED_STR_ATTENTION)] = '\0';
> + break;
> + case OPAL_SLOT_LED_TYPE_ID:
> + loc_code[strlen(loc_code) - strlen(LED_STR_IDENT)] = '\0';
> + break;
> + case OPAL_SLOT_LED_TYPE_FAULT:
> + loc_code[strlen(loc_code) - strlen(LED_STR_FAULT)] = '\0';
> + break;
> + default: /* Unsupported LED type */
> + goto led_fail;
> + }
> +
> + /* Fetch all LED status */
> + led_mask = cpu_to_be64(0);
> + led_value = cpu_to_be64(0);
> + max_led_type = cpu_to_be64(OPAL_SLOT_LED_TYPE_MAX);
> +
> + rc = opal_leds_get_ind(loc_code, &led_mask, &led_value, &max_led_type);
> + if (rc != OPAL_SUCCESS && rc != OPAL_PARTIAL) {
> + pr_err("OPAL call opal_leds_get_ind failed with %d\n", rc);
> + goto led_fail;
> + }
> +
> + led_mask = be64_to_cpu(led_mask);
> + led_value = be64_to_cpu(led_value);
> +
> + /* LED status available */
> + if (!((led_mask >> led_type) & OPAL_SLOT_LED_STATE_ON)) {
> + pr_err("%s LED status not available for %s\n",
> + led_type_map[led_type], loc_code);
> + goto led_fail;
> + }
> +
> + /* LED status value */
> + if ((led_value >> led_type) & OPAL_SLOT_LED_STATE_ON) {
> + kfree(loc_code);
> + return LED_FULL;
> + }
> +
> +led_fail:
> + kfree(loc_code);
> + return LED_OFF;
> +}
> +
> +/*
> + * powernv_led_work_func
> + *
> + * This the function which will be executed by any LED work task on the
> + * global work queue. This function de-queues one of the request node
> + * from the request list, processes it and then deletes the request node.
> + * This also accesses it's own work list node and sets the deletion flag
> + * in there making itself a candidate for removal the next time the
> + * compact function gets called.
> + */
> +static void powernv_led_work_func(struct work_struct *work)
> +{
> + struct powernv_led_work *pwork;
> + struct powernv_led_cmd *req;
> + unsigned long flags;
> +
> + /* De-queue one request, process it and then delete */
> + spin_lock_irqsave(&powernv_led_cmd_spinlock, flags);
> + if (list_empty(&powernv_led_cmd_list)) {
> + pr_err("Request list empty, but work queue task queued\n");
> + spin_unlock_irqrestore(&powernv_led_cmd_spinlock, flags);
> + return;
> + }
> +
> + req = list_first_entry(&powernv_led_cmd_list,
> + struct powernv_led_cmd, link);
> + list_del(&req->link);
> + spin_unlock_irqrestore(&powernv_led_cmd_spinlock, flags);
> +
> + powernv_led_set(req->led_cdev, req->value, req->led_type);
> + kfree(req);
> +
> + /* Mark the work queue task for deletion */
> + spin_lock_irqsave(&powernv_led_work_spinlock, flags);
> + pwork = container_of(work, struct powernv_led_work, work);
> + pwork->deletion = true;
> + spin_unlock_irqrestore(&powernv_led_work_spinlock, flags);
> +}
> +
> +/*
> + * powernv_led_set_queue
> + *
> + * LED classdev 'brightness_set' function for LEDs
> + */
> +static void powernv_led_set_queue(struct led_classdev *led_cdev,
> + enum led_brightness value, u64 led_type)
> +{
> + struct powernv_led_work *pwork;
> + struct powernv_led_cmd *attn;
> + unsigned long flags;
> +
> + if (led_disabled)
> + return;
> +
> + /* Allocate the request */
> + attn = kzalloc(sizeof(struct powernv_led_cmd), GFP_KERNEL);
> + if (!attn) {
> + pr_err("Memory allocation failed at: %s\n", __func__);
> + return;
> + }
> +
> + /* Allocate the work */
> + pwork = kzalloc(sizeof(struct powernv_led_work), GFP_KERNEL);
> + if (!pwork) {
> + pr_err("Memory allocation failed at: %s\n", __func__);
> + kfree(attn);
> + return;
> + }
> +
> + /* Prepare the request */
> + attn->led_cdev = led_cdev;
> + attn->value = value;
> + attn->led_type = led_type;
> +
> + /* Queue the request */
> + spin_lock_irqsave(&powernv_led_cmd_spinlock, flags);
> + list_add_tail(&attn->link, &powernv_led_cmd_list);
> + spin_unlock_irqrestore(&powernv_led_cmd_spinlock, flags);
> +
> + /* Compact the work list */
> + powernv_led_compact_work_list();
> +
> + /* Add the new task into the work list */
> + spin_lock_irqsave(&powernv_led_work_spinlock, flags);
> + list_add_tail(&pwork->link, &powernv_led_work_list);
> + spin_unlock_irqrestore(&powernv_led_work_spinlock, flags);
> +
> + /* Schedule the new task */
> + INIT_WORK(&pwork->work, powernv_led_work_func);
> + schedule_work(&pwork->work);
> +}
> +/*
> + * powernv_led_set_attn
> + *
> + * LED classdev 'brightness_set' function for attention LED.
> + */
> +static void powernv_led_set_attn(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + return powernv_led_set_queue(led_cdev, value,
> + OPAL_SLOT_LED_TYPE_ATTN);
> +}
> +
> +/*
> + * powernv_led_get_attn
> + *
> + * LED classdev 'brightness_get' function for attention LED.
> + */
> +static enum led_brightness powernv_led_get_attn(struct led_classdev *led_cdev)
> +{
> + return powernv_led_get(led_cdev, OPAL_SLOT_LED_TYPE_ATTN);
> +}
> +
> +/*
> + * powernv_led_set_ident
> + *
> + * LED classdev 'brightness_set' function for identify LED types.
> + */
> +static void powernv_led_set_ident(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + return powernv_led_set_queue(led_cdev, value, OPAL_SLOT_LED_TYPE_ID);
> +}
> +
> +/*
> + * powernv_led_get_ident
> + *
> + * LED classdev 'brightness_get' function for identify LED types.
> + */
> +static enum led_brightness powernv_led_get_ident(struct led_classdev *led_cdev)
> +{
> + return powernv_led_get(led_cdev, OPAL_SLOT_LED_TYPE_ID);
> +}
> +
> +/*
> + * powernv_led_set_fault
> + *
> + * LED classdev 'brightness_set' function for fault LED types.
> + */
> +static void powernv_led_set_fault(struct led_classdev *led_cdev,
> + enum led_brightness value)
> +{
> + return powernv_led_set_queue(led_cdev, value,
> + OPAL_SLOT_LED_TYPE_FAULT);
> +}
> +
> +/*
> + * powernv_led_get_fault
> + *
> + * LED classdev 'brightness_get' function for fault LED types.
> + */
> +static enum led_brightness powernv_led_get_fault(struct led_classdev *led_cdev)
> +{
> + return powernv_led_get(led_cdev, OPAL_SLOT_LED_TYPE_FAULT);
> +}
> +
> +/*
> + * has_led_type
> + *
> + * This function verifies whether the child LED device node supports certain
> + * type of LED or not. This will be used to register LEDclassdev structures
> + * for that particual type of LED for a given device tree node.
> + */
> +static bool has_led_type(struct device_node *cled, const char *led_type)
> +{
> + bool result = false;
> +
> + if (of_property_match_string(cled, "led-types", led_type) >= 0)
> + result = true;
> +
> + return result;
> +}
> +
> +/*
> + * power_led_classdev
> + *
> + * This function registers classdev structure for any given type of LED on
> + * a given child LED device node.
> + */
> +static int power_led_classdev(struct platform_device *pdev,
> + struct device_node *cled, u64 led_type)
> +{
> + int rc;
> + unsigned long flags;
> + struct powernv_led *cpled;
> +
> + cpled = kzalloc(sizeof(struct powernv_led), GFP_KERNEL);
> + if (!cpled) {
> + pr_err("Memory allocation failed at %s\n", __func__);
> + return -ENOMEM;
> + }
> +
> + /* Create the name for classdev */
> + switch (led_type) {
> + case OPAL_SLOT_LED_TYPE_ATTN:
> + cpled->cdev.name = kasprintf(GFP_KERNEL, "%s%s",
> + cled->name, LED_STR_ATTENTION);
> + cpled->cdev.brightness_set = powernv_led_set_attn;
> + cpled->cdev.brightness_get = powernv_led_get_attn;
> + break;
> + case OPAL_SLOT_LED_TYPE_ID:
> + cpled->cdev.name = kasprintf(GFP_KERNEL, "%s%s",
> + cled->name, LED_STR_IDENT);
> + cpled->cdev.brightness_set = powernv_led_set_ident;
> + cpled->cdev.brightness_get = powernv_led_get_ident;
> + break;
> + case OPAL_SLOT_LED_TYPE_FAULT:
> + cpled->cdev.name = kasprintf(GFP_KERNEL, "%s%s",
> + cled->name, LED_STR_FAULT);
> + cpled->cdev.brightness_set = powernv_led_set_fault;
> + cpled->cdev.brightness_get = powernv_led_get_fault;
> + break;
> + default: /* Unsupported LED type */
> + return -EINVAL;
> + }
> +
> + if (!cpled->cdev.name) {
> + pr_err("Memory allocation failed for classdev name\n");
> + return -ENOMEM;
> + }
> +
> + cpled->cdev.brightness = LED_OFF;
> + cpled->cdev.max_brightness = LED_FULL;
> + cpled->cdev.flags = LED_CORE_SUSPENDRESUME;
> +
> + /* Register the classdev */
> + rc = led_classdev_register(&pdev->dev, &cpled->cdev);
> + if (rc) {
> + pr_err("Classdev registration failed for %s\n",
> + cpled->cdev.name);
> + } else {
> + spin_lock_irqsave(&powernv_led_spinlock, flags);
> + list_add_tail(&cpled->link, &powernv_led_list);
> + spin_unlock_irqrestore(&powernv_led_spinlock, flags);
> + pr_debug("Classdev registration successful for %s\n",
> + cpled->cdev.name);
> + }
> + return rc;
> +}
> +
> +/* Platform driver probe */
> +static int powernv_led_probe(struct platform_device *pdev)
> +{
> + struct device_node *led, *cled;
> + int rc = 0;
> +
> + led = of_find_node_by_path("/ibm,opal/led");
> + if (!led) {
> + pr_err("LED parent device node not found\n");
> + return -EINVAL;
> + }
> +
> + for_each_child_of_node(led, cled) {
> + if (has_led_type(cled, LED_TYPE_ATTENTION))
> + rc = power_led_classdev(pdev, cled,
> + OPAL_SLOT_LED_TYPE_ATTN);
> +
> + if (has_led_type(cled, LED_TYPE_IDENTIFY))
> + rc = power_led_classdev(pdev, cled,
> + OPAL_SLOT_LED_TYPE_ID);
> +
> + if (has_led_type(cled, LED_TYPE_FAULT))
> + rc = power_led_classdev(pdev, cled,
> + OPAL_SLOT_LED_TYPE_FAULT);
> + }
> + return rc;
> +}
> +
> +/* Platform driver remove */
> +static int powernv_led_remove(struct platform_device *pdev)
> +{
> + struct powernv_led *pled;
> + struct powernv_led_work *pwork;
> + unsigned long flags;
> +
> + /* Disable LED operation */
> + led_disabled = true;
> +
> + pr_info("Unregister all classdev structures\n");
> + list_for_each_entry(pled, &powernv_led_list, link)
> + led_classdev_unregister(&pled->cdev);
> +
> + pr_info("Wait for all work tasks to finish\n");
> + list_for_each_entry(pwork, &powernv_led_work_list, link)
> + flush_work(&pwork->work);
> +
> + /* Free nodes from the work list */
> + powernv_led_compact_work_list();
> +
> + /* Free nodes from the classdev list */
> + spin_lock_irqsave(&powernv_led_spinlock, flags);
> + while (!list_empty(&powernv_led_list)) {
> + pled = list_first_entry(&powernv_led_list,
> + struct powernv_led, link);
> + list_del(&pled->link);
> + kfree(pled);
> + }
> + spin_unlock_irqrestore(&powernv_led_spinlock, flags);
> +
> + /* Check for memory leaks */
> + if (!list_empty(&powernv_led_work_list))
> + pr_warn("Work list not empty, memory leak\n");
> +
> + if (!list_empty(&powernv_led_cmd_list))
> + pr_warn("Request list not empty, memory leak\n");
> +
> + if (!list_empty(&powernv_led_list))
> + pr_warn("Classdev list not empty, memory leak\n");
> +
> + return 0;
> +}
> +
> +/* Platform driver property match */
> +static const struct of_device_id powernv_led_match[] = {
> + {
> + .compatible = "ibm,opal-v3-led",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, powernv_led_match);
> +
> +static struct platform_driver powernv_led_driver = {
> + .probe = powernv_led_probe,
> + .remove = powernv_led_remove,
> + .driver = {
> + .name = "powernv-led-driver",
> + .owner = THIS_MODULE,
> + .of_match_table = powernv_led_match,
> + },
> +};
> +
> +module_platform_driver(powernv_led_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION("PowerNV LED driver");
> +MODULE_AUTHOR("Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>");
>
> _______________________________________________
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