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leds: qpnp-flash-v2: Add sysfs support to query max_current

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Add support to query max_current for each switch node through
sysfs. This will be useful to know the maximum current that
the flash switch device can draw at that time.

Change-Id: Ie83e71eafff5c49c81f56f92aa719662814997ed
Signed-off-by: Devesh Jhunjhunwala <deveshj@codeaurora.org>
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>
This commit is contained in:
Subbaraman Narayanamurthy 2016-08-17 16:19:32 -07:00
parent 8e69887600
commit e03e61b954
1 changed files with 57 additions and 2 deletions
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59
drivers/leds/leds-qpnp-flash-v2.c
View file

@ -1050,6 +1050,32 @@ static void qpnp_flash_led_brightness_set(struct led_classdev *led_cdev,
spin_unlock(&led->lock);
}
/* sysfs show function for flash_max_current */
static ssize_t qpnp_flash_led_max_current_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int rc;
struct flash_switch_data *snode;
struct qpnp_flash_led *led;
struct led_classdev *led_cdev = dev_get_drvdata(dev);
snode = container_of(led_cdev, struct flash_switch_data, cdev);
led = dev_get_drvdata(&snode->pdev->dev);
rc = qpnp_flash_led_get_max_avail_current(led);
if (rc < 0)
dev_err(&led->pdev->dev, "query max current failed, rc=%d\n",
rc);
return snprintf(buf, PAGE_SIZE, "%d\n", rc);
}
/* sysfs attributes exported by flash_led */
static struct device_attribute qpnp_flash_led_attrs[] = {
__ATTR(max_current, (S_IRUGO | S_IWUSR | S_IWGRP),
qpnp_flash_led_max_current_show, NULL),
};
static int flash_led_psy_notifier_call(struct notifier_block *nb,
unsigned long ev, void *v)
{
@ -1785,7 +1811,7 @@ static int qpnp_flash_led_probe(struct platform_device *pdev)
struct device_node *node, *temp;
const char *temp_string;
unsigned int base;
int rc, i = 0;
int rc, i = 0, j = 0;
node = pdev->dev.of_node;
if (!node) {
@ -1946,12 +1972,36 @@ static int qpnp_flash_led_probe(struct platform_device *pdev)
goto unreg_notifier;
}
for (i = 0; i < led->num_snodes; i++) {
for (j = 0; j < ARRAY_SIZE(qpnp_flash_led_attrs); j++) {
rc = sysfs_create_file(&led->snode[i].cdev.dev->kobj,
&qpnp_flash_led_attrs[j].attr);
if (rc < 0) {
dev_err(&pdev->dev, "sysfs creation failed, rc=%d\n",
rc);
goto sysfs_fail;
}
}
}
spin_lock_init(&led->lock);
dev_set_drvdata(&pdev->dev, led);
return 0;
sysfs_fail:
for (--j; j >= 0; j--)
sysfs_remove_file(&led->snode[i].cdev.dev->kobj,
&qpnp_flash_led_attrs[j].attr);
for (--i; i >= 0; i--) {
for (j = 0; j < ARRAY_SIZE(qpnp_flash_led_attrs); j++)
sysfs_remove_file(&led->snode[i].cdev.dev->kobj,
&qpnp_flash_led_attrs[j].attr);
}
i = led->num_snodes;
unreg_notifier:
power_supply_unreg_notifier(&led->nb);
error_switch_register:
@ -1968,9 +2018,13 @@ error_led_register:
static int qpnp_flash_led_remove(struct platform_device *pdev)
{
struct qpnp_flash_led *led = dev_get_drvdata(&pdev->dev);
int i;
int i, j;
for (i = 0; i < led->num_snodes; i++) {
for (j = 0; j < ARRAY_SIZE(qpnp_flash_led_attrs); j++)
sysfs_remove_file(&led->snode[i].cdev.dev->kobj,
&qpnp_flash_led_attrs[j].attr);
if (led->snode[i].num_regulators) {
if (led->snode[i].regulator_on)
qpnp_flash_led_regulator_enable(led,
@ -1982,6 +2036,7 @@ static int qpnp_flash_led_remove(struct platform_device *pdev)
while (i > 0)
led_classdev_unregister(&led->snode[--i].cdev);
i = led->num_fnodes;
while (i > 0)
led_classdev_unregister(&led->fnode[--i].cdev);