[PATCH leds v2 45/50] leds: ns2: register LED immediately after parsing DT properties

Marek Behún
2020-09-17T22:34:41Z

Register each LED immediately after parsing OF properties. This
simplifies the driver.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Simon Guinot <simon.guinot@sequanux.org>
Cc: Simon Guinot <sguinot@lacie.com>
Cc: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
---
drivers/leds/leds-ns2.c | 143 +++++++++++-----------------------------
1 file changed, 40 insertions(+), 103 deletions(-)

diff --git a/drivers/leds/leds-ns2.c b/drivers/leds/leds-ns2.c
index 801b7f851be7a..9d9c9ff4dce61 100644
--- a/drivers/leds/leds-ns2.c
+++ b/drivers/leds/leds-ns2.c
@@ -30,20 +30,6 @@ struct ns2_led_modval {
int slow_level;
};

-struct ns2_led_of_one {
- const char *name;
- const char *default_trigger;
- struct gpio_desc *cmd;
- struct gpio_desc *slow;
- int num_modes;
- struct ns2_led_modval *modval;
-};
-
-struct ns2_led_of {
- int num_leds;
- struct ns2_led_of_one *leds;
-};
-
/*
* The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
* modes are available: off, on and SATA activity blinking. The LED modes are
@@ -184,63 +170,29 @@ static struct attribute *ns2_led_attrs[] = {
};
ATTRIBUTE_GROUPS(ns2_led);

-static int
-create_ns2_led(struct device *dev, struct ns2_led *led,
- const struct ns2_led_of_one *template)
-{
- int ret;
- enum ns2_led_modes mode;
-
- rwlock_init(&led->rw_lock);
-
- led->cdev.name = template->name;
- led->cdev.default_trigger = template->default_trigger;
- led->cdev.blink_set = NULL;
- led->cdev.flags |= LED_CORE_SUSPENDRESUME;
- led->cdev.groups = ns2_led_groups;
- led->cmd = template->cmd;
- led->slow = template->slow;
- led->can_sleep = gpiod_cansleep(led->cmd) | gpiod_cansleep(led->slow);
- if (led->can_sleep)
- led->cdev.brightness_set_blocking = ns2_led_set_blocking;
- else
- led->cdev.brightness_set = ns2_led_set;
- led->modval = template->modval;
- led->num_modes = template->num_modes;
-
- ret = ns2_led_get_mode(led, &mode);
- if (ret < 0)
- return ret;
-
- /* Set LED initial state. */
- led->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
- led->cdev.brightness = (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
-
- return devm_led_classdev_register(dev, &led->cdev);
-}
-
-static int ns2_leds_parse_one(struct device *dev, struct device_node *np,
- struct ns2_led_of_one *led)
+static int ns2_led_register(struct device *dev, struct device_node *np,
+ struct ns2_led *led)
{
struct ns2_led_modval *modval;
+ enum ns2_led_modes mode;
int nmodes, ret, i;

- ret = of_property_read_string(np, "label", &led->name);
+ ret = of_property_read_string(np, "label", &led->cdev.name);
if (ret)
- led->name = np->name;
+ led->cdev.name = np->name;

led->cmd = devm_gpiod_get_from_of_node(dev, np, "cmd-gpio", 0,
- GPIOD_ASIS, led->name);
+ GPIOD_ASIS, np->name);
if (IS_ERR(led->cmd))
return PTR_ERR(led->cmd);

led->slow = devm_gpiod_get_from_of_node(dev, np, "slow-gpio", 0,
- GPIOD_ASIS, led->name);
+ GPIOD_ASIS, np->name);
if (IS_ERR(led->slow))
return PTR_ERR(led->slow);

of_property_read_string(np, "linux,default-trigger",
- &led->default_trigger);
+ &led->cdev.default_trigger);

ret = of_property_count_u32_elems(np, "modes-map");
if (ret < 0 || ret % 3) {
@@ -264,45 +216,32 @@ static int ns2_leds_parse_one(struct device *dev, struct device_node *np,
modval[i].slow_level = val;
}

+ rwlock_init(&led->rw_lock);
+
+ led->cdev.blink_set = NULL;
+ led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+ led->cdev.groups = ns2_led_groups;
+ led->can_sleep = gpiod_cansleep(led->cmd) || gpiod_cansleep(led->slow);
+ if (led->can_sleep)
+ led->cdev.brightness_set_blocking = ns2_led_set_blocking;
+ else
+ led->cdev.brightness_set = ns2_led_set;
led->num_modes = nmodes;
led->modval = modval;

- return 0;
-}
-
-/*
- * Translate OpenFirmware node properties into platform_data.
- */
-static int
-ns2_leds_parse_of(struct device *dev, struct ns2_led_of *ofdata)
-{
- struct device_node *np = dev_of_node(dev);
- struct device_node *child;
- struct ns2_led_of_one *led, *leds;
- int ret, num_leds = 0;
-
- num_leds = of_get_available_child_count(np);
- if (!num_leds)
- return -ENODEV;
-
- leds = devm_kcalloc(dev, num_leds, sizeof(struct ns2_led),
- GFP_KERNEL);
- if (!leds)
- return -ENOMEM;
+ ret = ns2_led_get_mode(led, &mode);
+ if (ret < 0)
+ return ret;

- led = leds;
- for_each_available_child_of_node(np, child) {
- ret = ns2_leds_parse_one(dev, child, led++);
- if (ret < 0) {
- of_node_put(child);
- return ret;
- }
- }
+ /* Set LED initial state. */
+ led->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
+ led->cdev.brightness = (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;

- ofdata->leds = leds;
- ofdata->num_leds = num_leds;
+ ret = devm_led_classdev_register(dev, &led->cdev);
+ if (ret)
+ dev_err(dev, "Failed to register LED for node %pOF\n", np);

- return 0;
+ return ret;
}

static const struct of_device_id of_ns2_leds_match[] = {
@@ -314,28 +253,26 @@ MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
static int ns2_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct ns2_led_of *ofdata;
+ struct device_node *np, *child;
struct ns2_led *leds;
- int i;
+ int count;
int ret;

- ofdata = devm_kzalloc(dev, sizeof(struct ns2_led_of), GFP_KERNEL);
- if (!ofdata)
- return -ENOMEM;
-
- ret = ns2_leds_parse_of(dev, ofdata);
- if (ret)
- return ret;
+ np = dev_of_node(dev);
+ count = of_get_available_child_count(np);
+ if (!count)
+ return -ENODEV;

- leds = devm_kzalloc(dev, array_size(sizeof(*leds), ofdata->num_leds),
- GFP_KERNEL);
+ leds = devm_kzalloc(dev, array_size(sizeof(*leds), count), GFP_KERNEL);
if (!leds)
return -ENOMEM;

- for (i = 0; i < ofdata->num_leds; i++) {
- ret = create_ns2_led(dev, &leds[i], &ofdata->leds[i]);
- if (ret < 0)
+ for_each_available_child_of_node(np, child) {
+ ret = ns2_led_register(dev, child, leds++);
+ if (ret) {
+ of_node_put(child);
return ret;
+ }
}

return 0;
--
2.26.2