Oleh
On 9/9/19 2:16 AM, Oleh Kravchenko wrote:
This patch adds a LED class driver for the LEDs found on
the Crane Merchandising System EL15203000 LEDs board
(aka RED LEDs board).
Signed-off-by: Oleh Kravchenko <oleg@xxxxxxxxxx>
---
.../testing/sysfs-class-led-driver-el15203000 | 32 ++
drivers/leds/Kconfig | 13 +
drivers/leds/Makefile | 1 +
drivers/leds/leds-el15203000.c | 356 ++++++++++++++++++
4 files changed, 402 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-class-led-driver-el15203000
create mode 100644 drivers/leds/leds-el15203000.c
[...]
+
+static int el15203000_pattern_set_P(struct led_classdev *ldev,
+ struct led_pattern *pattern,
+ u32 len, int repeat)
+{
+ struct el15203000_led *led = container_of(ldev,
+ struct el15203000_led,
+ ldev);
+
+ if (repeat > 0)
+ return -EINVAL;
+
+ if (is_cascade(pattern, len, false, false)) {
+ dev_dbg(led->priv->dev, "Cascade mode for 0x%02x(%c)",
+ led->reg, led->reg);
+
+ return el15203000_cmd(led, EL_PIPE_CASCADE);
+ } else if (is_cascade(pattern, len, true, false)) {
+ dev_dbg(led->priv->dev, "Inverse cascade mode for 0x%02x(%c)",
+ led->reg, led->reg);
+
+ return el15203000_cmd(led, EL_PIPE_INV_CASCADE);
+ } else if (is_bounce(pattern, len, false)) {
+ dev_dbg(led->priv->dev, "Bounce mode for 0x%02x(%c)",
+ led->reg, led->reg);
+
+ return el15203000_cmd(led, EL_PIPE_BOUNCE);
+ } else if (is_bounce(pattern, len, true)) {
+ dev_dbg(led->priv->dev, "Inverse bounce mode for 0x%02x(%c)",
+ led->reg, led->reg);
+
+ return el15203000_cmd(led, EL_PIPE_INV_BOUNCE);
+ }
+
nitpicking a bit not a blocker just some clean up
maybe remove the dev_dbg statements and just set a local variable to the
pipe cmd
if (is_cascade(pattern, len, false, false))
pipe_cmd = EL_PIPE_CASCADE;
else if (is_cascade(pattern, len, true, false))
pipe_cmd = EL_PIPE_INV_CASCADE;
else
return -EINVAL;
return el15203000_cmd(led, pipe_cmd0:
+ return -EINVAL;
+}
+
+static int el15203000_pattern_clear(struct led_classdev *ldev)
+{
+ struct el15203000_led *led = container_of(ldev,
+ struct el15203000_led,
+ ldev);
+
+ return el15203000_cmd(led, EL_OFF);
+}
+
+static int el15203000_probe_dt(struct el15203000 *priv)
+{
+ struct el15203000_led *led = priv->leds;
+ struct fwnode_handle *child;
+ int ret;
+
+ device_for_each_child_node(priv->dev, child) {
+ struct led_init_data init_data = {};
+
+ ret = fwnode_property_read_u32(child, "reg", &led->reg);
+ if (ret) {
+ dev_err(priv->dev, "LED without ID number");
+ fwnode_handle_put(child);
+
+ return ret;
+ }
+
+ if (led->reg > U8_MAX) {
+ dev_err(priv->dev, "LED value %d is invalid", led->reg);
+ fwnode_handle_put(child);
+
+ return -EINVAL;
+ }
+
+ fwnode_property_read_string(child, "linux,default-trigger",
+ &led->ldev.default_trigger);
+
+ led->priv = priv;
+ led->ldev.max_brightness = LED_ON;
+ led->ldev.brightness_set_blocking = el15203000_set_blocking;
+
+ if (led->reg == 'S') {
+ led->ldev.pattern_set = el15203000_pattern_set_S;
+ led->ldev.pattern_clear = el15203000_pattern_clear;
+ } else if (led->reg == 'P') {
+ led->ldev.pattern_set = el15203000_pattern_set_P;
+ led->ldev.pattern_clear = el15203000_pattern_clear;
+ }
+
+ init_data.fwnode = child;
+ ret = devm_led_classdev_register_ext(priv->dev, &led->ldev,
+ &init_data);
+ if (ret) {
+ dev_err(priv->dev,
+ "failed to register LED device %s, err %d",
+ led->ldev.name, ret);
+ fwnode_handle_put(child);
+
+ return ret;
+ }
+
+ led++;
+ }
+
+ return ret;
+}
+
+static int el15203000_probe(struct spi_device *spi)
+{
+ struct el15203000 *priv;
+ size_t count;
+ int ret;
+
+ count = device_get_child_node_count(&spi->dev);
+ if (!count) {
+ dev_err(&spi->dev, "LEDs are not defined in device tree!");
+ return -ENODEV;
+ }
+
+ priv = devm_kzalloc(&spi->dev, struct_size(priv, leds, count),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ mutex_init(&priv->lock);
+ priv->count = count;
+ priv->dev = &spi->dev;
+ priv->spi = spi;
+ priv->delay = jiffies -
+ usecs_to_jiffies(EL_FW_DELAY_USEC);
+
+ ret = el15203000_probe_dt(priv);
+ if (ret)
+ return ret;
+
+ spi_set_drvdata(spi, priv);
+
+ return 0;
Another nitpick again just some clean up.
Set spi_set_drvdata before you call the probe_dt then return on
el15203000_probe_dt this will allow you to eliminate the local ret variable.
so it would look like this:
spi_set_drvdata(spi, priv);
return el15203000_probe_dt(priv);
Otherwise
Reviewed-by: Dan Murphy <dmurphy@xxxxxx>
<snip>
