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leds: lp55xx: support dynamic channel settings in the device tree structure

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Currently, the LP55xx DT structure supports max 3 channels.
However, LP5523 has max 9 channels and LP5562 has 4 channels.
To enhance this constraint, the DT structure has been changed.

 (a) Use the child node for various channel settings instead of fixed array
 (b) Remove 'num_channel' property.
     This value can be retrieved by counting the children node.
 (c) 'chan-name' property supported
 (d) Documentation updates for LP5521 and LP5523

(cooloney@gmail.com: fix a coding style issue in leds-lp55xx.txt)

Cc: Gabriel Fernandez <gabriel.fernandez@stericsson.com>
Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Kim, Milo
2013-05-07 00:14:48 -07:00
committed by Bryan Wu
parent a036e4cde5
commit 2dac912809
2 changed files with 128 additions and 44 deletions
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61
drivers/leds/leds-lp55xx-common.c
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@@ -557,51 +557,42 @@ EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
{
struct device_node *child;
struct lp55xx_platform_data *pdata;
u8 led_cur[3];
u8 max_cur[3];
u8 clock_mode;
u8 num_channel;
const char *label;
struct lp55xx_led_config *led_config;
int ret;
int i;
struct lp55xx_led_config *cfg;
int num_channels;
int i = 0;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
ret = of_property_read_u8(np, "num-channel", &num_channel);
if (ret < 0)
return ret;
ret = of_property_read_u8_array(np, "led-cur", led_cur, num_channel);
if (ret < 0)
return ret;
ret = of_property_read_u8_array(np, "max-cur", max_cur, num_channel);
if (ret < 0)
return ret;
ret = of_property_read_string(np, "label", &label);
if (ret < 0)
return ret;
ret = of_property_read_u8_array(np, "clock-mode", &clock_mode, 1);
if (ret < 0)
return ret;
num_channels = of_get_child_count(np);
if (num_channels == 0) {
dev_err(dev, "no LED channels\n");
return -EINVAL;
}
led_config = devm_kzalloc(dev, sizeof(*led_config) * num_channel,
GFP_KERNEL);
if (!led_config)
cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL);
if (!cfg)
return -ENOMEM;
for (i = 0; i < num_channel; i++) {
led_config[i].chan_nr = i;
led_config[i].led_current = led_cur[i];
led_config[i].max_current = max_cur[i];
pdata->led_config = &cfg[0];
pdata->num_channels = num_channels;
for_each_child_of_node(np, child) {
cfg[i].chan_nr = i;
of_property_read_string(child, "chan-name", &cfg[i].name);
of_property_read_u8(child, "led-cur", &cfg[i].led_current);
of_property_read_u8(child, "max-cur", &cfg[i].max_current);
i++;
}
pdata->label = kzalloc(sizeof(char) * 32, GFP_KERNEL);
strcpy((char *)pdata->label, (char *) label);
pdata->led_config = &led_config[0];
pdata->num_channels = num_channel;
pdata->clock_mode = clock_mode;
of_property_read_string(np, "label", &pdata->label);
of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
dev->platform_data = pdata;
return 0;