summaryrefslogtreecommitdiff
path: root/drivers/leds
diff options
context:
space:
mode:
authorSimon Guinot <simon.guinot@sequanux.org>2015-09-26 23:02:34 +0200
committerJacek Anaszewski <j.anaszewski@samsung.com>2015-11-03 08:59:25 +0100
commit2976b17989094e97567510be3ea91fc2f0c7aab3 (patch)
tree14a992a731356d21977550dea8cbd0cd999726e4 /drivers/leds
parent1c7b9d0edf5ada916fd02e66355f79f2089ee095 (diff)
leds: netxbig: add device tree binding
This patch adds device tree support for the netxbig LEDs. This also introduces a additionnal DT binding for the GPIO extension bus (netxbig-gpio-ext) used to configure the LEDs. Since this bus could also be used to control other devices, then it seems more suitable to have it in a separate DT binding. Signed-off-by: Simon Guinot <simon.guinot@sequanux.org> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-netxbig.c280
1 files changed, 258 insertions, 22 deletions
diff --git a/drivers/leds/leds-netxbig.c b/drivers/leds/leds-netxbig.c
index 25e419752a7b..e1f3c2632278 100644
--- a/drivers/leds/leds-netxbig.c
+++ b/drivers/leds/leds-netxbig.c
@@ -26,6 +26,7 @@
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
+#include <linux/of_gpio.h>
#include <linux/leds.h>
#include <linux/platform_data/leds-kirkwood-netxbig.h>
@@ -140,6 +141,11 @@ struct netxbig_led_data {
spinlock_t lock;
};
+struct netxbig_led_priv {
+ struct netxbig_led_platform_data *pdata;
+ struct netxbig_led_data leds_data[];
+};
+
static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
unsigned long delay_on,
unsigned long delay_off,
@@ -304,12 +310,12 @@ static void delete_netxbig_led(struct netxbig_led_data *led_dat)
led_classdev_unregister(&led_dat->cdev);
}
-static int
-create_netxbig_led(struct platform_device *pdev,
- struct netxbig_led_data *led_dat,
- const struct netxbig_led *template)
+static int create_netxbig_led(struct platform_device *pdev, int led,
+ struct netxbig_led_priv *priv)
{
- struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+ struct netxbig_led_platform_data *pdata = priv->pdata;
+ struct netxbig_led_data *led_dat = &priv->leds_data[led];
+ const struct netxbig_led *template = &priv->pdata->leds[led];
spin_lock_init(&led_dat->lock);
led_dat->gpio_ext = pdata->gpio_ext;
@@ -333,7 +339,7 @@ create_netxbig_led(struct platform_device *pdev,
led_dat->mode_addr = template->mode_addr;
led_dat->mode_val = template->mode_val;
led_dat->bright_addr = template->bright_addr;
- led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
+ led_dat->bright_max = template->bright_max;
led_dat->timer = pdata->timer;
led_dat->num_timer = pdata->num_timer;
/*
@@ -346,38 +352,269 @@ create_netxbig_led(struct platform_device *pdev,
return led_classdev_register(&pdev->dev, &led_dat->cdev);
}
+#ifdef CONFIG_OF_GPIO
+static int gpio_ext_get_of_pdata(struct device *dev, struct device_node *np,
+ struct netxbig_gpio_ext *gpio_ext)
+{
+ int *addr, *data;
+ int num_addr, num_data;
+ int ret;
+ int i;
+
+ ret = of_gpio_named_count(np, "addr-gpios");
+ if (ret < 0) {
+ dev_err(dev,
+ "Failed to count GPIOs in DT property addr-gpios\n");
+ return ret;
+ }
+ num_addr = ret;
+ addr = devm_kzalloc(dev, num_addr * sizeof(*addr), GFP_KERNEL);
+ if (!addr)
+ return -ENOMEM;
+
+ for (i = 0; i < num_addr; i++) {
+ ret = of_get_named_gpio(np, "addr-gpios", i);
+ if (ret < 0)
+ return ret;
+ addr[i] = ret;
+ }
+ gpio_ext->addr = addr;
+ gpio_ext->num_addr = num_addr;
+
+ ret = of_gpio_named_count(np, "data-gpios");
+ if (ret < 0) {
+ dev_err(dev,
+ "Failed to count GPIOs in DT property data-gpios\n");
+ return ret;
+ }
+ num_data = ret;
+ data = devm_kzalloc(dev, num_data * sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ for (i = 0; i < num_data; i++) {
+ ret = of_get_named_gpio(np, "data-gpios", i);
+ if (ret < 0)
+ return ret;
+ data[i] = ret;
+ }
+ gpio_ext->data = data;
+ gpio_ext->num_data = num_data;
+
+ ret = of_get_named_gpio(np, "enable-gpio", 0);
+ if (ret < 0) {
+ dev_err(dev,
+ "Failed to get GPIO from DT property enable-gpio\n");
+ return ret;
+ }
+ gpio_ext->enable = ret;
+
+ return 0;
+}
+
+static int netxbig_leds_get_of_pdata(struct device *dev,
+ struct netxbig_led_platform_data *pdata)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *gpio_ext_np;
+ struct device_node *child;
+ struct netxbig_gpio_ext *gpio_ext;
+ struct netxbig_led_timer *timers;
+ struct netxbig_led *leds, *led;
+ int num_timers;
+ int num_leds = 0;
+ int ret;
+ int i;
+
+ /* GPIO extension */
+ gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
+ if (!gpio_ext_np) {
+ dev_err(dev, "Failed to get DT handle gpio-ext\n");
+ return -EINVAL;
+ }
+
+ gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
+ if (!gpio_ext)
+ return -ENOMEM;
+ ret = gpio_ext_get_of_pdata(dev, gpio_ext_np, gpio_ext);
+ if (ret)
+ return ret;
+ of_node_put(gpio_ext_np);
+ pdata->gpio_ext = gpio_ext;
+
+ /* Timers (optional) */
+ ret = of_property_count_u32_elems(np, "timers");
+ if (ret > 0) {
+ if (ret % 3)
+ return -EINVAL;
+ num_timers = ret / 3;
+ timers = devm_kzalloc(dev, num_timers * sizeof(*timers),
+ GFP_KERNEL);
+ if (!timers)
+ return -ENOMEM;
+ for (i = 0; i < num_timers; i++) {
+ u32 tmp;
+
+ of_property_read_u32_index(np, "timers", 3 * i,
+ &timers[i].mode);
+ if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
+ return -EINVAL;
+ of_property_read_u32_index(np, "timers",
+ 3 * i + 1, &tmp);
+ timers[i].delay_on = tmp;
+ of_property_read_u32_index(np, "timers",
+ 3 * i + 2, &tmp);
+ timers[i].delay_off = tmp;
+ }
+ pdata->timer = timers;
+ pdata->num_timer = num_timers;
+ }
+
+ /* LEDs */
+ num_leds = of_get_child_count(np);
+ if (!num_leds) {
+ dev_err(dev, "No LED subnodes found in DT\n");
+ return -ENODEV;
+ }
+
+ leds = devm_kzalloc(dev, num_leds * sizeof(*leds), GFP_KERNEL);
+ if (!leds)
+ return -ENOMEM;
+
+ led = leds;
+ for_each_child_of_node(np, child) {
+ const char *string;
+ int *mode_val;
+ int num_modes;
+
+ ret = of_property_read_u32(child, "mode-addr",
+ &led->mode_addr);
+ if (ret)
+ goto err_node_put;
+
+ ret = of_property_read_u32(child, "bright-addr",
+ &led->bright_addr);
+ if (ret)
+ goto err_node_put;
+
+ ret = of_property_read_u32(child, "max-brightness",
+ &led->bright_max);
+ if (ret)
+ goto err_node_put;
+
+ mode_val =
+ devm_kzalloc(dev,
+ NETXBIG_LED_MODE_NUM * sizeof(*mode_val),
+ GFP_KERNEL);
+ if (!mode_val) {
+ ret = -ENOMEM;
+ goto err_node_put;
+ }
+
+ for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
+ mode_val[i] = NETXBIG_LED_INVALID_MODE;
+
+ ret = of_property_count_u32_elems(child, "mode-val");
+ if (ret < 0 || ret % 2) {
+ ret = -EINVAL;
+ goto err_node_put;
+ }
+ num_modes = ret / 2;
+ if (num_modes > NETXBIG_LED_MODE_NUM) {
+ ret = -EINVAL;
+ goto err_node_put;
+ }
+
+ for (i = 0; i < num_modes; i++) {
+ int mode;
+ int val;
+
+ of_property_read_u32_index(child,
+ "mode-val", 2 * i, &mode);
+ of_property_read_u32_index(child,
+ "mode-val", 2 * i + 1, &val);
+ if (mode >= NETXBIG_LED_MODE_NUM) {
+ ret = -EINVAL;
+ goto err_node_put;
+ }
+ mode_val[mode] = val;
+ }
+ led->mode_val = mode_val;
+
+ if (!of_property_read_string(child, "label", &string))
+ led->name = string;
+ else
+ led->name = child->name;
+
+ if (!of_property_read_string(child,
+ "linux,default-trigger", &string))
+ led->default_trigger = string;
+
+ led++;
+ }
+
+ pdata->leds = leds;
+ pdata->num_leds = num_leds;
+
+ return 0;
+
+err_node_put:
+ of_node_put(child);
+ return ret;
+}
+
+static const struct of_device_id of_netxbig_leds_match[] = {
+ { .compatible = "lacie,netxbig-leds", },
+ {},
+};
+#else
+static inline int
+netxbig_leds_get_of_pdata(struct device *dev,
+ struct netxbig_led_platform_data *pdata)
+{
+ return -ENODEV;
+}
+#endif /* CONFIG_OF_GPIO */
+
static int netxbig_led_probe(struct platform_device *pdev)
{
struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct netxbig_led_data *leds_data;
+ struct netxbig_led_priv *priv;
int i;
int ret;
- if (!pdata)
- return -EINVAL;
+ if (!pdata) {
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+ ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
+ if (ret)
+ return ret;
+ }
- leds_data = devm_kzalloc(&pdev->dev,
- sizeof(struct netxbig_led_data) * pdata->num_leds, GFP_KERNEL);
- if (!leds_data)
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv) +
+ pdata->num_leds * sizeof(struct netxbig_led_data),
+ GFP_KERNEL);
+ if (!priv)
return -ENOMEM;
+ priv->pdata = pdata;
ret = gpio_ext_init(pdata->gpio_ext);
if (ret < 0)
return ret;
for (i = 0; i < pdata->num_leds; i++) {
- ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
+ ret = create_netxbig_led(pdev, i, priv);
if (ret < 0)
goto err_free_leds;
}
-
- platform_set_drvdata(pdev, leds_data);
+ platform_set_drvdata(pdev, priv);
return 0;
err_free_leds:
for (i = i - 1; i >= 0; i--)
- delete_netxbig_led(&leds_data[i]);
+ delete_netxbig_led(&priv->leds_data[i]);
gpio_ext_free(pdata->gpio_ext);
return ret;
@@ -385,14 +622,12 @@ err_free_leds:
static int netxbig_led_remove(struct platform_device *pdev)
{
- struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct netxbig_led_data *leds_data;
+ struct netxbig_led_priv *priv = platform_get_drvdata(pdev);
+ struct netxbig_led_platform_data *pdata = priv->pdata;
int i;
- leds_data = platform_get_drvdata(pdev);
-
for (i = 0; i < pdata->num_leds; i++)
- delete_netxbig_led(&leds_data[i]);
+ delete_netxbig_led(&priv->leds_data[i]);
gpio_ext_free(pdata->gpio_ext);
@@ -403,7 +638,8 @@ static struct platform_driver netxbig_led_driver = {
.probe = netxbig_led_probe,
.remove = netxbig_led_remove,
.driver = {
- .name = "leds-netxbig",
+ .name = "leds-netxbig",
+ .of_match_table = of_match_ptr(of_netxbig_leds_match),
},
};