Commit 2976b179 authored by Simon Guinot's avatar Simon Guinot Committed by Jacek Anaszewski

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: default avatarSimon Guinot <simon.guinot@sequanux.org>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarJacek Anaszewski <j.anaszewski@samsung.com>
parent 1c7b9d0e
Binding for the GPIO extension bus found on some LaCie/Seagate boards
(Example: 2Big/5Big Network v2, 2Big NAS).
Required properties:
- compatible: "lacie,netxbig-gpio-ext".
- addr-gpios: GPIOs representing the address register (LSB -> MSB).
- data-gpios: GPIOs representing the data register (LSB -> MSB).
- enable-gpio: latches the new configuration (address, data) on raising edge.
Example:
netxbig_gpio_ext: netxbig-gpio-ext {
compatible = "lacie,netxbig-gpio-ext";
addr-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH
&gpio1 16 GPIO_ACTIVE_HIGH
&gpio1 17 GPIO_ACTIVE_HIGH>;
data-gpios = <&gpio1 12 GPIO_ACTIVE_HIGH
&gpio1 13 GPIO_ACTIVE_HIGH
&gpio1 14 GPIO_ACTIVE_HIGH>;
enable-gpio = <&gpio0 29 GPIO_ACTIVE_HIGH>;
};
Binding for the CPLD LEDs (GPIO extension bus) found on some LaCie/Seagate
boards (Example: 2Big/5Big Network v2, 2Big NAS).
Required properties:
- compatible: "lacie,netxbig-leds".
- gpio-ext: Phandle for the gpio-ext bus.
Optional properties:
- timers: Timer array. Each timer entry is represented by three integers:
Mode (gpio-ext bus), delay_on and delay_off.
Each LED is represented as a sub-node of the netxbig-leds device.
Required sub-node properties:
- mode-addr: Mode register address on gpio-ext bus.
- mode-val: Mode to value mapping. Each entry is represented by two integers:
A mode and the corresponding value on the gpio-ext bus.
- bright-addr: Brightness register address on gpio-ext bus.
- max-brightness: Maximum brightness value.
Optional sub-node properties:
- label: Name for this LED. If omitted, the label is taken from the node name.
- linux,default-trigger: Trigger assigned to the LED.
Example:
netxbig-leds {
compatible = "lacie,netxbig-leds";
gpio-ext = &gpio_ext;
timers = <NETXBIG_LED_TIMER1 500 500
NETXBIG_LED_TIMER2 500 1000>;
blue-power {
label = "netxbig:blue:power";
mode-addr = <0>;
mode-val = <NETXBIG_LED_OFF 0
NETXBIG_LED_ON 1
NETXBIG_LED_TIMER1 3
NETXBIG_LED_TIMER2 7>;
bright-addr = <1>;
max-brightness = <7>;
};
red-power {
label = "netxbig:red:power";
mode-addr = <0>;
mode-val = <NETXBIG_LED_OFF 0
NETXBIG_LED_ON 2
NETXBIG_LED_TIMER1 4>;
bright-addr = <1>;
max-brightness = <7>;
};
blue-sata0 {
label = "netxbig:blue:sata0";
mode-addr = <3>;
mode-val = <NETXBIG_LED_OFF 0
NETXBIG_LED_ON 7
NETXBIG_LED_SATA 1
NETXBIG_LED_TIMER1 3>;
bright-addr = <2>;
max-brightness = <7>;
};
red-sata0 {
label = "netxbig:red:sata0";
mode-addr = <3>;
mode-val = <NETXBIG_LED_OFF 0
NETXBIG_LED_ON 2
NETXBIG_LED_TIMER1 4>;
bright-addr = <2>;
max-brightness = <7>;
};
blue-sata1 {
label = "netxbig:blue:sata1";
mode-addr = <4>;
mode-val = <NETXBIG_LED_OFF 0
NETXBIG_LED_ON 7
NETXBIG_LED_SATA 1
NETXBIG_LED_TIMER1 3>;
bright-addr = <2>;
max-brightness = <7>;
};
red-sata1 {
label = "netxbig:red:sata1";
mode-addr = <4>;
mode-val = <NETXBIG_LED_OFF 0
NETXBIG_LED_ON 2
NETXBIG_LED_TIMER1 4>;
bright-addr = <2>;
max-brightness = <7>;
};
};
......@@ -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) {
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -EINVAL;
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 @@ static int netxbig_led_probe(struct platform_device *pdev)
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);
......@@ -404,6 +639,7 @@ static struct platform_driver netxbig_led_driver = {
.remove = netxbig_led_remove,
.driver = {
.name = "leds-netxbig",
.of_match_table = of_match_ptr(of_netxbig_leds_match),
},
};
......
/*
* This header provides constants for netxbig LED bindings.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef _DT_BINDINGS_LEDS_NETXBIG_H
#define _DT_BINDINGS_LEDS_NETXBIG_H
#define NETXBIG_LED_OFF 0
#define NETXBIG_LED_ON 1
#define NETXBIG_LED_SATA 2
#define NETXBIG_LED_TIMER1 3
#define NETXBIG_LED_TIMER2 4
#endif /* _DT_BINDINGS_LEDS_NETXBIG_H */
......@@ -40,6 +40,7 @@ struct netxbig_led {
int mode_addr;
int *mode_val;
int bright_addr;
int bright_max;
};
struct netxbig_led_platform_data {
......
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