linux-stable/drivers/leds/leds-88pm860x.c
Marek Behún 99a013c840 leds: various: use only available OF children
Various drivers count and iterate over OF children nodes via
of_get_child_count and for_each_child_of_node. Instead they should use
of_get_available_child_count and for_each_available_child_of_node, so
that if a given node has the `status` property set to `disabled`, the
child will be ignored.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Andrey Utkin <andrey_utkin@fastmail.com>
Cc: Baolin Wang <baolin.wang7@gmail.com>
Cc: Baolin Wang <baolin.wang@linaro.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christian Mauderer <oss@c-mauderer.de>
Cc: Chunyan Zhang <zhang.lyra@gmail.com>
Cc: Dan Murphy <dmurphy@ti.com>
Cc: David Rivshin <drivshin@allworx.com>
Cc: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: H. Nikolaus Schaller <hns@goldelico.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Milo Kim <milo.kim@ti.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Nikita Travkin <nikitos.tr@gmail.com>
Cc: Orson Zhai <orsonzhai@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Philippe Retornaz <philippe.retornaz@epfl.ch>
Cc: Riku Voipio <riku.voipio@iki.fi>
Cc: Simon Guinot <sguinot@lacie.com>
Cc: Simon Shields <simon@lineageos.org>
Cc: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Cc: Xiaotong Lu <xiaotong.lu@spreadtrum.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
2020-09-26 21:56:39 +02:00

240 lines
5.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* LED driver for Marvell 88PM860x
*
* Copyright (C) 2009 Marvell International Ltd.
* Haojian Zhuang <haojian.zhuang@marvell.com>
*/
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/mfd/88pm860x.h>
#include <linux/module.h>
#define LED_PWM_MASK (0x1F)
#define LED_CURRENT_MASK (0x07 << 5)
#define LED_BLINK_MASK (0x7F)
#define LED_ON_CONTINUOUS (0x0F << 3)
#define LED1_BLINK_EN (1 << 1)
#define LED2_BLINK_EN (1 << 2)
struct pm860x_led {
struct led_classdev cdev;
struct i2c_client *i2c;
struct pm860x_chip *chip;
struct mutex lock;
char name[MFD_NAME_SIZE];
int port;
int iset;
unsigned char brightness;
unsigned char current_brightness;
int reg_control;
int reg_blink;
int blink_mask;
};
static int led_power_set(struct pm860x_chip *chip, int port, int on)
{
int ret = -EINVAL;
switch (port) {
case 0:
case 1:
case 2:
ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
pm8606_osc_disable(chip, RGB1_ENABLE);
break;
case 3:
case 4:
case 5:
ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
pm8606_osc_disable(chip, RGB2_ENABLE);
break;
}
return ret;
}
static int pm860x_led_set(struct led_classdev *cdev,
enum led_brightness value)
{
struct pm860x_led *led = container_of(cdev, struct pm860x_led, cdev);
struct pm860x_chip *chip;
unsigned char buf[3];
int ret;
chip = led->chip;
mutex_lock(&led->lock);
led->brightness = value >> 3;
if ((led->current_brightness == 0) && led->brightness) {
led_power_set(chip, led->port, 1);
if (led->iset) {
pm860x_set_bits(led->i2c, led->reg_control,
LED_CURRENT_MASK, led->iset);
}
pm860x_set_bits(led->i2c, led->reg_blink,
LED_BLINK_MASK, LED_ON_CONTINUOUS);
pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
led->blink_mask);
}
pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
led->brightness);
if (led->brightness == 0) {
pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
ret = buf[0] & LED_PWM_MASK;
ret |= buf[1] & LED_PWM_MASK;
ret |= buf[2] & LED_PWM_MASK;
if (ret == 0) {
/* unset current since no led is lighting */
pm860x_set_bits(led->i2c, led->reg_control,
LED_CURRENT_MASK, 0);
pm860x_set_bits(led->i2c, PM8606_WLED3B,
led->blink_mask, 0);
led_power_set(chip, led->port, 0);
}
}
led->current_brightness = led->brightness;
dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
led->reg_control, led->brightness);
mutex_unlock(&led->lock);
return 0;
}
#ifdef CONFIG_OF
static int pm860x_led_dt_init(struct platform_device *pdev,
struct pm860x_led *data)
{
struct device_node *nproot, *np;
int iset = 0;
if (!dev_of_node(pdev->dev.parent))
return -ENODEV;
nproot = of_get_child_by_name(dev_of_node(pdev->dev.parent), "leds");
if (!nproot) {
dev_err(&pdev->dev, "failed to find leds node\n");
return -ENODEV;
}
for_each_available_child_of_node(nproot, np) {
if (of_node_name_eq(np, data->name)) {
of_property_read_u32(np, "marvell,88pm860x-iset",
&iset);
data->iset = PM8606_LED_CURRENT(iset);
of_node_put(np);
break;
}
}
of_node_put(nproot);
return 0;
}
#else
#define pm860x_led_dt_init(x, y) (-1)
#endif
static int pm860x_led_probe(struct platform_device *pdev)
{
struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
struct pm860x_led *data;
struct resource *res;
int ret = 0;
data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
if (!res) {
dev_err(&pdev->dev, "No REG resource for control\n");
return -ENXIO;
}
data->reg_control = res->start;
res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
if (!res) {
dev_err(&pdev->dev, "No REG resource for blink\n");
return -ENXIO;
}
data->reg_blink = res->start;
memset(data->name, 0, MFD_NAME_SIZE);
switch (pdev->id) {
case 0:
data->blink_mask = LED1_BLINK_EN;
sprintf(data->name, "led0-red");
break;
case 1:
data->blink_mask = LED1_BLINK_EN;
sprintf(data->name, "led0-green");
break;
case 2:
data->blink_mask = LED1_BLINK_EN;
sprintf(data->name, "led0-blue");
break;
case 3:
data->blink_mask = LED2_BLINK_EN;
sprintf(data->name, "led1-red");
break;
case 4:
data->blink_mask = LED2_BLINK_EN;
sprintf(data->name, "led1-green");
break;
case 5:
data->blink_mask = LED2_BLINK_EN;
sprintf(data->name, "led1-blue");
break;
}
data->chip = chip;
data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
data->port = pdev->id;
if (pm860x_led_dt_init(pdev, data))
if (pdata)
data->iset = pdata->iset;
data->current_brightness = 0;
data->cdev.name = data->name;
data->cdev.brightness_set_blocking = pm860x_led_set;
mutex_init(&data->lock);
ret = led_classdev_register(chip->dev, &data->cdev);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
return ret;
}
pm860x_led_set(&data->cdev, 0);
platform_set_drvdata(pdev, data);
return 0;
}
static int pm860x_led_remove(struct platform_device *pdev)
{
struct pm860x_led *data = platform_get_drvdata(pdev);
led_classdev_unregister(&data->cdev);
return 0;
}
static struct platform_driver pm860x_led_driver = {
.driver = {
.name = "88pm860x-led",
},
.probe = pm860x_led_probe,
.remove = pm860x_led_remove,
};
module_platform_driver(pm860x_led_driver);
MODULE_DESCRIPTION("LED driver for Marvell PM860x");
MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:88pm860x-led");