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642 lines
15 KiB
642 lines
15 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs |
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* |
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* Copyright (C) 2010 LaCie |
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* |
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* Author: Simon Guinot <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/irq.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/platform_device.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/leds.h> |
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#include <linux/of.h> |
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#include <linux/of_platform.h> |
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struct netxbig_gpio_ext { |
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struct gpio_desc **addr; |
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int num_addr; |
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struct gpio_desc **data; |
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int num_data; |
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struct gpio_desc *enable; |
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}; |
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enum netxbig_led_mode { |
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NETXBIG_LED_OFF, |
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NETXBIG_LED_ON, |
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NETXBIG_LED_SATA, |
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NETXBIG_LED_TIMER1, |
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NETXBIG_LED_TIMER2, |
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NETXBIG_LED_MODE_NUM, |
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}; |
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#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM |
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struct netxbig_led_timer { |
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unsigned long delay_on; |
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unsigned long delay_off; |
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enum netxbig_led_mode mode; |
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}; |
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struct netxbig_led { |
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const char *name; |
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const char *default_trigger; |
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int mode_addr; |
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int *mode_val; |
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int bright_addr; |
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int bright_max; |
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}; |
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struct netxbig_led_platform_data { |
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struct netxbig_gpio_ext *gpio_ext; |
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struct netxbig_led_timer *timer; |
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int num_timer; |
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struct netxbig_led *leds; |
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int num_leds; |
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}; |
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/* |
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* GPIO extension bus. |
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*/ |
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static DEFINE_SPINLOCK(gpio_ext_lock); |
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static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr) |
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{ |
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int pin; |
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for (pin = 0; pin < gpio_ext->num_addr; pin++) |
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gpiod_set_value(gpio_ext->addr[pin], (addr >> pin) & 1); |
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} |
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static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data) |
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{ |
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int pin; |
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for (pin = 0; pin < gpio_ext->num_data; pin++) |
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gpiod_set_value(gpio_ext->data[pin], (data >> pin) & 1); |
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} |
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static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext) |
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{ |
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/* Enable select is done on the raising edge. */ |
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gpiod_set_value(gpio_ext->enable, 0); |
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gpiod_set_value(gpio_ext->enable, 1); |
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} |
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static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext, |
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int addr, int value) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave(&gpio_ext_lock, flags); |
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gpio_ext_set_addr(gpio_ext, addr); |
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gpio_ext_set_data(gpio_ext, value); |
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gpio_ext_enable_select(gpio_ext); |
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spin_unlock_irqrestore(&gpio_ext_lock, flags); |
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} |
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/* |
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* Class LED driver. |
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*/ |
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struct netxbig_led_data { |
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struct netxbig_gpio_ext *gpio_ext; |
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struct led_classdev cdev; |
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int mode_addr; |
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int *mode_val; |
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int bright_addr; |
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struct netxbig_led_timer *timer; |
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int num_timer; |
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enum netxbig_led_mode mode; |
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int sata; |
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spinlock_t lock; |
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}; |
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static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode, |
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unsigned long delay_on, |
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unsigned long delay_off, |
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struct netxbig_led_timer *timer, |
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int num_timer) |
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{ |
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int i; |
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for (i = 0; i < num_timer; i++) { |
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if (timer[i].delay_on == delay_on && |
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timer[i].delay_off == delay_off) { |
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*mode = timer[i].mode; |
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return 0; |
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} |
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} |
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return -EINVAL; |
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} |
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static int netxbig_led_blink_set(struct led_classdev *led_cdev, |
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unsigned long *delay_on, |
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unsigned long *delay_off) |
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{ |
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struct netxbig_led_data *led_dat = |
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container_of(led_cdev, struct netxbig_led_data, cdev); |
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enum netxbig_led_mode mode; |
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int mode_val; |
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int ret; |
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/* Look for a LED mode with the requested timer frequency. */ |
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ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off, |
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led_dat->timer, led_dat->num_timer); |
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if (ret < 0) |
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return ret; |
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mode_val = led_dat->mode_val[mode]; |
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if (mode_val == NETXBIG_LED_INVALID_MODE) |
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return -EINVAL; |
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spin_lock_irq(&led_dat->lock); |
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gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); |
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led_dat->mode = mode; |
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spin_unlock_irq(&led_dat->lock); |
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return 0; |
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} |
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static void netxbig_led_set(struct led_classdev *led_cdev, |
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enum led_brightness value) |
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{ |
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struct netxbig_led_data *led_dat = |
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container_of(led_cdev, struct netxbig_led_data, cdev); |
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enum netxbig_led_mode mode; |
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int mode_val; |
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int set_brightness = 1; |
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unsigned long flags; |
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spin_lock_irqsave(&led_dat->lock, flags); |
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if (value == LED_OFF) { |
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mode = NETXBIG_LED_OFF; |
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set_brightness = 0; |
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} else { |
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if (led_dat->sata) |
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mode = NETXBIG_LED_SATA; |
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else if (led_dat->mode == NETXBIG_LED_OFF) |
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mode = NETXBIG_LED_ON; |
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else /* Keep 'timer' mode. */ |
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mode = led_dat->mode; |
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} |
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mode_val = led_dat->mode_val[mode]; |
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gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); |
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led_dat->mode = mode; |
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/* |
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* Note that the brightness register is shared between all the |
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* SATA LEDs. So, change the brightness setting for a single |
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* SATA LED will affect all the others. |
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*/ |
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if (set_brightness) |
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gpio_ext_set_value(led_dat->gpio_ext, |
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led_dat->bright_addr, value); |
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spin_unlock_irqrestore(&led_dat->lock, flags); |
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} |
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static ssize_t sata_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buff, size_t count) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct netxbig_led_data *led_dat = |
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container_of(led_cdev, struct netxbig_led_data, cdev); |
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unsigned long enable; |
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enum netxbig_led_mode mode; |
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int mode_val; |
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int ret; |
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ret = kstrtoul(buff, 10, &enable); |
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if (ret < 0) |
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return ret; |
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enable = !!enable; |
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spin_lock_irq(&led_dat->lock); |
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if (led_dat->sata == enable) { |
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ret = count; |
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goto exit_unlock; |
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} |
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if (led_dat->mode != NETXBIG_LED_ON && |
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led_dat->mode != NETXBIG_LED_SATA) |
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mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */ |
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else if (enable) |
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mode = NETXBIG_LED_SATA; |
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else |
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mode = NETXBIG_LED_ON; |
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mode_val = led_dat->mode_val[mode]; |
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if (mode_val == NETXBIG_LED_INVALID_MODE) { |
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ret = -EINVAL; |
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goto exit_unlock; |
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} |
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gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val); |
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led_dat->mode = mode; |
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led_dat->sata = enable; |
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ret = count; |
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exit_unlock: |
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spin_unlock_irq(&led_dat->lock); |
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return ret; |
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} |
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static ssize_t sata_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct led_classdev *led_cdev = dev_get_drvdata(dev); |
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struct netxbig_led_data *led_dat = |
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container_of(led_cdev, struct netxbig_led_data, cdev); |
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return sprintf(buf, "%d\n", led_dat->sata); |
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} |
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static DEVICE_ATTR_RW(sata); |
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static struct attribute *netxbig_led_attrs[] = { |
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&dev_attr_sata.attr, |
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NULL |
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}; |
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ATTRIBUTE_GROUPS(netxbig_led); |
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static int create_netxbig_led(struct platform_device *pdev, |
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struct netxbig_led_platform_data *pdata, |
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struct netxbig_led_data *led_dat, |
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const struct netxbig_led *template) |
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{ |
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spin_lock_init(&led_dat->lock); |
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led_dat->gpio_ext = pdata->gpio_ext; |
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led_dat->cdev.name = template->name; |
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led_dat->cdev.default_trigger = template->default_trigger; |
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led_dat->cdev.blink_set = netxbig_led_blink_set; |
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led_dat->cdev.brightness_set = netxbig_led_set; |
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/* |
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* Because the GPIO extension bus don't allow to read registers |
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* value, there is no way to probe the LED initial state. |
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* So, the initial sysfs LED value for the "brightness" and "sata" |
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* attributes are inconsistent. |
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* |
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* Note that the initial LED state can't be reconfigured. |
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* The reason is that the LED behaviour must stay uniform during |
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* the whole boot process (bootloader+linux). |
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*/ |
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led_dat->sata = 0; |
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led_dat->cdev.brightness = LED_OFF; |
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led_dat->cdev.max_brightness = template->bright_max; |
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led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME; |
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led_dat->mode_addr = template->mode_addr; |
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led_dat->mode_val = template->mode_val; |
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led_dat->bright_addr = template->bright_addr; |
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led_dat->timer = pdata->timer; |
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led_dat->num_timer = pdata->num_timer; |
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/* |
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* If available, expose the SATA activity blink capability through |
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* a "sata" sysfs attribute. |
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*/ |
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if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) |
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led_dat->cdev.groups = netxbig_led_groups; |
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return devm_led_classdev_register(&pdev->dev, &led_dat->cdev); |
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} |
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/** |
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* netxbig_gpio_ext_remove() - Clean up GPIO extension data |
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* @data: managed resource data to clean up |
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* |
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* Since we pick GPIO descriptors from another device than the device our |
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* driver is probing to, we need to register a specific callback to free |
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* these up using managed resources. |
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*/ |
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static void netxbig_gpio_ext_remove(void *data) |
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{ |
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struct netxbig_gpio_ext *gpio_ext = data; |
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int i; |
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for (i = 0; i < gpio_ext->num_addr; i++) |
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gpiod_put(gpio_ext->addr[i]); |
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for (i = 0; i < gpio_ext->num_data; i++) |
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gpiod_put(gpio_ext->data[i]); |
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gpiod_put(gpio_ext->enable); |
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} |
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/** |
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* netxbig_gpio_ext_get() - Obtain GPIO extension device data |
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* @dev: main LED device |
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* @gpio_ext_dev: the GPIO extension device |
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* @gpio_ext: the data structure holding the GPIO extension data |
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* |
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* This function walks the subdevice that only contain GPIO line |
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* handles in the device tree and obtains the GPIO descriptors from that |
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* device. |
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*/ |
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static int netxbig_gpio_ext_get(struct device *dev, |
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struct device *gpio_ext_dev, |
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struct netxbig_gpio_ext *gpio_ext) |
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{ |
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struct gpio_desc **addr, **data; |
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int num_addr, num_data; |
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struct gpio_desc *gpiod; |
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int ret; |
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int i; |
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ret = gpiod_count(gpio_ext_dev, "addr"); |
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if (ret < 0) { |
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dev_err(dev, |
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"Failed to count GPIOs in DT property addr-gpios\n"); |
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return ret; |
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} |
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num_addr = ret; |
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addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL); |
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if (!addr) |
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return -ENOMEM; |
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|
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/* |
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* We cannot use devm_ managed resources with these GPIO descriptors |
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* since they are associated with the "GPIO extension device" which |
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* does not probe any driver. The device tree parser will however |
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* populate a platform device for it so we can anyway obtain the |
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* GPIO descriptors from the device. |
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*/ |
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for (i = 0; i < num_addr; i++) { |
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gpiod = gpiod_get_index(gpio_ext_dev, "addr", i, |
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GPIOD_OUT_LOW); |
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if (IS_ERR(gpiod)) |
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return PTR_ERR(gpiod); |
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gpiod_set_consumer_name(gpiod, "GPIO extension addr"); |
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addr[i] = gpiod; |
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} |
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gpio_ext->addr = addr; |
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gpio_ext->num_addr = num_addr; |
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ret = gpiod_count(gpio_ext_dev, "data"); |
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if (ret < 0) { |
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dev_err(dev, |
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"Failed to count GPIOs in DT property data-gpios\n"); |
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return ret; |
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} |
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num_data = ret; |
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data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL); |
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if (!data) |
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return -ENOMEM; |
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for (i = 0; i < num_data; i++) { |
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gpiod = gpiod_get_index(gpio_ext_dev, "data", i, |
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GPIOD_OUT_LOW); |
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if (IS_ERR(gpiod)) |
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return PTR_ERR(gpiod); |
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gpiod_set_consumer_name(gpiod, "GPIO extension data"); |
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data[i] = gpiod; |
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} |
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gpio_ext->data = data; |
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gpio_ext->num_data = num_data; |
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gpiod = gpiod_get(gpio_ext_dev, "enable", GPIOD_OUT_LOW); |
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if (IS_ERR(gpiod)) { |
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dev_err(dev, |
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"Failed to get GPIO from DT property enable-gpio\n"); |
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return PTR_ERR(gpiod); |
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} |
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gpiod_set_consumer_name(gpiod, "GPIO extension enable"); |
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gpio_ext->enable = gpiod; |
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return devm_add_action_or_reset(dev, netxbig_gpio_ext_remove, gpio_ext); |
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} |
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static int netxbig_leds_get_of_pdata(struct device *dev, |
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struct netxbig_led_platform_data *pdata) |
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{ |
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struct device_node *np = dev_of_node(dev); |
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struct device_node *gpio_ext_np; |
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struct platform_device *gpio_ext_pdev; |
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struct device *gpio_ext_dev; |
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struct device_node *child; |
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struct netxbig_gpio_ext *gpio_ext; |
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struct netxbig_led_timer *timers; |
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struct netxbig_led *leds, *led; |
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int num_timers; |
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int num_leds = 0; |
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int ret; |
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int i; |
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/* GPIO extension */ |
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gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0); |
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if (!gpio_ext_np) { |
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dev_err(dev, "Failed to get DT handle gpio-ext\n"); |
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return -EINVAL; |
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} |
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gpio_ext_pdev = of_find_device_by_node(gpio_ext_np); |
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if (!gpio_ext_pdev) { |
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dev_err(dev, "Failed to find platform device for gpio-ext\n"); |
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return -ENODEV; |
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} |
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gpio_ext_dev = &gpio_ext_pdev->dev; |
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gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL); |
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if (!gpio_ext) { |
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of_node_put(gpio_ext_np); |
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ret = -ENOMEM; |
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goto put_device; |
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} |
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ret = netxbig_gpio_ext_get(dev, gpio_ext_dev, gpio_ext); |
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of_node_put(gpio_ext_np); |
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if (ret) |
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goto put_device; |
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pdata->gpio_ext = gpio_ext; |
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|
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/* Timers (optional) */ |
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ret = of_property_count_u32_elems(np, "timers"); |
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if (ret > 0) { |
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if (ret % 3) { |
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ret = -EINVAL; |
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goto put_device; |
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} |
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num_timers = ret / 3; |
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timers = devm_kcalloc(dev, num_timers, sizeof(*timers), |
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GFP_KERNEL); |
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if (!timers) { |
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ret = -ENOMEM; |
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goto put_device; |
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} |
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for (i = 0; i < num_timers; i++) { |
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u32 tmp; |
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of_property_read_u32_index(np, "timers", 3 * i, |
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&timers[i].mode); |
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if (timers[i].mode >= NETXBIG_LED_MODE_NUM) { |
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ret = -EINVAL; |
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goto put_device; |
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} |
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of_property_read_u32_index(np, "timers", |
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3 * i + 1, &tmp); |
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timers[i].delay_on = tmp; |
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of_property_read_u32_index(np, "timers", |
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3 * i + 2, &tmp); |
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timers[i].delay_off = tmp; |
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} |
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pdata->timer = timers; |
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pdata->num_timer = num_timers; |
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} |
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|
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/* LEDs */ |
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num_leds = of_get_available_child_count(np); |
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if (!num_leds) { |
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dev_err(dev, "No LED subnodes found in DT\n"); |
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ret = -ENODEV; |
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goto put_device; |
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} |
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leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL); |
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if (!leds) { |
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ret = -ENOMEM; |
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goto put_device; |
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} |
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led = leds; |
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for_each_available_child_of_node(np, child) { |
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const char *string; |
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int *mode_val; |
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int num_modes; |
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|
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ret = of_property_read_u32(child, "mode-addr", |
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&led->mode_addr); |
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if (ret) |
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goto err_node_put; |
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ret = of_property_read_u32(child, "bright-addr", |
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&led->bright_addr); |
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if (ret) |
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goto err_node_put; |
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|
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ret = of_property_read_u32(child, "max-brightness", |
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&led->bright_max); |
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if (ret) |
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goto err_node_put; |
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mode_val = |
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devm_kcalloc(dev, |
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NETXBIG_LED_MODE_NUM, sizeof(*mode_val), |
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GFP_KERNEL); |
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if (!mode_val) { |
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ret = -ENOMEM; |
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goto err_node_put; |
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} |
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|
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for (i = 0; i < NETXBIG_LED_MODE_NUM; i++) |
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mode_val[i] = NETXBIG_LED_INVALID_MODE; |
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ret = of_property_count_u32_elems(child, "mode-val"); |
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if (ret < 0 || ret % 2) { |
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ret = -EINVAL; |
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goto err_node_put; |
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} |
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num_modes = ret / 2; |
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if (num_modes > NETXBIG_LED_MODE_NUM) { |
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ret = -EINVAL; |
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goto err_node_put; |
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} |
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|
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for (i = 0; i < num_modes; i++) { |
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int mode; |
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int val; |
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|
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of_property_read_u32_index(child, |
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"mode-val", 2 * i, &mode); |
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of_property_read_u32_index(child, |
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"mode-val", 2 * i + 1, &val); |
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if (mode >= NETXBIG_LED_MODE_NUM) { |
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ret = -EINVAL; |
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goto err_node_put; |
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} |
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mode_val[mode] = val; |
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} |
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led->mode_val = mode_val; |
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|
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if (!of_property_read_string(child, "label", &string)) |
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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); |
|
put_device: |
|
put_device(gpio_ext_dev); |
|
return ret; |
|
} |
|
|
|
static const struct of_device_id of_netxbig_leds_match[] = { |
|
{ .compatible = "lacie,netxbig-leds", }, |
|
{}, |
|
}; |
|
MODULE_DEVICE_TABLE(of, of_netxbig_leds_match); |
|
|
|
static int netxbig_led_probe(struct platform_device *pdev) |
|
{ |
|
struct netxbig_led_platform_data *pdata; |
|
struct netxbig_led_data *leds_data; |
|
int i; |
|
int ret; |
|
|
|
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_kcalloc(&pdev->dev, |
|
pdata->num_leds, sizeof(*leds_data), |
|
GFP_KERNEL); |
|
if (!leds_data) |
|
return -ENOMEM; |
|
|
|
for (i = 0; i < pdata->num_leds; i++) { |
|
ret = create_netxbig_led(pdev, pdata, |
|
&leds_data[i], &pdata->leds[i]); |
|
if (ret < 0) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct platform_driver netxbig_led_driver = { |
|
.probe = netxbig_led_probe, |
|
.driver = { |
|
.name = "leds-netxbig", |
|
.of_match_table = of_netxbig_leds_match, |
|
}, |
|
}; |
|
|
|
module_platform_driver(netxbig_led_driver); |
|
|
|
MODULE_AUTHOR("Simon Guinot <[email protected]>"); |
|
MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards"); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("platform:leds-netxbig");
|
|
|