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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
293 lines
6.6 KiB
C
293 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* LED driver for WM831x status LEDs
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*
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* Copyright(C) 2009 Wolfson Microelectronics PLC.
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <linux/err.h>
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#include <linux/mfd/wm831x/core.h>
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#include <linux/mfd/wm831x/pdata.h>
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#include <linux/mfd/wm831x/status.h>
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#include <linux/module.h>
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struct wm831x_status {
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struct led_classdev cdev;
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struct wm831x *wm831x;
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struct mutex mutex;
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spinlock_t value_lock;
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int reg; /* Control register */
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int reg_val; /* Control register value */
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int blink;
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int blink_time;
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int blink_cyc;
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int src;
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enum led_brightness brightness;
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};
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#define to_wm831x_status(led_cdev) \
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container_of(led_cdev, struct wm831x_status, cdev)
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static void wm831x_status_set(struct wm831x_status *led)
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{
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unsigned long flags;
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mutex_lock(&led->mutex);
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led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK |
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WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK);
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spin_lock_irqsave(&led->value_lock, flags);
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led->reg_val |= led->src << WM831X_LED_SRC_SHIFT;
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if (led->blink) {
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led->reg_val |= 2 << WM831X_LED_MODE_SHIFT;
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led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT;
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led->reg_val |= led->blink_cyc;
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} else {
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if (led->brightness != LED_OFF)
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led->reg_val |= 1 << WM831X_LED_MODE_SHIFT;
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}
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spin_unlock_irqrestore(&led->value_lock, flags);
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wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
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mutex_unlock(&led->mutex);
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}
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static int wm831x_status_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct wm831x_status *led = to_wm831x_status(led_cdev);
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unsigned long flags;
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spin_lock_irqsave(&led->value_lock, flags);
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led->brightness = value;
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if (value == LED_OFF)
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led->blink = 0;
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spin_unlock_irqrestore(&led->value_lock, flags);
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wm831x_status_set(led);
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return 0;
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}
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static int wm831x_status_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 wm831x_status *led = to_wm831x_status(led_cdev);
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unsigned long flags;
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int ret = 0;
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/* Pick some defaults if we've not been given times */
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if (*delay_on == 0 && *delay_off == 0) {
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*delay_on = 250;
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*delay_off = 250;
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}
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spin_lock_irqsave(&led->value_lock, flags);
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/* We only have a limited selection of settings, see if we can
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* support the configuration we're being given */
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switch (*delay_on) {
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case 1000:
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led->blink_time = 0;
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break;
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case 250:
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led->blink_time = 1;
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break;
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case 125:
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led->blink_time = 2;
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break;
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case 62:
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case 63:
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/* Actually 62.5ms */
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led->blink_time = 3;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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if (ret == 0) {
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switch (*delay_off / *delay_on) {
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case 1:
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led->blink_cyc = 0;
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break;
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case 3:
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led->blink_cyc = 1;
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break;
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case 4:
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led->blink_cyc = 2;
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break;
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case 8:
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led->blink_cyc = 3;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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}
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if (ret == 0)
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led->blink = 1;
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else
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led->blink = 0;
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spin_unlock_irqrestore(&led->value_lock, flags);
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wm831x_status_set(led);
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return ret;
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}
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static const char * const led_src_texts[] = {
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"otp",
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"power",
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"charger",
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"soft",
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};
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static ssize_t wm831x_status_src_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 wm831x_status *led = to_wm831x_status(led_cdev);
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int i;
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ssize_t ret = 0;
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mutex_lock(&led->mutex);
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for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
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if (i == led->src)
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ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
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else
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ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
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mutex_unlock(&led->mutex);
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ret += sprintf(&buf[ret], "\n");
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return ret;
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}
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static ssize_t wm831x_status_src_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t size)
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{
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struct led_classdev *led_cdev = dev_get_drvdata(dev);
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struct wm831x_status *led = to_wm831x_status(led_cdev);
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int i;
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i = sysfs_match_string(led_src_texts, buf);
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if (i >= 0) {
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mutex_lock(&led->mutex);
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led->src = i;
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mutex_unlock(&led->mutex);
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wm831x_status_set(led);
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}
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return size;
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}
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static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
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static struct attribute *wm831x_status_attrs[] = {
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&dev_attr_src.attr,
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NULL
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};
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ATTRIBUTE_GROUPS(wm831x_status);
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static int wm831x_status_probe(struct platform_device *pdev)
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{
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struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
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struct wm831x_pdata *chip_pdata;
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struct wm831x_status_pdata pdata;
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struct wm831x_status *drvdata;
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struct resource *res;
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int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
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int ret;
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res = platform_get_resource(pdev, IORESOURCE_REG, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "No register resource\n");
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return -EINVAL;
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}
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drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
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GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->wm831x = wm831x;
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drvdata->reg = res->start;
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if (dev_get_platdata(wm831x->dev))
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chip_pdata = dev_get_platdata(wm831x->dev);
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else
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chip_pdata = NULL;
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memset(&pdata, 0, sizeof(pdata));
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if (chip_pdata && chip_pdata->status[id])
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memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
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else
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pdata.name = dev_name(&pdev->dev);
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mutex_init(&drvdata->mutex);
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spin_lock_init(&drvdata->value_lock);
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/* We cache the configuration register and read startup values
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* from it. */
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drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
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if (drvdata->reg_val & WM831X_LED_MODE_MASK)
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drvdata->brightness = LED_FULL;
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else
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drvdata->brightness = LED_OFF;
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/* Set a default source if configured, otherwise leave the
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* current hardware setting.
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*/
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if (pdata.default_src == WM831X_STATUS_PRESERVE) {
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drvdata->src = drvdata->reg_val;
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drvdata->src &= WM831X_LED_SRC_MASK;
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drvdata->src >>= WM831X_LED_SRC_SHIFT;
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} else {
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drvdata->src = pdata.default_src - 1;
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}
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drvdata->cdev.name = pdata.name;
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drvdata->cdev.default_trigger = pdata.default_trigger;
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drvdata->cdev.brightness_set_blocking = wm831x_status_brightness_set;
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drvdata->cdev.blink_set = wm831x_status_blink_set;
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drvdata->cdev.groups = wm831x_status_groups;
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ret = devm_led_classdev_register(wm831x->dev, &drvdata->cdev);
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static struct platform_driver wm831x_status_driver = {
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.driver = {
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.name = "wm831x-status",
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},
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.probe = wm831x_status_probe,
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};
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module_platform_driver(wm831x_status_driver);
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MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
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MODULE_DESCRIPTION("WM831x status LED driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:wm831x-status");
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