diff options
Diffstat (limited to 'drivers/hwmon/jz4740-hwmon.c')
| -rw-r--r-- | drivers/hwmon/jz4740-hwmon.c | 199 |
1 files changed, 0 insertions, 199 deletions
diff --git a/drivers/hwmon/jz4740-hwmon.c b/drivers/hwmon/jz4740-hwmon.c deleted file mode 100644 index e0d66b9590ab..000000000000 --- a/drivers/hwmon/jz4740-hwmon.c +++ /dev/null @@ -1,199 +0,0 @@ -/* - * Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de> - * JZ4740 SoC HWMON driver - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 675 Mass Ave, Cambridge, MA 02139, USA. - * - */ - -#include <linux/err.h> -#include <linux/interrupt.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/io.h> - -#include <linux/completion.h> -#include <linux/mfd/core.h> - -#include <linux/hwmon.h> - -struct jz4740_hwmon { - struct resource *mem; - void __iomem *base; - - int irq; - - const struct mfd_cell *cell; - struct device *hwmon; - - struct completion read_completion; - - struct mutex lock; -}; - -static ssize_t jz4740_hwmon_show_name(struct device *dev, - struct device_attribute *dev_attr, char *buf) -{ - return sprintf(buf, "jz4740\n"); -} - -static irqreturn_t jz4740_hwmon_irq(int irq, void *data) -{ - struct jz4740_hwmon *hwmon = data; - - complete(&hwmon->read_completion); - return IRQ_HANDLED; -} - -static ssize_t jz4740_hwmon_read_adcin(struct device *dev, - struct device_attribute *dev_attr, char *buf) -{ - struct jz4740_hwmon *hwmon = dev_get_drvdata(dev); - struct completion *completion = &hwmon->read_completion; - long t; - unsigned long val; - int ret; - - mutex_lock(&hwmon->lock); - - INIT_COMPLETION(*completion); - - enable_irq(hwmon->irq); - hwmon->cell->enable(to_platform_device(dev)); - - t = wait_for_completion_interruptible_timeout(completion, HZ); - - if (t > 0) { - val = readw(hwmon->base) & 0xfff; - val = (val * 3300) >> 12; - ret = sprintf(buf, "%lu\n", val); - } else { - ret = t ? t : -ETIMEDOUT; - } - - hwmon->cell->disable(to_platform_device(dev)); - disable_irq(hwmon->irq); - - mutex_unlock(&hwmon->lock); - - return ret; -} - -static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL); -static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL); - -static struct attribute *jz4740_hwmon_attributes[] = { - &dev_attr_name.attr, - &dev_attr_in0_input.attr, - NULL -}; - -static const struct attribute_group jz4740_hwmon_attr_group = { - .attrs = jz4740_hwmon_attributes, -}; - -static int jz4740_hwmon_probe(struct platform_device *pdev) -{ - int ret; - struct jz4740_hwmon *hwmon; - - hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL); - if (!hwmon) - return -ENOMEM; - - hwmon->cell = mfd_get_cell(pdev); - - hwmon->irq = platform_get_irq(pdev, 0); - if (hwmon->irq < 0) { - dev_err(&pdev->dev, "Failed to get platform irq: %d\n", - hwmon->irq); - return hwmon->irq; - } - - hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); - if (!hwmon->mem) { - dev_err(&pdev->dev, "Failed to get platform mmio resource\n"); - return -ENOENT; - } - - hwmon->mem = devm_request_mem_region(&pdev->dev, hwmon->mem->start, - resource_size(hwmon->mem), pdev->name); - if (!hwmon->mem) { - dev_err(&pdev->dev, "Failed to request mmio memory region\n"); - return -EBUSY; - } - - hwmon->base = devm_ioremap_nocache(&pdev->dev, hwmon->mem->start, - resource_size(hwmon->mem)); - if (!hwmon->base) { - dev_err(&pdev->dev, "Failed to ioremap mmio memory\n"); - return -EBUSY; - } - - init_completion(&hwmon->read_completion); - mutex_init(&hwmon->lock); - - platform_set_drvdata(pdev, hwmon); - - ret = devm_request_irq(&pdev->dev, hwmon->irq, jz4740_hwmon_irq, 0, - pdev->name, hwmon); - if (ret) { - dev_err(&pdev->dev, "Failed to request irq: %d\n", ret); - return ret; - } - disable_irq(hwmon->irq); - - ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group); - if (ret) { - dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret); - return ret; - } - - hwmon->hwmon = hwmon_device_register(&pdev->dev); - if (IS_ERR(hwmon->hwmon)) { - ret = PTR_ERR(hwmon->hwmon); - goto err_remove_file; - } - - return 0; - -err_remove_file: - sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group); - return ret; -} - -static int jz4740_hwmon_remove(struct platform_device *pdev) -{ - struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev); - - hwmon_device_unregister(hwmon->hwmon); - sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group); - - return 0; -} - -static struct platform_driver jz4740_hwmon_driver = { - .probe = jz4740_hwmon_probe, - .remove = jz4740_hwmon_remove, - .driver = { - .name = "jz4740-hwmon", - .owner = THIS_MODULE, - }, -}; - -module_platform_driver(jz4740_hwmon_driver); - -MODULE_DESCRIPTION("JZ4740 SoC HWMON driver"); -MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:jz4740-hwmon"); |