HWMON: Add JZ4740 ADC driver
Add support for reading the ADCIN pin of the ADC unit on JZ4740 SoCs. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: lm-sensors@lm-sensors.org Acked-by: Jean Delvare <khali@linux-fr.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1425/ Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>hifive-unleashed-5.1
Lars-Peter Clausen
Ralf Baechle
parent
2249071b3e
commit
7f983ba93d
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@ -446,6 +446,16 @@ config SENSORS_IT87
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This driver can also be built as a module. If so, the module
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will be called it87.
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config SENSORS_JZ4740
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tristate "Ingenic JZ4740 SoC ADC driver"
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depends on MACH_JZ4740 && MFD_JZ4740_ADC
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help
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If you say yes here you get support for reading adc values from the ADCIN
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pin on Ingenic JZ4740 SoC based boards.
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This driver can also be build as a module. If so, the module will be
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called jz4740-hwmon.
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config SENSORS_LM63
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tristate "National Semiconductor LM63 and LM64"
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depends on I2C
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@ -55,6 +55,7 @@ obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb.o
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obj-$(CONFIG_SENSORS_IBMAEM) += ibmaem.o
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obj-$(CONFIG_SENSORS_IBMPEX) += ibmpex.o
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obj-$(CONFIG_SENSORS_IT87) += it87.o
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obj-$(CONFIG_SENSORS_JZ4740) += jz4740-hwmon.o
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obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
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obj-$(CONFIG_SENSORS_K10TEMP) += k10temp.o
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obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
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@ -0,0 +1,230 @@
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/*
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* Copyright (C) 2009-2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SoC HWMON driver
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/completion.h>
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#include <linux/mfd/core.h>
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#include <linux/hwmon.h>
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struct jz4740_hwmon {
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struct resource *mem;
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void __iomem *base;
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int irq;
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struct mfd_cell *cell;
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struct device *hwmon;
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struct completion read_completion;
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struct mutex lock;
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};
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static ssize_t jz4740_hwmon_show_name(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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return sprintf(buf, "jz4740\n");
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}
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static irqreturn_t jz4740_hwmon_irq(int irq, void *data)
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{
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struct jz4740_hwmon *hwmon = data;
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complete(&hwmon->read_completion);
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return IRQ_HANDLED;
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}
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static ssize_t jz4740_hwmon_read_adcin(struct device *dev,
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struct device_attribute *dev_attr, char *buf)
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{
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struct jz4740_hwmon *hwmon = dev_get_drvdata(dev);
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struct completion *completion = &hwmon->read_completion;
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unsigned long t;
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unsigned long val;
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int ret;
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mutex_lock(&hwmon->lock);
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INIT_COMPLETION(*completion);
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enable_irq(hwmon->irq);
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hwmon->cell->enable(to_platform_device(dev));
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t = wait_for_completion_interruptible_timeout(completion, HZ);
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if (t > 0) {
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val = readw(hwmon->base) & 0xfff;
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val = (val * 3300) >> 12;
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ret = sprintf(buf, "%lu\n", val);
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} else {
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ret = t ? t : -ETIMEDOUT;
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}
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hwmon->cell->disable(to_platform_device(dev));
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disable_irq(hwmon->irq);
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mutex_unlock(&hwmon->lock);
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return ret;
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}
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static DEVICE_ATTR(name, S_IRUGO, jz4740_hwmon_show_name, NULL);
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static DEVICE_ATTR(in0_input, S_IRUGO, jz4740_hwmon_read_adcin, NULL);
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static struct attribute *jz4740_hwmon_attributes[] = {
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&dev_attr_name.attr,
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&dev_attr_in0_input.attr,
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NULL
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};
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static const struct attribute_group jz4740_hwmon_attr_group = {
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.attrs = jz4740_hwmon_attributes,
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};
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static int __devinit jz4740_hwmon_probe(struct platform_device *pdev)
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{
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int ret;
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struct jz4740_hwmon *hwmon;
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hwmon = kmalloc(sizeof(*hwmon), GFP_KERNEL);
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if (!hwmon) {
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dev_err(&pdev->dev, "Failed to allocate driver structure\n");
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return -ENOMEM;
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}
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hwmon->cell = pdev->dev.platform_data;
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hwmon->irq = platform_get_irq(pdev, 0);
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if (hwmon->irq < 0) {
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ret = hwmon->irq;
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dev_err(&pdev->dev, "Failed to get platform irq: %d\n", ret);
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goto err_free;
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}
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hwmon->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!hwmon->mem) {
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ret = -ENOENT;
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dev_err(&pdev->dev, "Failed to get platform mmio resource\n");
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goto err_free;
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}
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hwmon->mem = request_mem_region(hwmon->mem->start,
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resource_size(hwmon->mem), pdev->name);
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if (!hwmon->mem) {
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ret = -EBUSY;
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dev_err(&pdev->dev, "Failed to request mmio memory region\n");
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goto err_free;
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}
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hwmon->base = ioremap_nocache(hwmon->mem->start,
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resource_size(hwmon->mem));
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if (!hwmon->base) {
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ret = -EBUSY;
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dev_err(&pdev->dev, "Failed to ioremap mmio memory\n");
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goto err_release_mem_region;
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}
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init_completion(&hwmon->read_completion);
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mutex_init(&hwmon->lock);
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platform_set_drvdata(pdev, hwmon);
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ret = request_irq(hwmon->irq, jz4740_hwmon_irq, 0, pdev->name, hwmon);
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if (ret) {
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dev_err(&pdev->dev, "Failed to request irq: %d\n", ret);
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goto err_iounmap;
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}
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disable_irq(hwmon->irq);
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ret = sysfs_create_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
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if (ret) {
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dev_err(&pdev->dev, "Failed to create sysfs group: %d\n", ret);
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goto err_free_irq;
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}
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hwmon->hwmon = hwmon_device_register(&pdev->dev);
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if (IS_ERR(hwmon->hwmon)) {
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ret = PTR_ERR(hwmon->hwmon);
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goto err_remove_file;
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}
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return 0;
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err_remove_file:
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sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
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err_free_irq:
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free_irq(hwmon->irq, hwmon);
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err_iounmap:
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platform_set_drvdata(pdev, NULL);
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iounmap(hwmon->base);
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err_release_mem_region:
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release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
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err_free:
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kfree(hwmon);
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return ret;
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}
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static int __devexit jz4740_hwmon_remove(struct platform_device *pdev)
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{
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struct jz4740_hwmon *hwmon = platform_get_drvdata(pdev);
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hwmon_device_unregister(hwmon->hwmon);
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sysfs_remove_group(&pdev->dev.kobj, &jz4740_hwmon_attr_group);
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free_irq(hwmon->irq, hwmon);
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iounmap(hwmon->base);
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release_mem_region(hwmon->mem->start, resource_size(hwmon->mem));
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platform_set_drvdata(pdev, NULL);
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kfree(hwmon);
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return 0;
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}
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struct platform_driver jz4740_hwmon_driver = {
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.probe = jz4740_hwmon_probe,
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.remove = __devexit_p(jz4740_hwmon_remove),
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.driver = {
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.name = "jz4740-hwmon",
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.owner = THIS_MODULE,
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},
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};
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static int __init jz4740_hwmon_init(void)
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{
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return platform_driver_register(&jz4740_hwmon_driver);
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}
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module_init(jz4740_hwmon_init);
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static void __exit jz4740_hwmon_exit(void)
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{
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platform_driver_unregister(&jz4740_hwmon_driver);
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}
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module_exit(jz4740_hwmon_exit);
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MODULE_DESCRIPTION("JZ4740 SoC HWMON driver");
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:jz4740-hwmon");
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