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git://git.openwrt.org/openwrt/openwrt.git
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e1bfcceb93
SVN-Revision: 22463
284 lines
7.5 KiB
Diff
284 lines
7.5 KiB
Diff
From 548ab33dc0bd3c824e6002936ae0931158658a19 Mon Sep 17 00:00:00 2001
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From: Lars-Peter Clausen <lars@metafoo.de>
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Date: Sat, 19 Jun 2010 18:32:58 +0000
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Subject: [PATCH] HWMON: Add JZ4740 ADC driver
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Add support for reading the ADCIN pin of the ADC unit on JZ4740 SoCs.
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Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Cc: lm-sensors@lm-sensors.org
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Acked-by: Jean Delvare <khali@linux-fr.org>
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Cc: linux-mips@linux-mips.org
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Cc: linux-kernel@vger.kernel.org
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Patchwork: https://patchwork.linux-mips.org/patch/1425/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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drivers/hwmon/Kconfig | 10 ++
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drivers/hwmon/Makefile | 1 +
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drivers/hwmon/jz4740-hwmon.c | 230 ++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 241 insertions(+), 0 deletions(-)
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create mode 100644 drivers/hwmon/jz4740-hwmon.c
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--- a/drivers/hwmon/Kconfig
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+++ b/drivers/hwmon/Kconfig
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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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+
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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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+
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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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--- a/drivers/hwmon/Makefile
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+++ b/drivers/hwmon/Makefile
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@@ -55,6 +55,7 @@ obj-$(CONFIG_SENSORS_I5K_AMB) += i5k_amb
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obj-$(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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--- /dev/null
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+++ b/drivers/hwmon/jz4740-hwmon.c
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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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+
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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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+
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+#include <linux/completion.h>
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+#include <linux/mfd/core.h>
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+
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+#include <linux/hwmon.h>
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+
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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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+
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+ int irq;
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+
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+ struct mfd_cell *cell;
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+ struct device *hwmon;
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+
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+ struct completion read_completion;
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+
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+ struct mutex lock;
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+};
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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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+
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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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+
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+ complete(&hwmon->read_completion);
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+ return IRQ_HANDLED;
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+}
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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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+
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+ mutex_lock(&hwmon->lock);
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+
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+ INIT_COMPLETION(*completion);
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+
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+ enable_irq(hwmon->irq);
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+ hwmon->cell->enable(to_platform_device(dev));
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+
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+ t = wait_for_completion_interruptible_timeout(completion, HZ);
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+
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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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+
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+ hwmon->cell->disable(to_platform_device(dev));
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+ disable_irq(hwmon->irq);
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+
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+ mutex_unlock(&hwmon->lock);
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+
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+ return ret;
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+}
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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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+
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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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+
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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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+
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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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+
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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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+
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+ hwmon->cell = pdev->dev.platform_data;
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+
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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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+
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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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+
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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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+
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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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+
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+ init_completion(&hwmon->read_completion);
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+ mutex_init(&hwmon->lock);
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+
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+ platform_set_drvdata(pdev, hwmon);
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+
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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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+
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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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+
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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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+
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+ return 0;
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+
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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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+
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+ return ret;
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+}
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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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+
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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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+
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+ free_irq(hwmon->irq, hwmon);
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+
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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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+
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+ platform_set_drvdata(pdev, NULL);
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+ kfree(hwmon);
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+
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+ return 0;
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+}
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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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+
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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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+
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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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+
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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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