staging: iio: LPC32xx: ADC driver

This patch adds a 3-channel ADC driver for the LPC32xx ARM SoC

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 247 insertions, 0 deletions

diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index d9decea4fa6..592eabd85f3 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -193,4 +193,13 @@ config MAX1363_RING_BUFFER
           Say yes here to include ring buffer support in the MAX1363
           ADC driver.
 
+config LPC32XX_ADC
+        tristate "NXP LPC32XX ADC"
+        depends on ARCH_LPC32XX && !TOUCHSCREEN_LPC32XX
+        help
+          Say yes here to build support for the integrated ADC inside the
+          LPC32XX SoC. Note that this feature uses the same hardware as the
+          touchscreen driver, so you can only select one of the two drivers
+          (lpc32xx_adc or lpc32xx_ts). Provides direct access via sysfs.
+
 endmenu
diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
index ceee7f3c306..f83ab9551d8 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -37,3 +37,4 @@ obj-$(CONFIG_AD7192) += ad7192.o
 obj-$(CONFIG_ADT7310) += adt7310.o
 obj-$(CONFIG_ADT7410) += adt7410.o
 obj-$(CONFIG_AD7280) += ad7280a.o
+obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
diff --git a/drivers/staging/iio/adc/lpc32xx_adc.c b/drivers/staging/iio/adc/lpc32xx_adc.c
new file mode 100644
index 00000000000..dfc9033843a
--- /dev/null
+++ b/drivers/staging/iio/adc/lpc32xx_adc.c
@@ -0,0 +1,237 @@
+/*
+ *  lpc32xx_adc.c - Support for ADC in LPC32XX
+ *
+ *  3-channel, 10-bit ADC
+ *
+ *  Copyright (C) 2011, 2012 Roland Stigge <stigge@antcom.de>
+ *
+ *  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.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  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/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/completion.h>
+
+#include "../iio.h"
+#include "../sysfs.h"
+
+/*
+ * LPC32XX registers definitions
+ */
+#define LPC32XX_ADC_SELECT(x)   ((x) + 0x04)
+#define LPC32XX_ADC_CTRL(x)     ((x) + 0x08)
+#define LPC32XX_ADC_VALUE(x)    ((x) + 0x48)
+
+/* Bit definitions for LPC32XX_ADC_SELECT: */
+#define AD_REFm         0x00000200 /* constant, always write this value! */
+#define AD_REFp         0x00000080 /* constant, always write this value! */
+#define AD_IN           0x00000010 /* multiple of this is the */
+                                   /* channel number: 0, 1, 2 */
+#define AD_INTERNAL     0x00000004 /* constant, always write this value! */
+
+/* Bit definitions for LPC32XX_ADC_CTRL: */
+#define AD_STROBE       0x00000002
+#define AD_PDN_CTRL     0x00000004
+
+/* Bit definitions for LPC32XX_ADC_VALUE: */
+#define ADC_VALUE_MASK  0x000003FF
+
+#define MOD_NAME "lpc32xx-adc"
+
+struct lpc32xx_adc_info {
+        void __iomem *adc_base;
+        struct clk *clk;
+        struct completion completion;
+
+        u32 value;
+};
+
+static int lpc32xx_read_raw(struct iio_dev *indio_dev,
+                                struct iio_chan_spec const *chan,
+                                int *val,
+                                int *val2,
+                                long mask)
+{
+        struct lpc32xx_adc_info *info = iio_priv(indio_dev);
+
+        if (mask == 0) {
+                mutex_lock(&indio_dev->mlock);
+                clk_enable(info->clk);
+                /* Measurement setup */
+                __raw_writel(AD_INTERNAL | (chan->address) | AD_REFp | AD_REFm,
+                        LPC32XX_ADC_SELECT(info->adc_base));
+                /* Trigger conversion */
+                __raw_writel(AD_PDN_CTRL | AD_STROBE,
+                        LPC32XX_ADC_CTRL(info->adc_base));
+                wait_for_completion(&info->completion); /* set by ISR */
+                clk_disable(info->clk);
+                *val = info->value;
+                mutex_unlock(&indio_dev->mlock);
+
+                return IIO_VAL_INT;
+        }
+
+        return -EINVAL;
+}
+
+static const struct iio_info lpc32xx_adc_iio_info = {
+        .read_raw = &lpc32xx_read_raw,
+        .driver_module = THIS_MODULE,
+};
+
+#define LPC32XX_ADC_CHANNEL(_index) {           \
+        .type = IIO_VOLTAGE,                    \
+        .indexed = 1,                           \
+        .channel = _index,                      \
+        .address = AD_IN * _index,              \
+        .scan_index = _index,                   \
+}
+
+static struct iio_chan_spec lpc32xx_adc_iio_channels[] = {
+        LPC32XX_ADC_CHANNEL(0),
+        LPC32XX_ADC_CHANNEL(1),
+        LPC32XX_ADC_CHANNEL(2),
+};
+
+static irqreturn_t lpc32xx_adc_isr(int irq, void *dev_id)
+{
+        struct lpc32xx_adc_info *info = (struct lpc32xx_adc_info *) dev_id;
+
+        /* Read value and clear irq */
+        info->value = __raw_readl(LPC32XX_ADC_VALUE(info->adc_base)) &
+                                ADC_VALUE_MASK;
+        complete(&info->completion);
+
+        return IRQ_HANDLED;
+}
+
+static int __devinit lpc32xx_adc_probe(struct platform_device *pdev)
+{
+        struct lpc32xx_adc_info *info = NULL;
+        struct resource *res;
+        int retval = -ENODEV;
+        struct iio_dev *iodev = NULL;
+        int irq;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                dev_err(&pdev->dev, "failed to get platform I/O memory\n");
+                retval = -EBUSY;
+                goto errout1;
+        }
+
+        iodev = iio_allocate_device(sizeof(struct lpc32xx_adc_info));
+        if (!iodev) {
+                dev_err(&pdev->dev, "failed allocating iio device\n");
+                retval = -ENOMEM;
+                goto errout1;
+        }
+
+        info = iio_priv(iodev);
+
+        info->adc_base = ioremap(res->start, res->end - res->start + 1);
+        if (!info->adc_base) {
+                dev_err(&pdev->dev, "failed mapping memory\n");
+                retval = -EBUSY;
+                goto errout2;
+        }
+
+        info->clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(info->clk)) {
+                dev_err(&pdev->dev, "failed getting clock\n");
+                goto errout3;
+        }
+
+        irq = platform_get_irq(pdev, 0);
+        if ((irq < 0) || (irq >= NR_IRQS)) {
+                dev_err(&pdev->dev, "failed getting interrupt resource\n");
+                retval = -EINVAL;
+                goto errout4;
+        }
+
+        retval = request_irq(irq, lpc32xx_adc_isr, 0, MOD_NAME, info);
+        if (retval < 0) {
+                dev_err(&pdev->dev, "failed requesting interrupt\n");
+                goto errout4;
+        }
+
+        platform_set_drvdata(pdev, iodev);
+
+        init_completion(&info->completion);
+
+        iodev->name = MOD_NAME;
+        iodev->dev.parent = &pdev->dev;
+        iodev->info = &lpc32xx_adc_iio_info;
+        iodev->modes = INDIO_DIRECT_MODE;
+        iodev->channels = lpc32xx_adc_iio_channels;
+        iodev->num_channels = ARRAY_SIZE(lpc32xx_adc_iio_channels);
+
+        retval = iio_device_register(iodev);
+        if (retval)
+                goto errout5;
+
+        dev_info(&pdev->dev, "LPC32XX ADC driver loaded, IRQ %d\n", irq);
+
+        return 0;
+
+errout5:
+        free_irq(irq, iodev);
+errout4:
+        clk_put(info->clk);
+errout3:
+        iounmap(info->adc_base);
+errout2:
+        iio_free_device(iodev);
+errout1:
+        return retval;
+}
+
+static int __devexit lpc32xx_adc_remove(struct platform_device *pdev)
+{
+        struct iio_dev *iodev = platform_get_drvdata(pdev);
+        struct lpc32xx_adc_info *info = iio_priv(iodev);
+        int irq = platform_get_irq(pdev, 0);
+
+        iio_device_unregister(iodev);
+        free_irq(irq, iodev);
+        platform_set_drvdata(pdev, NULL);
+        clk_put(info->clk);
+        iounmap(info->adc_base);
+        iio_free_device(iodev);
+
+        return 0;
+}
+
+static struct platform_driver lpc32xx_adc_driver = {
+        .probe          = lpc32xx_adc_probe,
+        .remove         = __devexit_p(lpc32xx_adc_remove),
+        .driver         = {
+                .name   = MOD_NAME,
+                .owner  = THIS_MODULE,
+        },
+};
+
+module_platform_driver(lpc32xx_adc_driver);
+
+MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
+MODULE_DESCRIPTION("LPC32XX ADC driver");
+MODULE_LICENSE("GPL");