To compile this driver as a module, choose M here: the module will be
called lpc18xx_adc.
+config LPC32XX_ADC
+ tristate "NXP LPC32XX ADC"
+ depends on ARCH_LPC32XX || COMPILE_TEST
+ depends on HAS_IOMEM
+ 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 should either select only one of the two
+ drivers (lpc32xx_adc or lpc32xx_ts) or, in the OpenFirmware case,
+ activate only one via device tree selection. Provides direct access
+ via sysfs.
+
config LTC2485
tristate "Linear Technology LTC2485 ADC driver"
depends on I2C
obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
+obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
obj-$(CONFIG_LTC2485) += ltc2485.o
obj-$(CONFIG_MAX1027) += max1027.o
obj-$(CONFIG_MAX11100) += max11100.o
--- /dev/null
+/*
+ * 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 <linux/of.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+/*
+ * LPC32XX registers definitions
+ */
+#define LPC32XXAD_SELECT(x) ((x) + 0x04)
+#define LPC32XXAD_CTRL(x) ((x) + 0x08)
+#define LPC32XXAD_VALUE(x) ((x) + 0x48)
+
+/* Bit definitions for LPC32XXAD_SELECT: */
+/* constant, always write this value! */
+#define LPC32XXAD_REFm 0x00000200
+/* constant, always write this value! */
+#define LPC32XXAD_REFp 0x00000080
+ /* multiple of this is the channel number: 0, 1, 2 */
+#define LPC32XXAD_IN 0x00000010
+/* constant, always write this value! */
+#define LPC32XXAD_INTERNAL 0x00000004
+
+/* Bit definitions for LPC32XXAD_CTRL: */
+#define LPC32XXAD_STROBE 0x00000002
+#define LPC32XXAD_PDN_CTRL 0x00000004
+
+/* Bit definitions for LPC32XXAD_VALUE: */
+#define LPC32XXAD_VALUE_MASK 0x000003FF
+
+#define LPC32XXAD_NAME "lpc32xx-adc"
+
+struct lpc32xx_adc_state {
+ 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_state *st = iio_priv(indio_dev);
+
+ if (mask == IIO_CHAN_INFO_RAW) {
+ mutex_lock(&indio_dev->mlock);
+ clk_prepare_enable(st->clk);
+ /* Measurement setup */
+ __raw_writel(LPC32XXAD_INTERNAL | (chan->address) |
+ LPC32XXAD_REFp | LPC32XXAD_REFm,
+ LPC32XXAD_SELECT(st->adc_base));
+ /* Trigger conversion */
+ __raw_writel(LPC32XXAD_PDN_CTRL | LPC32XXAD_STROBE,
+ LPC32XXAD_CTRL(st->adc_base));
+ wait_for_completion(&st->completion); /* set by ISR */
+ clk_disable_unprepare(st->clk);
+ *val = st->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, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .address = LPC32XXAD_IN * _index, \
+ .scan_index = _index, \
+}
+
+static const 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_state *st = dev_id;
+
+ /* Read value and clear irq */
+ st->value = __raw_readl(LPC32XXAD_VALUE(st->adc_base)) &
+ LPC32XXAD_VALUE_MASK;
+ complete(&st->completion);
+
+ return IRQ_HANDLED;
+}
+
+static int lpc32xx_adc_probe(struct platform_device *pdev)
+{
+ struct lpc32xx_adc_state *st = 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");
+ return -ENXIO;
+ }
+
+ iodev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
+ if (!iodev)
+ return -ENOMEM;
+
+ st = iio_priv(iodev);
+
+ st->adc_base = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!st->adc_base) {
+ dev_err(&pdev->dev, "failed mapping memory\n");
+ return -EBUSY;
+ }
+
+ st->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(st->clk)) {
+ dev_err(&pdev->dev, "failed getting clock\n");
+ return PTR_ERR(st->clk);
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0) {
+ dev_err(&pdev->dev, "failed getting interrupt resource\n");
+ return -ENXIO;
+ }
+
+ retval = devm_request_irq(&pdev->dev, irq, lpc32xx_adc_isr, 0,
+ LPC32XXAD_NAME, st);
+ if (retval < 0) {
+ dev_err(&pdev->dev, "failed requesting interrupt\n");
+ return retval;
+ }
+
+ platform_set_drvdata(pdev, iodev);
+
+ init_completion(&st->completion);
+
+ iodev->name = LPC32XXAD_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 = devm_iio_device_register(&pdev->dev, iodev);
+ if (retval)
+ return retval;
+
+ dev_info(&pdev->dev, "LPC32XX ADC driver loaded, IRQ %d\n", irq);
+
+ return 0;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id lpc32xx_adc_match[] = {
+ { .compatible = "nxp,lpc3220-adc" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, lpc32xx_adc_match);
+#endif
+
+static struct platform_driver lpc32xx_adc_driver = {
+ .probe = lpc32xx_adc_probe,
+ .driver = {
+ .name = LPC32XXAD_NAME,
+ .of_match_table = of_match_ptr(lpc32xx_adc_match),
+ },
+};
+
+module_platform_driver(lpc32xx_adc_driver);
+
+MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
+MODULE_DESCRIPTION("LPC32XX ADC driver");
+MODULE_LICENSE("GPL");
To compile this driver as a module, choose M here: the
module will be called ad7280a
-config LPC32XX_ADC
- tristate "NXP LPC32XX ADC"
- depends on ARCH_LPC32XX || COMPILE_TEST
- depends on HAS_IOMEM
- 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 should either select only one of the two
- drivers (lpc32xx_adc or lpc32xx_ts) or, in the OpenFirmware case,
- activate only one via device tree selection. Provides direct access
- via sysfs.
-
endmenu
obj-$(CONFIG_AD7816) += ad7816.o
obj-$(CONFIG_AD7192) += ad7192.o
obj-$(CONFIG_AD7280) += ad7280a.o
-obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
+++ /dev/null
-/*
- * 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 <linux/of.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-
-/*
- * LPC32XX registers definitions
- */
-#define LPC32XXAD_SELECT(x) ((x) + 0x04)
-#define LPC32XXAD_CTRL(x) ((x) + 0x08)
-#define LPC32XXAD_VALUE(x) ((x) + 0x48)
-
-/* Bit definitions for LPC32XXAD_SELECT: */
-/* constant, always write this value! */
-#define LPC32XXAD_REFm 0x00000200
-/* constant, always write this value! */
-#define LPC32XXAD_REFp 0x00000080
- /* multiple of this is the channel number: 0, 1, 2 */
-#define LPC32XXAD_IN 0x00000010
-/* constant, always write this value! */
-#define LPC32XXAD_INTERNAL 0x00000004
-
-/* Bit definitions for LPC32XXAD_CTRL: */
-#define LPC32XXAD_STROBE 0x00000002
-#define LPC32XXAD_PDN_CTRL 0x00000004
-
-/* Bit definitions for LPC32XXAD_VALUE: */
-#define LPC32XXAD_VALUE_MASK 0x000003FF
-
-#define LPC32XXAD_NAME "lpc32xx-adc"
-
-struct lpc32xx_adc_state {
- 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_state *st = iio_priv(indio_dev);
-
- if (mask == IIO_CHAN_INFO_RAW) {
- mutex_lock(&indio_dev->mlock);
- clk_prepare_enable(st->clk);
- /* Measurement setup */
- __raw_writel(LPC32XXAD_INTERNAL | (chan->address) |
- LPC32XXAD_REFp | LPC32XXAD_REFm,
- LPC32XXAD_SELECT(st->adc_base));
- /* Trigger conversion */
- __raw_writel(LPC32XXAD_PDN_CTRL | LPC32XXAD_STROBE,
- LPC32XXAD_CTRL(st->adc_base));
- wait_for_completion(&st->completion); /* set by ISR */
- clk_disable_unprepare(st->clk);
- *val = st->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, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .address = LPC32XXAD_IN * _index, \
- .scan_index = _index, \
-}
-
-static const 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_state *st = dev_id;
-
- /* Read value and clear irq */
- st->value = __raw_readl(LPC32XXAD_VALUE(st->adc_base)) &
- LPC32XXAD_VALUE_MASK;
- complete(&st->completion);
-
- return IRQ_HANDLED;
-}
-
-static int lpc32xx_adc_probe(struct platform_device *pdev)
-{
- struct lpc32xx_adc_state *st = 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");
- return -ENXIO;
- }
-
- iodev = devm_iio_device_alloc(&pdev->dev, sizeof(*st));
- if (!iodev)
- return -ENOMEM;
-
- st = iio_priv(iodev);
-
- st->adc_base = devm_ioremap(&pdev->dev, res->start,
- resource_size(res));
- if (!st->adc_base) {
- dev_err(&pdev->dev, "failed mapping memory\n");
- return -EBUSY;
- }
-
- st->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(st->clk)) {
- dev_err(&pdev->dev, "failed getting clock\n");
- return PTR_ERR(st->clk);
- }
-
- irq = platform_get_irq(pdev, 0);
- if (irq <= 0) {
- dev_err(&pdev->dev, "failed getting interrupt resource\n");
- return -ENXIO;
- }
-
- retval = devm_request_irq(&pdev->dev, irq, lpc32xx_adc_isr, 0,
- LPC32XXAD_NAME, st);
- if (retval < 0) {
- dev_err(&pdev->dev, "failed requesting interrupt\n");
- return retval;
- }
-
- platform_set_drvdata(pdev, iodev);
-
- init_completion(&st->completion);
-
- iodev->name = LPC32XXAD_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 = devm_iio_device_register(&pdev->dev, iodev);
- if (retval)
- return retval;
-
- dev_info(&pdev->dev, "LPC32XX ADC driver loaded, IRQ %d\n", irq);
-
- return 0;
-}
-
-#ifdef CONFIG_OF
-static const struct of_device_id lpc32xx_adc_match[] = {
- { .compatible = "nxp,lpc3220-adc" },
- {},
-};
-MODULE_DEVICE_TABLE(of, lpc32xx_adc_match);
-#endif
-
-static struct platform_driver lpc32xx_adc_driver = {
- .probe = lpc32xx_adc_probe,
- .driver = {
- .name = LPC32XXAD_NAME,
- .of_match_table = of_match_ptr(lpc32xx_adc_match),
- },
-};
-
-module_platform_driver(lpc32xx_adc_driver);
-
-MODULE_AUTHOR("Roland Stigge <stigge@antcom.de>");
-MODULE_DESCRIPTION("LPC32XX ADC driver");
-MODULE_LICENSE("GPL");
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