diff options
Diffstat (limited to 'drivers/staging/iio/adc/lpc32xx_adc.c')
| -rw-r--r-- | drivers/staging/iio/adc/lpc32xx_adc.c | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/drivers/staging/iio/adc/lpc32xx_adc.c b/drivers/staging/iio/adc/lpc32xx_adc.c deleted file mode 100644 index b51f237..0000000 --- a/drivers/staging/iio/adc/lpc32xx_adc.c +++ /dev/null @@ -1,215 +0,0 @@ -/* - * 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 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 == IIO_CHAN_INFO_RAW) { - mutex_lock(&indio_dev->mlock); - clk_prepare_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_unprepare(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, \ - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ - .address = AD_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_info *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 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"); - return -ENXIO; - } - - iodev = devm_iio_device_alloc(&pdev->dev, sizeof(*info)); - if (!iodev) - return -ENOMEM; - - info = iio_priv(iodev); - - info->adc_base = devm_ioremap(&pdev->dev, res->start, - resource_size(res)); - if (!info->adc_base) { - dev_err(&pdev->dev, "failed mapping memory\n"); - return -EBUSY; - } - - info->clk = devm_clk_get(&pdev->dev, NULL); - if (IS_ERR(info->clk)) { - dev_err(&pdev->dev, "failed getting clock\n"); - return PTR_ERR(info->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, - MOD_NAME, info); - if (retval < 0) { - dev_err(&pdev->dev, "failed requesting interrupt\n"); - return retval; - } - - 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 = 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 = MOD_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"); |
