Re: iio: adc: add exynos5 adc driver under iio framwork

From: Lars-Peter Clausen
Date: Wed Feb 13 2013 - 08:29:24 EST

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In reply to: Naveen Krishna Ch: "Re: iio: adc: add exynos5 adc driver under iio framwork"
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On 02/13/2013 02:16 PM, Naveen Krishna Ch wrote:
> Please ignore the unfinished previous mail.
>
>
>
> On 13 February 2013 08:18, Naveen Krishna Ch <naveenkrishna.ch@xxxxxxxxx> wrote:
>> On 13 February 2013 02:37, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:
>>> On Wed, Jan 23, 2013 at 04:58:06AM -0000, Naveen Krishna Chatradhi wrote:
>>>> This patch add an ADC IP found on EXYNOS5 series socs from Samsung.
>>>> Also adds the Documentation for device tree bindings.
>>>>
>>>> Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
>>>>
>>>> ---
>>>> Changes since v1:
>>>>
>>>> 1. Fixed comments from Lars
>>>> 2. Added support for ADC on EXYNOS5410
>>>>
>>>> Changes since v2:
>>>>
>>>> 1. Changed the instance name for (struct iio_dev *) to indio_dev
>>>> 2. Changed devm_request_irq to request_irq
>>>>
>>>> Few doubts regarding the mappings and child device handling.
>>>> Kindly, suggest me better methods.
>>>>
>>>> .../bindings/arm/samsung/exynos5-adc.txt | 37 ++
>>>> drivers/iio/adc/Kconfig | 7 +
>>>> drivers/iio/adc/Makefile | 1 +
>>>> drivers/iio/adc/exynos5_adc.c | 464 ++++++++++++++++++++
>>>> 4 files changed, 509 insertions(+)
>>>> create mode 100644 Documentation/devicetree/bindings/arm/samsung/exynos5-adc.txt
>>>> create mode 100644 drivers/iio/adc/exynos5_adc.c
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/arm/samsung/exynos5-adc.txt b/Documentation/devicetree/bindings/arm/samsung/exynos5-adc.txt
>>>> new file mode 100644
>>>> index 0000000..9a5b515
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/arm/samsung/exynos5-adc.txt
>>>> @@ -0,0 +1,37 @@
>>>> +Samsung Exynos5 Analog to Digital Converter bindings
>>>> +
>>>> +Required properties:
>>>> +- compatible: Must be "samsung,exynos5250-adc" for exynos5250 controllers.
>>>> +- reg: Contains ADC register address range (base address and
>>>> + length).
>>>> +- interrupts: Contains the interrupt information for the timer. The
>>>> + format is being dependent on which interrupt controller
>>>> + the Samsung device uses.
>>>> +
>>>> +Note: child nodes can be added for auto probing from device tree.
>>>> +
>>>> +Example: adding device info in dtsi file
>>>> +
>>>> +adc@12D10000 {
>>>> + compatible = "samsung,exynos5250-adc";
>>>> + reg = <0x12D10000 0x100>;
>>>> + interrupts = <0 106 0>;
>>>> + #address-cells = <1>;
>>>> + #size-cells = <1>;
>>>> + ranges;
>>>> +};
>>>> +
>>>> +
>>>> +Example: Adding child nodes in dts file
>>>> +
>>>> +adc@12D10000 {
>>>> +
>>>> + /* NTC thermistor is a hwmon device */
>>>> + ncp15wb473@0 {
>>>> + compatible = "ntc,ncp15wb473";
>>>> + reg = <0x0>;
>>>> + pullup-uV = <1800000>;
>>>> + pullup-ohm = <47000>;
>>>> + pulldown-ohm = <0>;
>>>> + };
>>>> +};
>>>
>>> How about:
>>>
>>> adc: adc@12D10000 {
>>> compatible = "samsung,exynos5250-adc";
>>> reg = <0x12D10000 0x100>;
>>> interrupts = <0 106 0>;
>>> #io-channel-cells = <1>;
>>> };
>>>
>>> ...
>>>
>>> ncp15wb473@0 {
>>> compatible = "ntc,ncp15wb473";
>>> reg = <0x0>; /* is this needed ? */
>>> io-channels = <&adc 0>;
>>> io-channel-names = "adc";
>>> pullup-uV = <1800000>; /* uV or uv ? */
>>> pullup-ohm = <47000>;
>>> pulldown-ohm = <0>;
>>> };
>>>
>>> The ncp15wb473 driver would then use either iio_channel_get_all() to get the iio
>>> channel list or, if it only supports one adc channel per instance, iio_channel_get().
>>>
>>> In that context, it would probably make sense to rework the ntc_thermistor
>>> driver to support both DT as well as direct instantiation using access functions
>>> and platform data (as it does today).
>>>
>>> Also see https://patchwork.kernel.org/patch/2112171/.
>
> Hello Guenter,
>
> I've rebase my adc driver on top of your (OF for IIO patch)
>
> My setup is like the below one. kindly, help me find the right device
> tree node params
>
> One ADC controller with 8 channels,
> 4 NTC thermistors are connected to channel 3, 4, 5 and 6 of ADC respectively
>
> ADC ch - 0
> ADC ch - 1
> ADC ch - 2
> ADC ch - 3 ------------------NTC
> ADC ch - 4 ------------------NTC
> ADC ch - 5 ------------------NTC
> ADC ch - 6 ------------------NTC
> ADC ch - 7
>
> I've started off with something like this.
>
> adc0: adc@12D10000 {
> compatible = "samsung,exynos5250-adc";
> reg = <0x12D10000 0x100>;
> interrupts = <0 106 0>;
> #io-channel-cells = <1>;
> };
>
> adc0: adc@12D10000 {

This is a copy paste error, right? you only have one dt node for the adc?

> vdd-supply = <&buck5_reg>;
>
> ncp15wb473@0 {
> compatible = "ntc,ncp15wb473";
> io-channels = <&adc0 3>;
> io-channel-names = "adc3";
> pullup-uV = <1800000>;
> pullup-ohm = <47000>;
> pulldown-ohm = <0>;
> id = <3>;
> };
>
> ncp15wb473@1 {
> compatible = "ntc,ncp15wb473";
> pullup-uV = <1800000>;
> pullup-ohm = <47000>;
> pulldown-ohm = <0>;
> io-channels = <&adc0 4>;
> io-channel-names = "adc4";
> id = <4>;
> };
> ncp15wb473@2 {
> compatible = "ntc,ncp15wb473";
> pullup-uV = <1800000>;
> pullup-ohm = <47000>;
> pulldown-ohm = <0>;
> io-channels = <&adc0 5>;
> io-channel-names = "adc5";
> id = <5>;
> };
> ncp15wb473@3 {
> compatible = "ntc,ncp15wb473";
> pullup-uV = <1800000>;
> pullup-ohm = <47000>;
> pulldown-ohm = <0>;
> io-channels = <&adc0 6>;
> io-channel-names = "adc6";
> id = <6>;
> };
> };
>
> ADC driver will use of_platform_populate() to populate the child nodes
> (ntc thermistors in my case)
>
> I've modified the NTC driver to support DT. in probe
> chan = iio_channel_get(&pdev->dev, "adcX");
> and using "id" field to use respective ADC channel to do the raw_read()

The beauty of the interface is that the consumer doesn't need to know the
number of the channel it is using. This is already fully described in the
io-channels property. Since you only have one channel per consumer just use

iio_chanel_get(&pdev->dev, NULL)

>
> Issue:
> 1. I get weird device names for thermistors starting from ncp15wb473.2
> to ncp15wb473.5
> 2. ADC doesn't looks like creating valid channels
>
> Any clues please
>
>>>
>>> Thanks,
>>> Guenter
>> Yes Guenter, I will rebase and submit the ADC driver based on your patch set.
>>>
>>>> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
>>>> index fe822a1..33ceabf 100644
>>>> --- a/drivers/iio/adc/Kconfig
>>>> +++ b/drivers/iio/adc/Kconfig
>>>> @@ -91,6 +91,13 @@ config AT91_ADC
>>>> help
>>>> Say yes here to build support for Atmel AT91 ADC.
>>>>
>>>> +config EXYNOS5_ADC
>>>> + bool "Exynos5 ADC driver support"
>>>> + help
>>>> + Core support for the ADC block found in the Samsung EXYNOS5 series
>>>> + of SoCs for drivers such as the touchscreen and hwmon to use to share
>>>> + this resource.
>>>> +
>>>> config LP8788_ADC
>>>> bool "LP8788 ADC driver"
>>>> depends on MFD_LP8788
>>>> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
>>>> index 2d5f100..5b4a4f6 100644
>>>> --- a/drivers/iio/adc/Makefile
>>>> +++ b/drivers/iio/adc/Makefile
>>>> @@ -10,6 +10,7 @@ obj-$(CONFIG_AD7791) += ad7791.o
>>>> obj-$(CONFIG_AD7793) += ad7793.o
>>>> obj-$(CONFIG_AD7887) += ad7887.o
>>>> obj-$(CONFIG_AT91_ADC) += at91_adc.o
>>>> +obj-$(CONFIG_EXYNOS5_ADC) += exynos5_adc.o
>>>> obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
>>>> obj-$(CONFIG_MAX1363) += max1363.o
>>>> obj-$(CONFIG_TI_ADC081C) += ti-adc081c.o
>>>> diff --git a/drivers/iio/adc/exynos5_adc.c b/drivers/iio/adc/exynos5_adc.c
>>>> new file mode 100644
>>>> index 0000000..8982675
>>>> --- /dev/null
>>>> +++ b/drivers/iio/adc/exynos5_adc.c
>>>> @@ -0,0 +1,464 @@
>>>> +/*
>>>> + * exynos5_adc.c - Support for ADC in EXYNOS5 SoCs
>>>> + *
>>>> + * 8 ~ 10 channel, 10/12-bit ADC
>>>> + *
>>>> + * Copyright (C) 2013 Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>
>>>> + *
>>>> + * 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/delay.h>
>>>> +#include <linux/kernel.h>
>>>> +#include <linux/slab.h>
>>>> +#include <linux/io.h>
>>>> +#include <linux/clk.h>
>>>> +#include <linux/completion.h>
>>>> +#include <linux/of.h>
>>>> +#include <linux/of_irq.h>
>>>> +#include <linux/regulator/consumer.h>
>>>> +#include <linux/of_platform.h>
>>>> +
>>>> +#include <linux/iio/iio.h>
>>>> +#include <linux/iio/machine.h>
>>>> +#include <linux/iio/driver.h>
>>>> +
>>>> +enum adc_version {
>>>> + ADC_V1,
>>>> + ADC_V2
>>>> +};
>>>> +
>>>> +/* EXYNOS5250 ADC_V1 registers definitions */
>>>> +#define ADC_V1_CON(x) ((x) + 0x00)
>>>> +#define ADC_V1_DLY(x) ((x) + 0x08)
>>>> +#define ADC_V1_DATX(x) ((x) + 0x0C)
>>>> +#define ADC_V1_INTCLR(x) ((x) + 0x18)
>>>> +#define ADC_V1_MUX(x) ((x) + 0x1c)
>>>> +
>>>> +/* EXYNOS5410 ADC_V2 registers definitions */
>>>> +#define ADC_V2_CON1(x) ((x) + 0x00)
>>>> +#define ADC_V2_CON2(x) ((x) + 0x04)
>>>> +#define ADC_V2_STAT(x) ((x) + 0x08)
>>>> +#define ADC_V2_INT_EN(x) ((x) + 0x10)
>>>> +#define ADC_V2_INT_ST(x) ((x) + 0x14)
>>>> +#define ADC_V2_VER(x) ((x) + 0x20)
>>>> +
>>>> +/* Bit definitions for ADC_V1 */
>>>> +#define ADC_V1_CON_RES (1u << 16)
>>>> +#define ADC_V1_CON_PRSCEN (1u << 14)
>>>> +#define ADC_V1_CON_PRSCLV(x) (((x) & 0xFF) << 6)
>>>> +#define ADC_V1_CON_STANDBY (1u << 2)
>>>> +
>>>> +/* Bit definitions for ADC_V2 */
>>>> +#define ADC_V2_CON1_SOFT_RESET (1u << 2)
>>>> +
>>>> +#define ADC_V2_CON2_OSEL (1u << 10)
>>>> +#define ADC_V2_CON2_ESEL (1u << 9)
>>>> +#define ADC_V2_CON2_HIGHF (1u << 8)
>>>> +#define ADC_V2_CON2_C_TIME(x) (((x) & 7) << 4)
>>>> +#define ADC_V2_CON2_ACH_SEL(x) (((x) & 0xF) << 0)
>>>> +#define ADC_V2_CON2_ACH_MASK 0xF
>>>> +
>>>> +/* Bit definitions common for ADC_V1 and ADC_V2 */
>>>> +#define ADC_V1_CON_EN_START (1u << 0)
>>>> +#define ADC_V1_DATX_MASK 0xFFF
>>>> +
>>>> +struct exynos5_adc {
>>>> + void __iomem *regs;
>>>> + struct clk *clk;
>>>> + unsigned int irq;
>>>> + struct regulator *vdd;
>>>> +
>>>> + struct completion completion;
>>>> +
>>>> + struct iio_map *map;
>>>> + u32 value;
>>>> + unsigned int version;
>>>> +};
>>>> +
>>>> +static const struct of_device_id exynos5_adc_match[] = {
>>>> + { .compatible = "samsung,exynos5250-adc", .data = (void *)ADC_V1 },
>>>> + { .compatible = "samsung,exynos5410-adc", .data = (void *)ADC_V2 },
>>>> + {},
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, exynos5_adc_match);
>>>> +
>>>> +static inline unsigned int exynos5_adc_get_version(struct platform_device *pdev)
>>>> +{
>>>> + const struct of_device_id *match;
>>>> +
>>>> + match = of_match_node(exynos5_adc_match, pdev->dev.of_node);
>>>> + return (unsigned int)match->data;
>>>> +}
>>>> +
>>>> +/* default maps used by iio consumer (ex: ntc-thermistor driver) */
>>>> +static struct iio_map exynos5_adc_iio_maps[] = {
>>>> + {
>>>> + .consumer_dev_name = "0.ncp15wb473",
>>>> + .consumer_channel = "adc3",
>>>> + .adc_channel_label = "adc3",
>>>> + },
>>>> + {
>>>> + .consumer_dev_name = "1.ncp15wb473",
>>>> + .consumer_channel = "adc4",
>>>> + .adc_channel_label = "adc4",
>>>> + },
>>>> + {
>>>> + .consumer_dev_name = "2.ncp15wb473",
>>>> + .consumer_channel = "adc5",
>>>> + .adc_channel_label = "adc5",
>>>> + },
>>>> + {
>>>> + .consumer_dev_name = "3.ncp15wb473",
>>>> + .consumer_channel = "adc6",
>>>> + .adc_channel_label = "adc6",
>>>> + },
>>>> + {},
>>>> +};
>>>> +
>>>> +static int exynos5_read_raw(struct iio_dev *indio_dev,
>>>> + struct iio_chan_spec const *chan,
>>>> + int *val,
>>>> + int *val2,
>>>> + long mask)
>>>> +{
>>>> + struct exynos5_adc *info = iio_priv(indio_dev);
>>>> + u32 con1, con2;
>>>> +
>>>> + if (mask == IIO_CHAN_INFO_RAW) {
>>>> + mutex_lock(&indio_dev->mlock);
>>>> +
>>>> + /* Select the channel to be used and Trigger conversion */
>>>> + if (info->version == ADC_V2) {
>>>> + con2 = readl(ADC_V2_CON2(info->regs));
>>>> + con2 &= ~ADC_V2_CON2_ACH_MASK;
>>>> + con2 |= ADC_V2_CON2_ACH_SEL(chan->address);
>>>> + writel(con2, ADC_V2_CON2(info->regs));
>>>> +
>>>> + con1 = readl(ADC_V2_CON1(info->regs));
>>>> + writel(con1 | ADC_V1_CON_EN_START,
>>>> + ADC_V2_CON1(info->regs));
>>>> + } else {
>>>> + writel(chan->address, ADC_V1_MUX(info->regs));
>>>> +
>>>> + con1 = readl(ADC_V1_CON(info->regs));
>>>> + writel(con1 | ADC_V1_CON_EN_START,
>>>> + ADC_V1_CON(info->regs));
>>>> + }
>>>> +
>>>> + wait_for_completion(&info->completion);
>>>> + *val = info->value;
>>>> +
>>>> + mutex_unlock(&indio_dev->mlock);
>>>> +
>>>> + return IIO_VAL_INT;
>>>> + }
>>>> +
>>>> + return -EINVAL;
>>>> +}
>>>> +
>>>> +static irqreturn_t exynos5_adc_isr(int irq, void *dev_id)
>>>> +{
>>>> + struct exynos5_adc *info = (struct exynos5_adc *)dev_id;
>>>> +
>>>> + /* Read value */
>>>> + info->value = readl(ADC_V1_DATX(info->regs)) &
>>>> + ADC_V1_DATX_MASK;
>>>> + /* clear irq */
>>>> + if (info->version == ADC_V2)
>>>> + writel(1, ADC_V2_INT_ST(info->regs));
>>>> + else
>>>> + writel(1, ADC_V1_INTCLR(info->regs));
>>>> +
>>>> + complete(&info->completion);
>>>> +
>>>> + return IRQ_HANDLED;
>>>> +}
>>>> +
>>>> +static int exynos5_adc_reg_access(struct iio_dev *indio_dev,
>>>> + unsigned reg, unsigned writeval,
>>>> + unsigned *readval)
>>>> +{
>>>> + struct exynos5_adc *info = iio_priv(indio_dev);
>>>> + u32 ret;
>>>> +
>>>> + mutex_lock(&indio_dev->mlock);
>>>> +
>>>> + if (readval != NULL) {
>>>> + ret = readl(info->regs + reg);
>>>> + *readval = ret;
>>>> + } else
>>>> + ret = -EINVAL;
>>>> +
>>>> + mutex_unlock(&indio_dev->mlock);
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static const struct iio_info exynos5_adc_iio_info = {
>>>> + .read_raw = &exynos5_read_raw,
>>>> + .debugfs_reg_access = &exynos5_adc_reg_access,
>>>> + .driver_module = THIS_MODULE,
>>>> +};
>>>> +
>>>> +#define ADC_V1_CHANNEL(_index, _id) { \
>>>> + .type = IIO_VOLTAGE, \
>>>> + .indexed = 1, \
>>>> + .channel = _index, \
>>>> + .address = _index, \
>>>> + .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT, \
>>>> + .datasheet_name = _id, \
>>>> +}
>>>> +
>>>> +/** ADC core in EXYNOS5410 has 10 channels,
>>>> + * ADC core in EXYNOS5250 has 8 channels
>>>> +*/
>>>> +static const struct iio_chan_spec exynos5_adc_iio_channels[] = {
>>>> + ADC_V1_CHANNEL(0, "adc0"),
>>>> + ADC_V1_CHANNEL(1, "adc1"),
>>>> + ADC_V1_CHANNEL(2, "adc2"),
>>>> + ADC_V1_CHANNEL(3, "adc3"),
>>>> + ADC_V1_CHANNEL(4, "adc4"),
>>>> + ADC_V1_CHANNEL(5, "adc5"),
>>>> + ADC_V1_CHANNEL(6, "adc6"),
>>>> + ADC_V1_CHANNEL(7, "adc7"),
>>>> + ADC_V1_CHANNEL(8, "adc8"),
>>>> + ADC_V1_CHANNEL(9, "adc9"),
>>>> +};
>>>> +
>>>> +static int exynos5_adc_remove_devices(struct device *dev, void *c)
>>>> +{
>>>> + struct platform_device *pdev = to_platform_device(dev);
>>>> +
>>>> + platform_device_unregister(pdev);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static void exynos5_adc_hw_init(struct exynos5_adc *info)
>>>> +{
>>>> + u32 con1, con2;
>>>> +
>>>> + if (info->version == ADC_V2) {
>>>> + con1 = ADC_V2_CON1_SOFT_RESET;
>>>> + writel(con1, ADC_V2_CON1(info->regs));
>>>> +
>>>> + con2 = ADC_V2_CON2_OSEL | ADC_V2_CON2_ESEL |
>>>> + ADC_V2_CON2_HIGHF | ADC_V2_CON2_C_TIME(0);
>>>> + writel(con2, ADC_V2_CON2(info->regs));
>>>> +
>>>> + /* Enable interrupts */
>>>> + writel(1, ADC_V2_INT_EN(info->regs));
>>>> + } else {
>>>> + /* set default prescaler values and Enable prescaler */
>>>> + con1 = ADC_V1_CON_PRSCLV(49) | ADC_V1_CON_PRSCEN;
>>>> +
>>>> + /* Enable 12-bit ADC resolution */
>>>> + con1 |= ADC_V1_CON_RES;
>>>> + writel(con1, ADC_V1_CON(info->regs));
>>>> + }
>>>> +}
>>>> +
>>>> +static int exynos5_adc_probe(struct platform_device *pdev)
>>>> +{
>>>> + struct exynos5_adc *info = NULL;
>>>> + struct device_node *np = pdev->dev.of_node;
>>>> + struct iio_dev *indio_dev = NULL;
>>>> + struct resource *mem;
>>>> + int ret = -ENODEV;
>>>> + int irq;
>>>> +
>>>> + if (!np)
>>>> + return ret;
>>>> +
>>>> + indio_dev = iio_device_alloc(sizeof(struct exynos5_adc));
>>>> + if (!indio_dev) {
>>>> + dev_err(&pdev->dev, "failed allocating iio device\n");
>>>> + return -ENOMEM;
>>>> + }
>>>> +
>>>> + info = iio_priv(indio_dev);
>>>> +
>>>> + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>>>> +
>>>> + info->regs = devm_request_and_ioremap(&pdev->dev, mem);
>>>> +
>>>> + irq = platform_get_irq(pdev, 0);
>>>> + if (irq < 0) {
>>>> + dev_err(&pdev->dev, "no irq resource?\n");
>>>> + ret = irq;
>>>> + goto err_iio;
>>>> + }
>>>> +
>>>> + info->irq = irq;
>>>> +
>>>> + ret = request_irq(info->irq, exynos5_adc_isr,
>>>> + 0, dev_name(&pdev->dev), info);
>>>> + if (ret < 0) {
>>>> + dev_err(&pdev->dev, "failed requesting irq, irq = %d\n",
>>>> + info->irq);
>>>> + goto err_iio;
>>>> + }
>>>> +
>>>> + info->clk = devm_clk_get(&pdev->dev, "adc");
>>>> + if (IS_ERR(info->clk)) {
>>>> + dev_err(&pdev->dev, "failed getting clock, err = %ld\n",
>>>> + PTR_ERR(info->clk));
>>>> + ret = PTR_ERR(info->clk);
>>>> + goto err_irq;
>>>> + }
>>>> +
>>>> + info->vdd = devm_regulator_get(&pdev->dev, "vdd");
>>>> + if (IS_ERR(info->vdd)) {
>>>> + dev_err(&pdev->dev, "failed getting regulator, err = %ld\n",
>>>> + PTR_ERR(info->vdd));
>>>> + ret = PTR_ERR(info->vdd);
>>>> + goto err_irq;
>>>> + }
>>>> +
>>>> + info->version = exynos5_adc_get_version(pdev);
>>>> +
>>>> + platform_set_drvdata(pdev, indio_dev);
>>>> +
>>>> + init_completion(&info->completion);
>>>> +
>>>> + indio_dev->name = dev_name(&pdev->dev);
>>>> + indio_dev->dev.parent = &pdev->dev;
>>>> + indio_dev->dev.of_node = pdev->dev.of_node;
>>>> + indio_dev->info = &exynos5_adc_iio_info;
>>>> + indio_dev->modes = INDIO_DIRECT_MODE;
>>>> + indio_dev->channels = exynos5_adc_iio_channels;
>>>> + indio_dev->num_channels = ARRAY_SIZE(exynos5_adc_iio_channels);
>>>> +
>>>> + info->map = exynos5_adc_iio_maps;
>>>> +
>>>> + ret = iio_map_array_register(indio_dev, info->map);
>>>> + if (ret) {
>>>> + dev_err(&indio_dev->dev, "failed mapping iio, err: %d\n", ret);
>>>> + goto err_irq;
>>>> + }
>>>> +
>>>> + ret = iio_device_register(indio_dev);
>>>> + if (ret)
>>>> + goto err_map;
>>>> +
>>>> + ret = regulator_enable(info->vdd);
>>>> + if (ret)
>>>> + goto err_iio_dev;
>>>> +
>>>> + clk_prepare_enable(info->clk);
>>>> +
>>>> + exynos5_adc_hw_init(info);
>>>> +
>>>> + ret = of_platform_populate(np, exynos5_adc_match, NULL, &pdev->dev);
>>>> + if (ret < 0) {
>>>> + dev_err(&pdev->dev, "failed adding child nodes\n");
>>>> + goto err_of_populate;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +
>>>> +err_of_populate:
>>>> + device_for_each_child(&pdev->dev, NULL, exynos5_adc_remove_devices);
>>>> +err_iio_dev:
>>>> + iio_device_unregister(indio_dev);
>>>> +err_map:
>>>> + iio_map_array_unregister(indio_dev, info->map);
>>>> +err_irq:
>>>> + free_irq(info->irq, info);
>>>> +err_iio:
>>>> + iio_device_free(indio_dev);
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static int exynos5_adc_remove(struct platform_device *pdev)
>>>> +{
>>>> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
>>>> + struct exynos5_adc *info = iio_priv(indio_dev);
>>>> +
>>>> + iio_device_unregister(indio_dev);
>>>> + iio_map_array_unregister(indio_dev, info->map);
>>>> + free_irq(info->irq, info);
>>>> + iio_device_free(indio_dev);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +#ifdef CONFIG_PM_SLEEP
>>>> +static int exynos5_adc_suspend(struct device *dev)
>>>> +{
>>>> + struct exynos5_adc *info = dev_get_data(dev);
>>>> + u32 con;
>>>> +
>>>> + if (info->version == ADC_V2) {
>>>> + con = readl(ADC_V2_CON1(info->regs));
>>>> + con &= ~ADC_V1_CON_EN_START;
>>>> + writel(con, ADC_V2_CON1(info->regs));
>>>> + } else {
>>>> + con = readl(ADC_V1_CON(info->regs));
>>>> + con |= ADC_V1_CON_STANDBY;
>>>> + writel(con, ADC_V1_CON(info->regs));
>>>> + }
>>>> +
>>>> + clk_unprepare_disable(info->clk);
>>>> + regulator_disable(info->vdd);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int exynos5_adc_resume(struct device *dev)
>>>> +{
>>>> + struct exynos5_adc *info = dev_get_data(dev);
>>>> + int ret;
>>>> +
>>>> + ret = regulator_enable(info->vdd);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + clk_prepare_enable(info->clk);
>>>> +
>>>> + exynos5_adc_hw_init(info);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +#else
>>>> +#define exynos5_adc_suspend NULL
>>>> +#define exynos5_adc_resume NULL
>>>> +#endif
>>>> +
>>>> +static SIMPLE_DEV_PM_OPS(exynos5_adc_pm_ops,
>>>> + exynos5_adc_suspend,
>>>> + exynos5_adc_resume);
>>>> +
>>>> +static struct platform_driver exynos5_adc_driver = {
>>>> + .probe = exynos5_adc_probe,
>>>> + .remove = exynos5_adc_remove,
>>>> + .driver = {
>>>> + .name = "exynos5-adc",
>>>> + .owner = THIS_MODULE,
>>>> + .of_match_table = of_match_ptr(exynos5_adc_match),
>>>> + .pm = &exynos5_adc_pm_ops,
>>>> + },
>>>> +};
>>>> +
>>>> +module_platform_driver(exynos5_adc_driver);
>>>> +
>>>> +MODULE_AUTHOR("Naveen Krishna Chatradhi <ch.naveen@xxxxxxxxxxx>");
>>>> +MODULE_DESCRIPTION("Samsung EXYNOS5 ADC driver");
>>>> +MODULE_LICENSE("GPL");
>>
>>
>>
>> --
>> Shine bright,
>> (: Nav :)
>
>
>
> --
> Shine bright,
> (: Nav :)
> --
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