Message-ID: <20200720124904.7fe056b2@archlinux>
Date:   Mon, 20 Jul 2020 12:49:04 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Artur Rojek <contact@...ur-rojek.eu>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 6/6] IIO: Ingenic JZ47xx: Add touchscreen mode.

On Sun, 12 Jul 2020 22:16:04 +0200
Paul Cercueil <paul@...pouillou.net> wrote:

> Hi Jonathan,
> 
> Le dim. 12 juil. 2020 à 14:19, Jonathan Cameron <jic23@...nel.org> a 
> écrit :
> > On Thu,  9 Jul 2020 17:22:00 +0200
> > Artur Rojek <contact@...ur-rojek.eu> wrote:
> >   
> >>  The SADC component in JZ47xx SoCs provides support for touchscreen
> >>  operations (pen position and pen down pressure) in single-ended and
> >>  differential modes.
> >> 
> >>  The touchscreen component of SADC takes a significant time to 
> >> stabilize
> >>  after first receiving the clock and a delay of 50ms has been 
> >> empirically
> >>  proven to be a safe value before data sampling can begin.
> >> 
> >>  Of the known hardware to use this controller, GCW Zero and Anbernic 
> >> RG-350
> >>  utilize the touchscreen mode by having their joystick(s) attached 
> >> to the
> >>  X/Y positive/negative input pins.
> >> 
> >>  JZ4770 and later SoCs introduce a low-level command feature. With 
> >> it, up
> >>  to 32 commands can be programmed, each one corresponding to a 
> >> sampling
> >>  job. It allows to change the low-voltage reference, the high-voltage
> >>  reference, have them connected to VCC, GND, or one of the X-/X+ or 
> >> Y-/Y+
> >>  pins.
> >> 
> >>  This patch introduces support for 6 stream-capable channels:
> >>  - channel #0 samples X+/GND
> >>  - channel #1 samples Y+/GND
> >>  - channel #2 samples X-/GND
> >>  - channel #3 samples Y-/GND
> >>  - channel #4 samples X+/X-
> >>  - channel #5 samples Y+/Y-  
> > 
> > The one thing I noticed on this read was that we are slightly 
> > stretching
> > the normal IIO channel definitions.  The claim is that each of these 
> > channels
> > is a POSITIONREALTIVE channel, whereas that isn't really true.  They 
> > are
> > related to the position, but as I understand it not directly 
> > measuring it
> > (particularly X+ - X-) which is pretty much a reference voltage (I 
> > think!)
> > 
> > We might be better off just describing these as voltage channels, with
> > 4 and 5 described as differential voltage channels.  The problem there
> > being that it doesn't describe the fact that the measurements are with
> > particular voltages also being applied to the touch screen.
> > 
> > Perhaps we are best off just leaving it as you have it and being a bit
> > 'odd'.  What do you think?  Having written this down I think perhaps 
> > leaving
> > it alone is the best plan :(  
> 
> That's up to you really. These ADC channels will measure voltage, but 
> they are supposed to be used with a touchscreen, that's why we went 
> with POSITIONRELATIVE. However, with the kind of devices we're working 
> with, they are never used as such, so using VOLTAGE would work too.
I've picked up v9 as I don't think this matters hugely one way or the other.
If it becomes an issue in the long run I'm not that bothered if we end up
with one driver with a legacy and a new interface.

Thanks,

Jonathan

> 
> > Otherwise this all looks fine to me.
> > 
> > Thanks,
> > 
> > Jonathan
> >   
> >> 
> >>  Being able to sample X-/GND and Y-/GND is useful on some devices, 
> >> where
> >>  one joystick is connected to the X+/Y+ pins, and a second joystick 
> >> is
> >>  connected to the X-/Y- pins.
> >> 
> >>  All the boards which probe this driver have the interrupt provided 
> >> from
> >>  Device Tree, with no need to handle a case where the IRQ was not 
> >> provided.
> >> 
> >>  Co-developed-by: Paul Cercueil <paul@...pouillou.net>
> >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> >>  Signed-off-by: Artur Rojek <contact@...ur-rojek.eu>
> >>  ---
> >> 
> >>   Changes:
> >> 
> >>   v2: - improve description of the touchscreen mode,
> >>       - get rid of the unneeded kfifo,
> >>       - drop IIO_BUFFER_CB from Kconfig,
> >>       - remove extended names from the touchscreen channels
> >> 
> >>   v3: remove unneeded `linux/iio/kfifo_buf.h` include
> >> 
> >>   v4: clarify irq provider source in the patch description
> >> 
> >>   v5: no change
> >> 
> >>   v6: - correct the spelling of Device Tree and IRQ in commit message
> >>       - don't omit trailing commas from initializer lists
> >>       - error check `clk_enable`
> >>       - remove redundant `dev_err` from `platform_get_irq` error 
> >> check
> >> 
> >>   v7: no change
> >> 
> >>   v8: add support for ADCMD low-level command feature
> >> 
> >>   drivers/iio/adc/Kconfig       |   1 +
> >>   drivers/iio/adc/ingenic-adc.c | 250 
> >> +++++++++++++++++++++++++++++++++-
> >>   2 files changed, 249 insertions(+), 2 deletions(-)
> >> 
> >>  diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> >>  index ff3569635ce0..5b57437cef75 100644
> >>  --- a/drivers/iio/adc/Kconfig
> >>  +++ b/drivers/iio/adc/Kconfig
> >>  @@ -500,6 +500,7 @@ config INA2XX_ADC
> >>   config INGENIC_ADC
> >>   	tristate "Ingenic JZ47xx SoCs ADC driver"
> >>   	depends on MIPS || COMPILE_TEST
> >>  +	select IIO_BUFFER
> >>   	help
> >>   	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC 
> >> unit.
> >> 
> >>  diff --git a/drivers/iio/adc/ingenic-adc.c 
> >> b/drivers/iio/adc/ingenic-adc.c
> >>  index 0233a9055c86..976aea46fede 100644
> >>  --- a/drivers/iio/adc/ingenic-adc.c
> >>  +++ b/drivers/iio/adc/ingenic-adc.c
> >>  @@ -8,7 +8,9 @@
> >> 
> >>   #include <dt-bindings/iio/adc/ingenic,adc.h>
> >>   #include <linux/clk.h>
> >>  +#include <linux/iio/buffer.h>
> >>   #include <linux/iio/iio.h>
> >>  +#include <linux/interrupt.h>
> >>   #include <linux/io.h>
> >>   #include <linux/iopoll.h>
> >>   #include <linux/kernel.h>
> >>  @@ -20,19 +22,46 @@
> >>   #define JZ_ADC_REG_CFG			0x04
> >>   #define JZ_ADC_REG_CTRL			0x08
> >>   #define JZ_ADC_REG_STATUS		0x0c
> >>  +#define JZ_ADC_REG_ADSAME		0x10
> >>  +#define JZ_ADC_REG_ADWAIT		0x14
> >>   #define JZ_ADC_REG_ADTCH		0x18
> >>   #define JZ_ADC_REG_ADBDAT		0x1c
> >>   #define JZ_ADC_REG_ADSDAT		0x20
> >>  +#define JZ_ADC_REG_ADCMD		0x24
> >>   #define JZ_ADC_REG_ADCLK		0x28
> >> 
> >>   #define JZ_ADC_REG_ENABLE_PD		BIT(7)
> >>   #define JZ_ADC_REG_CFG_AUX_MD		(BIT(0) | BIT(1))
> >>   #define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
> >>  +#define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
> >>  +#define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
> >>  +#define JZ_ADC_REG_CFG_CMD_SEL		BIT(22)
> >>  +#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
> >>   #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
> >>   #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
> >>   #define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB	8
> >>   #define JZ4770_ADC_REG_ADCLK_CLKDIVMS_LSB	16
> >> 
> >>  +#define JZ_ADC_REG_ADCMD_YNADC		BIT(7)
> >>  +#define JZ_ADC_REG_ADCMD_YPADC		BIT(8)
> >>  +#define JZ_ADC_REG_ADCMD_XNADC		BIT(9)
> >>  +#define JZ_ADC_REG_ADCMD_XPADC		BIT(10)
> >>  +#define JZ_ADC_REG_ADCMD_VREFPYP	BIT(11)
> >>  +#define JZ_ADC_REG_ADCMD_VREFPXP	BIT(12)
> >>  +#define JZ_ADC_REG_ADCMD_VREFPXN	BIT(13)
> >>  +#define JZ_ADC_REG_ADCMD_VREFPAUX	BIT(14)
> >>  +#define JZ_ADC_REG_ADCMD_VREFPVDD33	BIT(15)
> >>  +#define JZ_ADC_REG_ADCMD_VREFNYN	BIT(16)
> >>  +#define JZ_ADC_REG_ADCMD_VREFNXP	BIT(17)
> >>  +#define JZ_ADC_REG_ADCMD_VREFNXN	BIT(18)
> >>  +#define JZ_ADC_REG_ADCMD_VREFAUX	BIT(19)
> >>  +#define JZ_ADC_REG_ADCMD_YNGRU		BIT(20)
> >>  +#define JZ_ADC_REG_ADCMD_XNGRU		BIT(21)
> >>  +#define JZ_ADC_REG_ADCMD_XPGRU		BIT(22)
> >>  +#define JZ_ADC_REG_ADCMD_YPSUP		BIT(23)
> >>  +#define JZ_ADC_REG_ADCMD_XNSUP		BIT(24)
> >>  +#define JZ_ADC_REG_ADCMD_XPSUP		BIT(25)
> >>  +
> >>   #define JZ_ADC_AUX_VREF				3300
> >>   #define JZ_ADC_AUX_VREF_BITS			12
> >>   #define JZ_ADC_BATTERY_LOW_VREF			2500
> >>  @@ -44,6 +73,14 @@
> >>   #define JZ4770_ADC_BATTERY_VREF			6600
> >>   #define JZ4770_ADC_BATTERY_VREF_BITS		12
> >> 
> >>  +#define JZ_ADC_IRQ_AUX			BIT(0)
> >>  +#define JZ_ADC_IRQ_BATTERY		BIT(1)
> >>  +#define JZ_ADC_IRQ_TOUCH		BIT(2)
> >>  +#define JZ_ADC_IRQ_PEN_DOWN		BIT(3)
> >>  +#define JZ_ADC_IRQ_PEN_UP		BIT(4)
> >>  +#define JZ_ADC_IRQ_PEN_DOWN_SLEEP	BIT(5)
> >>  +#define JZ_ADC_IRQ_SLEEP		BIT(7)
> >>  +
> >>   struct ingenic_adc;
> >> 
> >>   struct ingenic_adc_soc_data {
> >>  @@ -69,6 +106,61 @@ struct ingenic_adc {
> >>   	bool low_vref_mode;
> >>   };
> >> 
> >>  +static void ingenic_adc_set_adcmd(struct iio_dev *iio_dev, 
> >> unsigned long mask)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +
> >>  +	mutex_lock(&adc->lock);
> >>  +
> >>  +	/* Init ADCMD */
> >>  +	readl(adc->base + JZ_ADC_REG_ADCMD);
> >>  +
> >>  +	if (mask & 0x3) {
> >>  +		/* Second channel (INGENIC_ADC_TOUCH_YP): sample YP vs. GND */
> >>  +		writel(JZ_ADC_REG_ADCMD_XNGRU
> >>  +		       | JZ_ADC_REG_ADCMD_VREFNXN | JZ_ADC_REG_ADCMD_VREFPVDD33
> >>  +		       | JZ_ADC_REG_ADCMD_YPADC,
> >>  +		       adc->base + JZ_ADC_REG_ADCMD);
> >>  +
> >>  +		/* First channel (INGENIC_ADC_TOUCH_XP): sample XP vs. GND */
> >>  +		writel(JZ_ADC_REG_ADCMD_YNGRU
> >>  +		       | JZ_ADC_REG_ADCMD_VREFNYN | JZ_ADC_REG_ADCMD_VREFPVDD33
> >>  +		       | JZ_ADC_REG_ADCMD_XPADC,
> >>  +		       adc->base + JZ_ADC_REG_ADCMD);
> >>  +	}
> >>  +
> >>  +	if (mask & 0xc) {
> >>  +		/* Fourth channel (INGENIC_ADC_TOUCH_YN): sample YN vs. GND */
> >>  +		writel(JZ_ADC_REG_ADCMD_XNGRU
> >>  +		       | JZ_ADC_REG_ADCMD_VREFNXN | JZ_ADC_REG_ADCMD_VREFPVDD33
> >>  +		       | JZ_ADC_REG_ADCMD_YNADC,
> >>  +		       adc->base + JZ_ADC_REG_ADCMD);
> >>  +
> >>  +		/* Third channel (INGENIC_ADC_TOUCH_XN): sample XN vs. GND */
> >>  +		writel(JZ_ADC_REG_ADCMD_YNGRU
> >>  +		       | JZ_ADC_REG_ADCMD_VREFNYN | JZ_ADC_REG_ADCMD_VREFPVDD33
> >>  +		       | JZ_ADC_REG_ADCMD_XNADC,
> >>  +		       adc->base + JZ_ADC_REG_ADCMD);
> >>  +	}
> >>  +
> >>  +	if (mask & 0x30) {
> >>  +		/* Sixth channel (INGENIC_ADC_TOUCH_YD): sample YP vs. YN */
> >>  +		writel(JZ_ADC_REG_ADCMD_VREFNYN | JZ_ADC_REG_ADCMD_VREFPVDD33
> >>  +		       | JZ_ADC_REG_ADCMD_YPADC,
> >>  +		       adc->base + JZ_ADC_REG_ADCMD);
> >>  +
> >>  +		/* Fifth channel (INGENIC_ADC_TOUCH_XD): sample XP vs. XN */
> >>  +		writel(JZ_ADC_REG_ADCMD_VREFNXN | JZ_ADC_REG_ADCMD_VREFPVDD33
> >>  +		       | JZ_ADC_REG_ADCMD_XPADC,
> >>  +		       adc->base + JZ_ADC_REG_ADCMD);
> >>  +	}
> >>  +
> >>  +	/* We're done */
> >>  +	writel(0, adc->base + JZ_ADC_REG_ADCMD);
> >>  +
> >>  +	mutex_unlock(&adc->lock);
> >>  +}
> >>  +
> >>   static void ingenic_adc_set_config(struct ingenic_adc *adc,
> >>   				   uint32_t mask,
> >>   				   uint32_t val)
> >>  @@ -288,6 +380,72 @@ static const struct iio_chan_spec 
> >> jz4740_channels[] = {
> >>   };
> >> 
> >>   static const struct iio_chan_spec jz4770_channels[] = {
> >>  +	{
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_XP,  
> > 
> > Ah. sorry. I should have noticed this much earlier.
> > 
> > These aren't position channels as such.  They are channels
> > that are then processed into position in combination.
> > 
> > Problem is I'm not sure how we 'should' describe then.
> > 
> > Perhaps this is the best we can do.  
> 
> We could have the two differencial channels as IIO_POSITIONRELATIVE, 
> and the four single-ended ones as IIO_VOLTAGE.
> 
> Cheers,
> -Paul
> 
> >>  +		.scan_index = 0,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16,
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_YP,
> >>  +		.scan_index = 1,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16,
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_XN,
> >>  +		.scan_index = 2,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16,
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_YN,
> >>  +		.scan_index = 3,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16,
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_XD,
> >>  +		.scan_index = 4,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16,
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_YD,
> >>  +		.scan_index = 5,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16,
> >>  +		},
> >>  +	},
> >>   	{
> >>   		.extend_name = "aux",
> >>   		.type = IIO_VOLTAGE,
> >>  @@ -490,13 +648,89 @@ static const struct iio_info ingenic_adc_info 
> >> = {
> >>   	.of_xlate = ingenic_adc_of_xlate,
> >>   };
> >> 
> >>  +static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +	int ret;
> >>  +
> >>  +	ret = clk_enable(adc->clk);
> >>  +	if (ret) {
> >>  +		dev_err(iio_dev->dev.parent, "Failed to enable clock: %d\n",
> >>  +			ret);
> >>  +		return ret;
> >>  +	}
> >>  +
> >>  +	/* It takes significant time for the touchscreen hw to stabilize. 
> >> */
> >>  +	msleep(50);
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
> >>  +			       JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
> >>  +			       JZ_ADC_REG_CFG_PULL_UP(4));
> >>  +
> >>  +	writew(80, adc->base + JZ_ADC_REG_ADWAIT);
> >>  +	writew(2, adc->base + JZ_ADC_REG_ADSAME);
> >>  +	writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
> >>  +	writel(0, adc->base + JZ_ADC_REG_ADTCH);
> >>  +
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_CMD_SEL,
> >>  +			       JZ_ADC_REG_CFG_CMD_SEL);
> >>  +	ingenic_adc_set_adcmd(iio_dev, iio_dev->active_scan_mask[0]);
> >>  +
> >>  +	ingenic_adc_enable(adc, 2, true);
> >>  +
> >>  +	return 0;
> >>  +}
> >>  +
> >>  +static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +
> >>  +	ingenic_adc_enable(adc, 2, false);
> >>  +
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_CMD_SEL, 0);
> >>  +
> >>  +	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
> >>  +	writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
> >>  +	writew(0, adc->base + JZ_ADC_REG_ADSAME);
> >>  +	writew(0, adc->base + JZ_ADC_REG_ADWAIT);
> >>  +	clk_disable(adc->clk);
> >>  +
> >>  +	return 0;
> >>  +}
> >>  +
> >>  +static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops 
> >> = {
> >>  +	.postenable = &ingenic_adc_buffer_enable,
> >>  +	.predisable = &ingenic_adc_buffer_disable
> >>  +};
> >>  +
> >>  +static irqreturn_t ingenic_adc_irq(int irq, void *data)
> >>  +{
> >>  +	struct iio_dev *iio_dev = data;
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +	unsigned long mask = iio_dev->active_scan_mask[0];
> >>  +	unsigned int i;
> >>  +	u32 tdat[3];
> >>  +
> >>  +	for (i = 0; i < ARRAY_SIZE(tdat); mask >>= 2, i++) {
> >>  +		if (mask & 0x3)
> >>  +			tdat[i] = readl(adc->base + JZ_ADC_REG_ADTCH);
> >>  +		else
> >>  +			tdat[i] = 0;
> >>  +	}
> >>  +
> >>  +	iio_push_to_buffers(iio_dev, tdat);
> >>  +	writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
> >>  +
> >>  +	return IRQ_HANDLED;
> >>  +}
> >>  +
> >>   static int ingenic_adc_probe(struct platform_device *pdev)
> >>   {
> >>   	struct device *dev = &pdev->dev;
> >>   	struct iio_dev *iio_dev;
> >>   	struct ingenic_adc *adc;
> >>   	const struct ingenic_adc_soc_data *soc_data;
> >>  -	int ret;
> >>  +	int irq, ret;
> >> 
> >>   	soc_data = device_get_match_data(dev);
> >>   	if (!soc_data)
> >>  @@ -511,6 +745,17 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >>   	mutex_init(&adc->aux_lock);
> >>   	adc->soc_data = soc_data;
> >> 
> >>  +	irq = platform_get_irq(pdev, 0);
> >>  +	if (irq < 0)
> >>  +		return irq;
> >>  +
> >>  +	ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
> >>  +			       dev_name(dev), iio_dev);
> >>  +	if (ret < 0) {
> >>  +		dev_err(dev, "Failed to request irq: %d\n", ret);
> >>  +		return ret;
> >>  +	}
> >>  +
> >>   	adc->base = devm_platform_ioremap_resource(pdev, 0);
> >>   	if (IS_ERR(adc->base))
> >>   		return PTR_ERR(adc->base);
> >>  @@ -550,7 +795,8 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >> 
> >>   	iio_dev->dev.parent = dev;
> >>   	iio_dev->name = "jz-adc";
> >>  -	iio_dev->modes = INDIO_DIRECT_MODE;
> >>  +	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> >>  +	iio_dev->setup_ops = &ingenic_buffer_setup_ops;
> >>   	iio_dev->channels = soc_data->channels;
> >>   	iio_dev->num_channels = soc_data->num_channels;
> >>   	iio_dev->info = &ingenic_adc_info;  
> >   
> 
> 

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