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Date: Tue, 27 May 2014 20:22:04 +0200
From: trem <tremyfr@...oo.fr>
To: Hartmut Knaack <knaack.h@....de>
CC: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
armadeus-forum@...ts.sourceforge.net, jic23@...nel.org
Subject: Re: [PATCH v2] iio: add support of the max1027
Hi Harmut,
On 27/05/14 00:33, Hartmut Knaack wrote:
> trem schrieb:
>> Hi Hartmut,
>>
>> First, thanks a lot for this feedback, I really appreciate it.
>>
>>
>> On 26/05/14 00:52, Hartmut Knaack wrote:
>>> Philippe Reynes schrieb:
>>>> This driver add partial support of the
>>>> maxim 1027/1029/1031. Differential mode is not
>>>> supported.
>>>>
>>>> It was tested on armadeus apf27 board.
>>>>
>>>> Signed-off-by: Philippe Reynes<tremyfr@...oo.fr>
>>>> ---
>>>> .../devicetree/bindings/iio/adc/max1027-adc.txt | 21 +
>>>> drivers/staging/iio/adc/Kconfig | 9 +
>>>> drivers/staging/iio/adc/Makefile | 1 +
>>>> drivers/staging/iio/adc/max1027.c | 553 ++++++++++++++++++++
>>>> 4 files changed, 584 insertions(+), 0 deletions(-)
>>>> create mode 100644 Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
>>>> create mode 100644 drivers/staging/iio/adc/max1027.c
>>>>
>>>> Changelog:
>>>> v2: (thanks Hartmut Knaack and Jonathan Cameron for the feedback)
>>>> - really use devm_*
>>>> - use demux magic
>>>> - use spi_read and spi_write (instead of spi_sync)
>>>> - use define for register (instead of hardcoded value)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt b/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
>>>> new file mode 100644
>>>> index 0000000..2e8b9f3
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
>>>> @@ -0,0 +1,21 @@
>>>> +* Maxim 1027/1029/1031 Analog to Digital Converter (ADC)
>>>> +
>>>> +Required properties:
>>>> + - compatible: Should be "maxim,max1027" or "maxim,max1029" or "maxim,max1031"
>>>> + - reg: Should contain the ADC SPI address
>>>> + - interrupt-parent: the phandle for the gpio controller
>>>> + - interrupts: (gpio) interrupt to which the chip is connected
>>>> +
>>>> +Example:
>>>> +adc@0 {
>>>> + compatible = "maxim,max1027";
>>>> + reg =<0>;
>>>> + interrupt-parent =<&gpio5>;
>>>> + interrupts =<15 IRQ_TYPE_EDGE_RISING>;
>>>> + pinctrl-names = "default";
>>>> + pinctrl-0 =<&pinctrl_max1027>;
>>>> + /* SPI mode = 0 */
>>>> + spi-cpol =<0>;
>>>> + spi-cpha =<0>;
>>>> + spi-max-frequency =<1000000>;
>>>> +};
>>>> diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
>>>> index 3633298..12a78eb 100644
>>>> --- a/drivers/staging/iio/adc/Kconfig
>>>> +++ b/drivers/staging/iio/adc/Kconfig
>>>> @@ -112,6 +112,15 @@ config LPC32XX_ADC
>>>> activate only one via device tree selection. Provides direct access
>>>> via sysfs.
>>>>
>>>> +config MAX1027
>>>> + tristate "Maxim max1027 ADC driver"
>>>> + depends on SPI
>>>> + select IIO_BUFFER
>>>> + select IIO_TRIGGERED_BUFFER
>>>> + help
>>>> + Say yes here to build support for Maxim SPI ADC models
>>>> + max1027, max1029 and max1031.
>>>> +
>>>> config MXS_LRADC
>>>> tristate "Freescale i.MX23/i.MX28 LRADC"
>>>> depends on ARCH_MXS || COMPILE_TEST
>>>> diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
>>>> index 3e9fb14..22fbd0c 100644
>>>> --- a/drivers/staging/iio/adc/Makefile
>>>> +++ b/drivers/staging/iio/adc/Makefile
>>>> @@ -18,5 +18,6 @@ obj-$(CONFIG_AD7816) += ad7816.o
>>>> obj-$(CONFIG_AD7192) += ad7192.o
>>>> obj-$(CONFIG_AD7280) += ad7280a.o
>>>> obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
>>>> +obj-$(CONFIG_MAX1027) += max1027.o
>>>> obj-$(CONFIG_MXS_LRADC) += mxs-lradc.o
>>>> obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
>>>> diff --git a/drivers/staging/iio/adc/max1027.c b/drivers/staging/iio/adc/max1027.c
>>>> new file mode 100644
>>>> index 0000000..c2e5936
>>>> --- /dev/null
>>>> +++ b/drivers/staging/iio/adc/max1027.c
>>>> @@ -0,0 +1,553 @@
>>>> + /*
>>>> + * iio/adc/max1027.c
>>>> + * Copyright (C) 2014 Philippe Reynes
>>>> + *
>>>> + * based on linux/drivers/iio/ad7923.c
>>>> + * Copyright 2011 Analog Devices Inc (from AD7923 Driver)
>>>> + * Copyright 2012 CS Systemes d'Information
>>>> + *
>>>> + * This program is free software; you can redistribute it and/or modify
>>>> + * it under the terms of the GNU General Public License version 2 as
>>>> + * published by the Free Software Foundation.
>>>> + *
>>>> + * max1027.c
>>>> + *
>>>> + * Partial support for max1027 and similar chips.
>>>> + */
>>>> +
>>>> +#include<linux/kernel.h>
>>>> +#include<linux/spi/spi.h>
>>>> +#include<linux/module.h>
>>>> +#include<linux/interrupt.h>
>>>> +#include<linux/mutex.h>
>>>> +#include<linux/of.h>
>>>> +#include<linux/of_gpio.h>
>>>> +#include<linux/platform_device.h>
>>>> +#include<linux/delay.h>
>>>> +#include<linux/gpio.h>
>>>> +
>>>> +#include<linux/iio/iio.h>
>>>> +#include<linux/iio/buffer.h>
>>>> +#include<linux/iio/trigger.h>
>>>> +#include<linux/iio/trigger_consumer.h>
>>>> +#include<linux/iio/triggered_buffer.h>
>>>> +
>>>> +#define MAX1027_CONV_REG 0x80
>>>> +#define MAX1027_SETUP_REG 0x40
>>>> +#define MAX1027_AVG_REG 0x20
>>>> +#define MAX1027_RST_REG 0x10
>>>> +
>>>> +/* conversion register */
>>>> +#define MAX1027_TEMP 0x01
>>>> +#define MAX1027_SCAN_0_N (0x00<< 1)
>>>> +#define MAX1027_SCAN_N_M (0x01<< 1)
>>>> +#define MAX1027_SCAN_N (0x02<< 1)
>>>> +#define MAX1027_NOSCAN (0x03<< 1)
>>>> +#define MAX1027_CHAN(n) ((n)<< 3)
>>>> +
>>>> +/* setup register */
>>>> +#define MAX1027_UNIPOLAR 0x02
>>>> +#define MAX1027_BIPOLAR 0x03
>>>> +#define MAX1027_REF_MODE0 (0x00<< 2)
>>>> +#define MAX1027_REF_MODE1 (0x01<< 2)
>>>> +#define MAX1027_REF_MODE2 (0x02<< 2)
>>>> +#define MAX1027_REF_MODE3 (0x03<< 2)
>>>> +#define MAX1027_CKS_MODE0 (0x00<< 4)
>>>> +#define MAX1027_CKS_MODE1 (0x01<< 4)
>>>> +#define MAX1027_CKS_MODE2 (0x02<< 4)
>>>> +#define MAX1027_CKS_MODE3 (0x03<< 4)
>>>> +
>>>> +/* averaging register */
>>>> +#define MAX1027_NSCAN_4 0x00
>>>> +#define MAX1027_NSCAN_8 0x01
>>>> +#define MAX1027_NSCAN_12 0x02
>>>> +#define MAX1027_NSCAN_16 0x03
>>>> +#define MAX1027_NAVG_4 (0x00<< 2)
>>>> +#define MAX1027_NAVG_8 (0x01<< 2)
>>>> +#define MAX1027_NAVG_12 (0x02<< 2)
>>>> +#define MAX1027_NAVG_16 (0x03<< 2)
>>> According to my datasheet (revision 5) [http://datasheets.maximintegrated.com/en/ds/MAX1027-MAX1031.pdf], there is no NAVG_12, but NAVG_16 (0x02<< 2) and NAVG_32 (0x03<< 2).
>> My datasheet has the same value, I'll fix this mistake in v3.
>>
>>>> +#define MAX1027_AVG_EN (0x01<< 4)
>>>> +
>>>> +enum max1027_id {
>>>> + max1027,
>>>> + max1029,
>>>> + max1031,
>>>> +};
>>>> +
>>>> +static const struct spi_device_id max1027_id[] = {
>>>> + {"max1027", max1027},
>>>> + {"max1029", max1029},
>>>> + {"max1031", max1031},
>>>> + {}
>>>> +};
>>>> +MODULE_DEVICE_TABLE(spi, max1027_id);
>>>> +
>>>> +#ifdef CONFIG_OF
>>>> +static const struct of_device_id max1027_adc_dt_ids[] = {
>>>> + { .compatible = "maxim,max1027" },
>>>> + { .compatible = "maxim,max1029" },
>>>> + { .compatible = "maxim,max1031" },
>>>> + {},
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, max1027_adc_dt_ids);
>>>> +#endif
>>>> +
>>>> +#define MAX1027_V_CHAN(index) \
>>>> + { \
>>>> + .type = IIO_VOLTAGE, \
>>>> + .indexed = 1, \
>>>> + .channel = index, \
>>>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
>>>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
>>>> + .address = index, \
>>>> + .scan_index = index+1, \
>>>> + .scan_type = { \
>>>> + .sign = 'u', \
>>>> + .realbits = 10, \
>>>> + .storagebits = 16, \
>>>> + .shift = 2, \
>>>> + .endianness = IIO_BE, \
>>>> + }, \
>>>> + }
>>>> +
>>>> +#define MAX1027_T_CHAN(index) \
>>>> + { \
>>>> + .type = IIO_TEMP, \
>>>> + .indexed = 0, \
>>>> + .channel = index, \
>>>> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
>>>> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
>>>> + .address = index, \
>>>> + .scan_index = index, \
>>>> + .scan_type = { \
>>>> + .sign = 'u', \
>>>> + .realbits = 12, \
>>>> + .storagebits = 16, \
>>>> + .endianness = IIO_BE, \
>>>> + }, \
>>>> + }
>>>> +
>>>> +static const struct iio_chan_spec max1027_channels[] = {
>>>> + MAX1027_T_CHAN(0),
>>>> + MAX1027_V_CHAN(0),
>>>> + MAX1027_V_CHAN(1),
>>>> + MAX1027_V_CHAN(2),
>>>> + MAX1027_V_CHAN(3),
>>>> + MAX1027_V_CHAN(4),
>>>> + MAX1027_V_CHAN(5),
>>>> + MAX1027_V_CHAN(6),
>>>> + MAX1027_V_CHAN(7)
>>>> +};
>>>> +
>>>> +static const struct iio_chan_spec max1029_channels[] = {
>>>> + MAX1027_T_CHAN(0),
>>>> + MAX1027_V_CHAN(0),
>>>> + MAX1027_V_CHAN(1),
>>>> + MAX1027_V_CHAN(2),
>>>> + MAX1027_V_CHAN(3),
>>>> + MAX1027_V_CHAN(4),
>>>> + MAX1027_V_CHAN(5),
>>>> + MAX1027_V_CHAN(6),
>>>> + MAX1027_V_CHAN(7),
>>>> + MAX1027_V_CHAN(8),
>>>> + MAX1027_V_CHAN(9),
>>>> + MAX1027_V_CHAN(10),
>>>> + MAX1027_V_CHAN(11)
>>>> +};
>>>> +
>>>> +static const struct iio_chan_spec max1031_channels[] = {
>>>> + MAX1027_T_CHAN(0),
>>>> + MAX1027_V_CHAN(0),
>>>> + MAX1027_V_CHAN(1),
>>>> + MAX1027_V_CHAN(2),
>>>> + MAX1027_V_CHAN(3),
>>>> + MAX1027_V_CHAN(4),
>>>> + MAX1027_V_CHAN(5),
>>>> + MAX1027_V_CHAN(6),
>>>> + MAX1027_V_CHAN(7),
>>>> + MAX1027_V_CHAN(8),
>>>> + MAX1027_V_CHAN(9),
>>>> + MAX1027_V_CHAN(10),
>>>> + MAX1027_V_CHAN(11),
>>>> + MAX1027_V_CHAN(12),
>>>> + MAX1027_V_CHAN(13),
>>>> + MAX1027_V_CHAN(14),
>>>> + MAX1027_V_CHAN(15)
>>>> +};
>>>> +
>>>> +static unsigned long max1027_available_scan_masks[] = {
>>>> + 0x00ff,
>>>> + 0x0000,
>>>> +};
>>>> +
>>>> +static unsigned long max1029_available_scan_masks[] = {
>>>> + 0x0fff,
>>>> + 0x0000,
>>>> +};
>>>> +
>>>> +static unsigned long max1031_available_scan_masks[] = {
>>>> + 0xffff,
>>>> + 0x0000,
>>>> +};
>>>> +
>>>> +struct max1027_chip_info {
>>>> + const struct iio_chan_spec *channels;
>>>> + unsigned int num_channels;
>>>> + unsigned long *available_scan_masks;
>>>> +};
>>>> +
>>>> +static const struct max1027_chip_info max1027_chip_info_tbl[] = {
>>>> + [max1027] = {
>>>> + .channels = max1027_channels,
>>>> + .num_channels = ARRAY_SIZE(max1027_channels),
>>>> + .available_scan_masks = max1027_available_scan_masks,
>>>> + },
>>>> + [max1029] = {
>>>> + .channels = max1029_channels,
>>>> + .num_channels = ARRAY_SIZE(max1029_channels),
>>>> + .available_scan_masks = max1029_available_scan_masks,
>>>> + },
>>>> + [max1031] = {
>>>> + .channels = max1031_channels,
>>>> + .num_channels = ARRAY_SIZE(max1031_channels),
>>>> + .available_scan_masks = max1031_available_scan_masks,
>>>> + },
>>>> +};
>>>> +
>>>> +struct max1027_state {
>>>> + struct max1027_chip_info *info;
>>>> + struct spi_device *spi;
>>>> + struct iio_trigger *trig;
>>>> + unsigned short *buffer;
>>> Better use u16 for buffer?
>> Yes, fixed in v3.
>>
>>>> +};
>>>> +
>>>> +static int max1027_write_register(struct max1027_state *st, unsigned char reg)
>>>> +{
>>>> + int ret;
>>>> +
>>>> + pr_debug("%s(st = 0x%p, reg = 0x%02x)\n", __func__, st, reg);
>>>> +
>>>> + ret = spi_write(st->spi, (void *)®, 1);
>>>> + if (ret< 0)
>>>> + pr_err("can't write register\n");
>>>> +
>>>> + return ret;
>>>> +}
>>> As Jonathan pointed out, better get rid of those debug wrapper functions. Otherwise, think about using typedefs like u8 for 8 bit registers.
>> I've remove this function (and max10247_read_value) in v3.
>>
>>>> +
>>>> +static int max1027_read_value(struct max1027_state *st, int len)
>>>> +{
>>>> + int ret;
>>>> +
>>>> + pr_debug("%s(st = 0x%p, len = %d)\n", __func__, st, len);
>>>> +
>>>> + ret = spi_read(st->spi, st->buffer, len);
>>>> + if (ret< 0)
>>>> + pr_err("can't read value\n");
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static int max1027_read_single_value(struct iio_dev *indio_dev,
>>>> + struct iio_chan_spec const *chan,
>>>> + int *val, int *val2, long mask)
>>> val2 and mask are not used.
>> I'll remove it in v3.
>>
>>>> +{
>>>> + int ret;
>>>> + unsigned char reg;
>>>> + struct max1027_state *st = iio_priv(indio_dev);
>>>> +
>>>> + if (iio_buffer_enabled(indio_dev)) {
>>>> + dev_warn(&indio_dev->dev, "trigger mode already enabled");
>>>> + return -EIO;
>>>> + }
>>>> +
>>>> + /* Start acquisition on conversion register write */
>>>> + reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;
>>>> + ret = max1027_write_register(st, reg);
>>>> + if (ret< 0) {
>>>> + dev_err(&indio_dev->dev,
>>>> + "Failed to configure setup register\n");
>>>> + return ret;
>>>> + }
>>>> +
>>>> + /* Configure conversion register with the requested chan */
>>>> + reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel)
>>>> + | MAX1027_NOSCAN | !!(chan->type == IIO_TEMP);
>>>> + ret = max1027_write_register(st, reg);
>>>> + if (ret< 0) {
>>>> + dev_err(&indio_dev->dev,
>>>> + "Failed to configure conversion register\n");
>>>> + return ret;
>>>> + }
>>>> +
>>>> + /*
>>>> + * For an unknown reason, when we use the mode "10" (write
>>>> + * conversion register), the it doesn't occur every time.
>>> I still don't understand this comment.
>> For an unknown reason, the max1027 on my armadeus apf27 don't raise
>> an it when I use the mode "10" (acquisition started on convertion write).
>> In fact, it's weird, there is an IT when I read temperature, but not
>> when I read a voltage.
> So what is "IT"? "Internally timed" or some abbreviation for interrupt?
Sorry, I use IT as abbreviation for interrupt.
you can see in the following log that gpio-mxc (EOC) isn't incremented
when I read the voltage, but it's incremented when I read the temperature.
>>
>> # grep max /proc/interrupts
>> 223: 110213 gpio-mxc 15 max1027
>> 272: 110200 max1027-trigger
>>
>>
>> # cat /sys/bus/iio/devices/iio\:device0/in_voltage0_raw
>> 2589
>> # grep max /proc/interrupts
>> 223: 110213 gpio-mxc 15 max1027
>> 272: 110200 max1027-trigger
>>
>> # cat /sys/bus/iio/devices/iio\:device0/in_temp_raw
>> 214
>> # grep max /proc/interrupts
>> 223: 110214 gpio-mxc 15 max1027
>> 272: 110200 max1027-trigger
>>
>> So with mode "10", I use a delay of 1 ms.
>>
>>
>>
>>>> + * So we just wait 1 ms.
>>>> + */
>>>> + mdelay(1);
>>>> +
>>>> + /* Read result */
>>>> + ret = max1027_read_value(st, (chan->type == IIO_TEMP) ? 4 : 2);
>>> I guess I didn't have a look into the datasheet before, when reviewing this part, but could you point me to where it is stated, that temperature measurements take 4 bytes?
>> When the temperature is read, the voltage is also read. So 4 bytes need to be read in the FIFO,
>> 2 for the temperature, 2 for the voltage.
>>
>> This is described in the "Internal FIFO" paragraph.
> I read there: "The first 2 bytes of data read out after a temperature measurement always contain the temperature result preceded by four leading zeros, MSB first.". So my interpretation would be, that you could just read those 2 bytes as the temperature and ignore any further data. But that datasheet is not one of the best I've ever read. Any other opinions?
(I agree, it's not the best datasheet I ever read)
My opinion is that if I don't read the "voltage" value, this value stay in the FIFO, and I'll read it next time I try to read a value.
So I read to remove it from the FIFO.
>>
>>>> + if (ret< 0)
>>>> + return ret;
>>>> +
>>>> + *val = be16_to_cpu(st->buffer[0]);
>>>> +
>>>> + return IIO_VAL_INT;
>>>> +}
>>>> +
>>>> +static int max1027_read_raw(struct iio_dev *indio_dev,
>>>> + struct iio_chan_spec const *chan,
>>>> + int *val, int *val2, long mask)
>>>> +{
>>>> + int ret = 0;
>>>> +
>>>> + switch (mask) {
>>>> + case IIO_CHAN_INFO_RAW:
>>>> + ret = max1027_read_single_value(indio_dev, chan,
>>>> + val, val2, mask);
>>>> + break;
>>>> + case IIO_CHAN_INFO_SCALE:
>>>> + switch (chan->type) {
>>>> + case IIO_TEMP:
>>>> + *val = 1;
>>>> + *val2 = 8;
>>>> + ret = IIO_VAL_FRACTIONAL;
>>>> + break;
>>>> + case IIO_VOLTAGE:
>>>> + *val = 2500;
>>>> + *val2 = 10;
>>>> + ret = IIO_VAL_FRACTIONAL_LOG2;
>>>> + break;
>>>> + default:
>>>> + ret = -EINVAL;
>>>> + break;
>>>> + };
>>>> + break;
>>>> + default:
>>>> + ret = -EINVAL;
>>>> + break;
>>>> + };
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static int max1027_update_scan_mode(struct iio_dev *indio_dev,
>>>> + const unsigned long *scan_mask)
>>>> +{
>>>> + pr_debug("%s(indio_dev=0x%p, scan_mask=0x%p)\n",
>>>> + __func__, indio_dev, scan_mask);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int max1027_debugfs_reg_access(struct iio_dev *indio_dev,
>>>> + unsigned reg, unsigned writeval,
>>>> + unsigned *readval)
>>>> +{
>>>> + struct max1027_state *st = iio_priv(indio_dev);
>>>> +
>>>> + if (readval != NULL)
>>>> + return -EINVAL;
>>>> +
>>>> + return max1027_write_register(st, writeval);
>>>> +}
>>>> +
>>>> +static int max1027_set_trigger_state(struct iio_trigger *trig, bool state)
>>>> +{
>>>> + struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
>>>> + struct max1027_state *st = iio_priv(indio_dev);
>>>> + unsigned char reg;
>>>> + int ret;
>>>> +
>>>> + if (state) {
>>>> + /* Start acquisition on cnvst */
>>>> + reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE0 | MAX1027_REF_MODE2;
>>>> + ret = max1027_write_register(st, reg);
>>>> + if (ret< 0)
>>>> + return ret;
>>>> +
>>>> + /* Scan from 0 to max */
>>>> + reg = MAX1027_CONV_REG | MAX1027_CHAN(0)
>>>> + | MAX1027_SCAN_N_M | MAX1027_TEMP;
>>>> + ret = max1027_write_register(st, reg);
>>>> + if (ret< 0)
>>>> + return ret;
>>>> + } else {
>>>> + /* Start acquisition on conversion register write */
>>>> + reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;
>>> Just for improved readability, keep the same order as above (MSB to LSB in your case).
>> You're right, it's better, I'll fix it in v3.
>>
>>>> + ret = max1027_write_register(st, reg);
>>>> + if (ret< 0)
>>>> + return ret;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static irqreturn_t max1027_interrupt_handler(int irq, void *private)
>>>> +{
>>>> + struct iio_dev *indio_dev = (struct iio_dev *)private;
>>>> +
>>>> + pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq, private);
>>>> +
>>>> + if (iio_buffer_enabled(indio_dev))
>>>> + iio_trigger_poll(indio_dev->trig, iio_get_time_ns());
>>>> +
>>>> + return IRQ_HANDLED;
>>>> +}
>>>> +
>>>> +static irqreturn_t max1027_trigger_handler(int irq, void *private)
>>>> +{
>>>> + struct iio_poll_func *pf = (struct iio_poll_func *)private;
>>>> + struct iio_dev *indio_dev = pf->indio_dev;
>>>> + struct max1027_state *st = iio_priv(indio_dev);
>>>> +
>>>> + pr_debug("%s(irq=%d, private=0x%p)\n", __func__, irq, private);
>>>> +
>>>> + /* fill buffer with all channel */
>>>> + max1027_read_value(st, indio_dev->masklength * 2);
>>>> +
>>>> + iio_push_to_buffers_with_timestamp(indio_dev, st->buffer,
>>>> + iio_get_time_ns());
>>>> +
>>>> + iio_trigger_notify_done(indio_dev->trig);
>>>> +
>>>> + return IRQ_HANDLED;
>>>> +}
>>>> +
>>>> +static const struct iio_trigger_ops max1027_trigger_ops = {
>>>> + .owner = THIS_MODULE,
>>>> + .set_trigger_state =&max1027_set_trigger_state,
>>>> +};
>>>> +
>>>> +static const struct iio_info max1027_info = {
>>>> + .driver_module = THIS_MODULE,
>>>> + .read_raw =&max1027_read_raw,
>>>> + .update_scan_mode =&max1027_update_scan_mode,
>>>> + .debugfs_reg_access =&max1027_debugfs_reg_access,
>>>> +};
>>>> +
>>>> +static int max1027_probe(struct spi_device *spi)
>>>> +{
>>>> + int err;
>>>> + struct iio_dev *indio_dev;
>>>> + struct max1027_state *st;
>>>> +
>>>> + pr_debug("%s: probe(spi = 0x%p)\n", __func__, spi);
>>>> +
>>>> + /* allocate iio device */
>>>> + indio_dev = devm_iio_device_alloc(&spi->dev,
>>>> + sizeof(struct max1027_state));
>>>> + if (!indio_dev) {
>>>> + pr_err("can't allocate iio device\n");
>>>> + return -ENOMEM;
>>>> + }
>>>> +
>>>> + spi_set_drvdata(spi, indio_dev);
>>>> +
>>>> + st = iio_priv(indio_dev);
>>>> + st->spi = spi;
>>>> + st->buffer = NULL;
>>>> + st->info = (struct max1027_chip_info *)
>>>> + &max1027_chip_info_tbl[spi_get_device_id(spi)->driver_data];
>>>> +
>>>> + /* request irq */
>>>> + err = devm_request_threaded_irq(&spi->dev, spi->irq,
>>>> + max1027_interrupt_handler,
>>>> + NULL,
>>>> + IRQF_TRIGGER_FALLING,
>>>> + spi->dev.driver->name, indio_dev);
>>>> + if (err) {
>>>> + dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
>>>> + return err;
>>>> + }
>>>> +
>>>> + indio_dev->name = spi_get_device_id(spi)->name;
>>>> + indio_dev->dev.parent =&spi->dev;
>>>> + indio_dev->info =&max1027_info;
>>>> + indio_dev->modes = INDIO_DIRECT_MODE;
>>>> + indio_dev->channels = st->info->channels;
>>>> + indio_dev->num_channels = st->info->num_channels;
>>>> + indio_dev->available_scan_masks = st->info->available_scan_masks;
>>>> +
>>>> + /* Allocate buffer (data) */
>>>> + st->buffer = devm_kmalloc(&indio_dev->dev,
>>>> + indio_dev->num_channels * 2,
>>>> + GFP_KERNEL);
>>>> + if (st->buffer == NULL) {
>>> As picky as I am, I could ask why you check for successful allocation in a different way than above for indio_dev ;-)
>> I don't really know, but I'll update it to always use the same way for the "post allocation check".
>> I'll update it in v3.
>>
>>>> + dev_err(&indio_dev->dev, "Can't allocate bufffer\n");
>>>> + return -ENOMEM;
>>>> + }
>>>> +
>>>> + /* Allocate buffer */
>>>> + err = iio_triggered_buffer_setup(indio_dev,&iio_pollfunc_store_time,
>>>> + &max1027_trigger_handler, NULL);
>>>> + if (err< 0) {
>>>> + dev_err(&indio_dev->dev, "Failed to setup buffer\n");
>>>> + return err;
>>>> + }
>>>> +
>>>> + /* Allocate trigger */
>>>> + st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
>>>> + indio_dev->name);
>>>> + if (st->trig == NULL) {
>>>> + err = -ENOMEM;
>>>> + dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
>>>> + goto fail_trigger_alloc;
>>>> + }
>>>> +
>>>> + /* configure and register trigger */
>>>> + st->trig->ops =&max1027_trigger_ops;
>>>> + st->trig->dev.parent =&spi->dev;
>>>> + iio_trigger_set_drvdata(st->trig, indio_dev);
>>>> + iio_trigger_register(st->trig);
>>>> +
>>>> + /* Disable averaging */
>>>> + err = max1027_write_register(st, MAX1027_AVG_REG);
>>>> + if (err< 0) {
>>>> + dev_err(&indio_dev->dev, "Failed to configure averaging register\n");
>>>> + goto fail_dev_register;
>>>> + }
>>>> +
>>>> + /* Register the device */
>>>> + err = iio_device_register(indio_dev);
>>>> + if (err< 0) {
>>>> + dev_err(&indio_dev->dev, "Failed to register iio device\n");
>>>> + goto fail_dev_register;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +
>>>> +fail_dev_register:
>>>> +fail_trigger_alloc:
>>>> + iio_triggered_buffer_cleanup(indio_dev);
>>>> +
>>>> + return err;
>>>> +}
>>>> +
>>>> +static int max1027_remove(struct spi_device *spi)
>>>> +{
>>>> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
>>>> +
>>>> + pr_debug("%s: remove(spi = 0x%p)\n", __func__, spi);
>>>> +
>>>> + iio_device_unregister(indio_dev);
>>>> + iio_triggered_buffer_cleanup(indio_dev);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static struct spi_driver max1027_driver = {
>>>> + .driver = {
>>>> + .name = "max1027",
>>>> + .owner = THIS_MODULE,
>>>> + },
>>>> + .probe = max1027_probe,
>>>> + .remove = max1027_remove,
>>>> + .id_table = max1027_id,
>>>> +};
>>>> +module_spi_driver(max1027_driver);
>>>> +
>>>> +MODULE_AUTHOR("Philippe Reynes<tremyfr@...oo.fr>");
>>>> +MODULE_DESCRIPTION("MAX1027/MAX1029/MAX1031 ADC");
>>>> +MODULE_LICENSE("GPL v2");
>>>
>> Best regards,
>> Philippe
>> --
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>
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