Re: [PATCH v7] iio: add support of the max1027

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On 16/06/14 21:06, Jonathan Cameron wrote:
On 14/06/14 23:27, Philippe Reynes wrote:
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@xxxxxxxx>
I'm happy with this now.

Hartmut, anything else you want to raise, or do you want to add
a reviewed by? No particular rush at this point in a cycle so
would be nice to acknowledge your hard work - I am very pleased
to see how my reviewing you (and others!) are now doing on this
list.  Makes my side of things much more manageable!
I'll take that as a no ;)

Applied to the togreg branch of iio.git.  Will be initially pushed
out as testing to let the autobuilders work their magic.

Thanks. It's always a little bruising to go through to V7 on a patch
so thanks for keeping at it!

Jonathan

J
---
  .../devicetree/bindings/iio/adc/max1027-adc.txt    |   22 +
  drivers/iio/adc/Kconfig                            |    9 +
  drivers/iio/adc/Makefile                           |    1 +
  drivers/iio/adc/max1027.c                          |  521 ++++++++++++++++++++
  4 files changed, 553 insertions(+), 0 deletions(-)
  create mode 100644 Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
  create mode 100644 drivers/iio/adc/max1027.c

Changelog:
v7: (thanks Hartmut Knaack and Jonathan Cameron for the feedback)
- use const with info in max1027_state
- use bitops.h (and BIT)
- separate operators with whitespace
- define a reg member in max1027_state

v6: (thanks Peter Meerwald for the feedback)
- dont use index with temperature
- use const on scan mask
- use __be16 * for buffer
- return -EBUSY if trigger is already running
- replace it by interrupt in comment
- dont finish case with ";"
- use iio_push_to_buffers
- remove useless initialization of st->buffer
- remove useless obvious comment

v5: (thanks Jonathan Cameron for the feedback)
- add validate_trigger
- add validate_device
- remove useless (void *) cast
- use allocated buffer for spi_write

v4: (thanks Jonathan Cameron for the feedback)
- use iio_trigger_generic_data_rdy_poll

v3: (thanks Hartmut Knaack, Lars-Peter Clausen and Jonathan Cameron for the feedback)
- move to drivers/iio/adc (was in staging)
- clean binding doc
- drop empty update_scan_mode callback
- add a lock around single channel read code
- remove useless wrappers around spi_write and spi_read
- fix available scan mask (a bit was missing)
- remove useless header
- some others little cleanp

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..a8770cc
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/adc/max1027-adc.txt
@@ -0,0 +1,22 @@
+* Maxim 1027/1029/1031 Analog to Digital Converter (ADC)
+
+Required properties:
+  - compatible: Should be "maxim,max1027" or "maxim,max1029" or "maxim,max1031"
+  - reg: SPI chip select number for the device
+  - interrupt-parent: phandle to the parent interrupt controller
+  see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+  - interrupts: IRQ line for the ADC
+  see: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+Recommended properties:
+- spi-max-frequency: Definition as per
+                     Documentation/devicetree/bindings/spi/spi-bus.txt
+
+Example:
+adc@0 {
+    compatible = "maxim,max1027";
+    reg = <0>;
+    interrupt-parent = <&gpio5>;
+    interrupts = <15 IRQ_TYPE_EDGE_RISING>;
+    spi-max-frequency = <1000000>;
+};
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index a80d236..20a7073 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -131,6 +131,15 @@ config LP8788_ADC
      help
        Say yes here to build support for TI LP8788 ADC.

+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 MAX1363
      tristate "Maxim max1363 ADC driver"
      depends on I2C
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 9d60f2d..38cf5c3 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -15,6 +15,7 @@ obj-$(CONFIG_AD799X) += ad799x.o
  obj-$(CONFIG_AT91_ADC) += at91_adc.o
  obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
  obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
+obj-$(CONFIG_MAX1027) += max1027.o
  obj-$(CONFIG_MAX1363) += max1363.o
  obj-$(CONFIG_MCP320X) += mcp320x.o
  obj-$(CONFIG_MCP3422) += mcp3422.o
diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
new file mode 100644
index 0000000..87ee1c7
--- /dev/null
+++ b/drivers/iio/adc/max1027.c
@@ -0,0 +1,521 @@
+ /*
+  * 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/module.h>
+#include <linux/spi/spi.h>
+#include <linux/delay.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  BIT(7)
+#define MAX1027_SETUP_REG BIT(6)
+#define MAX1027_AVG_REG   BIT(5)
+#define MAX1027_RST_REG   BIT(4)
+
+/* conversion register */
+#define MAX1027_TEMP      BIT(0)
+#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_16   (0x02 << 2)
+#define MAX1027_NAVG_32   (0x03 << 2)
+#define MAX1027_AVG_EN    BIT(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),    \
+        .scan_index = index + 1,                \
+        .scan_type = {                        \
+            .sign = 'u',                    \
+            .realbits = 10,                    \
+            .storagebits = 16,                \
+            .shift = 2,                    \
+            .endianness = IIO_BE,                \
+        },                            \
+    }
+
+#define MAX1027_T_CHAN                            \
+    {                                \
+        .type = IIO_TEMP,                    \
+        .channel = 0,                        \
+        .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),        \
+        .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),    \
+        .scan_index = 0,                    \
+        .scan_type = {                        \
+            .sign = 'u',                    \
+            .realbits = 12,                    \
+            .storagebits = 16,                \
+            .endianness = IIO_BE,                \
+        },                            \
+    }
+
+static const struct iio_chan_spec max1027_channels[] = {
+    MAX1027_T_CHAN,
+    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,
+    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,
+    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 const unsigned long max1027_available_scan_masks[] = {
+    0x000001ff,
+    0x00000000,
+};
+
+static const unsigned long max1029_available_scan_masks[] = {
+    0x00001fff,
+    0x00000000,
+};
+
+static const unsigned long max1031_available_scan_masks[] = {
+    0x0001ffff,
+    0x00000000,
+};
+
+struct max1027_chip_info {
+    const struct iio_chan_spec *channels;
+    unsigned int num_channels;
+    const 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 {
+    const struct max1027_chip_info    *info;
+    struct spi_device        *spi;
+    struct iio_trigger        *trig;
+    __be16                *buffer;
+    struct mutex            lock;
+
+    u8                reg ____cacheline_aligned;
+};
+
+static int max1027_read_single_value(struct iio_dev *indio_dev,
+                     struct iio_chan_spec const *chan,
+                     int *val)
+{
+    int ret;
+    struct max1027_state *st = iio_priv(indio_dev);
+
+    if (iio_buffer_enabled(indio_dev)) {
+        dev_warn(&indio_dev->dev, "trigger mode already enabled");
+        return -EBUSY;
+    }
+
+    /* Start acquisition on conversion register write */
+    st->reg = MAX1027_SETUP_REG | MAX1027_REF_MODE2 | MAX1027_CKS_MODE2;
+    ret = spi_write(st->spi, &st->reg, 1);
+    if (ret < 0) {
+        dev_err(&indio_dev->dev,
+            "Failed to configure setup register\n");
+        return ret;
+    }
+
+    /* Configure conversion register with the requested chan */
+    st->reg = MAX1027_CONV_REG | MAX1027_CHAN(chan->channel) |
+          MAX1027_NOSCAN | !!(chan->type == IIO_TEMP);
+    ret = spi_write(st->spi, &st->reg, 1);
+    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 interrupt doesn't occur every time.
+     * So we just wait 1 ms.
+     */
+    mdelay(1);
+
+    /* Read result */
+    ret = spi_read(st->spi, st->buffer, (chan->type == IIO_TEMP) ? 4 : 2);
+    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;
+    struct max1027_state *st = iio_priv(indio_dev);
+
+    mutex_lock(&st->lock);
+
+    switch (mask) {
+    case IIO_CHAN_INFO_RAW:
+        ret = max1027_read_single_value(indio_dev, chan, val);
+        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;
+    }
+
+    mutex_unlock(&st->lock);
+
+    return ret;
+}
+
+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);
+    u8 *val = (u8 *)st->buffer;
+
+    if (readval != NULL)
+        return -EINVAL;
+
+    *val = (u8)writeval;
+    return spi_write(st->spi, val, 1);
+}
+
+static int max1027_validate_trigger(struct iio_dev *indio_dev,
+                    struct iio_trigger *trig)
+{
+    struct max1027_state *st = iio_priv(indio_dev);
+
+    if (st->trig != trig)
+        return -EINVAL;
+
+    return 0;
+}
+
+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);
+    int ret;
+
+    if (state) {
+        /* Start acquisition on cnvst */
+        st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE0 |
+              MAX1027_REF_MODE2;
+        ret = spi_write(st->spi, &st->reg, 1);
+        if (ret < 0)
+            return ret;
+
+        /* Scan from 0 to max */
+        st->reg = MAX1027_CONV_REG | MAX1027_CHAN(0) |
+              MAX1027_SCAN_N_M | MAX1027_TEMP;
+        ret = spi_write(st->spi, &st->reg, 1);
+        if (ret < 0)
+            return ret;
+    } else {
+        /* Start acquisition on conversion register write */
+        st->reg = MAX1027_SETUP_REG | MAX1027_CKS_MODE2    |
+              MAX1027_REF_MODE2;
+        ret = spi_write(st->spi, &st->reg, 1);
+        if (ret < 0)
+            return ret;
+    }
+
+    return 0;
+}
+
+static int max1027_validate_device(struct iio_trigger *trig,
+                   struct iio_dev *indio_dev)
+{
+    struct iio_dev *indio = iio_trigger_get_drvdata(trig);
+
+    if (indio != indio_dev)
+        return -EINVAL;
+
+    return 0;
+}
+
+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 */
+    spi_read(st->spi, st->buffer, indio_dev->masklength * 2);
+
+    iio_push_to_buffers(indio_dev, st->buffer);
+
+    iio_trigger_notify_done(indio_dev->trig);
+
+    return IRQ_HANDLED;
+}
+
+static const struct iio_trigger_ops max1027_trigger_ops = {
+    .owner = THIS_MODULE,
+    .validate_device = &max1027_validate_device,
+    .set_trigger_state = &max1027_set_trigger_state,
+};
+
+static const struct iio_info max1027_info = {
+    .driver_module = THIS_MODULE,
+    .read_raw = &max1027_read_raw,
+    .validate_trigger = &max1027_validate_trigger,
+    .debugfs_reg_access = &max1027_debugfs_reg_access,
+};
+
+static int max1027_probe(struct spi_device *spi)
+{
+    int ret;
+    struct iio_dev *indio_dev;
+    struct max1027_state *st;
+
+    pr_debug("%s: probe(spi = 0x%p)\n", __func__, spi);
+
+    indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+    if (indio_dev == NULL) {
+        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->info = &max1027_chip_info_tbl[spi_get_device_id(spi)->driver_data];
+
+    mutex_init(&st->lock);
+
+    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;
+
+    st->buffer = devm_kmalloc(&indio_dev->dev,
+                  indio_dev->num_channels * 2,
+                  GFP_KERNEL);
+    if (st->buffer == NULL) {
+        dev_err(&indio_dev->dev, "Can't allocate bufffer\n");
+        return -ENOMEM;
+    }
+
+    ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+                     &max1027_trigger_handler, NULL);
+    if (ret < 0) {
+        dev_err(&indio_dev->dev, "Failed to setup buffer\n");
+        return ret;
+    }
+
+    st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-trigger",
+                            indio_dev->name);
+    if (st->trig == NULL) {
+        ret = -ENOMEM;
+        dev_err(&indio_dev->dev, "Failed to allocate iio trigger\n");
+        goto fail_trigger_alloc;
+    }
+
+    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);
+
+    ret = devm_request_threaded_irq(&spi->dev, spi->irq,
+                    iio_trigger_generic_data_rdy_poll,
+                    NULL,
+                    IRQF_TRIGGER_FALLING,
+                    spi->dev.driver->name, st->trig);
+    if (ret < 0) {
+        dev_err(&indio_dev->dev, "Failed to allocate IRQ.\n");
+        goto fail_dev_register;
+    }
+
+    /* Disable averaging */
+    st->reg = MAX1027_AVG_REG;
+    ret = spi_write(st->spi, &st->reg, 1);
+    if (ret < 0) {
+        dev_err(&indio_dev->dev, "Failed to configure averaging register\n");
+        goto fail_dev_register;
+    }
+
+    ret = iio_device_register(indio_dev);
+    if (ret < 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 ret;
+}
+
+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@xxxxxxxx>");
+MODULE_DESCRIPTION("MAX1027/MAX1029/MAX1031 ADC");
+MODULE_LICENSE("GPL v2");


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