Merge tag 'iio-for-3.10a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First set of IIO new drivers and cleanup for the 3.10 cycle.

New stuff

1) Add OF support for specifying mappings between iio devices and their
   in kernel consumers.
2) Driver for AD7923 (extra functionality and support for ad7904, ad7914 and
   ad7924 added later in series)
3) Driver for Exynos adc (dt suppor for phy added later in series).
4) Make iio_push_event save IRQ context - necessary if it is to be used
   within an interrupt handler.  Users of this functionality to follow.
5) For iio use the device tree node name to provide the hwmon name attribute
   if available.

Removal and moves out of staging

1) Drop the adt7410 driver from IIO now that there is a hmwon driver with
   equivalent support. This device is very much targeted at hardware
   monitoring so hwmon is a more appropriate host for the driver.
2) Move iio_hwmon driver to drivers/hwmon.

Cleanups

1) Minor cleanup in ST common library.
2) Large set of patches to break the info_mask element which previously used
odd and even bits to specify if a channel attribute was either shared across
similar channels or specific to only one.  Now we have two bitmaps, one for
those parameters that are specific to this channel and one for those shared
by all channels with the same type as this one.  This has no effect on the
userspace abi. It simplifies the core code and provides more space for new
channel parameters. It has been on the todo list for a long time!

Conflicts:
	drivers/iio/dac/ad5064.c

1 files changed, 383 insertions, 0 deletions

diff --git a/drivers/iio/adc/ad7923.c b/drivers/iio/adc/ad7923.c
new file mode 100644
index 000000000000..97fa0d3dc4aa
--- /dev/null
+++ b/drivers/iio/adc/ad7923.c
@@ -0,0 +1,383 @@
+/*
+ * AD7904/AD7914/AD7923/AD7924 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc (from AD7923 Driver)
+ * Copyright 2012 CS Systemes d'Information
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+#include <linux/regulator/consumer.h>
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#define AD7923_WRITE_CR		(1 << 11)	/* write control register */
+#define AD7923_RANGE		(1 << 1)	/* range to REFin */
+#define AD7923_CODING		(1 << 0)	/* coding is straight binary */
+#define AD7923_PM_MODE_AS	(1)		/* auto shutdown */
+#define AD7923_PM_MODE_FS	(2)		/* full shutdown */
+#define AD7923_PM_MODE_OPS	(3)		/* normal operation */
+#define AD7923_CHANNEL_0	(0)		/* analog input 0 */
+#define AD7923_CHANNEL_1	(1)		/* analog input 1 */
+#define AD7923_CHANNEL_2	(2)		/* analog input 2 */
+#define AD7923_CHANNEL_3	(3)		/* analog input 3 */
+#define AD7923_SEQUENCE_OFF	(0)		/* no sequence fonction */
+#define AD7923_SEQUENCE_PROTECT	(2)		/* no interrupt write cycle */
+#define AD7923_SEQUENCE_ON	(3)		/* continuous sequence */
+
+#define AD7923_MAX_CHAN		4
+
+#define AD7923_PM_MODE_WRITE(mode)	(mode << 4)	/* write mode */
+#define AD7923_CHANNEL_WRITE(channel)	(channel << 6)	/* write channel */
+#define AD7923_SEQUENCE_WRITE(sequence)	(((sequence & 1) << 3) \
+					+ ((sequence & 2) << 9))
+						/* write sequence fonction */
+/* left shift for CR : bit 11 transmit in first */
+#define AD7923_SHIFT_REGISTER	4
+
+/* val = value, dec = left shift, bits = number of bits of the mask */
+#define EXTRACT(val, dec, bits)		((val >> dec) & ((1 << bits) - 1))
+
+struct ad7923_state {
+	struct spi_device		*spi;
+	struct spi_transfer		ring_xfer[5];
+	struct spi_transfer		scan_single_xfer[2];
+	struct spi_message		ring_msg;
+	struct spi_message		scan_single_msg;
+
+	struct regulator		*reg;
+
+	unsigned int			settings;
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	__be16				rx_buf[4] ____cacheline_aligned;
+	__be16				tx_buf[4];
+};
+
+struct ad7923_chip_info {
+	const struct iio_chan_spec *channels;
+	unsigned int num_channels;
+};
+
+enum ad7923_id {
+	AD7904,
+	AD7914,
+	AD7924,
+};
+
+#define AD7923_V_CHAN(index, bits)					\
+	{								\
+		.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,					\
+		.scan_type = {						\
+			.sign = 'u',					\
+			.realbits = (bits),				\
+			.storagebits = 16,				\
+			.endianness = IIO_BE,				\
+		},							\
+	}
+
+#define DECLARE_AD7923_CHANNELS(name, bits) \
+const struct iio_chan_spec name ## _channels[] = { \
+	AD7923_V_CHAN(0, bits), \
+	AD7923_V_CHAN(1, bits), \
+	AD7923_V_CHAN(2, bits), \
+	AD7923_V_CHAN(3, bits), \
+	IIO_CHAN_SOFT_TIMESTAMP(4), \
+}
+
+static DECLARE_AD7923_CHANNELS(ad7904, 8);
+static DECLARE_AD7923_CHANNELS(ad7914, 10);
+static DECLARE_AD7923_CHANNELS(ad7924, 12);
+
+static const struct ad7923_chip_info ad7923_chip_info[] = {
+	[AD7904] = {
+		.channels = ad7904_channels,
+		.num_channels = ARRAY_SIZE(ad7904_channels),
+	},
+	[AD7914] = {
+		.channels = ad7914_channels,
+		.num_channels = ARRAY_SIZE(ad7914_channels),
+	},
+	[AD7924] = {
+		.channels = ad7924_channels,
+		.num_channels = ARRAY_SIZE(ad7924_channels),
+	},
+};
+
+/**
+ * ad7923_update_scan_mode() setup the spi transfer buffer for the new scan mask
+ **/
+static int ad7923_update_scan_mode(struct iio_dev *indio_dev,
+	const unsigned long *active_scan_mask)
+{
+	struct ad7923_state *st = iio_priv(indio_dev);
+	int i, cmd, len;
+
+	len = 0;
+	for_each_set_bit(i, active_scan_mask, AD7923_MAX_CHAN) {
+		cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(i) |
+			AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
+			st->settings;
+		cmd <<= AD7923_SHIFT_REGISTER;
+		st->tx_buf[len++] = cpu_to_be16(cmd);
+	}
+	/* build spi ring message */
+	st->ring_xfer[0].tx_buf = &st->tx_buf[0];
+	st->ring_xfer[0].len = len;
+	st->ring_xfer[0].cs_change = 1;
+
+	spi_message_init(&st->ring_msg);
+	spi_message_add_tail(&st->ring_xfer[0], &st->ring_msg);
+
+	for (i = 0; i < len; i++) {
+		st->ring_xfer[i + 1].rx_buf = &st->rx_buf[i];
+		st->ring_xfer[i + 1].len = 2;
+		st->ring_xfer[i + 1].cs_change = 1;
+		spi_message_add_tail(&st->ring_xfer[i + 1], &st->ring_msg);
+	}
+	/* make sure last transfer cs_change is not set */
+	st->ring_xfer[i + 1].cs_change = 0;
+
+	return 0;
+}
+
+/**
+ * ad7923_trigger_handler() bh of trigger launched polling to ring buffer
+ *
+ * Currently there is no option in this driver to disable the saving of
+ * timestamps within the ring.
+ **/
+static irqreturn_t ad7923_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad7923_state *st = iio_priv(indio_dev);
+	s64 time_ns = 0;
+	int b_sent;
+
+	b_sent = spi_sync(st->spi, &st->ring_msg);
+	if (b_sent)
+		goto done;
+
+	if (indio_dev->scan_timestamp) {
+		time_ns = iio_get_time_ns();
+		memcpy((u8 *)st->rx_buf + indio_dev->scan_bytes - sizeof(s64),
+			&time_ns, sizeof(time_ns));
+	}
+
+	iio_push_to_buffers(indio_dev, (u8 *)st->rx_buf);
+
+done:
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int ad7923_scan_direct(struct ad7923_state *st, unsigned ch)
+{
+	int ret, cmd;
+
+	cmd = AD7923_WRITE_CR | AD7923_CHANNEL_WRITE(ch) |
+		AD7923_SEQUENCE_WRITE(AD7923_SEQUENCE_OFF) |
+		st->settings;
+	cmd <<= AD7923_SHIFT_REGISTER;
+	st->tx_buf[0] = cpu_to_be16(cmd);
+
+	ret = spi_sync(st->spi, &st->scan_single_msg);
+	if (ret)
+		return ret;
+
+	return be16_to_cpu(st->rx_buf[0]);
+}
+
+static int ad7923_get_range(struct ad7923_state *st)
+{
+	int vref;
+
+	vref = regulator_get_voltage(st->reg);
+	if (vref < 0)
+		return vref;
+
+	vref /= 1000;
+
+	if (!(st->settings & AD7923_RANGE))
+		vref *= 2;
+
+	return vref;
+}
+
+static int ad7923_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long m)
+{
+	int ret;
+	struct ad7923_state *st = iio_priv(indio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&indio_dev->mlock);
+		if (iio_buffer_enabled(indio_dev))
+			ret = -EBUSY;
+		else
+			ret = ad7923_scan_direct(st, chan->address);
+		mutex_unlock(&indio_dev->mlock);
+
+		if (ret < 0)
+			return ret;
+
+		if (chan->address == EXTRACT(ret, 12, 4))
+			*val = EXTRACT(ret, 0, 12);
+		else
+			return -EIO;
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		ret = ad7923_get_range(st);
+		if (ret < 0)
+			return ret;
+		*val = ret;
+		*val2 = chan->scan_type.realbits;
+		return IIO_VAL_FRACTIONAL_LOG2;
+	}
+	return -EINVAL;
+}
+
+static const struct iio_info ad7923_info = {
+	.read_raw = &ad7923_read_raw,
+	.update_scan_mode = ad7923_update_scan_mode,
+	.driver_module = THIS_MODULE,
+};
+
+static int ad7923_probe(struct spi_device *spi)
+{
+	struct ad7923_state *st;
+	struct iio_dev *indio_dev = iio_device_alloc(sizeof(*st));
+	const struct ad7923_chip_info *info;
+	int ret;
+
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+
+	spi_set_drvdata(spi, indio_dev);
+
+	st->spi = spi;
+	st->settings = AD7923_CODING | AD7923_RANGE |
+			AD7923_PM_MODE_WRITE(AD7923_PM_MODE_OPS);
+
+	info = &ad7923_chip_info[spi_get_device_id(spi)->driver_data];
+
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = info->channels;
+	indio_dev->num_channels = info->num_channels;
+	indio_dev->info = &ad7923_info;
+
+	/* Setup default message */
+
+	st->scan_single_xfer[0].tx_buf = &st->tx_buf[0];
+	st->scan_single_xfer[0].len = 2;
+	st->scan_single_xfer[0].cs_change = 1;
+	st->scan_single_xfer[1].rx_buf = &st->rx_buf[0];
+	st->scan_single_xfer[1].len = 2;
+
+	spi_message_init(&st->scan_single_msg);
+	spi_message_add_tail(&st->scan_single_xfer[0], &st->scan_single_msg);
+	spi_message_add_tail(&st->scan_single_xfer[1], &st->scan_single_msg);
+
+	st->reg = regulator_get(&spi->dev, "refin");
+	if (IS_ERR(st->reg)) {
+		ret = PTR_ERR(st->reg);
+		goto error_free;
+	}
+	ret = regulator_enable(st->reg);
+	if (ret)
+		goto error_put_reg;
+
+	ret = iio_triggered_buffer_setup(indio_dev, NULL,
+			&ad7923_trigger_handler, NULL);
+	if (ret)
+		goto error_disable_reg;
+
+	ret = iio_device_register(indio_dev);
+	if (ret)
+		goto error_cleanup_ring;
+
+	return 0;
+
+error_cleanup_ring:
+	iio_triggered_buffer_cleanup(indio_dev);
+error_disable_reg:
+	regulator_disable(st->reg);
+error_put_reg:
+	regulator_put(st->reg);
+error_free:
+	iio_device_free(indio_dev);
+
+	return ret;
+}
+
+static int ad7923_remove(struct spi_device *spi)
+{
+	struct iio_dev *indio_dev = spi_get_drvdata(spi);
+	struct ad7923_state *st = iio_priv(indio_dev);
+
+	iio_device_unregister(indio_dev);
+	iio_triggered_buffer_cleanup(indio_dev);
+	regulator_disable(st->reg);
+	regulator_put(st->reg);
+	iio_device_free(indio_dev);
+
+	return 0;
+}
+
+static const struct spi_device_id ad7923_id[] = {
+	{"ad7904", AD7904},
+	{"ad7914", AD7914},
+	{"ad7923", AD7924},
+	{"ad7924", AD7924},
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ad7923_id);
+
+static struct spi_driver ad7923_driver = {
+	.driver = {
+		.name	= "ad7923",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= ad7923_probe,
+	.remove		= ad7923_remove,
+	.id_table	= ad7923_id,
+};
+module_spi_driver(ad7923_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_AUTHOR("Patrick Vasseur <patrick.vasseur@c-s.fr>");
+MODULE_DESCRIPTION("Analog Devices AD7904/AD7914/AD7923/AD7924 ADC");
+MODULE_LICENSE("GPL v2");