Move the iio driver for the ad2s1200 resolver-to-digital
converter out of staging, into mainline iio subsystems.
Signed-off-by: David Veenstra <davidjulianveens...@gmail.com>
---
Changes in v2:
- Added commit message.
- Also move device tree binding documentation out of staging.
- Disabled move detection.
.../devicetree/bindings/iio/resolver/ad2s1200.txt | 16 ++
.../bindings/staging/iio/resolver/ad2s1200.txt | 16 --
drivers/iio/Kconfig | 1 +
drivers/iio/Makefile | 1 +
drivers/iio/resolver/Kconfig | 17 ++
drivers/iio/resolver/Makefile | 5 +
drivers/iio/resolver/ad2s1200.c | 250 +++++++++++++++++++++
drivers/staging/iio/resolver/Kconfig | 12 -
drivers/staging/iio/resolver/Makefile | 1 -
drivers/staging/iio/resolver/ad2s1200.c | 250 ---------------------
10 files changed, 290 insertions(+), 279 deletions(-)
create mode 100644 Documentation/devicetree/bindings/iio/resolver/ad2s1200.txt
delete mode 100644
Documentation/devicetree/bindings/staging/iio/resolver/ad2s1200.txt
create mode 100644 drivers/iio/resolver/Kconfig
create mode 100644 drivers/iio/resolver/Makefile
create mode 100644 drivers/iio/resolver/ad2s1200.c
delete mode 100644 drivers/staging/iio/resolver/ad2s1200.c
diff --git a/Documentation/devicetree/bindings/iio/resolver/ad2s1200.txt
b/Documentation/devicetree/bindings/iio/resolver/ad2s1200.txt
new file mode 100644
index 000000000000..85c009987878
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/resolver/ad2s1200.txt
@@ -0,0 +1,16 @@
+Analog Devices AD2S1200 Resolver-to-Digital Converter
+
+Required properties:
+ - compatible : should be "adi,ad2s1200"
+ - reg : the SPI chip select number of the device
+ - sample-gpios : The GPIO pin connected to the SAMPLE line of the AD2S1200
+ - rdvel-gpios : The GPIO pin connected to the RDVEL line of the AD2S1200
+
+Example:
+
+ resolver {
+ compatible = "adi,ad2s1200";
+ reg = <4>;
+ sample-gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
+ rdvel-gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
+ };
diff --git
a/Documentation/devicetree/bindings/staging/iio/resolver/ad2s1200.txt
b/Documentation/devicetree/bindings/staging/iio/resolver/ad2s1200.txt
deleted file mode 100644
index 85c009987878..000000000000
--- a/Documentation/devicetree/bindings/staging/iio/resolver/ad2s1200.txt
+++ /dev/null
@@ -1,16 +0,0 @@
-Analog Devices AD2S1200 Resolver-to-Digital Converter
-
-Required properties:
- - compatible : should be "adi,ad2s1200"
- - reg : the SPI chip select number of the device
- - sample-gpios : The GPIO pin connected to the SAMPLE line of the AD2S1200
- - rdvel-gpios : The GPIO pin connected to the RDVEL line of the AD2S1200
-
-Example:
-
- resolver {
- compatible = "adi,ad2s1200";
- reg = <4>;
- sample-gpios = <&gpio 5 GPIO_ACTIVE_HIGH>;
- rdvel-gpios = <&gpio 6 GPIO_ACTIVE_HIGH>;
- };
diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
index b3c8c6ef0dff..4bec3ccbf4a1 100644
--- a/drivers/iio/Kconfig
+++ b/drivers/iio/Kconfig
@@ -92,6 +92,7 @@ source "drivers/iio/potentiometer/Kconfig"
source "drivers/iio/potentiostat/Kconfig"
source "drivers/iio/pressure/Kconfig"
source "drivers/iio/proximity/Kconfig"
+source "drivers/iio/resolver/Kconfig"
source "drivers/iio/temperature/Kconfig"
endif # IIO
diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
index b16b2e9ddc40..1865361b8714 100644
--- a/drivers/iio/Makefile
+++ b/drivers/iio/Makefile
@@ -35,5 +35,6 @@ obj-y += potentiometer/
obj-y += potentiostat/
obj-y += pressure/
obj-y += proximity/
+obj-y += resolver/
obj-y += temperature/
obj-y += trigger/
diff --git a/drivers/iio/resolver/Kconfig b/drivers/iio/resolver/Kconfig
new file mode 100644
index 000000000000..2ced9f22aa70
--- /dev/null
+++ b/drivers/iio/resolver/Kconfig
@@ -0,0 +1,17 @@
+#
+# Resolver/Synchro drivers
+#
+menu "Resolver to digital converters"
+
+config AD2S1200
+ tristate "Analog Devices ad2s1200/ad2s1205 driver"
+ depends on SPI
+ depends on GPIOLIB || COMPILE_TEST
+ help
+ Say yes here to build support for Analog Devices spi resolver
+ to digital converters, ad2s1200 and ad2s1205, provides direct access
+ via sysfs.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ad2s1200.
+endmenu
diff --git a/drivers/iio/resolver/Makefile b/drivers/iio/resolver/Makefile
new file mode 100644
index 000000000000..4e1dccae07e7
--- /dev/null
+++ b/drivers/iio/resolver/Makefile
@@ -0,0 +1,5 @@
+#
+# Makefile for Resolver/Synchro drivers
+#
+
+obj-$(CONFIG_AD2S1200) += ad2s1200.o
diff --git a/drivers/iio/resolver/ad2s1200.c b/drivers/iio/resolver/ad2s1200.c
new file mode 100644
index 000000000000..4f5dd28b174a
--- /dev/null
+++ b/drivers/iio/resolver/ad2s1200.c
@@ -0,0 +1,250 @@
+/*
+ * ad2s1200.c simple support for the ADI Resolver to Digital Converters:
+ * AD2S1200/1205
+ *
+ * Copyright (c) 2010-2010 Analog Devices Inc.
+ *
+ * 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.
+ *
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/spi/spi.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define DRV_NAME "ad2s1200"
+
+/* input pin sample and rdvel is controlled by driver */
+#define AD2S1200_PN 2
+
+/* input clock on serial interface */
+#define AD2S1200_HZ 8192000
+/* clock period in nano second */
+#define AD2S1200_TSCLK (1000000000 / AD2S1200_HZ)
+
+/**
+ * struct ad2s1200_state - driver instance specific data
+ * @lock: protect driver state
+ * @sdev: spi device
+ * @sample: GPIO pin SAMPLE
+ * @rdvel: GPIO pin RDVEL
+ * @rx: buffer for spi transfers
+ */
+struct ad2s1200_state {
+ struct mutex lock;
+ struct spi_device *sdev;
+ struct gpio_desc *sample;
+ struct gpio_desc *rdvel;
+ u8 rx[2] ____cacheline_aligned;
+};
+
+static int ad2s1200_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val,
+ int *val2,
+ long m)
+{
+ struct ad2s1200_state *st = iio_priv(indio_dev);
+ int ret = 0;
+ u16 vel;
+
+ /*
+ * Below a fractional approximation of Pi is needed.
+ * The following approximation will be used: 103993 / 33102.
+ * This is accurate in 9 decimals places.
+ *
+ * This fraction is based on OEIS series of nominator/denominator
+ * of convergents to Pi (A002485 and A002486).
+ */
+ switch (m) {
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_ANGL:
+ /*
+ * 2 * Pi / (2^12 - 1) ~= 2 * 103993 / (33102 * 0xFFF)
+ *
+ * Since there only fit 3 whole radians in 360 degrees,
+ * usage of iio_convert_raw_to_processed for this
+ * channel will be highly inaccurate.
+ */
+ *val = 103993;
+ *val2 = 16551 * 0xFFF;
+ return IIO_VAL_FRACTIONAL;
+ case IIO_ANGL_VEL:
+ /*
+ * 2 * Pi ~= 2 * 103993 / 33102
+ *
+ * iio_convert_raw_to_processed uses integer
+ * division. This will cause at most 5% error
+ * (for very small values). But for 99.5% of the values
+ * it will cause less that 1% error.
+ */
+ *val = 103993;
+ *val2 = 16551;
+ return IIO_VAL_FRACTIONAL;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&st->lock);
+ gpiod_set_value(st->sample, 0);
+
+ /* delay (6 * AD2S1200_TSCLK + 20) nano seconds */
+ udelay(1);
+ gpiod_set_value(st->sample, 1);
+ gpiod_set_value(st->rdvel, !!(chan->type == IIO_ANGL));
+
+ ret = spi_read(st->sdev, st->rx, 2);
+ if (ret < 0) {
+ mutex_unlock(&st->lock);
+ return ret;
+ }
+
+ vel = be16_to_cpup((__be16 *)st->rx);
+ switch (chan->type) {
+ case IIO_ANGL:
+ *val = vel >> 4;
+ break;
+ case IIO_ANGL_VEL:
+ *val = sign_extend32((s16)vel >> 4, 11);
+ break;
+ default:
+ mutex_unlock(&st->lock);
+ return -EINVAL;
+ }
+
+ /* delay (2 * AD2S1200_TSCLK + 20) ns for sample pulse */
+ udelay(1);
+ mutex_unlock(&st->lock);
+
+ return IIO_VAL_INT;
+ default:
+ break;
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_chan_spec ad2s1200_channels[] = {
+ {
+ .type = IIO_ANGL,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ }, {
+ .type = IIO_ANGL_VEL,
+ .indexed = 1,
+ .channel = 0,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+ }
+};
+
+static const struct iio_info ad2s1200_info = {
+ .read_raw = ad2s1200_read_raw,
+};
+
+static int ad2s1200_probe(struct spi_device *spi)
+{
+ unsigned short *pins = spi->dev.platform_data;
+ struct ad2s1200_state *st;
+ struct iio_dev *indio_dev;
+ struct device *dev;
+ int pn, ret = 0;
+
+ dev = &spi->dev;
+
+ if (pins) {
+ for (pn = 0; pn < AD2S1200_PN; pn++) {
+ ret = devm_gpio_request_one(dev, pins[pn],
+ GPIOF_DIR_OUT,
+ DRV_NAME);
+ if (ret) {
+ dev_err(dev,
+ "Failed to claim gpio %d\n: err=%d",
+ pins[pn],
+ ret);
+ return ret;
+ }
+ }
+ }
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, indio_dev);
+ st = iio_priv(indio_dev);
+ mutex_init(&st->lock);
+ st->sdev = spi;
+
+ if (pins) {
+ st->sample = gpio_to_desc(pins[0]);
+ st->rdvel = gpio_to_desc(pins[1]);
+ } else {
+ st->sample = devm_gpiod_get(dev, "sample", GPIOD_OUT_LOW);
+ if (IS_ERR(st->sample)) {
+ dev_err(dev, "Failed to claim SAMPLE gpio: err=%ld\n",
+ PTR_ERR(st->sample));
+ return PTR_ERR(st->sample);
+ }
+
+ st->rdvel = devm_gpiod_get(dev, "rdvel", GPIOD_OUT_LOW);
+ if (IS_ERR(st->rdvel)) {
+ dev_err(dev, "Failed to claim RDVEL gpio: err=%ld\n",
+ PTR_ERR(st->rdvel));
+ return PTR_ERR(st->rdvel);
+ }
+ }
+
+ indio_dev->dev.parent = dev;
+ indio_dev->info = &ad2s1200_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = ad2s1200_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ad2s1200_channels);
+ indio_dev->name = spi_get_device_id(spi)->name;
+
+ ret = devm_iio_device_register(dev, indio_dev);
+ if (ret)
+ return ret;
+
+ spi->max_speed_hz = AD2S1200_HZ;
+ spi->mode = SPI_MODE_3;
+ spi_setup(spi);
+
+ return 0;
+}
+
+static const struct spi_device_id ad2s1200_id[] = {
+ { "ad2s1200" },
+ { "ad2s1205" },
+ {}
+};
+MODULE_DEVICE_TABLE(spi, ad2s1200_id);
+
+static struct spi_driver ad2s1200_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = ad2s1200_probe,
+ .id_table = ad2s1200_id,
+};
+module_spi_driver(ad2s1200_driver);
+
+MODULE_AUTHOR("Graff Yang <graff.y...@gmail.com>");
+MODULE_DESCRIPTION("Analog Devices AD2S1200/1205 Resolver to Digital SPI
driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/resolver/Kconfig
b/drivers/staging/iio/resolver/Kconfig
index 1c7e2860d6b7..6a469ee6101f 100644
--- a/drivers/staging/iio/resolver/Kconfig
+++ b/drivers/staging/iio/resolver/Kconfig
@@ -13,18 +13,6 @@ config AD2S90
To compile this driver as a module, choose M here: the
module will be called ad2s90.
-config AD2S1200
- tristate "Analog Devices ad2s1200/ad2s1205 driver"
- depends on SPI
- depends on GPIOLIB || COMPILE_TEST
- help
- Say yes here to build support for Analog Devices spi resolver
- to digital converters, ad2s1200 and ad2s1205, provides direct access
- via sysfs.
-
- To compile this driver as a module, choose M here: the
- module will be called ad2s1200.
-
config AD2S1210
tristate "Analog Devices ad2s1210 driver"
depends on SPI
diff --git a/drivers/staging/iio/resolver/Makefile
b/drivers/staging/iio/resolver/Makefile
index 14375e444ebf..8d901dc7500b 100644
--- a/drivers/staging/iio/resolver/Makefile
+++ b/drivers/staging/iio/resolver/Makefile
@@ -3,5 +3,4 @@
#
obj-$(CONFIG_AD2S90) += ad2s90.o
-obj-$(CONFIG_AD2S1200) += ad2s1200.o
obj-$(CONFIG_AD2S1210) += ad2s1210.o
diff --git a/drivers/staging/iio/resolver/ad2s1200.c
b/drivers/staging/iio/resolver/ad2s1200.c
deleted file mode 100644
index 4f5dd28b174a..000000000000
--- a/drivers/staging/iio/resolver/ad2s1200.c
+++ /dev/null
@@ -1,250 +0,0 @@
-/*
- * ad2s1200.c simple support for the ADI Resolver to Digital Converters:
- * AD2S1200/1205
- *
- * Copyright (c) 2010-2010 Analog Devices Inc.
- *
- * 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.
- *
- */
-
-#include <linux/bitops.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/gpio.h>
-#include <linux/gpio/consumer.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/spi/spi.h>
-#include <linux/sysfs.h>
-#include <linux/types.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-
-#define DRV_NAME "ad2s1200"
-
-/* input pin sample and rdvel is controlled by driver */
-#define AD2S1200_PN 2
-
-/* input clock on serial interface */
-#define AD2S1200_HZ 8192000
-/* clock period in nano second */
-#define AD2S1200_TSCLK (1000000000 / AD2S1200_HZ)
-
-/**
- * struct ad2s1200_state - driver instance specific data
- * @lock: protect driver state
- * @sdev: spi device
- * @sample: GPIO pin SAMPLE
- * @rdvel: GPIO pin RDVEL
- * @rx: buffer for spi transfers
- */
-struct ad2s1200_state {
- struct mutex lock;
- struct spi_device *sdev;
- struct gpio_desc *sample;
- struct gpio_desc *rdvel;
- u8 rx[2] ____cacheline_aligned;
-};
-
-static int ad2s1200_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- struct ad2s1200_state *st = iio_priv(indio_dev);
- int ret = 0;
- u16 vel;
-
- /*
- * Below a fractional approximation of Pi is needed.
- * The following approximation will be used: 103993 / 33102.
- * This is accurate in 9 decimals places.
- *
- * This fraction is based on OEIS series of nominator/denominator
- * of convergents to Pi (A002485 and A002486).
- */
- switch (m) {
- case IIO_CHAN_INFO_SCALE:
- switch (chan->type) {
- case IIO_ANGL:
- /*
- * 2 * Pi / (2^12 - 1) ~= 2 * 103993 / (33102 * 0xFFF)
- *
- * Since there only fit 3 whole radians in 360 degrees,
- * usage of iio_convert_raw_to_processed for this
- * channel will be highly inaccurate.
- */
- *val = 103993;
- *val2 = 16551 * 0xFFF;
- return IIO_VAL_FRACTIONAL;
- case IIO_ANGL_VEL:
- /*
- * 2 * Pi ~= 2 * 103993 / 33102
- *
- * iio_convert_raw_to_processed uses integer
- * division. This will cause at most 5% error
- * (for very small values). But for 99.5% of the values
- * it will cause less that 1% error.
- */
- *val = 103993;
- *val2 = 16551;
- return IIO_VAL_FRACTIONAL;
- default:
- return -EINVAL;
- }
- break;
- case IIO_CHAN_INFO_RAW:
- mutex_lock(&st->lock);
- gpiod_set_value(st->sample, 0);
-
- /* delay (6 * AD2S1200_TSCLK + 20) nano seconds */
- udelay(1);
- gpiod_set_value(st->sample, 1);
- gpiod_set_value(st->rdvel, !!(chan->type == IIO_ANGL));
-
- ret = spi_read(st->sdev, st->rx, 2);
- if (ret < 0) {
- mutex_unlock(&st->lock);
- return ret;
- }
-
- vel = be16_to_cpup((__be16 *)st->rx);
- switch (chan->type) {
- case IIO_ANGL:
- *val = vel >> 4;
- break;
- case IIO_ANGL_VEL:
- *val = sign_extend32((s16)vel >> 4, 11);
- break;
- default:
- mutex_unlock(&st->lock);
- return -EINVAL;
- }
-
- /* delay (2 * AD2S1200_TSCLK + 20) ns for sample pulse */
- udelay(1);
- mutex_unlock(&st->lock);
-
- return IIO_VAL_INT;
- default:
- break;
- }
-
- return -EINVAL;
-}
-
-static const struct iio_chan_spec ad2s1200_channels[] = {
- {
- .type = IIO_ANGL,
- .indexed = 1,
- .channel = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
- }, {
- .type = IIO_ANGL_VEL,
- .indexed = 1,
- .channel = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
- }
-};
-
-static const struct iio_info ad2s1200_info = {
- .read_raw = ad2s1200_read_raw,
-};
-
-static int ad2s1200_probe(struct spi_device *spi)
-{
- unsigned short *pins = spi->dev.platform_data;
- struct ad2s1200_state *st;
- struct iio_dev *indio_dev;
- struct device *dev;
- int pn, ret = 0;
-
- dev = &spi->dev;
-
- if (pins) {
- for (pn = 0; pn < AD2S1200_PN; pn++) {
- ret = devm_gpio_request_one(dev, pins[pn],
- GPIOF_DIR_OUT,
- DRV_NAME);
- if (ret) {
- dev_err(dev,
- "Failed to claim gpio %d\n: err=%d",
- pins[pn],
- ret);
- return ret;
- }
- }
- }
-
- indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
- if (!indio_dev)
- return -ENOMEM;
-
- spi_set_drvdata(spi, indio_dev);
- st = iio_priv(indio_dev);
- mutex_init(&st->lock);
- st->sdev = spi;
-
- if (pins) {
- st->sample = gpio_to_desc(pins[0]);
- st->rdvel = gpio_to_desc(pins[1]);
- } else {
- st->sample = devm_gpiod_get(dev, "sample", GPIOD_OUT_LOW);
- if (IS_ERR(st->sample)) {
- dev_err(dev, "Failed to claim SAMPLE gpio: err=%ld\n",
- PTR_ERR(st->sample));
- return PTR_ERR(st->sample);
- }
-
- st->rdvel = devm_gpiod_get(dev, "rdvel", GPIOD_OUT_LOW);
- if (IS_ERR(st->rdvel)) {
- dev_err(dev, "Failed to claim RDVEL gpio: err=%ld\n",
- PTR_ERR(st->rdvel));
- return PTR_ERR(st->rdvel);
- }
- }
-
- indio_dev->dev.parent = dev;
- indio_dev->info = &ad2s1200_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = ad2s1200_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad2s1200_channels);
- indio_dev->name = spi_get_device_id(spi)->name;
-
- ret = devm_iio_device_register(dev, indio_dev);
- if (ret)
- return ret;
-
- spi->max_speed_hz = AD2S1200_HZ;
- spi->mode = SPI_MODE_3;
- spi_setup(spi);
-
- return 0;
-}
-
-static const struct spi_device_id ad2s1200_id[] = {
- { "ad2s1200" },
- { "ad2s1205" },
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad2s1200_id);
-
-static struct spi_driver ad2s1200_driver = {
- .driver = {
- .name = DRV_NAME,
- },
- .probe = ad2s1200_probe,
- .id_table = ad2s1200_id,
-};
-module_spi_driver(ad2s1200_driver);
-
-MODULE_AUTHOR("Graff Yang <graff.y...@gmail.com>");
-MODULE_DESCRIPTION("Analog Devices AD2S1200/1205 Resolver to Digital SPI
driver");
-MODULE_LICENSE("GPL v2");
--
2.16.2
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