[PATCH 3/4] staging: iio: resolver: remove ad2s1210 driver

David Lechner
2023-09-20T17:03:33Z

This removes the AD2S1210 resolver driver from staging. It will be
improved and resubmitted out of staging.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
drivers/staging/iio/Kconfig | 1 -
drivers/staging/iio/Makefile | 1 -
drivers/staging/iio/resolver/Kconfig | 18 -
drivers/staging/iio/resolver/Makefile | 6 -
drivers/staging/iio/resolver/ad2s1210.c | 716 ------------------------
5 files changed, 742 deletions(-)
delete mode 100644 drivers/staging/iio/resolver/Kconfig
delete mode 100644 drivers/staging/iio/resolver/Makefile
delete mode 100644 drivers/staging/iio/resolver/ad2s1210.c

diff --git a/drivers/staging/iio/Kconfig b/drivers/staging/iio/Kconfig
index d3968fe2ebb8..a60631c1f449 100644
--- a/drivers/staging/iio/Kconfig
+++ b/drivers/staging/iio/Kconfig
@@ -10,6 +10,5 @@ source "drivers/staging/iio/adc/Kconfig"
source "drivers/staging/iio/addac/Kconfig"
source "drivers/staging/iio/frequency/Kconfig"
source "drivers/staging/iio/impedance-analyzer/Kconfig"
-source "drivers/staging/iio/resolver/Kconfig"

endmenu
diff --git a/drivers/staging/iio/Makefile b/drivers/staging/iio/Makefile
index c50f1019f829..628583535393 100644
--- a/drivers/staging/iio/Makefile
+++ b/drivers/staging/iio/Makefile
@@ -8,4 +8,3 @@ obj-y += adc/
obj-y += addac/
obj-y += frequency/
obj-y += impedance-analyzer/
-obj-y += resolver/
diff --git a/drivers/staging/iio/resolver/Kconfig b/drivers/staging/iio/resolver/Kconfig
deleted file mode 100644
index 6d1e2622e0b0..000000000000
--- a/drivers/staging/iio/resolver/Kconfig
+++ /dev/null
@@ -1,18 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Resolver/Synchro drivers
-#
-menu "Resolver to digital converters"
-
-config AD2S1210
- tristate "Analog Devices ad2s1210 driver"
- depends on SPI
- depends on GPIOLIB || COMPILE_TEST
- help
- Say yes here to build support for Analog Devices spi resolver
- to digital converters, ad2s1210, provides direct access via sysfs.
-
- To compile this driver as a module, choose M here: the
- module will be called ad2s1210.
-
-endmenu
diff --git a/drivers/staging/iio/resolver/Makefile b/drivers/staging/iio/resolver/Makefile
deleted file mode 100644
index 398631f7e79b..000000000000
--- a/drivers/staging/iio/resolver/Makefile
+++ /dev/null
@@ -1,6 +0,0 @@
-# SPDX-License-Identifier: GPL-2.0
-#
-# Makefile for Resolver/Synchro drivers
-#
-
-obj-$(CONFIG_AD2S1210) += ad2s1210.o
diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
deleted file mode 100644
index 06de5823eb8e..000000000000
--- a/drivers/staging/iio/resolver/ad2s1210.c
+++ /dev/null
@@ -1,716 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * ad2s1210.c support for the ADI Resolver to Digital Converters: AD2S1210
- *
- * Copyright (c) 2010-2010 Analog Devices Inc.
- */
-#include <linux/types.h>
-#include <linux/mutex.h>
-#include <linux/device.h>
-#include <linux/of.h>
-#include <linux/spi/spi.h>
-#include <linux/slab.h>
-#include <linux/sysfs.h>
-#include <linux/delay.h>
-#include <linux/gpio/consumer.h>
-#include <linux/module.h>
-
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-
-#define DRV_NAME "ad2s1210"
-
-#define AD2S1210_DEF_CONTROL 0x7E
-
-#define AD2S1210_MSB_IS_HIGH 0x80
-#define AD2S1210_MSB_IS_LOW 0x7F
-#define AD2S1210_PHASE_LOCK_RANGE_44 0x20
-#define AD2S1210_ENABLE_HYSTERESIS 0x10
-#define AD2S1210_SET_ENRES1 0x08
-#define AD2S1210_SET_ENRES0 0x04
-#define AD2S1210_SET_RES1 0x02
-#define AD2S1210_SET_RES0 0x01
-
-#define AD2S1210_SET_RESOLUTION (AD2S1210_SET_RES1 | AD2S1210_SET_RES0)
-
-#define AD2S1210_REG_POSITION 0x80
-#define AD2S1210_REG_VELOCITY 0x82
-#define AD2S1210_REG_LOS_THRD 0x88
-#define AD2S1210_REG_DOS_OVR_THRD 0x89
-#define AD2S1210_REG_DOS_MIS_THRD 0x8A
-#define AD2S1210_REG_DOS_RST_MAX_THRD 0x8B
-#define AD2S1210_REG_DOS_RST_MIN_THRD 0x8C
-#define AD2S1210_REG_LOT_HIGH_THRD 0x8D
-#define AD2S1210_REG_LOT_LOW_THRD 0x8E
-#define AD2S1210_REG_EXCIT_FREQ 0x91
-#define AD2S1210_REG_CONTROL 0x92
-#define AD2S1210_REG_SOFT_RESET 0xF0
-#define AD2S1210_REG_FAULT 0xFF
-
-#define AD2S1210_MIN_CLKIN 6144000
-#define AD2S1210_MAX_CLKIN 10240000
-#define AD2S1210_MIN_EXCIT 2000
-#define AD2S1210_MAX_EXCIT 20000
-#define AD2S1210_MIN_FCW 0x4
-#define AD2S1210_MAX_FCW 0x50
-
-#define AD2S1210_DEF_EXCIT 10000
-
-enum ad2s1210_mode {
- MOD_POS = 0,
- MOD_VEL,
- MOD_CONFIG,
- MOD_RESERVED,
-};
-
-enum ad2s1210_gpios {
- AD2S1210_SAMPLE,
- AD2S1210_A0,
- AD2S1210_A1,
- AD2S1210_RES0,
- AD2S1210_RES1,
-};
-
-struct ad2s1210_gpio {
- const char *name;
- unsigned long flags;
-};
-
-static const struct ad2s1210_gpio gpios[] = {
- [AD2S1210_SAMPLE] = { .name = "adi,sample", .flags = GPIOD_OUT_LOW },
- [AD2S1210_A0] = { .name = "adi,a0", .flags = GPIOD_OUT_LOW },
- [AD2S1210_A1] = { .name = "adi,a1", .flags = GPIOD_OUT_LOW },
- [AD2S1210_RES0] = { .name = "adi,res0", .flags = GPIOD_OUT_LOW },
- [AD2S1210_RES1] = { .name = "adi,res1", .flags = GPIOD_OUT_LOW },
-};
-
-static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
-
-struct ad2s1210_state {
- struct mutex lock;
- struct spi_device *sdev;
- struct gpio_desc *gpios[5];
- unsigned int fclkin;
- unsigned int fexcit;
- bool hysteresis;
- u8 resolution;
- enum ad2s1210_mode mode;
- u8 rx[2] __aligned(IIO_DMA_MINALIGN);
- u8 tx[2];
-};
-
-static const int ad2s1210_mode_vals[4][2] = {
- [MOD_POS] = { 0, 0 },
- [MOD_VEL] = { 0, 1 },
- [MOD_CONFIG] = { 1, 1 },
-};
-
-static inline void ad2s1210_set_mode(enum ad2s1210_mode mode,
- struct ad2s1210_state *st)
-{
- gpiod_set_value(st->gpios[AD2S1210_A0], ad2s1210_mode_vals[mode][0]);
- gpiod_set_value(st->gpios[AD2S1210_A1], ad2s1210_mode_vals[mode][1]);
- st->mode = mode;
-}
-
-/* write 1 bytes (address or data) to the chip */
-static int ad2s1210_config_write(struct ad2s1210_state *st, u8 data)
-{
- int ret;
-
- ad2s1210_set_mode(MOD_CONFIG, st);
- st->tx[0] = data;
- ret = spi_write(st->sdev, st->tx, 1);
- if (ret < 0)
- return ret;
-
- return 0;
-}
-
-/* read value from one of the registers */
-static int ad2s1210_config_read(struct ad2s1210_state *st,
- unsigned char address)
-{
- struct spi_transfer xfers[] = {
- {
- .len = 1,
- .rx_buf = &st->rx[0],
- .tx_buf = &st->tx[0],
- .cs_change = 1,
- }, {
- .len = 1,
- .rx_buf = &st->rx[1],
- .tx_buf = &st->tx[1],
- },
- };
- int ret = 0;
-
- ad2s1210_set_mode(MOD_CONFIG, st);
- st->tx[0] = address | AD2S1210_MSB_IS_HIGH;
- st->tx[1] = AD2S1210_REG_FAULT;
- ret = spi_sync_transfer(st->sdev, xfers, 2);
- if (ret < 0)
- return ret;
-
- return st->rx[1];
-}
-
-static inline
-int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st)
-{
- int ret;
- unsigned char fcw;
-
- fcw = (unsigned char)(st->fexcit * (1 << 15) / st->fclkin);
- if (fcw < AD2S1210_MIN_FCW || fcw > AD2S1210_MAX_FCW) {
- dev_err(&st->sdev->dev, "ad2s1210: FCW out of range\n");
- return -ERANGE;
- }
-
- ret = ad2s1210_config_write(st, AD2S1210_REG_EXCIT_FREQ);
- if (ret < 0)
- return ret;
-
- return ad2s1210_config_write(st, fcw);
-}
-
-static const int ad2s1210_res_pins[4][2] = {
- { 0, 0 }, {0, 1}, {1, 0}, {1, 1}
-};
-
-static inline void ad2s1210_set_resolution_pin(struct ad2s1210_state *st)
-{
- gpiod_set_value(st->gpios[AD2S1210_RES0],
- ad2s1210_res_pins[(st->resolution - 10) / 2][0]);
- gpiod_set_value(st->gpios[AD2S1210_RES1],
- ad2s1210_res_pins[(st->resolution - 10) / 2][1]);
-}
-
-static inline int ad2s1210_soft_reset(struct ad2s1210_state *st)
-{
- int ret;
-
- ret = ad2s1210_config_write(st, AD2S1210_REG_SOFT_RESET);
- if (ret < 0)
- return ret;
-
- return ad2s1210_config_write(st, 0x0);
-}
-
-static ssize_t ad2s1210_show_fclkin(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
-
- return sprintf(buf, "%u\n", st->fclkin);
-}
-
-static ssize_t ad2s1210_store_fclkin(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- unsigned int fclkin;
- int ret;
-
- ret = kstrtouint(buf, 10, &fclkin);
- if (ret)
- return ret;
- if (fclkin < AD2S1210_MIN_CLKIN || fclkin > AD2S1210_MAX_CLKIN) {
- dev_err(dev, "ad2s1210: fclkin out of range\n");
- return -EINVAL;
- }
-
- mutex_lock(&st->lock);
- st->fclkin = fclkin;
-
- ret = ad2s1210_update_frequency_control_word(st);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_soft_reset(st);
-error_ret:
- mutex_unlock(&st->lock);
-
- return ret < 0 ? ret : len;
-}
-
-static ssize_t ad2s1210_show_fexcit(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
-
- return sprintf(buf, "%u\n", st->fexcit);
-}
-
-static ssize_t ad2s1210_store_fexcit(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- unsigned int fexcit;
- int ret;
-
- ret = kstrtouint(buf, 10, &fexcit);
- if (ret < 0)
- return ret;
- if (fexcit < AD2S1210_MIN_EXCIT || fexcit > AD2S1210_MAX_EXCIT) {
- dev_err(dev,
- "ad2s1210: excitation frequency out of range\n");
- return -EINVAL;
- }
- mutex_lock(&st->lock);
- st->fexcit = fexcit;
- ret = ad2s1210_update_frequency_control_word(st);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_soft_reset(st);
-error_ret:
- mutex_unlock(&st->lock);
-
- return ret < 0 ? ret : len;
-}
-
-static ssize_t ad2s1210_show_control(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- int ret;
-
- mutex_lock(&st->lock);
- ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
- mutex_unlock(&st->lock);
- return ret < 0 ? ret : sprintf(buf, "0x%x\n", ret);
-}
-
-static ssize_t ad2s1210_store_control(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- unsigned char udata;
- unsigned char data;
- int ret;
-
- ret = kstrtou8(buf, 16, &udata);
- if (ret)
- return -EINVAL;
-
- mutex_lock(&st->lock);
- ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
- data = udata & AD2S1210_MSB_IS_LOW;
- ret = ad2s1210_config_write(st, data);
- if (ret < 0)
- goto error_ret;
-
- ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
- if (ret & AD2S1210_MSB_IS_HIGH) {
- ret = -EIO;
- dev_err(dev,
- "ad2s1210: write control register fail\n");
- goto error_ret;
- }
- st->resolution =
- ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
- ad2s1210_set_resolution_pin(st);
- ret = len;
- st->hysteresis = !!(data & AD2S1210_ENABLE_HYSTERESIS);
-
-error_ret:
- mutex_unlock(&st->lock);
- return ret;
-}
-
-static ssize_t ad2s1210_show_resolution(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
-
- return sprintf(buf, "%d\n", st->resolution);
-}
-
-static ssize_t ad2s1210_store_resolution(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- unsigned char data;
- unsigned char udata;
- int ret;
-
- ret = kstrtou8(buf, 10, &udata);
- if (ret || udata < 10 || udata > 16) {
- dev_err(dev, "ad2s1210: resolution out of range\n");
- return -EINVAL;
- }
- mutex_lock(&st->lock);
- ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
- data = ret;
- data &= ~AD2S1210_SET_RESOLUTION;
- data |= (udata - 10) >> 1;
- ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_config_write(st, data & AD2S1210_MSB_IS_LOW);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
- data = ret;
- if (data & AD2S1210_MSB_IS_HIGH) {
- ret = -EIO;
- dev_err(dev, "ad2s1210: setting resolution fail\n");
- goto error_ret;
- }
- st->resolution =
- ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
- ad2s1210_set_resolution_pin(st);
- ret = len;
-error_ret:
- mutex_unlock(&st->lock);
- return ret;
-}
-
-/* read the fault register since last sample */
-static ssize_t ad2s1210_show_fault(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- int ret;
-
- mutex_lock(&st->lock);
- ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
- mutex_unlock(&st->lock);
-
- return ret ? ret : sprintf(buf, "0x%x\n", ret);
-}
-
-static ssize_t ad2s1210_clear_fault(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t len)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- int ret;
-
- mutex_lock(&st->lock);
- gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
- /* delay (2 * tck + 20) nano seconds */
- udelay(1);
- gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
- ret = ad2s1210_config_read(st, AD2S1210_REG_FAULT);
- if (ret < 0)
- goto error_ret;
- gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
- gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
-error_ret:
- mutex_unlock(&st->lock);
-
- return ret < 0 ? ret : len;
-}
-
-static ssize_t ad2s1210_show_reg(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- struct iio_dev_attr *iattr = to_iio_dev_attr(attr);
- int ret;
-
- mutex_lock(&st->lock);
- ret = ad2s1210_config_read(st, iattr->address);
- mutex_unlock(&st->lock);
-
- return ret < 0 ? ret : sprintf(buf, "%d\n", ret);
-}
-
-static ssize_t ad2s1210_store_reg(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t len)
-{
- struct ad2s1210_state *st = iio_priv(dev_to_iio_dev(dev));
- unsigned char data;
- int ret;
- struct iio_dev_attr *iattr = to_iio_dev_attr(attr);
-
- ret = kstrtou8(buf, 10, &data);
- if (ret)
- return -EINVAL;
- mutex_lock(&st->lock);
- ret = ad2s1210_config_write(st, iattr->address);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_config_write(st, data & AD2S1210_MSB_IS_LOW);
-error_ret:
- mutex_unlock(&st->lock);
- return ret < 0 ? ret : len;
-}
-
-static int ad2s1210_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val,
- int *val2,
- long m)
-{
- struct ad2s1210_state *st = iio_priv(indio_dev);
- u16 negative;
- int ret = 0;
- u16 pos;
- s16 vel;
-
- mutex_lock(&st->lock);
- gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 0);
- /* delay (6 * tck + 20) nano seconds */
- udelay(1);
-
- switch (chan->type) {
- case IIO_ANGL:
- ad2s1210_set_mode(MOD_POS, st);
- break;
- case IIO_ANGL_VEL:
- ad2s1210_set_mode(MOD_VEL, st);
- break;
- default:
- ret = -EINVAL;
- break;
- }
- if (ret < 0)
- goto error_ret;
- ret = spi_read(st->sdev, st->rx, 2);
- if (ret < 0)
- goto error_ret;
-
- switch (chan->type) {
- case IIO_ANGL:
- pos = be16_to_cpup((__be16 *)st->rx);
- if (st->hysteresis)
- pos >>= 16 - st->resolution;
- *val = pos;
- ret = IIO_VAL_INT;
- break;
- case IIO_ANGL_VEL:
- vel = be16_to_cpup((__be16 *)st->rx);
- vel >>= 16 - st->resolution;
- if (vel & 0x8000) {
- negative = (0xffff >> st->resolution) << st->resolution;
- vel |= negative;
- }
- *val = vel;
- ret = IIO_VAL_INT;
- break;
- default:
- mutex_unlock(&st->lock);
- return -EINVAL;
- }
-
-error_ret:
- gpiod_set_value(st->gpios[AD2S1210_SAMPLE], 1);
- /* delay (2 * tck + 20) nano seconds */
- udelay(1);
- mutex_unlock(&st->lock);
- return ret;
-}
-
-static IIO_DEVICE_ATTR(fclkin, 0644,
- ad2s1210_show_fclkin, ad2s1210_store_fclkin, 0);
-static IIO_DEVICE_ATTR(fexcit, 0644,
- ad2s1210_show_fexcit, ad2s1210_store_fexcit, 0);
-static IIO_DEVICE_ATTR(control, 0644,
- ad2s1210_show_control, ad2s1210_store_control, 0);
-static IIO_DEVICE_ATTR(bits, 0644,
- ad2s1210_show_resolution, ad2s1210_store_resolution, 0);
-static IIO_DEVICE_ATTR(fault, 0644,
- ad2s1210_show_fault, ad2s1210_clear_fault, 0);
-
-static IIO_DEVICE_ATTR(los_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_LOS_THRD);
-static IIO_DEVICE_ATTR(dos_ovr_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_DOS_OVR_THRD);
-static IIO_DEVICE_ATTR(dos_mis_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_DOS_MIS_THRD);
-static IIO_DEVICE_ATTR(dos_rst_max_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_DOS_RST_MAX_THRD);
-static IIO_DEVICE_ATTR(dos_rst_min_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_DOS_RST_MIN_THRD);
-static IIO_DEVICE_ATTR(lot_high_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_LOT_HIGH_THRD);
-static IIO_DEVICE_ATTR(lot_low_thrd, 0644,
- ad2s1210_show_reg, ad2s1210_store_reg,
- AD2S1210_REG_LOT_LOW_THRD);
-
-static const struct iio_chan_spec ad2s1210_channels[] = {
- {
- .type = IIO_ANGL,
- .indexed = 1,
- .channel = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- }, {
- .type = IIO_ANGL_VEL,
- .indexed = 1,
- .channel = 0,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- }
-};
-
-static struct attribute *ad2s1210_attributes[] = {
- &iio_dev_attr_fclkin.dev_attr.attr,
- &iio_dev_attr_fexcit.dev_attr.attr,
- &iio_dev_attr_control.dev_attr.attr,
- &iio_dev_attr_bits.dev_attr.attr,
- &iio_dev_attr_fault.dev_attr.attr,
- &iio_dev_attr_los_thrd.dev_attr.attr,
- &iio_dev_attr_dos_ovr_thrd.dev_attr.attr,
- &iio_dev_attr_dos_mis_thrd.dev_attr.attr,
- &iio_dev_attr_dos_rst_max_thrd.dev_attr.attr,
- &iio_dev_attr_dos_rst_min_thrd.dev_attr.attr,
- &iio_dev_attr_lot_high_thrd.dev_attr.attr,
- &iio_dev_attr_lot_low_thrd.dev_attr.attr,
- NULL,
-};
-
-static const struct attribute_group ad2s1210_attribute_group = {
- .attrs = ad2s1210_attributes,
-};
-
-static int ad2s1210_initial(struct ad2s1210_state *st)
-{
- unsigned char data;
- int ret;
-
- mutex_lock(&st->lock);
- ad2s1210_set_resolution_pin(st);
-
- ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
- data = AD2S1210_DEF_CONTROL & ~(AD2S1210_SET_RESOLUTION);
- data |= (st->resolution - 10) >> 1;
- ret = ad2s1210_config_write(st, data);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_config_read(st, AD2S1210_REG_CONTROL);
- if (ret < 0)
- goto error_ret;
-
- if (ret & AD2S1210_MSB_IS_HIGH) {
- ret = -EIO;
- goto error_ret;
- }
-
- ret = ad2s1210_update_frequency_control_word(st);
- if (ret < 0)
- goto error_ret;
- ret = ad2s1210_soft_reset(st);
-error_ret:
- mutex_unlock(&st->lock);
- return ret;
-}
-
-static const struct iio_info ad2s1210_info = {
- .read_raw = ad2s1210_read_raw,
- .attrs = &ad2s1210_attribute_group,
-};
-
-static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
-{
- struct spi_device *spi = st->sdev;
- int i, ret;
-
- for (i = 0; i < ARRAY_SIZE(gpios); i++) {
- st->gpios[i] = devm_gpiod_get(&spi->dev, gpios[i].name,
- gpios[i].flags);
- if (IS_ERR(st->gpios[i])) {
- ret = PTR_ERR(st->gpios[i]);
- dev_err(&spi->dev,
- "ad2s1210: failed to request %s GPIO: %d\n",
- gpios[i].name, ret);
- return ret;
- }
- }
-
- return 0;
-}
-
-static int ad2s1210_probe(struct spi_device *spi)
-{
- struct iio_dev *indio_dev;
- struct ad2s1210_state *st;
- int ret;
-
- indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
- if (!indio_dev)
- return -ENOMEM;
- st = iio_priv(indio_dev);
- ret = ad2s1210_setup_gpios(st);
- if (ret < 0)
- return ret;
-
- spi_set_drvdata(spi, indio_dev);
-
- mutex_init(&st->lock);
- st->sdev = spi;
- st->hysteresis = true;
- st->mode = MOD_CONFIG;
- st->resolution = 12;
- st->fexcit = AD2S1210_DEF_EXCIT;
-
- indio_dev->info = &ad2s1210_info;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = ad2s1210_channels;
- indio_dev->num_channels = ARRAY_SIZE(ad2s1210_channels);
- indio_dev->name = spi_get_device_id(spi)->name;
-
- ret = devm_iio_device_register(&spi->dev, indio_dev);
- if (ret)
- return ret;
-
- st->fclkin = spi->max_speed_hz;
- spi->mode = SPI_MODE_3;
- spi_setup(spi);
- ad2s1210_initial(st);
-
- return 0;
-}
-
-static const struct of_device_id ad2s1210_of_match[] = {
- { .compatible = "adi,ad2s1210", },
- { }
-};
-MODULE_DEVICE_TABLE(of, ad2s1210_of_match);
-
-static const struct spi_device_id ad2s1210_id[] = {
- { "ad2s1210" },
- {}
-};
-MODULE_DEVICE_TABLE(spi, ad2s1210_id);
-
-static struct spi_driver ad2s1210_driver = {
- .driver = {
- .name = DRV_NAME,
- .of_match_table = of_match_ptr(ad2s1210_of_match),
- },
- .probe = ad2s1210_probe,
- .id_table = ad2s1210_id,
-};
-module_spi_driver(ad2s1210_driver);
-
-MODULE_AUTHOR("Graff Yang <graff.yang@gmail.com>");
-MODULE_DESCRIPTION("Analog Devices AD2S1210 Resolver to Digital SPI driver");
-MODULE_LICENSE("GPL v2");
--
2.34.1