iio: stx104: Move to addac subdirectory

The stx104 driver supports both ADC and DAC functionality.

Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/20220815222921.138945-1-william.gray@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

3 files changed, 0 insertions, 419 deletions

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 5a3e8d9ae26c..e3c2881ed23a 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -1037,22 +1037,6 @@ config STMPE_ADC
 	  Say yes here to build support for ST Microelectronics STMPE
 	  built-in ADC block (stmpe811).
 
-config STX104
-	tristate "Apex Embedded Systems STX104 driver"
-	depends on PC104 && X86
-	select ISA_BUS_API
-	select GPIOLIB
-	help
-	  Say yes here to build support for the Apex Embedded Systems STX104
-	  integrated analog PC/104 card.
-
-	  This driver supports the 16 channels of single-ended (8 channels of
-	  differential) analog inputs, 2 channels of analog output, 4 digital
-	  inputs, and 4 digital outputs provided by the STX104.
-
-	  The base port addresses for the devices may be configured via the base
-	  array module parameter.
-
 config SUN4I_GPADC
 	tristate "Support for the Allwinner SoCs GPADC"
 	depends on IIO
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index c1a861a978ad..ab084094263b 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -89,7 +89,6 @@ obj-$(CONFIG_RICHTEK_RTQ6056) += rtq6056.o
 obj-$(CONFIG_RZG2L_ADC) += rzg2l_adc.o
 obj-$(CONFIG_SC27XX_ADC) += sc27xx_adc.o
 obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
-obj-$(CONFIG_STX104) += stx104.o
 obj-$(CONFIG_SUN4I_GPADC) += sun4i-gpadc-iio.o
 obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
 obj-$(CONFIG_STM32_ADC) += stm32-adc.o
diff --git a/drivers/iio/adc/stx104.c b/drivers/iio/adc/stx104.c
deleted file mode 100644
index 48a91a95e597..000000000000
--- a/drivers/iio/adc/stx104.c
+++ /dev/null
@@ -1,402 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * IIO driver for the Apex Embedded Systems STX104
- * Copyright (C) 2016 William Breathitt Gray
- */
-#include <linux/bitops.h>
-#include <linux/device.h>
-#include <linux/errno.h>
-#include <linux/gpio/driver.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/types.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/isa.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/spinlock.h>
-#include <linux/types.h>
-
-#define STX104_OUT_CHAN(chan) {				\
-	.type = IIO_VOLTAGE,				\
-	.channel = chan,				\
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
-	.indexed = 1,					\
-	.output = 1					\
-}
-#define STX104_IN_CHAN(chan, diff) {					\
-	.type = IIO_VOLTAGE,						\
-	.channel = chan,						\
-	.channel2 = chan,						\
-	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_HARDWAREGAIN) |	\
-		BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE),	\
-	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),			\
-	.indexed = 1,							\
-	.differential = diff						\
-}
-
-#define STX104_NUM_OUT_CHAN 2
-
-#define STX104_EXTENT 16
-
-static unsigned int base[max_num_isa_dev(STX104_EXTENT)];
-static unsigned int num_stx104;
-module_param_hw_array(base, uint, ioport, &num_stx104, 0);
-MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses");
-
-/**
- * struct stx104_reg - device register structure
- * @ssr_ad:	Software Strobe Register and ADC Data
- * @achan:	ADC Channel
- * @dio:	Digital I/O
- * @dac:	DAC Channels
- * @cir_asr:	Clear Interrupts and ADC Status
- * @acr:	ADC Control
- * @pccr_fsh:	Pacer Clock Control and FIFO Status MSB
- * @acfg:	ADC Configuration
- */
-struct stx104_reg {
-	u16 ssr_ad;
-	u8 achan;
-	u8 dio;
-	u16 dac[2];
-	u8 cir_asr;
-	u8 acr;
-	u8 pccr_fsh;
-	u8 acfg;
-};
-
-/**
- * struct stx104_iio - IIO device private data structure
- * @chan_out_states:	channels' output states
- * @reg:		I/O address offset for the device registers
- */
-struct stx104_iio {
-	unsigned int chan_out_states[STX104_NUM_OUT_CHAN];
-	struct stx104_reg __iomem *reg;
-};
-
-/**
- * struct stx104_gpio - GPIO device private data structure
- * @chip:	instance of the gpio_chip
- * @lock:	synchronization lock to prevent I/O race conditions
- * @base:	base port address of the GPIO device
- * @out_state:	output bits state
- */
-struct stx104_gpio {
-	struct gpio_chip chip;
-	spinlock_t lock;
-	u8 __iomem *base;
-	unsigned int out_state;
-};
-
-static int stx104_read_raw(struct iio_dev *indio_dev,
-	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
-{
-	struct stx104_iio *const priv = iio_priv(indio_dev);
-	struct stx104_reg __iomem *const reg = priv->reg;
-	unsigned int adc_config;
-	int adbu;
-	int gain;
-
-	switch (mask) {
-	case IIO_CHAN_INFO_HARDWAREGAIN:
-		/* get gain configuration */
-		adc_config = ioread8(&reg->acfg);
-		gain = adc_config & 0x3;
-
-		*val = 1 << gain;
-		return IIO_VAL_INT;
-	case IIO_CHAN_INFO_RAW:
-		if (chan->output) {
-			*val = priv->chan_out_states[chan->channel];
-			return IIO_VAL_INT;
-		}
-
-		/* select ADC channel */
-		iowrite8(chan->channel | (chan->channel << 4), &reg->achan);
-
-		/* trigger ADC sample capture by writing to the 8-bit
-		 * Software Strobe Register and wait for completion
-		 */
-		iowrite8(0, &reg->ssr_ad);
-		while (ioread8(&reg->cir_asr) & BIT(7));
-
-		*val = ioread16(&reg->ssr_ad);
-		return IIO_VAL_INT;
-	case IIO_CHAN_INFO_OFFSET:
-		/* get ADC bipolar/unipolar configuration */
-		adc_config = ioread8(&reg->acfg);
-		adbu = !(adc_config & BIT(2));
-
-		*val = -32768 * adbu;
-		return IIO_VAL_INT;
-	case IIO_CHAN_INFO_SCALE:
-		/* get ADC bipolar/unipolar and gain configuration */
-		adc_config = ioread8(&reg->acfg);
-		adbu = !(adc_config & BIT(2));
-		gain = adc_config & 0x3;
-
-		*val = 5;
-		*val2 = 15 - adbu + gain;
-		return IIO_VAL_FRACTIONAL_LOG2;
-	}
-
-	return -EINVAL;
-}
-
-static int stx104_write_raw(struct iio_dev *indio_dev,
-	struct iio_chan_spec const *chan, int val, int val2, long mask)
-{
-	struct stx104_iio *const priv = iio_priv(indio_dev);
-
-	switch (mask) {
-	case IIO_CHAN_INFO_HARDWAREGAIN:
-		/* Only four gain states (x1, x2, x4, x8) */
-		switch (val) {
-		case 1:
-			iowrite8(0, &priv->reg->acfg);
-			break;
-		case 2:
-			iowrite8(1, &priv->reg->acfg);
-			break;
-		case 4:
-			iowrite8(2, &priv->reg->acfg);
-			break;
-		case 8:
-			iowrite8(3, &priv->reg->acfg);
-			break;
-		default:
-			return -EINVAL;
-		}
-
-		return 0;
-	case IIO_CHAN_INFO_RAW:
-		if (chan->output) {
-			/* DAC can only accept up to a 16-bit value */
-			if ((unsigned int)val > 65535)
-				return -EINVAL;
-
-			priv->chan_out_states[chan->channel] = val;
-			iowrite16(val, &priv->reg->dac[chan->channel]);
-
-			return 0;
-		}
-		return -EINVAL;
-	}
-
-	return -EINVAL;
-}
-
-static const struct iio_info stx104_info = {
-	.read_raw = stx104_read_raw,
-	.write_raw = stx104_write_raw
-};
-
-/* single-ended input channels configuration */
-static const struct iio_chan_spec stx104_channels_sing[] = {
-	STX104_OUT_CHAN(0), STX104_OUT_CHAN(1),
-	STX104_IN_CHAN(0, 0), STX104_IN_CHAN(1, 0), STX104_IN_CHAN(2, 0),
-	STX104_IN_CHAN(3, 0), STX104_IN_CHAN(4, 0), STX104_IN_CHAN(5, 0),
-	STX104_IN_CHAN(6, 0), STX104_IN_CHAN(7, 0), STX104_IN_CHAN(8, 0),
-	STX104_IN_CHAN(9, 0), STX104_IN_CHAN(10, 0), STX104_IN_CHAN(11, 0),
-	STX104_IN_CHAN(12, 0), STX104_IN_CHAN(13, 0), STX104_IN_CHAN(14, 0),
-	STX104_IN_CHAN(15, 0)
-};
-/* differential input channels configuration */
-static const struct iio_chan_spec stx104_channels_diff[] = {
-	STX104_OUT_CHAN(0), STX104_OUT_CHAN(1),
-	STX104_IN_CHAN(0, 1), STX104_IN_CHAN(1, 1), STX104_IN_CHAN(2, 1),
-	STX104_IN_CHAN(3, 1), STX104_IN_CHAN(4, 1), STX104_IN_CHAN(5, 1),
-	STX104_IN_CHAN(6, 1), STX104_IN_CHAN(7, 1)
-};
-
-static int stx104_gpio_get_direction(struct gpio_chip *chip,
-	unsigned int offset)
-{
-	/* GPIO 0-3 are input only, while the rest are output only */
-	if (offset < 4)
-		return 1;
-
-	return 0;
-}
-
-static int stx104_gpio_direction_input(struct gpio_chip *chip,
-	unsigned int offset)
-{
-	if (offset >= 4)
-		return -EINVAL;
-
-	return 0;
-}
-
-static int stx104_gpio_direction_output(struct gpio_chip *chip,
-	unsigned int offset, int value)
-{
-	if (offset < 4)
-		return -EINVAL;
-
-	chip->set(chip, offset, value);
-	return 0;
-}
-
-static int stx104_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-
-	if (offset >= 4)
-		return -EINVAL;
-
-	return !!(ioread8(stx104gpio->base) & BIT(offset));
-}
-
-static int stx104_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
-	unsigned long *bits)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-
-	*bits = ioread8(stx104gpio->base);
-
-	return 0;
-}
-
-static void stx104_gpio_set(struct gpio_chip *chip, unsigned int offset,
-	int value)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-	const unsigned int mask = BIT(offset) >> 4;
-	unsigned long flags;
-
-	if (offset < 4)
-		return;
-
-	spin_lock_irqsave(&stx104gpio->lock, flags);
-
-	if (value)
-		stx104gpio->out_state |= mask;
-	else
-		stx104gpio->out_state &= ~mask;
-
-	iowrite8(stx104gpio->out_state, stx104gpio->base);
-
-	spin_unlock_irqrestore(&stx104gpio->lock, flags);
-}
-
-#define STX104_NGPIO 8
-static const char *stx104_names[STX104_NGPIO] = {
-	"DIN0", "DIN1", "DIN2", "DIN3", "DOUT0", "DOUT1", "DOUT2", "DOUT3"
-};
-
-static void stx104_gpio_set_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
-	unsigned long flags;
-
-	/* verify masked GPIO are output */
-	if (!(*mask & 0xF0))
-		return;
-
-	*mask >>= 4;
-	*bits >>= 4;
-
-	spin_lock_irqsave(&stx104gpio->lock, flags);
-
-	stx104gpio->out_state &= ~*mask;
-	stx104gpio->out_state |= *mask & *bits;
-	iowrite8(stx104gpio->out_state, stx104gpio->base);
-
-	spin_unlock_irqrestore(&stx104gpio->lock, flags);
-}
-
-static int stx104_probe(struct device *dev, unsigned int id)
-{
-	struct iio_dev *indio_dev;
-	struct stx104_iio *priv;
-	struct stx104_gpio *stx104gpio;
-	int err;
-
-	indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
-	if (!indio_dev)
-		return -ENOMEM;
-
-	stx104gpio = devm_kzalloc(dev, sizeof(*stx104gpio), GFP_KERNEL);
-	if (!stx104gpio)
-		return -ENOMEM;
-
-	if (!devm_request_region(dev, base[id], STX104_EXTENT,
-		dev_name(dev))) {
-		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
-			base[id], base[id] + STX104_EXTENT);
-		return -EBUSY;
-	}
-
-	priv = iio_priv(indio_dev);
-	priv->reg = devm_ioport_map(dev, base[id], STX104_EXTENT);
-	if (!priv->reg)
-		return -ENOMEM;
-
-	indio_dev->info = &stx104_info;
-	indio_dev->modes = INDIO_DIRECT_MODE;
-
-	/* determine if differential inputs */
-	if (ioread8(&priv->reg->cir_asr) & BIT(5)) {
-		indio_dev->num_channels = ARRAY_SIZE(stx104_channels_diff);
-		indio_dev->channels = stx104_channels_diff;
-	} else {
-		indio_dev->num_channels = ARRAY_SIZE(stx104_channels_sing);
-		indio_dev->channels = stx104_channels_sing;
-	}
-
-	indio_dev->name = dev_name(dev);
-
-	/* configure device for software trigger operation */
-	iowrite8(0, &priv->reg->acr);
-
-	/* initialize gain setting to x1 */
-	iowrite8(0, &priv->reg->acfg);
-
-	/* initialize DAC output to 0V */
-	iowrite16(0, &priv->reg->dac[0]);
-	iowrite16(0, &priv->reg->dac[1]);
-
-	stx104gpio->chip.label = dev_name(dev);
-	stx104gpio->chip.parent = dev;
-	stx104gpio->chip.owner = THIS_MODULE;
-	stx104gpio->chip.base = -1;
-	stx104gpio->chip.ngpio = STX104_NGPIO;
-	stx104gpio->chip.names = stx104_names;
-	stx104gpio->chip.get_direction = stx104_gpio_get_direction;
-	stx104gpio->chip.direction_input = stx104_gpio_direction_input;
-	stx104gpio->chip.direction_output = stx104_gpio_direction_output;
-	stx104gpio->chip.get = stx104_gpio_get;
-	stx104gpio->chip.get_multiple = stx104_gpio_get_multiple;
-	stx104gpio->chip.set = stx104_gpio_set;
-	stx104gpio->chip.set_multiple = stx104_gpio_set_multiple;
-	stx104gpio->base = &priv->reg->dio;
-	stx104gpio->out_state = 0x0;
-
-	spin_lock_init(&stx104gpio->lock);
-
-	err = devm_gpiochip_add_data(dev, &stx104gpio->chip, stx104gpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
-		return err;
-	}
-
-	return devm_iio_device_register(dev, indio_dev);
-}
-
-static struct isa_driver stx104_driver = {
-	.probe = stx104_probe,
-	.driver = {
-		.name = "stx104"
-	},
-};
-
-module_isa_driver(stx104_driver, num_stx104);
-
-MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
-MODULE_DESCRIPTION("Apex Embedded Systems STX104 IIO driver");
-MODULE_LICENSE("GPL v2");