change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/drivers/iio/adc/stx104.c
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@@ -15,7 +15,9 @@
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 #include <linux/kernel.h>
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 #include <linux/module.h>
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 #include <linux/moduleparam.h>
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+#include <linux/mutex.h>
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 #include <linux/spinlock.h>
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+#include <linux/types.h>
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 #define STX104_OUT_CHAN(chan) {				\
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 	.type = IIO_VOLTAGE,				\
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@@ -45,13 +47,37 @@
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 MODULE_PARM_DESC(base, "Apex Embedded Systems STX104 base addresses");
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 /**
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+ * struct stx104_reg - device register structure
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+ * @ssr_ad:	Software Strobe Register and ADC Data
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+ * @achan:	ADC Channel
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+ * @dio:	Digital I/O
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+ * @dac:	DAC Channels
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+ * @cir_asr:	Clear Interrupts and ADC Status
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+ * @acr:	ADC Control
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+ * @pccr_fsh:	Pacer Clock Control and FIFO Status MSB
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+ * @acfg:	ADC Configuration
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+ */
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+struct stx104_reg {
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+	u16 ssr_ad;
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+	u8 achan;
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+	u8 dio;
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+	u16 dac[2];
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+	u8 cir_asr;
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+	u8 acr;
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+	u8 pccr_fsh;
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+	u8 acfg;
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+};
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+
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+/**
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  * struct stx104_iio - IIO device private data structure
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+ * @lock: synchronization lock to prevent I/O race conditions
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  * @chan_out_states:	channels' output states
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- * @base:		base port address of the IIO device
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+ * @reg:		I/O address offset for the device registers
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  */
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 struct stx104_iio {
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+	struct mutex lock;
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 	unsigned int chan_out_states[STX104_NUM_OUT_CHAN];
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-	unsigned int base;
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+	struct stx104_reg __iomem *reg;
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 };
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 /**
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@@ -64,7 +90,7 @@
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 struct stx104_gpio {
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 	struct gpio_chip chip;
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 	spinlock_t lock;
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-	unsigned int base;
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+	u8 __iomem *base;
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 	unsigned int out_state;
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 };
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@@ -72,6 +98,7 @@
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 	struct iio_chan_spec const *chan, int *val, int *val2, long mask)
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 {
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 	struct stx104_iio *const priv = iio_priv(indio_dev);
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+	struct stx104_reg __iomem *const reg = priv->reg;
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 	unsigned int adc_config;
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 	int adbu;
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 	int gain;
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@@ -79,7 +106,7 @@
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 	switch (mask) {
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 	case IIO_CHAN_INFO_HARDWAREGAIN:
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 		/* get gain configuration */
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-		adc_config = inb(priv->base + 11);
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+		adc_config = ioread8(&reg->acfg);
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 		gain = adc_config & 0x3;
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 		*val = 1 << gain;
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@@ -90,25 +117,31 @@
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 			return IIO_VAL_INT;
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 		}
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+		mutex_lock(&priv->lock);
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+
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 		/* select ADC channel */
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-		outb(chan->channel | (chan->channel << 4), priv->base + 2);
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+		iowrite8(chan->channel | (chan->channel << 4), &reg->achan);
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-		/* trigger ADC sample capture and wait for completion */
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-		outb(0, priv->base);
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-		while (inb(priv->base + 8) & BIT(7));
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+		/* trigger ADC sample capture by writing to the 8-bit
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+		 * Software Strobe Register and wait for completion
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+		 */
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+		iowrite8(0, &reg->ssr_ad);
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+		while (ioread8(&reg->cir_asr) & BIT(7));
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-		*val = inw(priv->base);
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+		*val = ioread16(&reg->ssr_ad);
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+
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+		mutex_unlock(&priv->lock);
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 		return IIO_VAL_INT;
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 	case IIO_CHAN_INFO_OFFSET:
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 		/* get ADC bipolar/unipolar configuration */
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-		adc_config = inb(priv->base + 11);
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+		adc_config = ioread8(&reg->acfg);
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 		adbu = !(adc_config & BIT(2));
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 		*val = -32768 * adbu;
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 		return IIO_VAL_INT;
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 	case IIO_CHAN_INFO_SCALE:
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 		/* get ADC bipolar/unipolar and gain configuration */
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-		adc_config = inb(priv->base + 11);
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+		adc_config = ioread8(&reg->acfg);
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 		adbu = !(adc_config & BIT(2));
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 		gain = adc_config & 0x3;
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@@ -130,16 +163,16 @@
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 		/* Only four gain states (x1, x2, x4, x8) */
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 		switch (val) {
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 		case 1:
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-			outb(0, priv->base + 11);
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+			iowrite8(0, &priv->reg->acfg);
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 			break;
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 		case 2:
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-			outb(1, priv->base + 11);
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+			iowrite8(1, &priv->reg->acfg);
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 			break;
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 		case 4:
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-			outb(2, priv->base + 11);
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+			iowrite8(2, &priv->reg->acfg);
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 			break;
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 		case 8:
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-			outb(3, priv->base + 11);
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+			iowrite8(3, &priv->reg->acfg);
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 			break;
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 		default:
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 			return -EINVAL;
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@@ -152,9 +185,12 @@
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 			if ((unsigned int)val > 65535)
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 				return -EINVAL;
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-			priv->chan_out_states[chan->channel] = val;
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-			outw(val, priv->base + 4 + 2 * chan->channel);
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+			mutex_lock(&priv->lock);
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+			priv->chan_out_states[chan->channel] = val;
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+			iowrite16(val, &priv->reg->dac[chan->channel]);
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+
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+			mutex_unlock(&priv->lock);
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 			return 0;
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 		}
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 		return -EINVAL;
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@@ -222,7 +258,7 @@
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 	if (offset >= 4)
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 		return -EINVAL;
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-	return !!(inb(stx104gpio->base) & BIT(offset));
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+	return !!(ioread8(stx104gpio->base) & BIT(offset));
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 }
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 static int stx104_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
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@@ -230,7 +266,7 @@
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 {
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 	struct stx104_gpio *const stx104gpio = gpiochip_get_data(chip);
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-	*bits = inb(stx104gpio->base);
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+	*bits = ioread8(stx104gpio->base);
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 	return 0;
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 }
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@@ -252,7 +288,7 @@
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 	else
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 		stx104gpio->out_state &= ~mask;
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-	outb(stx104gpio->out_state, stx104gpio->base);
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+	iowrite8(stx104gpio->out_state, stx104gpio->base);
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 	spin_unlock_irqrestore(&stx104gpio->lock, flags);
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 }
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@@ -279,7 +315,7 @@
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 	stx104gpio->out_state &= ~*mask;
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 	stx104gpio->out_state |= *mask & *bits;
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-	outb(stx104gpio->out_state, stx104gpio->base);
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+	iowrite8(stx104gpio->out_state, stx104gpio->base);
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 	spin_unlock_irqrestore(&stx104gpio->lock, flags);
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 }
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@@ -306,11 +342,16 @@
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 		return -EBUSY;
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 	}
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+	priv = iio_priv(indio_dev);
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+	priv->reg = devm_ioport_map(dev, base[id], STX104_EXTENT);
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+	if (!priv->reg)
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+		return -ENOMEM;
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+
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 	indio_dev->info = &stx104_info;
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 	indio_dev->modes = INDIO_DIRECT_MODE;
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 	/* determine if differential inputs */
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-	if (inb(base[id] + 8) & BIT(5)) {
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+	if (ioread8(&priv->reg->cir_asr) & BIT(5)) {
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 		indio_dev->num_channels = ARRAY_SIZE(stx104_channels_diff);
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 		indio_dev->channels = stx104_channels_diff;
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 	} else {
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@@ -320,18 +361,17 @@
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 	indio_dev->name = dev_name(dev);
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-	priv = iio_priv(indio_dev);
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-	priv->base = base[id];
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+	mutex_init(&priv->lock);
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 	/* configure device for software trigger operation */
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-	outb(0, base[id] + 9);
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+	iowrite8(0, &priv->reg->acr);
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 	/* initialize gain setting to x1 */
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-	outb(0, base[id] + 11);
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+	iowrite8(0, &priv->reg->acfg);
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 	/* initialize DAC output to 0V */
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-	outw(0, base[id] + 4);
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-	outw(0, base[id] + 6);
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+	iowrite16(0, &priv->reg->dac[0]);
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+	iowrite16(0, &priv->reg->dac[1]);
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 	stx104gpio->chip.label = dev_name(dev);
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 	stx104gpio->chip.parent = dev;
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@@ -346,7 +386,7 @@
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 	stx104gpio->chip.get_multiple = stx104_gpio_get_multiple;
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 	stx104gpio->chip.set = stx104_gpio_set;
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 	stx104gpio->chip.set_multiple = stx104_gpio_set_multiple;
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-	stx104gpio->base = base[id] + 3;
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+	stx104gpio->base = &priv->reg->dio;
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 	stx104gpio->out_state = 0x0;
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 	spin_lock_init(&stx104gpio->lock);