gpio: pci-idio-16: Utilize the idio-16 GPIO library

The ACCES PCI-IDIO-16 device is part of the ACCES IDIO-16 family, so the
idio-16 GPIO library module is selected and utilized to consolidate
code.
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/Kconfig

@@ -1563,6 +1563,7 @@ config GPIO_PCH
 config GPIO_PCI_IDIO_16
 	tristate "ACCES PCI-IDIO-16 GPIO support"
 	select GPIOLIB_IRQCHIP
+	select GPIO_IDIO_16
 	help
 	  Enables GPIO support for the ACCES PCI-IDIO-16. An interrupt is
 	  generated when any of the inputs change state (low to high or high to

drivers/gpio/gpio-pci-idio-16.c

@@ -3,8 +3,7 @@
  * GPIO driver for the ACCES PCI-IDIO-16
  * Copyright (C) 2017 William Breathitt Gray
  */
-#include <linux/bitmap.h>
-#include <linux/bitops.h>
+#include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/gpio/driver.h>
@@ -16,51 +15,28 @@
 #include <linux/spinlock.h>
 #include <linux/types.h>
 
-/**
- * struct idio_16_gpio_reg - GPIO device registers structure
- * @out0_7:	Read: FET Drive Outputs 0-7
- *		Write: FET Drive Outputs 0-7
- * @in0_7:	Read: Isolated Inputs 0-7
- *		Write: Clear Interrupt
- * @irq_ctl:	Read: Enable IRQ
- *		Write: Disable IRQ
- * @filter_ctl:	Read: Activate Input Filters 0-15
- *		Write: Deactivate Input Filters 0-15
- * @out8_15:	Read: FET Drive Outputs 8-15
- *		Write: FET Drive Outputs 8-15
- * @in8_15:	Read: Isolated Inputs 8-15
- *		Write: Unused
- * @irq_status:	Read: Interrupt status
- *		Write: Unused
- */
-struct idio_16_gpio_reg {
-	u8 out0_7;
-	u8 in0_7;
-	u8 irq_ctl;
-	u8 filter_ctl;
-	u8 out8_15;
-	u8 in8_15;
-	u8 irq_status;
-};
+#include "gpio-idio-16.h"
 
 /**
  * struct idio_16_gpio - GPIO device private data structure
  * @chip:	instance of the gpio_chip
  * @lock:	synchronization lock to prevent I/O race conditions
  * @reg:	I/O address offset for the GPIO device registers
+ * @state:	ACCES IDIO-16 device state
  * @irq_mask:	I/O bits affected by interrupts
  */
 struct idio_16_gpio {
 	struct gpio_chip chip;
 	raw_spinlock_t lock;
-	struct idio_16_gpio_reg __iomem *reg;
+	struct idio_16 __iomem *reg;
+	struct idio_16_state state;
 	unsigned long irq_mask;
 };
 
 static int idio_16_gpio_get_direction(struct gpio_chip *chip,
 	unsigned int offset)
 {
-	if (offset > 15)
+	if (idio_16_get_direction(offset))
 		return GPIO_LINE_DIRECTION_IN;
 
 	return GPIO_LINE_DIRECTION_OUT;
@@ -82,43 +58,16 @@ static int idio_16_gpio_direction_output(struct gpio_chip *chip,
 static int idio_16_gpio_get(struct gpio_chip *chip, unsigned int offset)
 {
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	unsigned long mask = BIT(offset);
-
-	if (offset < 8)
-		return !!(ioread8(&idio16gpio->reg->out0_7) & mask);
-
-	if (offset < 16)
-		return !!(ioread8(&idio16gpio->reg->out8_15) & (mask >> 8));
-
-	if (offset < 24)
-		return !!(ioread8(&idio16gpio->reg->in0_7) & (mask >> 16));
 
-	return !!(ioread8(&idio16gpio->reg->in8_15) & (mask >> 24));
+	return idio_16_get(idio16gpio->reg, &idio16gpio->state, offset);
 }
 
 static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	unsigned long offset;
-	unsigned long gpio_mask;
-	void __iomem *ports[] = {
-		&idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15,
-		&idio16gpio->reg->in0_7, &idio16gpio->reg->in8_15,
-	};
-	void __iomem *port_addr;
-	unsigned long port_state;
-
-	/* clear bits array to a clean slate */
-	bitmap_zero(bits, chip->ngpio);
-
-	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
-		port_addr = ports[offset / 8];
-		port_state = ioread8(port_addr) & gpio_mask;
-
-		bitmap_set_value8(bits, port_state, offset);
-	}
 
+	idio_16_get_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);
 	return 0;
 }
 
@@ -126,61 +75,16 @@ static void idio_16_gpio_set(struct gpio_chip *chip, unsigned int offset,
 	int value)
 {
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	unsigned int mask = BIT(offset);
-	void __iomem *base;
-	unsigned long flags;
-	unsigned int out_state;
-
-	if (offset > 15)
-		return;
-
-	if (offset > 7) {
-		mask >>= 8;
-		base = &idio16gpio->reg->out8_15;
-	} else
-		base = &idio16gpio->reg->out0_7;
-
-	raw_spin_lock_irqsave(&idio16gpio->lock, flags);
 
-	if (value)
-		out_state = ioread8(base) | mask;
-	else
-		out_state = ioread8(base) & ~mask;
-
-	iowrite8(out_state, base);
-
-	raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
+	idio_16_set(idio16gpio->reg, &idio16gpio->state, offset, value);
 }
 
 static void idio_16_gpio_set_multiple(struct gpio_chip *chip,
 	unsigned long *mask, unsigned long *bits)
 {
 	struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);
-	unsigned long offset;
-	unsigned long gpio_mask;
-	void __iomem *ports[] = {
-		&idio16gpio->reg->out0_7, &idio16gpio->reg->out8_15,
-	};
-	size_t index;
-	void __iomem *port_addr;
-	unsigned long bitmask;
-	unsigned long flags;
-	unsigned long out_state;
 
-	for_each_set_clump8(offset, gpio_mask, mask, ARRAY_SIZE(ports) * 8) {
-		index = offset / 8;
-		port_addr = ports[index];
-
-		bitmask = bitmap_get_value8(bits, offset) & gpio_mask;
-
-		raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
-		out_state = ioread8(port_addr) & ~gpio_mask;
-		out_state |= bitmask;
-		iowrite8(out_state, port_addr);
-
-		raw_spin_unlock_irqrestore(&idio16gpio->lock, flags);
-	}
+	idio_16_set_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);
 }
 
 static void idio_16_irq_ack(struct irq_data *data)
@@ -335,6 +239,8 @@ static int idio_16_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	idio16gpio->chip.set = idio_16_gpio_set;
 	idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
 
+	idio_16_state_init(&idio16gpio->state);
+
 	girq = &idio16gpio->chip.irq;
 	girq->chip = &idio_16_irqchip;
 	/* This will let us handle the parent IRQ in the driver */
@@ -379,3 +285,4 @@ module_pci_driver(idio_16_driver);
 MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
 MODULE_DESCRIPTION("ACCES PCI-IDIO-16 GPIO driver");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(GPIO_IDIO_16);