[PATCH v2 3/3] gpio: pci-idio-16: Utilize the idio-16 GPIO library

William Breathitt Gray
2022-09-18T19:54:33Z

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>
---
drivers/gpio/Kconfig | 1 +
drivers/gpio/gpio-pci-idio-16.c | 119 ++++----------------------------
2 files changed, 14 insertions(+), 106 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 48846ee476e2..8b90bff7b198 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1585,6 +1585,7 @@ 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
diff --git a/drivers/gpio/gpio-pci-idio-16.c b/drivers/gpio/gpio-pci-idio-16.c
index 71a13a394050..a86ce748384b 100644
--- a/drivers/gpio/gpio-pci-idio-16.c
+++ b/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);
--
2.37.3