[PATCH v2 2/3] gpio: 104-idio-16: Utilize the idio-16 GPIO library

William Breathitt Gray
2022-09-18T19:54:27Z

The ACCES 104-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-104-idio-16.c | 88 ++++++---------------------------
2 files changed, 17 insertions(+), 72 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 551351e11365..48846ee476e2 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -866,6 +866,7 @@ config GPIO_104_IDIO_16
depends on PC104
select ISA_BUS_API
select GPIOLIB_IRQCHIP
+ select GPIO_IDIO_16
help
Enables GPIO support for the ACCES 104-IDIO-16 family (104-IDIO-16,
104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, 104-IDO-8). The
diff --git a/drivers/gpio/gpio-104-idio-16.c b/drivers/gpio/gpio-104-idio-16.c
index 73d95b55a8c5..0f4d36c09aa4 100644
--- a/drivers/gpio/gpio-104-idio-16.c
+++ b/drivers/gpio/gpio-104-idio-16.c
@@ -6,7 +6,7 @@
* This driver supports the following ACCES devices: 104-IDIO-16,
* 104-IDIO-16E, 104-IDO-16, 104-IDIO-8, 104-IDIO-8E, and 104-IDO-8.
*/
-#include <linux/bits.h>
+#include <linux/bitmap.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/gpio/driver.h>
@@ -21,6 +21,8 @@
#include <linux/spinlock.h>
#include <linux/types.h>

+#include "gpio-idio-16.h"
+
#define IDIO_16_EXTENT 8
#define MAX_NUM_IDIO_16 max_num_isa_dev(IDIO_16_EXTENT)

@@ -34,49 +36,26 @@ static unsigned int num_irq;
module_param_hw_array(irq, uint, irq, &num_irq, 0);
MODULE_PARM_DESC(irq, "ACCES 104-IDIO-16 interrupt line numbers");

-/**
- * struct idio_16_reg - device registers structure
- * @out0_7: Read: N/A
- * Write: FET Drive Outputs 0-7
- * @in0_7: Read: Isolated Inputs 0-7
- * Write: Clear Interrupt
- * @irq_ctl: Read: Enable IRQ
- * Write: Disable IRQ
- * @unused: N/A
- * @out8_15: Read: N/A
- * Write: FET Drive Outputs 8-15
- * @in8_15: Read: Isolated Inputs 8-15
- * Write: N/A
- */
-struct idio_16_reg {
- u8 out0_7;
- u8 in0_7;
- u8 irq_ctl;
- u8 unused;
- u8 out8_15;
- u8 in8_15;
-};
-
/**
* struct idio_16_gpio - GPIO device private data structure
* @chip: instance of the gpio_chip
* @lock: synchronization lock to prevent I/O race conditions
* @irq_mask: I/O bits affected by interrupts
* @reg: I/O address offset for the device registers
- * @out_state: output bits state
+ * @state: ACCES IDIO-16 device state
*/
struct idio_16_gpio {
struct gpio_chip chip;
raw_spinlock_t lock;
unsigned long irq_mask;
- struct idio_16_reg __iomem *reg;
- unsigned int out_state;
+ struct idio_16 __iomem *reg;
+ struct idio_16_state state;
};

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;
@@ -98,15 +77,8 @@ 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);
- const unsigned int mask = BIT(offset-16);

- if (offset < 16)
- return -EINVAL;
-
- if (offset < 24)
- return !!(ioread8(&idio16gpio->reg->in0_7) & mask);
-
- return !!(ioread8(&idio16gpio->reg->in8_15) & (mask>>8));
+ return idio_16_get(idio16gpio->reg, &idio16gpio->state, offset);
}

static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
@@ -114,11 +86,7 @@ static int idio_16_gpio_get_multiple(struct gpio_chip *chip,
{
struct idio_16_gpio *const idio16gpio = gpiochip_get_data(chip);

- *bits = 0;
- if (*mask & GENMASK(23, 16))
- *bits |= (unsigned long)ioread8(&idio16gpio->reg->in0_7) << 16;
- if (*mask & GENMASK(31, 24))
- *bits |= (unsigned long)ioread8(&idio16gpio->reg->in8_15) << 24;
+ idio_16_get_multiple(idio16gpio->reg, &idio16gpio->state, mask, bits);

return 0;
}
@@ -127,44 +95,16 @@ 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);
- const unsigned int mask = BIT(offset);
- unsigned long flags;

- if (offset > 15)
- return;
-
- raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
- if (value)
- idio16gpio->out_state |= mask;
- else
- idio16gpio->out_state &= ~mask;
-
- if (offset > 7)
- iowrite8(idio16gpio->out_state >> 8, &idio16gpio->reg->out8_15);
- else
- iowrite8(idio16gpio->out_state, &idio16gpio->reg->out0_7);
-
- 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 flags;

- raw_spin_lock_irqsave(&idio16gpio->lock, flags);
-
- idio16gpio->out_state &= ~*mask;
- idio16gpio->out_state |= *mask & *bits;
-
- if (*mask & 0xFF)
- iowrite8(idio16gpio->out_state, &idio16gpio->reg->out0_7);
- if ((*mask >> 8) & 0xFF)
- iowrite8(idio16gpio->out_state >> 8, &idio16gpio->reg->out8_15);
-
- 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)
@@ -297,7 +237,10 @@ static int idio_16_probe(struct device *dev, unsigned int id)
idio16gpio->chip.get_multiple = idio_16_gpio_get_multiple;
idio16gpio->chip.set = idio_16_gpio_set;
idio16gpio->chip.set_multiple = idio_16_gpio_set_multiple;
- idio16gpio->out_state = 0xFFFF;
+
+ idio_16_state_init(&idio16gpio->state);
+ /* FET off states are represented by bit values of "1" */
+ bitmap_fill(idio16gpio->state.out_state, IDIO_16_NOUT);

girq = &idio16gpio->chip.irq;
girq->chip = &idio_16_irqchip;
@@ -339,3 +282,4 @@ module_isa_driver_with_irq(idio_16_driver, num_idio_16, num_irq);
MODULE_AUTHOR("William Breathitt Gray <vilhelm.gray@gmail.com>");
MODULE_DESCRIPTION("ACCES 104-IDIO-16 GPIO driver");
MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(GPIO_IDIO_16);
--
2.37.3