[PATCH v4 7/9] gpio: 104-dio-48e: Migrate to regmap API

[William Breathitt Gray <william.gray@xxxxxxxxxx>]

The regmap API supports IO port accessors so we can take advantage of
regmap abstractions rather than handling access to the device registers
directly in the driver. The 104-dio-48e module is migrated to the new
i8255 library interface leveraging the gpio-regmap API.

Suggested-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: William Breathitt Gray <william.gray@xxxxxxxxxx>
---
 drivers/gpio/gpio-104-dio-48e.c | 137 ++------------------------------
 1 file changed, 7 insertions(+), 130 deletions(-)

diff --git a/drivers/gpio/gpio-104-dio-48e.c b/drivers/gpio/gpio-104-dio-48e.c
index 4c3660d5dea5..31ae98a277a4 100644
--- a/drivers/gpio/gpio-104-dio-48e.c
+++ b/drivers/gpio/gpio-104-dio-48e.c
@@ -9,7 +9,6 @@
 #include <linux/bits.h>
 #include <linux/device.h>
 #include <linux/err.h>
-#include <linux/gpio/driver.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
 #include <linux/isa.h>
@@ -42,90 +41,6 @@ MODULE_PARM_DESC(irq, "ACCES 104-DIO-48E interrupt line numbers");
 
 #define DIO48E_NUM_PPI 2
 
-/**
- * struct dio48e_reg - device register structure
- * @ppi:		Programmable Peripheral Interface groups
- */
-struct dio48e_reg {
-	struct i8255 ppi[DIO48E_NUM_PPI];
-};
-
-/**
- * struct dio48e_gpio - GPIO device private data structure
- * @chip:		instance of the gpio_chip
- * @ppi_state:		PPI device states
- * @reg:		I/O address offset for the device registers
- */
-struct dio48e_gpio {
-	struct gpio_chip chip;
-	struct i8255_state ppi_state[DIO48E_NUM_PPI];
-	struct dio48e_reg __iomem *reg;
-};
-
-static int dio48e_gpio_get_direction(struct gpio_chip *chip, unsigned int offset)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	if (i8255_get_direction(dio48egpio->ppi_state, offset))
-		return GPIO_LINE_DIRECTION_IN;
-
-	return GPIO_LINE_DIRECTION_OUT;
-}
-
-static int dio48e_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	i8255_direction_input(dio48egpio->reg->ppi, dio48egpio->ppi_state,
-			      offset);
-
-	return 0;
-}
-
-static int dio48e_gpio_direction_output(struct gpio_chip *chip, unsigned int offset,
-					int value)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	i8255_direction_output(dio48egpio->reg->ppi, dio48egpio->ppi_state,
-			       offset, value);
-
-	return 0;
-}
-
-static int dio48e_gpio_get(struct gpio_chip *chip, unsigned int offset)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	return i8255_get(dio48egpio->reg->ppi, offset);
-}
-
-static int dio48e_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
-	unsigned long *bits)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	i8255_get_multiple(dio48egpio->reg->ppi, mask, bits, chip->ngpio);
-
-	return 0;
-}
-
-static void dio48e_gpio_set(struct gpio_chip *chip, unsigned int offset, int value)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	i8255_set(dio48egpio->reg->ppi, dio48egpio->ppi_state, offset, value);
-}
-
-static void dio48e_gpio_set_multiple(struct gpio_chip *chip,
-	unsigned long *mask, unsigned long *bits)
-{
-	struct dio48e_gpio *const dio48egpio = gpiochip_get_data(chip);
-
-	i8255_set_multiple(dio48egpio->reg->ppi, dio48egpio->ppi_state, mask,
-			   bits, chip->ngpio);
-}
-
 static const struct regmap_range dio48e_wr_ranges[] = {
 	regmap_reg_range(0x0, 0x9), regmap_reg_range(0xB, 0xB),
 	regmap_reg_range(0xD, 0xD), regmap_reg_range(0xF, 0xF),
@@ -240,25 +155,10 @@ static int dio48e_irq_init_hw(struct regmap *const map)
 	return regmap_read(map, DIO48E_DISABLE_INTERRUPT, &val);
 }
 
-static void dio48e_init_ppi(struct i8255 __iomem *const ppi,
-			    struct i8255_state *const ppi_state)
-{
-	const unsigned long ngpio = 24;
-	const unsigned long mask = GENMASK(ngpio - 1, 0);
-	const unsigned long bits = 0;
-	unsigned long i;
-
-	/* Initialize all GPIO to output 0 */
-	for (i = 0; i < DIO48E_NUM_PPI; i++) {
-		i8255_mode0_output(&ppi[i]);
-		i8255_set_multiple(&ppi[i], &ppi_state[i], &mask, &bits, ngpio);
-	}
-}
-
 static int dio48e_probe(struct device *dev, unsigned int id)
 {
-	struct dio48e_gpio *dio48egpio;
 	const char *const name = dev_name(dev);
+	struct i8255_regmap_config config = {};
 	void __iomem *regs;
 	struct regmap *map;
 	int err;
@@ -266,10 +166,6 @@ static int dio48e_probe(struct device *dev, unsigned int id)
 	unsigned int irq_mask;
 	struct regmap_irq_chip_data *chip_data;
 
-	dio48egpio = devm_kzalloc(dev, sizeof(*dio48egpio), GFP_KERNEL);
-	if (!dio48egpio)
-		return -ENOMEM;
-
 	if (!devm_request_region(dev, base[id], DIO48E_EXTENT, name)) {
 		dev_err(dev, "Unable to lock port addresses (0x%X-0x%X)\n",
 			base[id], base[id] + DIO48E_EXTENT);
@@ -279,7 +175,6 @@ static int dio48e_probe(struct device *dev, unsigned int id)
 	regs = devm_ioport_map(dev, base[id], DIO48E_EXTENT);
 	if (!regs)
 		return -ENOMEM;
-	dio48egpio->reg = regs;
 
 	map = devm_regmap_init_mmio(dev, regs, &dio48e_regmap_config);
 	if (IS_ERR(map))
@@ -314,31 +209,13 @@ static int dio48e_probe(struct device *dev, unsigned int id)
 	if (err)
 		return dev_err_probe(dev, err, "IRQ registration failed\n");
 
-	dio48egpio->chip.label = name;
-	dio48egpio->chip.parent = dev;
-	dio48egpio->chip.owner = THIS_MODULE;
-	dio48egpio->chip.base = -1;
-	dio48egpio->chip.ngpio = DIO48E_NGPIO;
-	dio48egpio->chip.names = dio48e_names;
-	dio48egpio->chip.get_direction = dio48e_gpio_get_direction;
-	dio48egpio->chip.direction_input = dio48e_gpio_direction_input;
-	dio48egpio->chip.direction_output = dio48e_gpio_direction_output;
-	dio48egpio->chip.get = dio48e_gpio_get;
-	dio48egpio->chip.get_multiple = dio48e_gpio_get_multiple;
-	dio48egpio->chip.set = dio48e_gpio_set;
-	dio48egpio->chip.set_multiple = dio48e_gpio_set_multiple;
-
-	i8255_state_init(dio48egpio->ppi_state, DIO48E_NUM_PPI);
-	dio48e_init_ppi(dio48egpio->reg->ppi, dio48egpio->ppi_state);
-
-	err = devm_gpiochip_add_data(dev, &dio48egpio->chip, dio48egpio);
-	if (err) {
-		dev_err(dev, "GPIO registering failed (%d)\n", err);
-		return err;
-	}
+	config.parent = dev;
+	config.map = map;
+	config.num_ppi = DIO48E_NUM_PPI;
+	config.names = dio48e_names;
+	config.domain = regmap_irq_get_domain(chip_data);
 
-	return gpiochip_irqchip_add_domain(&dio48egpio->chip,
-					   regmap_irq_get_domain(chip_data));
+	return devm_i8255_regmap_register(dev, &config);
 }
 
 static struct isa_driver dio48e_driver = {
-- 
2.38.1