[PATCH v2] gpio: ge: Convert to platform driver

[Alexander Shiyan <shc_work@mail.ru>]

This patch converts GE I/O FPGA GPIO driver to platform driver.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
---
 drivers/gpio/gpio-ge.c | 174 +++++++++++++++----------------------------------
 1 file changed, 53 insertions(+), 121 deletions(-)

diff --git a/drivers/gpio/gpio-ge.c b/drivers/gpio/gpio-ge.c
index 7b95a4a..1237a73 100644
--- a/drivers/gpio/gpio-ge.c
+++ b/drivers/gpio/gpio-ge.c
@@ -18,15 +18,9 @@
  */
 
 #include <linux/kernel.h>
-#include <linux/compiler.h>
-#include <linux/init.h>
 #include <linux/io.h>
-#include <linux/of.h>
 #include <linux/of_device.h>
-#include <linux/of_platform.h>
 #include <linux/of_gpio.h>
-#include <linux/gpio.h>
-#include <linux/slab.h>
 #include <linux/module.h>
 
 #define GEF_GPIO_DIRECT		0x00
@@ -39,28 +33,26 @@
 #define GEF_GPIO_OVERRUN	0x1C
 #define GEF_GPIO_MODE		0x20
 
-static void _gef_gpio_set(void __iomem *reg, unsigned int offset, int value)
+static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 {
+	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 	unsigned int data;
 
-	data = ioread32be(reg);
-	/* value: 0=low; 1=high */
-	if (value & 0x1)
-		data = data | (0x1 << offset);
+	data = ioread32be(mmchip->regs + GEF_GPIO_OUT);
+	if (value)
+		data = data | BIT(offset);
 	else
-		data = data & ~(0x1 << offset);
-
-	iowrite32be(data, reg);
+		data = data & ~BIT(offset);
+	iowrite32be(data, mmchip->regs + GEF_GPIO_OUT);
 }
 
-
 static int gef_gpio_dir_in(struct gpio_chip *chip, unsigned offset)
 {
 	unsigned int data;
 	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 
 	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
-	data = data | (0x1 << offset);
+	data = data | BIT(offset);
 	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
 
 	return 0;
@@ -71,11 +63,11 @@ static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
 	unsigned int data;
 	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 
-	/* Set direction before switching to input */
-	_gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
+	/* Set value before switching to output */
+	gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
 
 	data = ioread32be(mmchip->regs + GEF_GPIO_DIRECT);
-	data = data & ~(0x1 << offset);
+	data = data & ~BIT(offset);
 	iowrite32be(data, mmchip->regs + GEF_GPIO_DIRECT);
 
 	return 0;
@@ -83,116 +75,56 @@ static int gef_gpio_dir_out(struct gpio_chip *chip, unsigned offset, int value)
 
 static int gef_gpio_get(struct gpio_chip *chip, unsigned offset)
 {
-	unsigned int data;
-	int state = 0;
 	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
 
-	data = ioread32be(mmchip->regs + GEF_GPIO_IN);
-	state = (int)((data >> offset) & 0x1);
-
-	return state;
+	return !!(ioread32be(mmchip->regs + GEF_GPIO_IN) & BIT(offset));
 }
 
-static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
-{
-	struct of_mm_gpio_chip *mmchip = to_of_mm_gpio_chip(chip);
-
-	_gef_gpio_set(mmchip->regs + GEF_GPIO_OUT, offset, value);
-}
+static const struct of_device_id gef_gpio_ids[] = {
+	{
+		.compatible	= "gef,sbc610-gpio",
+		.data		= (void *)19,
+	}, {
+		.compatible	= "gef,sbc310-gpio",
+		.data		= (void *)6,
+	}, {
+		.compatible	= "ge,imp3a-gpio",
+		.data		= (void *)16,
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(of, gef_gpio_ids);
 
-static int __init gef_gpio_init(void)
+static int __init gef_gpio_probe(struct platform_device *pdev)
 {
-	struct device_node *np;
-	int retval;
-	struct of_mm_gpio_chip *gef_gpio_chip;
-
-	for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
-
-		pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
-
-		/* Allocate chip structure */
-		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
-		if (!gef_gpio_chip) {
-			pr_err("%s: Unable to allocate structure\n",
-				np->full_name);
-			continue;
-		}
-
-		/* Setup pointers to chip functions */
-		gef_gpio_chip->gc.of_gpio_n_cells = 2;
-		gef_gpio_chip->gc.ngpio = 19;
-		gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
-		gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
-		gef_gpio_chip->gc.get = gef_gpio_get;
-		gef_gpio_chip->gc.set = gef_gpio_set;
-
-		/* This function adds a memory mapped GPIO chip */
-		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
-		if (retval) {
-			kfree(gef_gpio_chip);
-			pr_err("%s: Unable to add GPIO\n", np->full_name);
-		}
-	}
-
-	for_each_compatible_node(np, NULL, "gef,sbc310-gpio") {
-
-		pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
-
-		/* Allocate chip structure */
-		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
-		if (!gef_gpio_chip) {
-			pr_err("%s: Unable to allocate structure\n",
-				np->full_name);
-			continue;
-		}
-
-		/* Setup pointers to chip functions */
-		gef_gpio_chip->gc.of_gpio_n_cells = 2;
-		gef_gpio_chip->gc.ngpio = 6;
-		gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
-		gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
-		gef_gpio_chip->gc.get = gef_gpio_get;
-		gef_gpio_chip->gc.set = gef_gpio_set;
-
-		/* This function adds a memory mapped GPIO chip */
-		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
-		if (retval) {
-			kfree(gef_gpio_chip);
-			pr_err("%s: Unable to add GPIO\n", np->full_name);
-		}
-	}
-
-	for_each_compatible_node(np, NULL, "ge,imp3a-gpio") {
-
-		pr_debug("%s: Initialising GE GPIO\n", np->full_name);
-
-		/* Allocate chip structure */
-		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
-		if (!gef_gpio_chip) {
-			pr_err("%s: Unable to allocate structure\n",
-				np->full_name);
-			continue;
-		}
-
-		/* Setup pointers to chip functions */
-		gef_gpio_chip->gc.of_gpio_n_cells = 2;
-		gef_gpio_chip->gc.ngpio = 16;
-		gef_gpio_chip->gc.direction_input = gef_gpio_dir_in;
-		gef_gpio_chip->gc.direction_output = gef_gpio_dir_out;
-		gef_gpio_chip->gc.get = gef_gpio_get;
-		gef_gpio_chip->gc.set = gef_gpio_set;
-
-		/* This function adds a memory mapped GPIO chip */
-		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
-		if (retval) {
-			kfree(gef_gpio_chip);
-			pr_err("%s: Unable to add GPIO\n", np->full_name);
-		}
-	}
+	const struct of_device_id *of_id =
+		of_match_device(gef_gpio_ids, &pdev->dev);
+	struct of_mm_gpio_chip *mmchip;
+
+	mmchip = devm_kzalloc(&pdev->dev, sizeof(*mmchip), GFP_KERNEL);
+	if (!mmchip)
+		return -ENOMEM;
+
+	/* Setup pointers to chip functions */
+	mmchip->gc.ngpio = (u16)(uintptr_t)of_id->data;
+	mmchip->gc.of_gpio_n_cells = 2;
+	mmchip->gc.direction_input = gef_gpio_dir_in;
+	mmchip->gc.direction_output = gef_gpio_dir_out;
+	mmchip->gc.get = gef_gpio_get;
+	mmchip->gc.set = gef_gpio_set;
+
+	/* This function adds a memory mapped GPIO chip */
+	return of_mm_gpiochip_add(pdev->dev.of_node, mmchip);
+};
 
-	return 0;
+static struct platform_driver gef_gpio_driver = {
+	.driver = {
+		.name		= "gef-gpio",
+		.owner		= THIS_MODULE,
+		.of_match_table	= gef_gpio_ids,
+	},
 };
-arch_initcall(gef_gpio_init);
+module_platform_driver_probe(gef_gpio_driver, gef_gpio_probe);
 
 MODULE_DESCRIPTION("GE I/O FPGA GPIO driver");
 MODULE_AUTHOR("Martyn Welch <martyn.welch@ge.com");
-- 
1.8.3.2