linux-kernel - [PATCH RFC 10/11 v4] gpio-max732x: Add block GPIO API

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Date:	Tue, 16 Oct 2012 01:31:26 +0200
From:	Roland Stigge <stigge@...com.de>
To:	grant.likely@...retlab.ca, linus.walleij@...aro.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	w.sang@...gutronix.de, jbe@...gutronix.de, plagnioj@...osoft.com,
	highguy@...il.com, broonie@...nsource.wolfsonmicro.com,
	daniel-gl@....net, gregkh@...uxfoundation.org, rmallon@...il.com
Cc:	Roland Stigge <stigge@...com.de>
Subject: [PATCH RFC 10/11 v4] gpio-max732x: Add block GPIO API

This patch adds block GPIO API support to the gpio-max732x driver.

Signed-off-by: Roland Stigge <stigge@...com.de>

---
 drivers/gpio/gpio-max732x.c |   59 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

--- linux-2.6.orig/drivers/gpio/gpio-max732x.c
+++ linux-2.6/drivers/gpio/gpio-max732x.c
@@ -219,6 +219,63 @@ out:
 	mutex_unlock(&chip->lock);
 }
 
+static unsigned long max732x_gpio_get_block(struct gpio_chip *gc,
+					    unsigned long mask)
+{
+	struct max732x_chip *chip;
+	uint8_t lo = 0;
+	uint8_t hi = 0;
+	int ret;
+
+	chip = container_of(gc, struct max732x_chip, gpio_chip);
+
+	if (mask & 0xFF) {
+		ret = max732x_readb(chip, is_group_a(chip, 0), &lo);
+		if (ret < 0)
+			return 0;
+	}
+	if (mask & 0xFF00) {
+		ret = max732x_readb(chip, is_group_a(chip, 8), &hi);
+		if (ret < 0)
+			return 0;
+	}
+
+	return (((unsigned long)hi << 8) | lo) & mask;
+}
+
+static void max732x_gpio_set_block(struct gpio_chip *gc, unsigned long mask,
+				   unsigned long values)
+{
+	struct max732x_chip *chip;
+	uint8_t reg_out;
+	uint8_t lo_mask = mask & 0xFF;
+	uint8_t hi_mask = (mask >> 8) & 0xFF;
+	int ret;
+
+	chip = container_of(gc, struct max732x_chip, gpio_chip);
+
+	mutex_lock(&chip->lock);
+
+	if (lo_mask) {
+		reg_out = (chip->reg_out[0] & ~lo_mask) | (values & lo_mask);
+		ret = max732x_writeb(chip, is_group_a(chip, 0), reg_out);
+		if (ret < 0)
+			goto out;
+		chip->reg_out[0] = reg_out;
+	}
+	if (hi_mask) {
+		reg_out = (chip->reg_out[1] & ~hi_mask) |
+			((values >> 8) & hi_mask);
+		ret = max732x_writeb(chip, is_group_a(chip, 8), reg_out);
+		if (ret < 0)
+			goto out;
+		chip->reg_out[1] = reg_out;
+	}
+
+out:
+	mutex_unlock(&chip->lock);
+}
+
 static int max732x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
 {
 	struct max732x_chip *chip;
@@ -562,8 +619,10 @@ static int __devinit max732x_setup_gpio(
 	if (chip->dir_output) {
 		gc->direction_output = max732x_gpio_direction_output;
 		gc->set = max732x_gpio_set_value;
+		gc->set_block = max732x_gpio_set_block;
 	}
 	gc->get = max732x_gpio_get_value;
+	gc->get_block = max732x_gpio_get_block;
 	gc->can_sleep = 1;
 
 	gc->base = gpio_start;
--
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