[PATCH RFC 11/11 v4] gpio-pcf857x: Add block GPIO API

[Roland Stigge <stigge@antcom.de>]

This patch adds block GPIO API support to the gpio-pcf857x driver.

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

---
 drivers/gpio/gpio-pcf857x.c |   24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

--- linux-2.6.orig/drivers/gpio/gpio-pcf857x.c
+++ linux-2.6/drivers/gpio/gpio-pcf857x.c
@@ -158,6 +158,28 @@ static void pcf857x_set(struct gpio_chip
 	pcf857x_output(chip, offset, value);
 }
 
+static unsigned long pcf857x_get_block(struct gpio_chip *chip,
+				       unsigned long mask)
+{
+	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
+	int		value;
+
+	value = gpio->read(gpio->client);
+	return (value < 0) ? 0 : (value & mask);
+}
+
+static void pcf857x_set_block(struct gpio_chip *chip, unsigned long mask,
+			      unsigned long values)
+{
+	struct pcf857x	*gpio = container_of(chip, struct pcf857x, chip);
+
+	mutex_lock(&gpio->lock);
+	gpio->out &= ~mask;
+	gpio->out |= values & mask;
+	gpio->write(gpio->client, gpio->out);
+	mutex_unlock(&gpio->lock);
+}
+
 /*-------------------------------------------------------------------------*/
 
 static int pcf857x_to_irq(struct gpio_chip *chip, unsigned offset)
@@ -280,6 +302,8 @@ static int pcf857x_probe(struct i2c_clie
 	gpio->chip.owner		= THIS_MODULE;
 	gpio->chip.get			= pcf857x_get;
 	gpio->chip.set			= pcf857x_set;
+	gpio->chip.get_block		= pcf857x_get_block;
+	gpio->chip.set_block		= pcf857x_set_block;
 	gpio->chip.direction_input	= pcf857x_input;
 	gpio->chip.direction_output	= pcf857x_output;
 	gpio->chip.ngpio		= id->driver_data;