gpio: Adapt PCA9698 to standard GPIO API

[karo-tx-uboot.git] / drivers / gpio / pca9698.c

diff --git a/drivers/gpio/pca9698.c b/drivers/gpio/pca9698.c
index b946efa7a98379e6de82e44cb7b299f343cc90af..fe6d2c668070adcd111631ed69418ecd7a0b676e 100644 (file)
--- a/drivers/gpio/pca9698.c
+++ b/drivers/gpio/pca9698.c
@@ -27,6 +27,7 @@
 
 #include <common.h>
 #include <i2c.h>
+#include <asm/errno.h>
 #include <pca9698.h>
 
 /*
@@ -39,19 +40,20 @@
 #define PCA9698_REG_CONFIG             0x18
 
 #define PCA9698_BUFFER_SIZE            5
+#define PCA9698_GPIO_COUNT             40
 
-static int pca9698_read40(u8 chip, u8 offset, u8 *buffer)
+static int pca9698_read40(u8 addr, u8 offset, u8 *buffer)
 {
        u8 command = offset | 0x80;  /* autoincrement */
 
-       return i2c_read(chip, command, 1, buffer, PCA9698_BUFFER_SIZE);
+       return i2c_read(addr, command, 1, buffer, PCA9698_BUFFER_SIZE);
 }
 
-static int pca9698_write40(u8 chip, u8 offset, u8 *buffer)
+static int pca9698_write40(u8 addr, u8 offset, u8 *buffer)
 {
        u8 command = offset | 0x80;  /* autoincrement */
 
-       return i2c_write(chip, command, 1, buffer, PCA9698_BUFFER_SIZE);
+       return i2c_write(addr, command, 1, buffer, PCA9698_BUFFER_SIZE);
 }
 
 static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value)
@@ -65,41 +67,59 @@ static void pca9698_set_bit(unsigned gpio, u8 *buffer, unsigned value)
                buffer[byte] &= ~(1 << bit);
 }
 
-int pca9698_direction_input(u8 chip, unsigned offset)
+int pca9698_request(unsigned gpio, const char *label)
+{
+       if (gpio >= PCA9698_GPIO_COUNT)
+               return -EINVAL;
+
+       return 0;
+}
+
+void pca9698_free(unsigned gpio)
+{
+}
+
+int pca9698_direction_input(u8 addr, unsigned gpio)
 {
        u8 data[PCA9698_BUFFER_SIZE];
        int res;
 
-       res = pca9698_read40(chip, PCA9698_REG_CONFIG, data);
+       res = pca9698_read40(addr, PCA9698_REG_CONFIG, data);
        if (res)
                return res;
 
-       pca9698_set_bit(offset, data, 1);
-       return pca9698_write40(chip, PCA9698_REG_CONFIG, data);
+       pca9698_set_bit(gpio, data, 1);
+
+       return pca9698_write40(addr, PCA9698_REG_CONFIG, data);
 }
 
-int pca9698_direction_output(u8 chip, unsigned offset)
+int pca9698_direction_output(u8 addr, unsigned gpio, int value)
 {
        u8 data[PCA9698_BUFFER_SIZE];
        int res;
 
-       res = pca9698_read40(chip, PCA9698_REG_CONFIG, data);
+       res = pca9698_set_value(addr, gpio, value);
+       if (res)
+               return res;
+
+       res = pca9698_read40(addr, PCA9698_REG_CONFIG, data);
        if (res)
                return res;
 
-       pca9698_set_bit(offset, data, 0);
-       return pca9698_write40(chip, PCA9698_REG_CONFIG, data);
+       pca9698_set_bit(gpio, data, 0);
+
+       return pca9698_write40(addr, PCA9698_REG_CONFIG, data);
 }
 
-int pca9698_get_input(u8 chip, unsigned offset)
+int pca9698_get_value(u8 addr, unsigned gpio)
 {
-       unsigned config_byte = offset / 8;
-       unsigned config_bit = offset % 8;
+       unsigned config_byte = gpio / 8;
+       unsigned config_bit = gpio % 8;
        unsigned value;
        u8 data[PCA9698_BUFFER_SIZE];
        int res;
 
-       res = pca9698_read40(chip, PCA9698_REG_INPUT, data);
+       res = pca9698_read40(addr, PCA9698_REG_INPUT, data);
        if (res)
                return -1;
 
@@ -108,16 +128,16 @@ int pca9698_get_input(u8 chip, unsigned offset)
        return !!value;
 }
 
-int pca9698_set_output(u8 chip, unsigned offset, int value)
+int pca9698_set_value(u8 addr, unsigned gpio, int value)
 {
        u8 data[PCA9698_BUFFER_SIZE];
        int res;
 
-       res = pca9698_read40(chip, PCA9698_REG_OUTPUT, data);
+       res = pca9698_read40(addr, PCA9698_REG_OUTPUT, data);
        if (res)
                return res;
 
-       memset(data, sizeof(data), 0);
-       pca9698_set_bit(offset, data, value);
-       return pca9698_write40(chip, PCA9698_REG_OUTPUT, data);
+       pca9698_set_bit(gpio, data, value);
+
+       return pca9698_write40(addr, PCA9698_REG_OUTPUT, data);
 }