pca953x: support 16-pin devices

This adds support for for the PCA9535/PCA9539 family of gpio devices which
have 16 output pins.

To let the driver know which devices are 16-pin it is necessary to define
CONFIG_SYS_I2C_PCA953X_WIDTH in your board config file. This is used to
create an array of {chip, ngpio} tuples that are used to determine the
width of a particular chip. For backwards compatibility it is assumed that
any chip not defined in CONFIG_SYS_I2C_PCA953X_WIDTH has 8 pins.

Acked-by: Peter Tyser <ptyser@xes-inc.com>
Tested-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>

diff --git a/README b/README
index 68f5fb09180ec39b4f87306a75e9902347e48cec..831c5af15c302e9cf63cf6bf2af3f4257c726503 100644 (file)
--- a/README
+++ b/README
@@ -746,6 +746,10 @@ The following options need to be configured:
                CONFIG_PCA953X          - use NXP's PCA953X series I2C GPIO
                CONFIG_PCA953X_INFO     - enable pca953x info command
 
+               The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of
+               chip-ngpio pairs that tell the PCA953X driver the number of
+               pins supported by a particular chip.
+
                Note that if the GPIO device uses I2C, then the I2C interface
                must also be configured. See I2C Support, below.
 

diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 6e82bd66afbd0eca41b9368b5641b8a73bf39f42..359fdeea23246b8285a5382b50b5e8885bd826af 100644 (file)
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -17,8 +17,8 @@
  */
 
 /*
- * Driver for NXP's 4 and 8 bit I2C gpio expanders (eg pca9537, pca9557, etc)
- * TODO: support additional devices with more than 8-bits GPIO
+ * Driver for NXP's 4, 8 and 16 bit I2C gpio expanders (eg pca9537, pca9557,
+ * pca9539, etc)
  */
 
 #include <common.h>
@@ -38,20 +38,81 @@ enum {
        PCA953X_CMD_INVERT,
 };
 
+#ifdef CONFIG_SYS_I2C_PCA953X_WIDTH
+struct pca953x_chip_ngpio {
+       uint8_t chip;
+       uint8_t ngpio;
+};
+
+static struct pca953x_chip_ngpio pca953x_chip_ngpios[] =
+    CONFIG_SYS_I2C_PCA953X_WIDTH;
+
+#define NUM_CHIP_GPIOS (sizeof(pca953x_chip_ngpios) / \
+                       sizeof(struct pca953x_chip_ngpio))
+
+/*
+ * Determine the number of GPIO pins supported. If we don't know we assume
+ * 8 pins.
+ */
+static int pca953x_ngpio(uint8_t chip)
+{
+       int i;
+
+       for (i = 0; i < NUM_CHIP_GPIOS; i++)
+               if (pca953x_chip_ngpios[i].chip == chip)
+                       return pca953x_chip_ngpios[i].ngpio;
+
+       return 8;
+}
+#else
+static int pca953x_ngpio(uint8_t chip)
+{
+       return 8;
+}
+#endif
+
 /*
  * Modify masked bits in register
  */
 static int pca953x_reg_write(uint8_t chip, uint addr, uint mask, uint data)
 {
-       uint8_t val;
+       uint8_t valb;
+       uint16_t valw;
 
-       if (i2c_read(chip, addr, 1, &val, 1))
-               return -1;
+       if (pca953x_ngpio(chip) <= 8) {
+               if (i2c_read(chip, addr, 1, &valb, 1))
+                       return -1;
+
+               valb &= ~mask;
+               valb |= data;
+
+               return i2c_write(chip, addr, 1, &valb, 1);
+       } else {
+               if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
+                       return -1;
 
-       val &= ~mask;
-       val |= data;
+               valw &= ~mask;
+               valw |= data;
 
-       return i2c_write(chip, addr, 1, &val, 1);
+               return i2c_write(chip, addr << 1, 1, (u8*)&valw, 2);
+       }
+}
+
+static int pca953x_reg_read(uint8_t chip, uint addr, uint *data)
+{
+       uint8_t valb;
+       uint16_t valw;
+
+       if (pca953x_ngpio(chip) <= 8) {
+               if (i2c_read(chip, addr, 1, &valb, 1))
+                       return -1;
+               *data = (int)valb;
+       } else {
+               if (i2c_read(chip, addr << 1, 1, (u8*)&valw, 2))
+                       return -1;
+               *data = (int)valw;
+       }
+       return 0;
 }
 
 /*
@@ -86,9 +147,9 @@ int pca953x_set_dir(uint8_t chip, uint mask, uint data)
  */
 int pca953x_get_val(uint8_t chip)
 {
-       uint8_t val;
+       uint val;
 
-       if (i2c_read(chip, 0, 1, &val, 1))
+       if (pca953x_reg_read(chip, PCA953X_IN, &val) < 0)
                return -1;
 
        return (int)val;
@@ -102,37 +163,44 @@ int pca953x_get_val(uint8_t chip)
 static int pca953x_info(uint8_t chip)
 {
        int i;
-       uint8_t data;
+       uint data;
+       int nr_gpio = pca953x_ngpio(chip);
+       int msb = nr_gpio - 1;
 
-       printf("pca953x@ 0x%x:\n\n", chip);
-       printf("gpio pins: 76543210\n");
-       printf("-------------------\n");
+       printf("pca953x@ 0x%x (%d pins):\n\n", chip, nr_gpio);
+       printf("gpio pins: ");
+       for (i = msb; i >= 0; i--)
+               printf("%x", i);
+       printf("\n");
+       for (i = 11 + nr_gpio; i > 0; i--)
+               printf("-");
+       printf("\n");
 
-       if (i2c_read(chip, PCA953X_CONF, 1, &data, 1))
+       if (pca953x_reg_read(chip, PCA953X_CONF, &data) < 0)
                return -1;
        printf("conf:      ");
-       for (i = 7; i >= 0; i--)
+       for (i = msb; i >= 0; i--)
                printf("%c", data & (1 << i) ? 'i' : 'o');
        printf("\n");
 
-       if (i2c_read(chip, PCA953X_POL, 1, &data, 1))
+       if (pca953x_reg_read(chip, PCA953X_POL, &data) < 0)
                return -1;
        printf("invert:    ");
-       for (i = 7; i >= 0; i--)
+       for (i = msb; i >= 0; i--)
                printf("%c", data & (1 << i) ? '1' : '0');
        printf("\n");
 
-       if (i2c_read(chip, PCA953X_IN, 1, &data, 1))
+       if (pca953x_reg_read(chip, PCA953X_IN, &data) < 0)
                return -1;
        printf("input:     ");
-       for (i = 7; i >= 0; i--)
+       for (i = msb; i >= 0; i--)
                printf("%c", data & (1 << i) ? '1' : '0');
        printf("\n");
 
-       if (i2c_read(chip, PCA953X_OUT, 1, &data, 1))
+       if (pca953x_reg_read(chip, PCA953X_OUT, &data) < 0)
                return -1;
        printf("output:    ");
-       for (i = 7; i >= 0; i--)
+       for (i = msb; i >= 0; i--)
                printf("%c", data & (1 << i) ? '1' : '0');
        printf("\n");