From 67ac69fc3f9b47af19df3176317adc5a6cb5d4fa Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Fri, 7 Nov 2014 13:50:01 +0100
Subject: Add NXP PCA9535 16-bit GPIO I2C driver

---
 cpukit/dev/i2c/gpio-nxp-pca9535.c | 149 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100644 cpukit/dev/i2c/gpio-nxp-pca9535.c

(limited to 'cpukit/dev/i2c')

diff --git a/cpukit/dev/i2c/gpio-nxp-pca9535.c b/cpukit/dev/i2c/gpio-nxp-pca9535.c
new file mode 100644
index 0000000000..65df969e56
--- /dev/null
+++ b/cpukit/dev/i2c/gpio-nxp-pca9535.c
@@ -0,0 +1,149 @@
+/**
+ * @file
+ *
+ * @brief GPIO NXP PCA9535 Driver Implementation
+ *
+ * @ingroup I2CGPIONXPPCA9535
+ */
+
+/*
+ * Copyright (c) 2014 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Dornierstr. 4
+ *  82178 Puchheim
+ *  Germany
+ *  <rtems@embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#if HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <dev/i2c/gpio-nxp-pca9535.h>
+
+typedef enum {
+  GPIO_NXP_PCA9535_INPUT_PORT_0,
+  GPIO_NXP_PCA9535_INPUT_PORT_1,
+  GPIO_NXP_PCA9535_OUTPUT_PORT_0,
+  GPIO_NXP_PCA9535_OUTPUT_PORT_1,
+  GPIO_NXP_PCA9535_POL_INV_PORT_0,
+  GPIO_NXP_PCA9535_POL_INV_PORT_1,
+  GPIO_NXP_PCA9535_CONF_PORT_0,
+  GPIO_NXP_PCA9535_CONF_PORT_1
+} gpio_nxp_pca9535_port;
+
+static int gpio_nxp_pca9535_get_reg(
+  i2c_dev *dev,
+  gpio_nxp_pca9535_port port,
+  uint16_t *val
+)
+{
+  uint8_t buf[1] = { port };
+  i2c_msg msgs[2] = {
+    {
+      .addr = dev->address,
+      .flags = 0,
+      .len = (uint16_t) sizeof(buf),
+      .buf = &buf[0]
+    }, {
+      .addr = dev->address,
+      .flags = I2C_M_RD,
+      .len = (uint16_t) sizeof(*val),
+      .buf = (uint8_t *) val
+    }
+  };
+
+  return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
+}
+
+static int gpio_nxp_pca9535_set_reg(
+  i2c_dev *dev,
+  gpio_nxp_pca9535_port port,
+  uint16_t val
+)
+{
+  uint8_t buf[3] = { port, (uint8_t) val, (uint8_t) (val >> 8) };
+  i2c_msg msgs[1] = {
+    {
+      .addr = dev->address,
+      .flags = 0,
+      .len = (uint16_t) sizeof(buf),
+      .buf = &buf[0]
+    }
+  };
+
+  return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs));
+}
+
+static int gpio_nxp_pca9535_ioctl(
+  i2c_dev *dev,
+  ioctl_command_t command,
+  void *arg
+)
+{
+  uint16_t v16 = (uint16_t)(uintptr_t) arg;
+  uint32_t v32 = (uint32_t)(uintptr_t) arg;
+  int err;
+
+  switch (command) {
+    case GPIO_NXP_PCA9535_GET_INPUT:
+      err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_INPUT_PORT_0, arg);
+      break;
+    case GPIO_NXP_PCA9535_GET_OUTPUT:
+      err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, arg);
+      break;
+    case GPIO_NXP_PCA9535_CLEAR_AND_SET_OUTPUT:
+      i2c_bus_obtain(dev->bus);
+      err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, &v16);
+      if (err == 0) {
+        v16 &= ~((uint16_t) v32);
+        v16 |= (uint16_t) (v32 >> 16);
+        err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, v16);
+      }
+      i2c_bus_release(dev->bus);
+      break;
+    case GPIO_NXP_PCA9535_SET_OUTPUT:
+      err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_OUTPUT_PORT_0, v16);
+      break;
+    case GPIO_NXP_PCA9535_GET_POL_INV:
+      err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_POL_INV_PORT_0, arg);
+      break;
+    case GPIO_NXP_PCA9535_SET_POL_INV:
+      err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_POL_INV_PORT_0, v16);
+      break;
+    case GPIO_NXP_PCA9535_GET_CONFIG:
+      err = gpio_nxp_pca9535_get_reg(dev, GPIO_NXP_PCA9535_CONF_PORT_0, arg);
+      break;
+    case GPIO_NXP_PCA9535_SET_CONFIG:
+      err = gpio_nxp_pca9535_set_reg(dev, GPIO_NXP_PCA9535_CONF_PORT_0, v16);
+      break;
+    default:
+      err = -ENOTTY;
+      break;
+  }
+
+  return err;
+}
+
+int i2c_dev_register_gpio_nxp_pca9535(
+  const char *bus_path,
+  const char *dev_path,
+  uint16_t address
+)
+{
+  i2c_dev *dev;
+
+  dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address);
+  if (dev == NULL) {
+    return -1;
+  }
+
+  dev->ioctl = gpio_nxp_pca9535_ioctl;
+
+  return i2c_dev_register(dev, dev_path);
+}
-- 
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