libchip: Add I2C SEMTECH SC620 octal LED driver

c/src/libchip/Makefile.am

@@ -67,6 +67,7 @@ EXTRA_DIST += rtc/README.ds1643 rtc/README.icm7170 rtc/README.m48t08 \
 # i2c
 include_libchip_HEADERS += i2c/i2c-ds1621.h \
 	i2c/i2c-2b-eeprom.h \
+	i2c/i2c-sc620.h \
 	i2c/spi-memdrv.h \
 	i2c/spi-flash-m25p40.h \
 	i2c/spi-fram-fm25l256.h \
@@ -82,6 +83,7 @@ libi2cio_a_SOURCES = i2c/i2c-ds1621.h \
 	i2c/spi-fram-fm25l256.h \
 	i2c/i2c-ds1621.c \
 	i2c/i2c-2b-eeprom.c \
+	i2c/i2c-sc620.c \
 	i2c/spi-memdrv.c \
 	i2c/spi-flash-m25p40.c \
 	i2c/spi-fram-fm25l256.c \

c/src/libchip/i2c/i2c-sc620.c

@@ -0,0 +1,95 @@
+/**
+ * @file
+ *
+ * @brief I2C Driver for SEMTECH SC620 Octal LED Driver
+ */
+
+/*
+ * Copyright (c) 2013 embedded brains GmbH.  All rights reserved.
+ *
+ *  embedded brains GmbH
+ *  Obere Lagerstr. 30
+ *  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.com/license/LICENSE.
+ */
+
+#ifdef HAVE_CONFIG_H
+  #include "config.h"
+#endif
+
+#include <libchip/i2c-sc620.h>
+
+#include <rtems/libio.h>
+
+#define SC620_REG_COUNT 10
+
+static rtems_status_code i2c_sc620_write(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *arg
+)
+{
+  rtems_status_code sc = RTEMS_IO_ERROR;
+  rtems_libio_rw_args_t *rw = arg;
+  unsigned char *buf = (unsigned char *) &rw->buffer[0];
+
+  if (rw->count == 2 && buf[0] < SC620_REG_COUNT) {
+    int rv;
+
+    rv = rtems_libi2c_start_write_bytes(
+      minor, buf, 2
+    );
+    if (rv == 2) {
+      sc = rtems_libi2c_send_stop(minor);
+    }
+  }
+
+  rw->bytes_moved = sc == RTEMS_SUCCESSFUL ? 2 : 0;
+
+  return sc;
+}
+
+static rtems_status_code i2c_sc620_read(
+  rtems_device_major_number major,
+  rtems_device_minor_number minor,
+  void *arg
+)
+{
+  rtems_status_code sc = RTEMS_IO_ERROR;
+  rtems_libio_rw_args_t *rw = arg;
+  unsigned char *buf = (unsigned char *) &rw->buffer[0];
+
+  if (rw->count == 1 && buf[0] < SC620_REG_COUNT) {
+    int rv;
+
+    rv = rtems_libi2c_start_write_bytes(minor, buf, 1);
+    if (rv == 1) {
+      sc = rtems_libi2c_send_addr(minor, 0);
+      if (sc == RTEMS_SUCCESSFUL) {
+        rv = rtems_libi2c_read_bytes(minor, buf, 1);
+        if (rv == 1) {
+          sc = rtems_libi2c_send_stop(minor);
+        }
+      }
+    }
+  }
+
+  rw->bytes_moved = sc == RTEMS_SUCCESSFUL ? 1 : 0;
+
+  return sc;
+}
+
+static rtems_driver_address_table i2c_sc620_ops = {
+  .read_entry =  i2c_sc620_read,
+  .write_entry = i2c_sc620_write
+};
+
+rtems_libi2c_drv_t i2c_sc620_driver = {
+  .ops = &i2c_sc620_ops,
+  .size = sizeof(i2c_sc620_driver)
+};

c/src/libchip/i2c/i2c-sc620.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2013 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.com/license/LICENSE.
+ */
+
+#ifndef I2C_SC620_H
+#define I2C_SC620_H
+
+#include <rtems/libi2c.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/**
+ * @brief I2C driver for SEMTECH SC620 octal LED driver.
+ *
+ * A write() must use two character buffer.  The buffer[0] value specifies the
+ * register and the buffer[1] value specifies the register data.
+ *
+ * A read() must use a one character buffer.  The buffer[0] value specifies the
+ * register on function entry.  The buffer[0] value contains the register value
+ * after a successful operation.
+ */
+extern rtems_libi2c_drv_t i2c_sc620_driver;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* I2C_SC620_H */

c/src/libchip/preinstall.am

@@ -126,6 +126,10 @@ $(PROJECT_INCLUDE)/libchip/i2c-2b-eeprom.h: i2c/i2c-2b-eeprom.h $(PROJECT_INCLUD
 	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/libchip/i2c-2b-eeprom.h
 PREINSTALL_FILES += $(PROJECT_INCLUDE)/libchip/i2c-2b-eeprom.h
 
+$(PROJECT_INCLUDE)/libchip/i2c-sc620.h: i2c/i2c-sc620.h $(PROJECT_INCLUDE)/libchip/$(dirstamp)
+	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/libchip/i2c-sc620.h
+PREINSTALL_FILES += $(PROJECT_INCLUDE)/libchip/i2c-sc620.h
+
 $(PROJECT_INCLUDE)/libchip/spi-memdrv.h: i2c/spi-memdrv.h $(PROJECT_INCLUDE)/libchip/$(dirstamp)
 	$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/libchip/spi-memdrv.h
 PREINSTALL_FILES += $(PROJECT_INCLUDE)/libchip/spi-memdrv.h