1 files changed, 196 insertions, 0 deletions

diff --git a/drivers/misc/mpu3050/mpu-i2c.c b/drivers/misc/mpu3050/mpu-i2c.c
new file mode 100644
index 00000000000..b1298d313ab
--- /dev/null
+++ b/drivers/misc/mpu3050/mpu-i2c.c
@@ -0,0 +1,196 @@
+/*
+ $License:
+    Copyright (C) 2010 InvenSense Corporation, All Rights Reserved.
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+  $
+ */
+
+/**
+ *  @defgroup
+ *  @brief
+ *
+ *  @{
+ *      @file   mpu-i2c.c
+ *      @brief
+ *
+ */
+
+#include <linux/i2c.h>
+#include "mpu.h"
+
+int sensor_i2c_write(struct i2c_adapter *i2c_adap,
+                     unsigned char address,
+                     unsigned int len, unsigned char const *data)
+{
+        struct i2c_msg msgs[1];
+        int res;
+
+        if (NULL == data || NULL == i2c_adap)
+                return -EINVAL;
+
+        msgs[0].addr = address;
+        msgs[0].flags = 0;      /* write */
+        msgs[0].buf = (unsigned char *) data;
+        msgs[0].len = len;
+
+        res = i2c_transfer(i2c_adap, msgs, 1);
+        if (res < 1)
+                return res;
+        else
+                return 0;
+}
+
+int sensor_i2c_write_register(struct i2c_adapter *i2c_adap,
+                              unsigned char address,
+                              unsigned char reg, unsigned char value)
+{
+        unsigned char data[2];
+
+        data[0] = reg;
+        data[1] = value;
+        return sensor_i2c_write(i2c_adap, address, 2, data);
+}
+
+int sensor_i2c_read(struct i2c_adapter *i2c_adap,
+                    unsigned char address,
+                    unsigned char reg,
+                    unsigned int len, unsigned char *data)
+{
+        struct i2c_msg msgs[2];
+        int res;
+
+        if (NULL == data || NULL == i2c_adap)
+                return -EINVAL;
+
+        msgs[0].addr = address;
+        msgs[0].flags = 0;      /* write */
+        msgs[0].buf = &reg;
+        msgs[0].len = 1;
+
+        msgs[1].addr = address;
+        msgs[1].flags = I2C_M_RD;
+        msgs[1].buf = data;
+        msgs[1].len = len;
+
+        res = i2c_transfer(i2c_adap, msgs, 2);
+        if (res < 2)
+                return res;
+        else
+                return 0;
+}
+
+int mpu_memory_read(struct i2c_adapter *i2c_adap,
+                    unsigned char mpu_addr,
+                    unsigned short mem_addr,
+                    unsigned int len, unsigned char *data)
+{
+        unsigned char bank[2];
+        unsigned char addr[2];
+        unsigned char buf;
+
+        struct i2c_msg msgs[4];
+        int ret;
+
+        if (NULL == data || NULL == i2c_adap)
+                return -EINVAL;
+
+        bank[0] = MPUREG_BANK_SEL;
+        bank[1] = mem_addr >> 8;
+
+        addr[0] = MPUREG_MEM_START_ADDR;
+        addr[1] = mem_addr & 0xFF;
+
+        buf = MPUREG_MEM_R_W;
+
+        /* Write Message */
+        msgs[0].addr = mpu_addr;
+        msgs[0].flags = 0;
+        msgs[0].buf = bank;
+        msgs[0].len = sizeof(bank);
+
+        msgs[1].addr = mpu_addr;
+        msgs[1].flags = 0;
+        msgs[1].buf = addr;
+        msgs[1].len = sizeof(addr);
+
+        msgs[2].addr = mpu_addr;
+        msgs[2].flags = 0;
+        msgs[2].buf = &buf;
+        msgs[2].len = 1;
+
+        msgs[3].addr = mpu_addr;
+        msgs[3].flags = I2C_M_RD;
+        msgs[3].buf = data;
+        msgs[3].len = len;
+
+        ret = i2c_transfer(i2c_adap, msgs, 4);
+        if (ret != 4)
+                return ret;
+        else
+                return 0;
+}
+
+int mpu_memory_write(struct i2c_adapter *i2c_adap,
+                     unsigned char mpu_addr,
+                     unsigned short mem_addr,
+                     unsigned int len, unsigned char const *data)
+{
+        unsigned char bank[2];
+        unsigned char addr[2];
+        unsigned char buf[513];
+
+        struct i2c_msg msgs[3];
+        int ret;
+
+        if (NULL == data || NULL == i2c_adap)
+                return -EINVAL;
+        if (len >= (sizeof(buf) - 1))
+                return -ENOMEM;
+
+        bank[0] = MPUREG_BANK_SEL;
+        bank[1] = mem_addr >> 8;
+
+        addr[0] = MPUREG_MEM_START_ADDR;
+        addr[1] = mem_addr & 0xFF;
+
+        buf[0] = MPUREG_MEM_R_W;
+        memcpy(buf + 1, data, len);
+
+        /* Write Message */
+        msgs[0].addr = mpu_addr;
+        msgs[0].flags = 0;
+        msgs[0].buf = bank;
+        msgs[0].len = sizeof(bank);
+
+        msgs[1].addr = mpu_addr;
+        msgs[1].flags = 0;
+        msgs[1].buf = addr;
+        msgs[1].len = sizeof(addr);
+
+        msgs[2].addr = mpu_addr;
+        msgs[2].flags = 0;
+        msgs[2].buf = (unsigned char *) buf;
+        msgs[2].len = len + 1;
+
+        ret = i2c_transfer(i2c_adap, msgs, 3);
+        if (ret != 3)
+                return ret;
+        else
+                return 0;
+}
+
+/**
+ *  @}
+ */