diff options
| author | [email protected] <[email protected]> | 2012-05-22 17:32:32 +0000 |
|---|---|---|
| committer | [email protected] <[email protected]> | 2012-05-22 17:32:32 +0000 |
| commit | 55460652d39a6e60562bd318f35b757d4bf41d5c (patch) | |
| tree | 72af5d0bf988e6d49472a8a9f79d7fc2b938db26 /components/drivers/i2c/i2c_dev.c | |
| parent | c891da75df38fb5e1071bb2b20efde9b856d7dbf (diff) | |
ADD I2C driver framework and I2C gpio driver
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2128 bbd45198-f89e-11dd-88c7-29a3b14d5316
Diffstat (limited to 'components/drivers/i2c/i2c_dev.c')
| -rw-r--r-- | components/drivers/i2c/i2c_dev.c | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/components/drivers/i2c/i2c_dev.c b/components/drivers/i2c/i2c_dev.c new file mode 100644 index 0000000000..e74d6252a7 --- /dev/null +++ b/components/drivers/i2c/i2c_dev.c @@ -0,0 +1,137 @@ +#include <i2c.h>
+#include <i2c_dev.h>
+
+static rt_err_t i2c_bus_device_init(rt_device_t dev)
+{
+ struct rt_i2c_bus* bus;
+ struct rt_i2c_device *i2c_device = dev->user_data;
+
+ bus = i2c_device->bus;
+ RT_ASSERT(bus != RT_NULL);
+
+ return RT_EOK;
+}
+
+static rt_size_t i2c_bus_device_read (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t count)
+{
+ struct rt_i2c_bus* bus;
+ struct rt_i2c_device *i2c_device = dev->user_data;
+
+ bus = i2c_device->bus;
+ RT_ASSERT(bus != RT_NULL);
+ RT_ASSERT(i2c_device != RT_NULL);
+ RT_ASSERT(buffer != RT_NULL);
+
+ i2c_dbg("I2C bus dev [%s] reading %u bytes.\n", bus->name, count);
+
+ return rt_i2c_master_recv(i2c_device, buffer, count);
+}
+
+
+static rt_size_t i2c_bus_device_write (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+{
+ struct rt_i2c_bus* bus;
+ struct rt_i2c_device *i2c_device = dev->user_data;
+
+ bus = i2c_device->bus;
+ RT_ASSERT(bus != RT_NULL);
+ RT_ASSERT(i2c_device != RT_NULL);
+ RT_ASSERT(buffer != RT_NULL);
+
+ i2c_dbg("I2C bus dev writing %u bytes.\n", bus->name, size);
+
+ return rt_i2c_master_send(i2c_device, buffer, size);
+}
+
+static rt_err_t i2c_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+{
+ rt_err_t ret;
+ struct rt_i2c_bus* bus;
+ struct rt_i2c_priv_data *priv_data;
+ struct rt_i2c_device *i2c_device = dev->user_data;
+
+ bus = i2c_device->bus;
+ RT_ASSERT(bus != RT_NULL);
+ RT_ASSERT(i2c_device != RT_NULL);
+
+ switch (cmd)
+ {
+ case RT_I2C_DEV_CTRL_10BIT: /* set 10-bit addr mode */
+ i2c_device->flags |= RT_I2C_ADDR_10BIT;
+ break;
+ case RT_I2C_DEV_CTRL_ADDR:
+ i2c_device->addr = *(rt_uint16_t *)args;
+ break;
+ case RT_I2C_DEV_CTRL_TIMEOUT:
+ bus->timeout = *(rt_uint32_t *)args;
+ break;
+ case RT_I2C_DEV_CTRL_RW:
+ priv_data = (struct rt_i2c_priv_data *)args;
+ ret = rt_i2c_transfer(bus, priv_data->msgs, priv_data->number);
+ if (ret < 0)
+ {
+ return -RT_EIO;
+ }
+ break;
+ default: break;
+ }
+
+ return RT_EOK;
+}
+
+
+rt_err_t rt_i2c_bus_device_init(struct rt_i2c_bus* bus, const char* name)
+{
+ struct rt_device *device;
+ struct rt_i2c_device *i2c_device;
+ RT_ASSERT(bus != RT_NULL);
+
+ //device = &bus->parent;
+
+ i2c_device = rt_malloc(sizeof(struct rt_i2c_device));
+ if (i2c_device == RT_NULL)
+ {
+ return -RT_ENOMEM;
+ }
+
+ rt_memset(i2c_device, 0, sizeof(struct rt_i2c_device));
+
+ device = &i2c_device->dev;
+ i2c_device->bus = bus;
+ bus->parent = device;
+
+ device->user_data = i2c_device;
+
+ /* set device type */
+ device->type = RT_Device_Class_I2CBUS;
+ /* initialize device interface */
+ device->init = i2c_bus_device_init;
+ device->open = RT_NULL;
+ device->close = RT_NULL;
+ device->read = i2c_bus_device_read;
+ device->write = i2c_bus_device_write;
+ device->control = i2c_bus_device_control;
+
+ /* register to device manager */
+ rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
+
+ return RT_EOK;
+}
+
+rt_err_t rt_i2c_bus_device_exit(struct rt_i2c_bus* bus)
+{
+ struct rt_device *device;
+ struct rt_i2c_device *i2c_device;
+ RT_ASSERT(bus != RT_NULL);
+
+ device = bus->parent;
+
+ i2c_device = device->user_data;;
+
+ /* register to device manager */
+ rt_device_unregister(device);
+
+ rt_free(i2c_device);
+
+ return RT_EOK;
+}
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