461 lines
12 KiB
C
461 lines
12 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2012-01-08 bernard first version.
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* 2012-02-03 bernard add const attribute to the ops.
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* 2012-05-15 dzzxzz fixed the return value in attach_device.
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* 2012-05-18 bernard Changed SPI message to message list.
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* Added take/release SPI device/bus interface.
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* 2012-09-28 aozima fixed rt_spi_release_bus assert error.
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*/
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#include <drivers/spi.h>
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extern rt_err_t rt_spi_bus_device_init(struct rt_spi_bus *bus, const char *name);
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extern rt_err_t rt_spidev_device_init(struct rt_spi_device *dev, const char *name);
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rt_err_t rt_spi_bus_register(struct rt_spi_bus *bus,
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const char *name,
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const struct rt_spi_ops *ops)
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{
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rt_err_t result;
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result = rt_spi_bus_device_init(bus, name);
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if (result != RT_EOK)
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return result;
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/* initialize mutex lock */
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rt_mutex_init(&(bus->lock), name, RT_IPC_FLAG_FIFO);
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/* set ops */
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bus->ops = ops;
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/* initialize owner */
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bus->owner = RT_NULL;
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/* set bus mode */
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bus->mode = RT_SPI_BUS_MODE_SPI;
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return RT_EOK;
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}
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rt_err_t rt_spi_bus_attach_device(struct rt_spi_device *device,
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const char *name,
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const char *bus_name,
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void *user_data)
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{
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rt_err_t result;
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rt_device_t bus;
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/* get physical spi bus */
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bus = rt_device_find(bus_name);
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if (bus != RT_NULL && bus->type == RT_Device_Class_SPIBUS)
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{
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device->bus = (struct rt_spi_bus *)bus;
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/* initialize spidev device */
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result = rt_spidev_device_init(device, name);
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if (result != RT_EOK)
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return result;
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rt_memset(&device->config, 0, sizeof(device->config));
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device->parent.user_data = user_data;
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return RT_EOK;
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}
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/* not found the host bus */
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return -RT_ERROR;
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}
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rt_err_t rt_spi_configure(struct rt_spi_device *device,
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struct rt_spi_configuration *cfg)
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{
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rt_err_t result;
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RT_ASSERT(device != RT_NULL);
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/* set configuration */
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device->config.data_width = cfg->data_width;
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device->config.mode = cfg->mode & RT_SPI_MODE_MASK ;
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device->config.max_hz = cfg->max_hz ;
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if (device->bus != RT_NULL)
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{
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner == device)
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{
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device->bus->ops->configure(device, &device->config);
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}
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/* release lock */
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rt_mutex_release(&(device->bus->lock));
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}
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}
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return RT_EOK;
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}
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rt_err_t rt_spi_send_then_send(struct rt_spi_device *device,
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const void *send_buf1,
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rt_size_t send_length1,
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const void *send_buf2,
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rt_size_t send_length2)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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result = -RT_EIO;
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goto __exit;
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}
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}
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/* send data1 */
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message.send_buf = send_buf1;
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message.recv_buf = RT_NULL;
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message.length = send_length1;
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message.cs_take = 1;
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message.cs_release = 0;
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message.next = RT_NULL;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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/* send data2 */
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message.send_buf = send_buf2;
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message.recv_buf = RT_NULL;
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message.length = send_length2;
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message.cs_take = 0;
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message.cs_release = 1;
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message.next = RT_NULL;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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result = RT_EOK;
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}
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else
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{
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return -RT_EIO;
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}
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__exit:
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rt_mutex_release(&(device->bus->lock));
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return result;
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}
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rt_err_t rt_spi_send_then_recv(struct rt_spi_device *device,
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const void *send_buf,
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rt_size_t send_length,
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void *recv_buf,
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rt_size_t recv_length)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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result = -RT_EIO;
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goto __exit;
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}
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}
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/* send data */
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message.send_buf = send_buf;
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message.recv_buf = RT_NULL;
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message.length = send_length;
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message.cs_take = 1;
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message.cs_release = 0;
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message.next = RT_NULL;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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/* recv data */
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message.send_buf = RT_NULL;
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message.recv_buf = recv_buf;
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message.length = recv_length;
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message.cs_take = 0;
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message.cs_release = 1;
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message.next = RT_NULL;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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result = RT_EOK;
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}
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else
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{
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return -RT_EIO;
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}
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__exit:
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rt_mutex_release(&(device->bus->lock));
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return result;
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}
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rt_size_t rt_spi_transfer(struct rt_spi_device *device,
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const void *send_buf,
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void *recv_buf,
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rt_size_t length)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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rt_set_errno(-RT_EIO);
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result = 0;
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goto __exit;
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}
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}
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/* initial message */
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message.send_buf = send_buf;
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message.recv_buf = recv_buf;
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message.length = length;
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message.cs_take = 1;
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message.cs_release = 1;
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message.next = RT_NULL;
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/* transfer message */
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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rt_set_errno(-RT_EIO);
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goto __exit;
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}
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}
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else
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{
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rt_set_errno(-RT_EIO);
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return 0;
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}
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__exit:
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rt_mutex_release(&(device->bus->lock));
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return result;
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}
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struct rt_spi_message *rt_spi_transfer_message(struct rt_spi_device *device,
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struct rt_spi_message *message)
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{
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rt_err_t result;
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struct rt_spi_message *index;
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RT_ASSERT(device != RT_NULL);
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/* get first message */
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index = message;
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if (index == RT_NULL)
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return index;
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result != RT_EOK)
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{
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rt_set_errno(-RT_EBUSY);
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return index;
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}
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/* reset errno */
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rt_set_errno(RT_EOK);
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/* configure SPI bus */
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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rt_set_errno(-RT_EIO);
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goto __exit;
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}
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}
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/* transmit each SPI message */
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while (index != RT_NULL)
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{
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/* transmit SPI message */
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result = device->bus->ops->xfer(device, index);
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if (result == 0)
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{
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rt_set_errno(-RT_EIO);
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break;
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}
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index = index->next;
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}
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__exit:
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/* release bus lock */
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rt_mutex_release(&(device->bus->lock));
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return index;
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}
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rt_err_t rt_spi_take_bus(struct rt_spi_device *device)
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{
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rt_err_t result = RT_EOK;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result != RT_EOK)
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{
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rt_set_errno(-RT_EBUSY);
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return -RT_EBUSY;
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}
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/* reset errno */
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rt_set_errno(RT_EOK);
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/* configure SPI bus */
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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rt_set_errno(-RT_EIO);
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/* release lock */
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rt_mutex_release(&(device->bus->lock));
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return -RT_EIO;
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}
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}
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return result;
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}
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rt_err_t rt_spi_release_bus(struct rt_spi_device *device)
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{
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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RT_ASSERT(device->bus->owner == device);
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/* release lock */
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rt_mutex_release(&(device->bus->lock));
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return RT_EOK;
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}
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rt_err_t rt_spi_take(struct rt_spi_device *device)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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rt_memset(&message, 0, sizeof(message));
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message.cs_take = 1;
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result = device->bus->ops->xfer(device, &message);
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return result;
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}
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rt_err_t rt_spi_release(struct rt_spi_device *device)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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rt_memset(&message, 0, sizeof(message));
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message.cs_release = 1;
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result = device->bus->ops->xfer(device, &message);
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return result;
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}
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