Source of spi-mem.c - linux-imx - PHYTEC BitBucket (Stash)

Ignore whitespace
Show whitespace characters
Hide e-diff
Unified diff
Side-by-side diff
Source viewDiff to previous
 
 */
void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc)
{
    struct spi_controller *ctlr = desc->mem->spi->controller;
​
    if (!desc->nodirmap && ctlr->mem_ops && ctlr->mem_ops->dirmap_destroy)
        ctlr->mem_ops->dirmap_destroy(desc);
}
EXPORT_SYMBOL_GPL(spi_mem_dirmap_destroy);
​
static void devm_spi_mem_dirmap_release(struct device *dev, void *res)
{
    struct spi_mem_dirmap_desc *desc = *(struct spi_mem_dirmap_desc **)res;
​
    spi_mem_dirmap_destroy(desc);
}
​
/**
 * devm_spi_mem_dirmap_create() - Create a direct mapping descriptor and attach
 *                it to a device
 * @dev: device the dirmap desc will be attached to
 * @mem: SPI mem device this direct mapping should be created for
 * @info: direct mapping information
 *
 * devm_ variant of the spi_mem_dirmap_create() function. See
 * spi_mem_dirmap_create() for more details.
 *
 * Return: a valid pointer in case of success, and ERR_PTR() otherwise.
 */
struct spi_mem_dirmap_desc *
devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,
               const struct spi_mem_dirmap_info *info)
{
    struct spi_mem_dirmap_desc **ptr, *desc;
​
    ptr = devres_alloc(devm_spi_mem_dirmap_release, sizeof(*ptr),
               GFP_KERNEL);
    if (!ptr)
        return ERR_PTR(-ENOMEM);
​
    desc = spi_mem_dirmap_create(mem, info);
    if (IS_ERR(desc)) {
        devres_free(ptr);
    } else {
        *ptr = desc;
        devres_add(dev, ptr);
    }
​
    return desc;
}
EXPORT_SYMBOL_GPL(devm_spi_mem_dirmap_create);
​
static int devm_spi_mem_dirmap_match(struct device *dev, void *res, void *data)
{
        struct spi_mem_dirmap_desc **ptr = res;
​
        if (WARN_ON(!ptr || !*ptr))
                return 0;
​
    return *ptr == data;
}
​
/**
 * devm_spi_mem_dirmap_destroy() - Destroy a direct mapping descriptor attached
 *                 to a device
 * @dev: device the dirmap desc is attached to
 * @desc: the direct mapping descriptor to destroy
 *
 * devm_ variant of the spi_mem_dirmap_destroy() function. See
 * spi_mem_dirmap_destroy() for more details.
 */
void devm_spi_mem_dirmap_destroy(struct device *dev,
                 struct spi_mem_dirmap_desc *desc)
{
    devres_release(dev, devm_spi_mem_dirmap_release,
               devm_spi_mem_dirmap_match, desc);
}
EXPORT_SYMBOL_GPL(devm_spi_mem_dirmap_destroy);
​
/**
 * spi_mem_dirmap_dirmap_read() - Read data through a direct mapping
 * @desc: direct mapping descriptor
 * @offs: offset to start reading from. Note that this is not an absolute
 *    offset, but the offset within the direct mapping which already has
 *    its own offset
 * @len: length in bytes
 * @buf: destination buffer. This buffer must be DMA-able
 *
 * This function reads data from a memory device using a direct mapping