diff options
Diffstat (limited to 'arch/sh/drivers/dma/dma-sysfs.c')
| -rw-r--r-- | arch/sh/drivers/dma/dma-sysfs.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/arch/sh/drivers/dma/dma-sysfs.c b/arch/sh/drivers/dma/dma-sysfs.c new file mode 100644 index 000000000..8ef318150 --- /dev/null +++ b/arch/sh/drivers/dma/dma-sysfs.c @@ -0,0 +1,164 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * arch/sh/drivers/dma/dma-sysfs.c + * + * sysfs interface for SH DMA API + * + * Copyright (C) 2004 - 2006 Paul Mundt + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/stat.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/string.h> +#include <asm/dma.h> + +static struct bus_type dma_subsys = { + .name = "dma", + .dev_name = "dma", +}; + +static ssize_t dma_show_devices(struct device *dev, + struct device_attribute *attr, char *buf) +{ + ssize_t len = 0; + int i; + + for (i = 0; i < 16; i++) { + struct dma_info *info = get_dma_info(i); + struct dma_channel *channel = get_dma_channel(i); + + if (unlikely(!info) || !channel) + continue; + + len += sprintf(buf + len, "%2d: %14s %s\n", + channel->chan, info->name, + channel->dev_id); + } + + return len; +} + +static DEVICE_ATTR(devices, S_IRUGO, dma_show_devices, NULL); + +static int __init dma_subsys_init(void) +{ + int ret; + + ret = subsys_system_register(&dma_subsys, NULL); + if (unlikely(ret)) + return ret; + + return device_create_file(dma_subsys.dev_root, &dev_attr_devices); +} +postcore_initcall(dma_subsys_init); + +static ssize_t dma_show_dev_id(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dma_channel *channel = to_dma_channel(dev); + return sprintf(buf, "%s\n", channel->dev_id); +} + +static ssize_t dma_store_dev_id(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dma_channel *channel = to_dma_channel(dev); + strcpy(channel->dev_id, buf); + return count; +} + +static DEVICE_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); + +static ssize_t dma_store_config(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dma_channel *channel = to_dma_channel(dev); + unsigned long config; + + config = simple_strtoul(buf, NULL, 0); + dma_configure_channel(channel->vchan, config); + + return count; +} + +static DEVICE_ATTR(config, S_IWUSR, NULL, dma_store_config); + +static ssize_t dma_show_mode(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dma_channel *channel = to_dma_channel(dev); + return sprintf(buf, "0x%08x\n", channel->mode); +} + +static ssize_t dma_store_mode(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct dma_channel *channel = to_dma_channel(dev); + channel->mode = simple_strtoul(buf, NULL, 0); + return count; +} + +static DEVICE_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); + +#define dma_ro_attr(field, fmt) \ +static ssize_t dma_show_##field(struct device *dev, \ + struct device_attribute *attr, char *buf)\ +{ \ + struct dma_channel *channel = to_dma_channel(dev); \ + return sprintf(buf, fmt, channel->field); \ +} \ +static DEVICE_ATTR(field, S_IRUGO, dma_show_##field, NULL); + +dma_ro_attr(count, "0x%08x\n"); +dma_ro_attr(flags, "0x%08lx\n"); + +int dma_create_sysfs_files(struct dma_channel *chan, struct dma_info *info) +{ + struct device *dev = &chan->dev; + char name[16]; + int ret; + + dev->id = chan->vchan; + dev->bus = &dma_subsys; + + ret = device_register(dev); + if (ret) + return ret; + + ret |= device_create_file(dev, &dev_attr_dev_id); + ret |= device_create_file(dev, &dev_attr_count); + ret |= device_create_file(dev, &dev_attr_mode); + ret |= device_create_file(dev, &dev_attr_flags); + ret |= device_create_file(dev, &dev_attr_config); + + if (unlikely(ret)) { + dev_err(&info->pdev->dev, "Failed creating attrs\n"); + return ret; + } + + snprintf(name, sizeof(name), "dma%d", chan->chan); + return sysfs_create_link(&info->pdev->dev.kobj, &dev->kobj, name); +} + +void dma_remove_sysfs_files(struct dma_channel *chan, struct dma_info *info) +{ + struct device *dev = &chan->dev; + char name[16]; + + device_remove_file(dev, &dev_attr_dev_id); + device_remove_file(dev, &dev_attr_count); + device_remove_file(dev, &dev_attr_mode); + device_remove_file(dev, &dev_attr_flags); + device_remove_file(dev, &dev_attr_config); + + snprintf(name, sizeof(name), "dma%d", chan->chan); + sysfs_remove_link(&info->pdev->dev.kobj, name); + + device_unregister(dev); +} |