1*1da177e4SLinus Torvalds /* 2*1da177e4SLinus Torvalds * arch/sh/drivers/dma/dma-sysfs.c 3*1da177e4SLinus Torvalds * 4*1da177e4SLinus Torvalds * sysfs interface for SH DMA API 5*1da177e4SLinus Torvalds * 6*1da177e4SLinus Torvalds * Copyright (C) 2004 Paul Mundt 7*1da177e4SLinus Torvalds * 8*1da177e4SLinus Torvalds * This file is subject to the terms and conditions of the GNU General Public 9*1da177e4SLinus Torvalds * License. See the file "COPYING" in the main directory of this archive 10*1da177e4SLinus Torvalds * for more details. 11*1da177e4SLinus Torvalds */ 12*1da177e4SLinus Torvalds #include <linux/kernel.h> 13*1da177e4SLinus Torvalds #include <linux/init.h> 14*1da177e4SLinus Torvalds #include <linux/sysdev.h> 15*1da177e4SLinus Torvalds #include <linux/module.h> 16*1da177e4SLinus Torvalds #include <asm/dma.h> 17*1da177e4SLinus Torvalds 18*1da177e4SLinus Torvalds static struct sysdev_class dma_sysclass = { 19*1da177e4SLinus Torvalds set_kset_name("dma"), 20*1da177e4SLinus Torvalds }; 21*1da177e4SLinus Torvalds 22*1da177e4SLinus Torvalds EXPORT_SYMBOL(dma_sysclass); 23*1da177e4SLinus Torvalds 24*1da177e4SLinus Torvalds static ssize_t dma_show_devices(struct sys_device *dev, char *buf) 25*1da177e4SLinus Torvalds { 26*1da177e4SLinus Torvalds ssize_t len = 0; 27*1da177e4SLinus Torvalds int i; 28*1da177e4SLinus Torvalds 29*1da177e4SLinus Torvalds for (i = 0; i < MAX_DMA_CHANNELS; i++) { 30*1da177e4SLinus Torvalds struct dma_info *info = get_dma_info(i); 31*1da177e4SLinus Torvalds struct dma_channel *channel = &info->channels[i]; 32*1da177e4SLinus Torvalds 33*1da177e4SLinus Torvalds len += sprintf(buf + len, "%2d: %14s %s\n", 34*1da177e4SLinus Torvalds channel->chan, info->name, 35*1da177e4SLinus Torvalds channel->dev_id); 36*1da177e4SLinus Torvalds } 37*1da177e4SLinus Torvalds 38*1da177e4SLinus Torvalds return len; 39*1da177e4SLinus Torvalds } 40*1da177e4SLinus Torvalds 41*1da177e4SLinus Torvalds static SYSDEV_ATTR(devices, S_IRUGO, dma_show_devices, NULL); 42*1da177e4SLinus Torvalds 43*1da177e4SLinus Torvalds static int __init dma_sysclass_init(void) 44*1da177e4SLinus Torvalds { 45*1da177e4SLinus Torvalds int ret; 46*1da177e4SLinus Torvalds 47*1da177e4SLinus Torvalds ret = sysdev_class_register(&dma_sysclass); 48*1da177e4SLinus Torvalds if (ret == 0) 49*1da177e4SLinus Torvalds sysfs_create_file(&dma_sysclass.kset.kobj, &attr_devices.attr); 50*1da177e4SLinus Torvalds 51*1da177e4SLinus Torvalds return ret; 52*1da177e4SLinus Torvalds } 53*1da177e4SLinus Torvalds 54*1da177e4SLinus Torvalds postcore_initcall(dma_sysclass_init); 55*1da177e4SLinus Torvalds 56*1da177e4SLinus Torvalds static ssize_t dma_show_dev_id(struct sys_device *dev, char *buf) 57*1da177e4SLinus Torvalds { 58*1da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 59*1da177e4SLinus Torvalds return sprintf(buf, "%s\n", channel->dev_id); 60*1da177e4SLinus Torvalds } 61*1da177e4SLinus Torvalds 62*1da177e4SLinus Torvalds static ssize_t dma_store_dev_id(struct sys_device *dev, 63*1da177e4SLinus Torvalds const char *buf, size_t count) 64*1da177e4SLinus Torvalds { 65*1da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 66*1da177e4SLinus Torvalds strcpy(channel->dev_id, buf); 67*1da177e4SLinus Torvalds return count; 68*1da177e4SLinus Torvalds } 69*1da177e4SLinus Torvalds 70*1da177e4SLinus Torvalds static SYSDEV_ATTR(dev_id, S_IRUGO | S_IWUSR, dma_show_dev_id, dma_store_dev_id); 71*1da177e4SLinus Torvalds 72*1da177e4SLinus Torvalds static ssize_t dma_store_config(struct sys_device *dev, 73*1da177e4SLinus Torvalds const char *buf, size_t count) 74*1da177e4SLinus Torvalds { 75*1da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 76*1da177e4SLinus Torvalds unsigned long config; 77*1da177e4SLinus Torvalds 78*1da177e4SLinus Torvalds config = simple_strtoul(buf, NULL, 0); 79*1da177e4SLinus Torvalds dma_configure_channel(channel->chan, config); 80*1da177e4SLinus Torvalds 81*1da177e4SLinus Torvalds return count; 82*1da177e4SLinus Torvalds } 83*1da177e4SLinus Torvalds 84*1da177e4SLinus Torvalds static SYSDEV_ATTR(config, S_IWUSR, NULL, dma_store_config); 85*1da177e4SLinus Torvalds 86*1da177e4SLinus Torvalds static ssize_t dma_show_mode(struct sys_device *dev, char *buf) 87*1da177e4SLinus Torvalds { 88*1da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 89*1da177e4SLinus Torvalds return sprintf(buf, "0x%08x\n", channel->mode); 90*1da177e4SLinus Torvalds } 91*1da177e4SLinus Torvalds 92*1da177e4SLinus Torvalds static ssize_t dma_store_mode(struct sys_device *dev, 93*1da177e4SLinus Torvalds const char *buf, size_t count) 94*1da177e4SLinus Torvalds { 95*1da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); 96*1da177e4SLinus Torvalds channel->mode = simple_strtoul(buf, NULL, 0); 97*1da177e4SLinus Torvalds return count; 98*1da177e4SLinus Torvalds } 99*1da177e4SLinus Torvalds 100*1da177e4SLinus Torvalds static SYSDEV_ATTR(mode, S_IRUGO | S_IWUSR, dma_show_mode, dma_store_mode); 101*1da177e4SLinus Torvalds 102*1da177e4SLinus Torvalds #define dma_ro_attr(field, fmt) \ 103*1da177e4SLinus Torvalds static ssize_t dma_show_##field(struct sys_device *dev, char *buf) \ 104*1da177e4SLinus Torvalds { \ 105*1da177e4SLinus Torvalds struct dma_channel *channel = to_dma_channel(dev); \ 106*1da177e4SLinus Torvalds return sprintf(buf, fmt, channel->field); \ 107*1da177e4SLinus Torvalds } \ 108*1da177e4SLinus Torvalds static SYSDEV_ATTR(field, S_IRUGO, dma_show_##field, NULL); 109*1da177e4SLinus Torvalds 110*1da177e4SLinus Torvalds dma_ro_attr(count, "0x%08x\n"); 111*1da177e4SLinus Torvalds dma_ro_attr(flags, "0x%08lx\n"); 112*1da177e4SLinus Torvalds 113*1da177e4SLinus Torvalds int __init dma_create_sysfs_files(struct dma_channel *chan) 114*1da177e4SLinus Torvalds { 115*1da177e4SLinus Torvalds struct sys_device *dev = &chan->dev; 116*1da177e4SLinus Torvalds int ret; 117*1da177e4SLinus Torvalds 118*1da177e4SLinus Torvalds dev->id = chan->chan; 119*1da177e4SLinus Torvalds dev->cls = &dma_sysclass; 120*1da177e4SLinus Torvalds 121*1da177e4SLinus Torvalds ret = sysdev_register(dev); 122*1da177e4SLinus Torvalds if (ret) 123*1da177e4SLinus Torvalds return ret; 124*1da177e4SLinus Torvalds 125*1da177e4SLinus Torvalds sysdev_create_file(dev, &attr_dev_id); 126*1da177e4SLinus Torvalds sysdev_create_file(dev, &attr_count); 127*1da177e4SLinus Torvalds sysdev_create_file(dev, &attr_mode); 128*1da177e4SLinus Torvalds sysdev_create_file(dev, &attr_flags); 129*1da177e4SLinus Torvalds sysdev_create_file(dev, &attr_config); 130*1da177e4SLinus Torvalds 131*1da177e4SLinus Torvalds return 0; 132*1da177e4SLinus Torvalds } 133*1da177e4SLinus Torvalds 134