diff options
Diffstat (limited to 'drivers/staging/msm/mdp4_debugfs.c')
| -rw-r--r-- | drivers/staging/msm/mdp4_debugfs.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/drivers/staging/msm/mdp4_debugfs.c b/drivers/staging/msm/mdp4_debugfs.c new file mode 100644 index 00000000000..844d46775ec --- /dev/null +++ b/drivers/staging/msm/mdp4_debugfs.c @@ -0,0 +1,181 @@ +/* Copyright (c) 2009, Code Aurora Forum. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ +#include <linux/module.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/time.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/hrtimer.h> +#include <linux/clk.h> +#include <mach/hardware.h> +#include <linux/io.h> +#include <linux/debugfs.h> + +#include <asm/system.h> +#include <asm/mach-types.h> +#include <linux/semaphore.h> +#include <linux/uaccess.h> + +#include "mdp.h" +#include "msm_fb.h" +#include "mdp4.h" + + +#define MDP4_DEBUG_BUF 128 + + +static char mdp4_debug_buf[MDP4_DEBUG_BUF]; +static ulong mdp4_debug_offset; +static ulong mdp4_base_addr; + +static int mdp4_offset_set(void *data, u64 val) +{ + mdp4_debug_offset = (int)val; + return 0; +} + +static int mdp4_offset_get(void *data, u64 *val) +{ + *val = (u64)mdp4_debug_offset; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE( + mdp4_offset_fops, + mdp4_offset_get, + mdp4_offset_set, + "%llx\n"); + + +static int mdp4_debugfs_open(struct inode *inode, struct file *file) +{ + /* non-seekable */ + file->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE); + return 0; +} + +static int mdp4_debugfs_release(struct inode *inode, struct file *file) +{ + return 0; +} + +static ssize_t mdp4_debugfs_write( + struct file *file, + const char __user *buff, + size_t count, + loff_t *ppos) +{ + int cnt; + unsigned int data; + + printk(KERN_INFO "%s: offset=%d count=%d *ppos=%d\n", + __func__, (int)mdp4_debug_offset, (int)count, (int)*ppos); + + if (count > sizeof(mdp4_debug_buf)) + return -EFAULT; + + if (copy_from_user(mdp4_debug_buf, buff, count)) + return -EFAULT; + + + mdp4_debug_buf[count] = 0; /* end of string */ + + cnt = sscanf(mdp4_debug_buf, "%x", &data); + if (cnt < 1) { + printk(KERN_ERR "%s: sscanf failed cnt=%d" , __func__, cnt); + return -EINVAL; + } + + writel(&data, mdp4_base_addr + mdp4_debug_offset); + + return 0; +} + +static ssize_t mdp4_debugfs_read( + struct file *file, + char __user *buff, + size_t count, + loff_t *ppos) +{ + int len = 0; + unsigned int data; + + printk(KERN_INFO "%s: offset=%d count=%d *ppos=%d\n", + __func__, (int)mdp4_debug_offset, (int)count, (int)*ppos); + + if (*ppos) + return 0; /* the end */ + + data = readl(mdp4_base_addr + mdp4_debug_offset); + + len = snprintf(mdp4_debug_buf, 4, "%x\n", data); + + if (len > 0) { + if (len > count) + len = count; + if (copy_to_user(buff, mdp4_debug_buf, len)) + return -EFAULT; + } + + printk(KERN_INFO "%s: len=%d\n", __func__, len); + + if (len < 0) + return 0; + + *ppos += len; /* increase offset */ + + return len; +} + +static const struct file_operations mdp4_debugfs_fops = { + .open = mdp4_debugfs_open, + .release = mdp4_debugfs_release, + .read = mdp4_debugfs_read, + .write = mdp4_debugfs_write, +}; + +int mdp4_debugfs_init(void) +{ + struct dentry *dent = debugfs_create_dir("mdp4", NULL); + + if (IS_ERR(dent)) { + printk(KERN_ERR "%s(%d): debugfs_create_dir fail, error %ld\n", + __FILE__, __LINE__, PTR_ERR(dent)); + return -1; + } + + if (debugfs_create_file("offset", 0644, dent, 0, &mdp4_offset_fops) + == NULL) { + printk(KERN_ERR "%s(%d): debugfs_create_file: offset fail\n", + __FILE__, __LINE__); + return -1; + } + + if (debugfs_create_file("regs", 0644, dent, 0, &mdp4_debugfs_fops) + == NULL) { + printk(KERN_ERR "%s(%d): debugfs_create_file: regs fail\n", + __FILE__, __LINE__); + return -1; + } + + mdp4_debug_offset = 0; + mdp4_base_addr = (ulong) msm_mdp_base; /* defined at msm_fb_def.h */ + + return 0; +} |