drivers/staging/msm/mdp4_debugfs.c

   1 /* Copyright (c) 2009, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  15  * 02110-1301, USA.
  16  */
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/sched.h>
  20 #include <linux/time.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/spinlock.h>
  24 #include <linux/hrtimer.h>
  25 #include <linux/clk.h>
  26 #include <mach/hardware.h>
  27 #include <linux/io.h>
  28 #include <linux/debugfs.h>
  29
  30 #include <asm/system.h>
  31 #include <asm/mach-types.h>
  32 #include <linux/semaphore.h>
  33 #include <linux/uaccess.h>
  34
  35 #include "mdp.h"
  36 #include "msm_fb.h"
  37 #include "mdp4.h"
  38
  39
  40 #define MDP4_DEBUG_BUF  128
  41
  42
  43 static char mdp4_debug_buf[MDP4_DEBUG_BUF];
  44 static ulong mdp4_debug_offset;
  45 static ulong mdp4_base_addr;
  46
  47 static int mdp4_offset_set(void *data, u64 val)
  48 {
  49         mdp4_debug_offset = (int)val;
  50         return 0;
  51 }
  52
  53 static int mdp4_offset_get(void *data, u64 *val)
  54 {
  55         *val = (u64)mdp4_debug_offset;
  56         return 0;
  57 }
  58
  59 DEFINE_SIMPLE_ATTRIBUTE(
  60                         mdp4_offset_fops,
  61                         mdp4_offset_get,
  62                         mdp4_offset_set,
  63                         "%llx\n");
  64
  65
  66 static int mdp4_debugfs_release(struct inode *inode, struct file *file)
  67 {
  68         return 0;
  69 }
  70
  71 static ssize_t mdp4_debugfs_write(
  72         struct file *file,
  73         const char __user *buff,
  74         size_t count,
  75         loff_t *ppos)
  76 {
  77         int cnt;
  78         unsigned int data;
  79
  80         printk(KERN_INFO "%s: offset=%d count=%d *ppos=%d\n",
  81                 __func__, (int)mdp4_debug_offset, (int)count, (int)*ppos);
  82
  83         if (count > sizeof(mdp4_debug_buf))
  84                 return -EFAULT;
  85
  86         if (copy_from_user(mdp4_debug_buf, buff, count))
  87                 return -EFAULT;
  88
  89
  90         mdp4_debug_buf[count] = 0;      /* end of string */
  91
  92         cnt = sscanf(mdp4_debug_buf, "%x", &data);
  93         if (cnt < 1) {
  94                 printk(KERN_ERR "%s: sscanf failed cnt=%d" , __func__, cnt);
  95                 return -EINVAL;
  96         }
  97
  98         writel(&data, mdp4_base_addr + mdp4_debug_offset);
  99
 100         return 0;
 101 }
 102
 103 static ssize_t mdp4_debugfs_read(
 104         struct file *file,
 105         char __user *buff,
 106         size_t count,
 107         loff_t *ppos)
 108 {
 109         int len = 0;
 110         unsigned int data;
 111
 112         printk(KERN_INFO "%s: offset=%d count=%d *ppos=%d\n",
 113                 __func__, (int)mdp4_debug_offset, (int)count, (int)*ppos);
 114
 115         if (*ppos)
 116                 return 0;       /* the end */
 117
 118         data = readl(mdp4_base_addr + mdp4_debug_offset);
 119
 120         len = snprintf(mdp4_debug_buf, 4, "%x\n", data);
 121
 122         if (len > 0) {
 123                 if (len > count)
 124                         len = count;
 125                 if (copy_to_user(buff, mdp4_debug_buf, len))
 126                         return -EFAULT;
 127         }
 128
 129         printk(KERN_INFO "%s: len=%d\n", __func__, len);
 130
 131         if (len < 0)
 132                 return 0;
 133
 134         *ppos += len;   /* increase offset */
 135
 136         return len;
 137 }
 138
 139 static const struct file_operations mdp4_debugfs_fops = {
 140         .open = nonseekable_open,
 141         .release = mdp4_debugfs_release,
 142         .read = mdp4_debugfs_read,
 143         .write = mdp4_debugfs_write,
 144         .llseek = no_llseek,
 145 };
 146
 147 int mdp4_debugfs_init(void)
 148 {
 149         struct dentry *dent = debugfs_create_dir("mdp4", NULL);
 150
 151         if (IS_ERR(dent)) {
 152                 printk(KERN_ERR "%s(%d): debugfs_create_dir fail, error %ld\n",
 153                         __FILE__, __LINE__, PTR_ERR(dent));
 154                 return -1;
 155         }
 156
 157         if (debugfs_create_file("offset", 0644, dent, 0, &mdp4_offset_fops)
 158                         == NULL) {
 159                 printk(KERN_ERR "%s(%d): debugfs_create_file: offset fail\n",
 160                         __FILE__, __LINE__);
 161                 return -1;
 162         }
 163
 164         if (debugfs_create_file("regs", 0644, dent, 0, &mdp4_debugfs_fops)
 165                         == NULL) {
 166                 printk(KERN_ERR "%s(%d): debugfs_create_file: regs fail\n",
 167                         __FILE__, __LINE__);
 168                 return -1;
 169         }
 170
 171         mdp4_debug_offset = 0;
 172         mdp4_base_addr = (ulong) msm_mdp_base;  /* defined at msm_fb_def.h */
 173
 174         return 0;
 175 }