示例#1
0
static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
				    size_t count, loff_t *ppos)
{
	int reg_len, val_len, tot_len;
	size_t buf_pos = 0;
	loff_t p = 0;
	ssize_t ret;
	int i;
	struct regmap *map = file->private_data;
	char *buf;
	unsigned int val;

	if (*ppos < 0 || !count)
		return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	/* Calculate the length of a fixed format  */
	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
	val_len = 2 * map->format.val_bytes;
	tot_len = reg_len + val_len + 3;      /* : \n */

	for (i = 0; i < map->max_register + 1; i++) {
		if (!regmap_readable(map, i))
			continue;

		if (regmap_precious(map, i))
			continue;

		/* If we're in the region the user is trying to read */
		if (p >= *ppos) {
			/* ...but not beyond it */
			if (buf_pos >= count - 1 - tot_len)
				break;

			/* Format the register */
			snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
				 reg_len, i);
			buf_pos += reg_len + 2;

			/* Format the value, write all X if we can't read */
			ret = regmap_read(map, i, &val);
			if (ret == 0)
				snprintf(buf + buf_pos, count - buf_pos,
					 "%.*x", val_len, val);
			else
				memset(buf + buf_pos, 'X', val_len);
			buf_pos += 2 * map->format.val_bytes;

			buf[buf_pos++] = '\n';
		}
		p += tot_len;
	}

	ret = buf_pos;

	if (copy_to_user(user_buf, buf, buf_pos)) {
		ret = -EFAULT;
		goto out;
	}

	*ppos += buf_pos;

out:
	kfree(buf);
	return ret;
}
static ssize_t regmap_access_read_file(struct file *file,
				       char __user *user_buf, size_t count,
				       loff_t *ppos)
{
	int reg_len, tot_len;
	size_t buf_pos = 0;
	loff_t p = 0;
	ssize_t ret;
	int i;
	struct regmap *map = file->private_data;
	char *buf;

	if (*ppos < 0 || !count)
		return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	
	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
	tot_len = reg_len + 10; 

	for (i = 0; i < map->max_register + 1; i++) {
		
		if (!regmap_readable(map, i) && !regmap_writeable(map, i))
			continue;

		
		if (p >= *ppos) {
			
			if (buf_pos >= count - 1 - tot_len)
				break;

			
			snprintf(buf + buf_pos, count - buf_pos,
				 "%.*x: %c %c %c %c\n",
				 reg_len, i,
				 regmap_readable(map, i) ? 'y' : 'n',
				 regmap_writeable(map, i) ? 'y' : 'n',
				 regmap_volatile(map, i) ? 'y' : 'n',
				 regmap_precious(map, i) ? 'y' : 'n');

			buf_pos += tot_len;
		}
		p += tot_len;
	}

	ret = buf_pos;

	if (copy_to_user(user_buf, buf, buf_pos)) {
		ret = -EFAULT;
		goto out;
	}

	*ppos += buf_pos;

out:
	kfree(buf);
	return ret;
}
示例#3
0
static ssize_t regmap_access_read_file(struct file *file,
				       char __user *user_buf, size_t count,
				       loff_t *ppos)
{
	int reg_len, tot_len;
	size_t buf_pos = 0;
	loff_t p = 0;
	ssize_t ret;
	int i;
	struct regmap *map = file->private_data;
	char *buf;

	if (*ppos < 0 || !count)
		return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	/* Calculate the length of a fixed format  */
	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
	tot_len = reg_len + 10; /* ': R W V P\n' */

	for (i = 0; i < map->max_register + 1; i++) {
		/* Ignore registers which are neither readable nor writable */
		if (!regmap_readable(map, i) && !regmap_writeable(map, i))
			continue;

		/* If we're in the region the user is trying to read */
		if (p >= *ppos) {
			/* ...but not beyond it */
			if (buf_pos >= count - 1 - tot_len)
				break;

			/* Format the register */
			snprintf(buf + buf_pos, count - buf_pos,
				 "%.*x: %c %c %c %c\n",
				 reg_len, i,
				 regmap_readable(map, i) ? 'y' : 'n',
				 regmap_writeable(map, i) ? 'y' : 'n',
				 regmap_volatile(map, i) ? 'y' : 'n',
				 regmap_precious(map, i) ? 'y' : 'n');

			buf_pos += tot_len;
		}
		p += tot_len;
	}

	ret = buf_pos;

	if (copy_to_user(user_buf, buf, buf_pos)) {
		ret = -EFAULT;
		goto out;
	}

	*ppos += buf_pos;

out:
	kfree(buf);
	return ret;
}
示例#4
0
static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
				    size_t count, loff_t *ppos)
{
	int reg_len, val_len, tot_len;
	size_t buf_pos = 0;
	loff_t p = 0;
	ssize_t ret;
	int i;
	struct regmap *map = file->private_data;
	char *buf;
	unsigned int val;

	if (*ppos < 0 || !count)
		return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	
	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
	val_len = 2 * map->format.val_bytes;
	tot_len = reg_len + val_len + 3;      

	for (i = 0; i < map->max_register + 1; i++) {
		if (!regmap_readable(map, i))
			continue;

		if (regmap_precious(map, i))
			continue;

		
		if (p >= *ppos) {
			if (buf_pos + 1 + tot_len >= count)
				break;

			
			snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
				 reg_len, i);
			buf_pos += reg_len + 2;

			
			ret = regmap_read(map, i, &val);
			if (ret == 0)
				snprintf(buf + buf_pos, count - buf_pos,
					 "%.*x", val_len, val);
			else
				memset(buf + buf_pos, 'X', val_len);
			buf_pos += 2 * map->format.val_bytes;

			buf[buf_pos++] = '\n';
		}
		p += tot_len;
	}

	ret = buf_pos;

	if (copy_to_user(user_buf, buf, buf_pos)) {
		ret = -EFAULT;
		goto out;
	}

	*ppos += buf_pos;

out:
	kfree(buf);
	return ret;
}