/**
* regcache_read: Fetch the value of a given register from the cache.
*
* @map: map to configure.
* @reg: The register index.
* @value: The value to be returned.
*
* Return a negative value on failure, 0 on success.
*/
int regcache_read(struct regmap *map,
unsigned int reg, unsigned int *value)
{
if (map->cache_type == REGCACHE_NONE)
return -ENOSYS;
BUG_ON(!map->cache_ops);
if (!regmap_readable(map, reg))
return -EIO;
if (!regmap_volatile(map, reg))
return map->cache_ops->read(map, reg, value);
return -EINVAL;
}
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;
/* 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;
}
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;
}
static int regcache_hw_init(struct regmap *map)
{
int i, j;
int ret;
int count;
unsigned int reg, val;
void *tmp_buf;
if (!map->num_reg_defaults_raw)
return -EINVAL;
/* calculate the size of reg_defaults */
for (count = 0, i = 0; i < map->num_reg_defaults_raw; i++)
if (regmap_readable(map, i * map->reg_stride) &&
!regmap_volatile(map, i * map->reg_stride))
count++;
/* all registers are unreadable or volatile, so just bypass */
if (!count) {
map->cache_bypass = true;
return 0;
}
map->num_reg_defaults = count;
map->reg_defaults = kmalloc_array(count, sizeof(struct reg_default),
GFP_KERNEL);
if (!map->reg_defaults)
return -ENOMEM;
if (!map->reg_defaults_raw) {
bool cache_bypass = map->cache_bypass;
dev_warn(map->dev, "No cache defaults, reading back from HW\n");
/* Bypass the cache access till data read from HW */
map->cache_bypass = true;
tmp_buf = kmalloc(map->cache_size_raw, GFP_KERNEL);
if (!tmp_buf) {
ret = -ENOMEM;
goto err_free;
}
ret = regmap_raw_read(map, 0, tmp_buf,
map->cache_size_raw);
map->cache_bypass = cache_bypass;
if (ret == 0) {
map->reg_defaults_raw = tmp_buf;
map->cache_free = 1;
} else {
kfree(tmp_buf);
}
}
/* fill the reg_defaults */
for (i = 0, j = 0; i < map->num_reg_defaults_raw; i++) {
reg = i * map->reg_stride;
if (!regmap_readable(map, reg))
continue;
if (regmap_volatile(map, reg))
continue;
if (map->reg_defaults_raw) {
val = regcache_get_val(map, map->reg_defaults_raw, i);
} else {
bool cache_bypass = map->cache_bypass;
map->cache_bypass = true;
ret = regmap_read(map, reg, &val);
map->cache_bypass = cache_bypass;
if (ret != 0) {
dev_err(map->dev, "Failed to read %d: %d\n",
reg, ret);
goto err_free;
}
}
map->reg_defaults[j].reg = reg;
map->reg_defaults[j].def = val;
j++;
}
return 0;
err_free:
kfree(map->reg_defaults);
return ret;
}
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;
}
