diff options
Diffstat (limited to 'drivers/of/base.c')
| -rw-r--r-- | drivers/of/base.c | 171 |
1 files changed, 119 insertions, 52 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c index 3ce69536a7b3..a0bccb54a9bd 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1146,16 +1146,18 @@ EXPORT_SYMBOL_GPL(of_property_count_elems_of_size); * * @np: device node from which the property value is to be read. * @propname: name of the property to be searched. - * @len: requested length of property value + * @min: minimum allowed length of property value + * @max: maximum allowed length of property value (0 means unlimited) + * @len: if !=NULL, actual length is written to here * * Search for a property in a device node and valid the requested size. * Returns the property value on success, -EINVAL if the property does not * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the - * property data isn't large enough. + * property data is too small or too large. * */ static void *of_find_property_value_of_size(const struct device_node *np, - const char *propname, u32 len) + const char *propname, u32 min, u32 max, size_t *len) { struct property *prop = of_find_property(np, propname, NULL); @@ -1163,9 +1165,14 @@ static void *of_find_property_value_of_size(const struct device_node *np, return ERR_PTR(-EINVAL); if (!prop->value) return ERR_PTR(-ENODATA); - if (len > prop->length) + if (prop->length < min) + return ERR_PTR(-EOVERFLOW); + if (max && prop->length > max) return ERR_PTR(-EOVERFLOW); + if (len) + *len = prop->length; + return prop->value; } @@ -1189,7 +1196,9 @@ int of_property_read_u32_index(const struct device_node *np, u32 index, u32 *out_value) { const u32 *val = of_find_property_value_of_size(np, propname, - ((index + 1) * sizeof(*out_value))); + ((index + 1) * sizeof(*out_value)), + 0, + NULL); if (IS_ERR(val)) return PTR_ERR(val); @@ -1200,102 +1209,145 @@ int of_property_read_u32_index(const struct device_node *np, EXPORT_SYMBOL_GPL(of_property_read_u32_index); /** - * of_property_read_u8_array - Find and read an array of u8 from a property. + * of_property_read_variable_u8_array - Find and read an array of u8 from a + * property, with bounds on the minimum and maximum array size. * * @np: device node from which the property value is to be read. * @propname: name of the property to be searched. * @out_values: pointer to return value, modified only if return value is 0. - * @sz: number of array elements to read + * @sz_min: minimum number of array elements to read + * @sz_max: maximum number of array elements to read, if zero there is no + * upper limit on the number of elements in the dts entry but only + * sz_min will be read. * * Search for a property in a device node and read 8-bit value(s) from - * it. Returns 0 on success, -EINVAL if the property does not exist, - * -ENODATA if property does not have a value, and -EOVERFLOW if the - * property data isn't large enough. + * it. Returns number of elements read on success, -EINVAL if the property + * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW + * if the property data is smaller than sz_min or longer than sz_max. * * dts entry of array should be like: * property = /bits/ 8 <0x50 0x60 0x70>; * * The out_values is modified only if a valid u8 value can be decoded. */ -int of_property_read_u8_array(const struct device_node *np, - const char *propname, u8 *out_values, size_t sz) +int of_property_read_variable_u8_array(const struct device_node *np, + const char *propname, u8 *out_values, + size_t sz_min, size_t sz_max) { + size_t sz, count; const u8 *val = of_find_property_value_of_size(np, propname, - (sz * sizeof(*out_values))); + (sz_min * sizeof(*out_values)), + (sz_max * sizeof(*out_values)), + &sz); if (IS_ERR(val)) return PTR_ERR(val); - while (sz--) + if (!sz_max) + sz = sz_min; + else + sz /= sizeof(*out_values); + + count = sz; + while (count--) *out_values++ = *val++; - return 0; + + return sz; } -EXPORT_SYMBOL_GPL(of_property_read_u8_array); +EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array); /** - * of_property_read_u16_array - Find and read an array of u16 from a property. + * of_property_read_variable_u16_array - Find and read an array of u16 from a + * property, with bounds on the minimum and maximum array size. * * @np: device node from which the property value is to be read. * @propname: name of the property to be searched. * @out_values: pointer to return value, modified only if return value is 0. - * @sz: number of array elements to read + * @sz_min: minimum number of array elements to read + * @sz_max: maximum number of array elements to read, if zero there is no + * upper limit on the number of elements in the dts entry but only + * sz_min will be read. * * Search for a property in a device node and read 16-bit value(s) from - * it. Returns 0 on success, -EINVAL if the property does not exist, - * -ENODATA if property does not have a value, and -EOVERFLOW if the - * property data isn't large enough. + * it. Returns number of elements read on success, -EINVAL if the property + * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW + * if the property data is smaller than sz_min or longer than sz_max. * * dts entry of array should be like: * property = /bits/ 16 <0x5000 0x6000 0x7000>; * * The out_values is modified only if a valid u16 value can be decoded. */ -int of_property_read_u16_array(const struct device_node *np, - const char *propname, u16 *out_values, size_t sz) +int of_property_read_variable_u16_array(const struct device_node *np, + const char *propname, u16 *out_values, + size_t sz_min, size_t sz_max) { + size_t sz, count; const __be16 *val = of_find_property_value_of_size(np, propname, - (sz * sizeof(*out_values))); + (sz_min * sizeof(*out_values)), + (sz_max * sizeof(*out_values)), + &sz); if (IS_ERR(val)) return PTR_ERR(val); - while (sz--) + if (!sz_max) + sz = sz_min; + else + sz /= sizeof(*out_values); + + count = sz; + while (count--) *out_values++ = be16_to_cpup(val++); - return 0; + + return sz; } -EXPORT_SYMBOL_GPL(of_property_read_u16_array); +EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array); /** - * of_property_read_u32_array - Find and read an array of 32 bit integers - * from a property. + * of_property_read_variable_u32_array - Find and read an array of 32 bit + * integers from a property, with bounds on the minimum and maximum array size. * * @np: device node from which the property value is to be read. * @propname: name of the property to be searched. * @out_values: pointer to return value, modified only if return value is 0. - * @sz: number of array elements to read + * @sz_min: minimum number of array elements to read + * @sz_max: maximum number of array elements to read, if zero there is no + * upper limit on the number of elements in the dts entry but only + * sz_min will be read. * * Search for a property in a device node and read 32-bit value(s) from - * it. Returns 0 on success, -EINVAL if the property does not exist, - * -ENODATA if property does not have a value, and -EOVERFLOW if the - * property data isn't large enough. + * it. Returns number of elements read on success, -EINVAL if the property + * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW + * if the property data is smaller than sz_min or longer than sz_max. * * The out_values is modified only if a valid u32 value can be decoded. */ -int of_property_read_u32_array(const struct device_node *np, +int of_property_read_variable_u32_array(const struct device_node *np, const char *propname, u32 *out_values, - size_t sz) + size_t sz_min, size_t sz_max) { + size_t sz, count; const __be32 *val = of_find_property_value_of_size(np, propname, - (sz * sizeof(*out_values))); + (sz_min * sizeof(*out_values)), + (sz_max * sizeof(*out_values)), + &sz); if (IS_ERR(val)) return PTR_ERR(val); - while (sz--) + if (!sz_max) + sz = sz_min; + else + sz /= sizeof(*out_values); + + count = sz; + while (count--) *out_values++ = be32_to_cpup(val++); - return 0; + + return sz; } -EXPORT_SYMBOL_GPL(of_property_read_u32_array); +EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array); /** * of_property_read_u64 - Find and read a 64 bit integer from a property @@ -1314,7 +1366,9 @@ int of_property_read_u64(const struct device_node *np, const char *propname, u64 *out_value) { const __be32 *val = of_find_property_value_of_size(np, propname, - sizeof(*out_value)); + sizeof(*out_value), + 0, + NULL); if (IS_ERR(val)) return PTR_ERR(val); @@ -1325,38 +1379,51 @@ int of_property_read_u64(const struct device_node *np, const char *propname, EXPORT_SYMBOL_GPL(of_property_read_u64); /** - * of_property_read_u64_array - Find and read an array of 64 bit integers - * from a property. + * of_property_read_variable_u64_array - Find and read an array of 64 bit + * integers from a property, with bounds on the minimum and maximum array size. * * @np: device node from which the property value is to be read. * @propname: name of the property to be searched. * @out_values: pointer to return value, modified only if return value is 0. - * @sz: number of array elements to read + * @sz_min: minimum number of array elements to read + * @sz_max: maximum number of array elements to read, if zero there is no + * upper limit on the number of elements in the dts entry but only + * sz_min will be read. * * Search for a property in a device node and read 64-bit value(s) from - * it. Returns 0 on success, -EINVAL if the property does not exist, - * -ENODATA if property does not have a value, and -EOVERFLOW if the - * property data isn't large enough. + * it. Returns number of elements read on success, -EINVAL if the property + * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW + * if the property data is smaller than sz_min or longer than sz_max. * * The out_values is modified only if a valid u64 value can be decoded. */ -int of_property_read_u64_array(const struct device_node *np, +int of_property_read_variable_u64_array(const struct device_node *np, const char *propname, u64 *out_values, - size_t sz) + size_t sz_min, size_t sz_max) { + size_t sz, count; const __be32 *val = of_find_property_value_of_size(np, propname, - (sz * sizeof(*out_values))); + (sz_min * sizeof(*out_values)), + (sz_max * sizeof(*out_values)), + &sz); if (IS_ERR(val)) return PTR_ERR(val); - while (sz--) { + if (!sz_max) + sz = sz_min; + else + sz /= sizeof(*out_values); + + count = sz; + while (count--) { *out_values++ = of_read_number(val, 2); val += 2; } - return 0; + + return sz; } -EXPORT_SYMBOL_GPL(of_property_read_u64_array); +EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array); /** * of_property_read_string - Find and read a string from a property |