diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/parameter.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/lib/parameter.c b/lib/parameter.c index 70f035aab3..3e78c96728 100644 --- a/lib/parameter.c +++ b/lib/parameter.c @@ -27,6 +27,7 @@ #include <net.h> #include <malloc.h> #include <driver.h> +#include <linux/err.h> struct param_d *get_param_by_name(struct device_d *dev, const char *name) { @@ -218,6 +219,166 @@ int dev_add_param_fixed(struct device_d *dev, char *name, char *value) return 0; } +struct param_int { + struct param_d param; + int *value; + const char *format; +#define PARAM_INT_FLAG_BOOL (1 << 0) + unsigned flags; + int (*set)(struct param_d *p, void *priv); + int (*get)(struct param_d *p, void *priv); +}; + +static inline struct param_int *to_param_int(struct param_d *p) +{ + return container_of(p, struct param_int, param); +} + +static int param_int_set(struct device_d *dev, struct param_d *p, const char *val) +{ + struct param_int *pi = to_param_int(p); + int value_save = *pi->value; + int ret; + + if (!val) + return -EINVAL; + + *pi->value = simple_strtol(val, NULL, 0); + if (pi->flags & PARAM_INT_FLAG_BOOL) + *pi->value = !!*pi->value; + + if (pi->set) { + ret = pi->set(p, p->driver_priv); + if (ret) { + *pi->value = value_save; + return ret; + } + } + + return 0; +} + +static const char *param_int_get(struct device_d *dev, struct param_d *p) +{ + struct param_int *pi = to_param_int(p); + int ret; + + if (pi->get) { + ret = pi->get(p, p->driver_priv); + if (ret) + return NULL; + } + + free(p->value); + p->value = asprintf(pi->format, *pi->value); + + return p->value; +} + +/** + * dev_add_param_int - add an integer parameter to a device + * @param dev The device + * @param name The name of the parameter + * @param set set function + * @param get get function + * @param value pointer to the integer containing the value of the parameter + * @param format the printf format used to print the value + * @param priv user private data, will be passed to get/set + * + * The get function can be used as a notifier when the variable is about + * to be read. + * The set function can be used as a notifer when the variable is about + * to be written. Can also be used to limit the value. + */ +struct param_d *dev_add_param_int(struct device_d *dev, const char *name, + int (*set)(struct param_d *p, void *priv), + int (*get)(struct param_d *p, void *priv), + int *value, const char *format, void *priv) +{ + struct param_int *pi; + struct param_d *p; + int ret; + + pi = xzalloc(sizeof(*pi)); + pi->value = value; + pi->format = format; + pi->set = set; + pi->get = get; + p = &pi->param; + p->driver_priv = priv; + + ret = __dev_add_param(p, dev, name, param_int_set, param_int_get, 0); + if (ret) { + free(pi); + return ERR_PTR(ret); + } + + return &pi->param; +} + +/** + * dev_add_param_bool - add an boolean parameter to a device + * @param dev The device + * @param name The name of the parameter + * @param set set function + * @param get get function + * @param value pointer to the integer containing the value of the parameter + * @param priv user private data, will be passed to get/set + * + * The get function can be used as a notifier when the variable is about + * to be read. + * The set function can be used as a notifer when the variable is about + * to be written. Can also be used to limit the value. + */ +struct param_d *dev_add_param_bool(struct device_d *dev, const char *name, + int (*set)(struct param_d *p, void *priv), + int (*get)(struct param_d *p, void *priv), + int *value, void *priv) +{ + struct param_int *pi; + struct param_d *p; + + p = dev_add_param_int(dev, name, set, get, value, "%d", priv); + if (IS_ERR(p)) + return p; + + pi = to_param_int(p); + pi->flags |= PARAM_INT_FLAG_BOOL; + + return p; +} + +struct param_int_ro { + struct param_d param; + char *value; +}; + +/** + * dev_add_param_int_ro - add a read only integer parameter to a device + * @param dev The device + * @param name The name of the parameter + * @param value The value of the parameter + * @param format the printf format used to print the value + */ +struct param_d *dev_add_param_int_ro(struct device_d *dev, const char *name, + int value, const char *format) +{ + struct param_int *piro; + int ret; + + piro = xzalloc(sizeof(*piro)); + + ret = __dev_add_param(&piro->param, dev, name, NULL, NULL, 0); + if (ret) { + free(piro); + return ERR_PTR(ret); + } + + piro->param.value = asprintf(format, value); + + return &piro->param; +} + /** * dev_remove_param - remove a parameter from a device and free its * memory |