From 32f4bd130c9c46ad7404a3e600dcea8d05008d32 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Wed, 16 Jul 2014 16:35:52 +0200 Subject: param: Add dev_add_param_string This function allows drivers to create a string parameter and provides access to it via a pointer. Using regular dev_add_param only allows access via dev_get_param(). Signed-off-by: Sascha Hauer --- lib/parameter.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) (limited to 'lib') diff --git a/lib/parameter.c b/lib/parameter.c index 13062bc667..84a632c34f 100644 --- a/lib/parameter.c +++ b/lib/parameter.c @@ -201,6 +201,82 @@ int dev_add_param_fixed(struct device_d *dev, char *name, const char *value) return 0; } +struct param_string { + struct param_d param; + char **value; + int (*set)(struct param_d *p, void *priv); + int (*get)(struct param_d *p, void *priv); +}; + +static inline struct param_string *to_param_string(struct param_d *p) +{ + return container_of(p, struct param_string, param); +} + +static int param_string_set(struct device_d *dev, struct param_d *p, const char *val) +{ + struct param_string *ps = to_param_string(p); + int ret; + char *value_save = *ps->value; + + if (!val) + return -EINVAL; + + *ps->value = xstrdup(val); + + if (!ps->set) + return 0; + + ret = ps->set(p, p->driver_priv); + if (ret) { + free(*ps->value); + *ps->value = value_save; + } else { + free(value_save); + } + + return ret; +} + +static const char *param_string_get(struct device_d *dev, struct param_d *p) +{ + struct param_string *ps = to_param_string(p); + int ret; + + if (ps->get) { + ret = ps->get(p, p->driver_priv); + if (ret) + return NULL; + } + + return *ps->value; +} + +struct param_d *dev_add_param_string(struct device_d *dev, const char *name, + int (*set)(struct param_d *p, void *priv), + int (*get)(struct param_d *p, void *priv), + char **value, void *priv) +{ + struct param_string *ps; + struct param_d *p; + int ret; + + ps = xzalloc(sizeof(*ps)); + ps->value = value; + ps->set = set; + ps->get = get; + p = &ps->param; + p->driver_priv = priv; + + ret = __dev_add_param(p, dev, name, param_string_set, param_string_get, 0); + if (ret) { + free(ps); + return ERR_PTR(ret); + } + + return &ps->param; +} + struct param_int { struct param_d param; int *value; -- cgit v1.2.3