/* the volume keys can be the wakeup keys in special case */ static ssize_t wakeup_enable(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct gpio_keys_drvdata *ddata = dev_get_drvdata(dev); int n_events = get_n_events_by_type(EV_KEY); unsigned long *bits; ssize_t error; int i; bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); if (!bits) return -ENOMEM; error = bitmap_parselist(buf, bits, n_events); if (error) goto out; for (i = 0; i < ddata->n_buttons; i++) { struct gpio_button_data *button = &ddata->data[i]; if (test_bit(button->button->code, bits)) button->button->wakeup = 1; else button->button->wakeup = 0; } out: kfree(bits); return count; }
/** * gpio_keys_attr_show_helper() - fill in stringified bitmap of buttons * @ddata: pointer to drvdata * @buf: buffer where stringified bitmap is written * @type: button type (%EV_KEY, %EV_SW) * @only_disabled: does caller want only those buttons that are * currently disabled or all buttons that can be * disabled * * This function writes buttons that can be disabled to @buf. If * @only_disabled is true, then @buf contains only those buttons * that are currently disabled. Returns 0 on success or negative * errno on failure. */ static ssize_t gpio_keys_attr_show_helper(struct gpio_keys_drvdata *ddata, char *buf, unsigned int type, bool only_disabled) { int n_events = get_n_events_by_type(type); unsigned long *bits; ssize_t ret; int i; bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); if (!bits) return -ENOMEM; for (i = 0; i < ddata->n_buttons; i++) { struct gpio_button_data *bdata = &ddata->data[i]; if (bdata->button->type != type) continue; if (only_disabled && !bdata->disabled) continue; __set_bit(bdata->button->code, bits); } ret = bitmap_scnlistprintf(buf, PAGE_SIZE - 2, bits, n_events); buf[ret++] = '\n'; buf[ret] = '\0'; kfree(bits); return ret; }
/** * gpio_keys_attr_store_helper() - enable/disable buttons based on given bitmap * @ddata: pointer to drvdata * @buf: buffer from userspace that contains stringified bitmap * @type: button type (%EV_KEY, %EV_SW) * * This function parses stringified bitmap from @buf and disables/enables * GPIO buttons accordingly. Returns 0 on success and negative error * on failure. */ static ssize_t gpio_keys_attr_store_helper(struct gpio_keys_drvdata *ddata, const char *buf, unsigned int type) { int n_events = get_n_events_by_type(type); const unsigned long *bitmap = get_bm_events_by_type(ddata->input, type); unsigned long *bits; ssize_t error; int i; bits = kcalloc(BITS_TO_LONGS(n_events), sizeof(*bits), GFP_KERNEL); if (!bits) return -ENOMEM; error = bitmap_parselist(buf, bits, n_events); if (error) goto out; /* First validate */ if (!bitmap_subset(bits, bitmap, n_events)) { error = -EINVAL; goto out; } for (i = 0; i < ddata->pdata->nbuttons; i++) { struct gpio_button_data *bdata = &ddata->data[i]; if (bdata->button->type != type) continue; if (test_bit(*bdata->code, bits) && !bdata->button->can_disable) { error = -EINVAL; goto out; } } mutex_lock(&ddata->disable_lock); for (i = 0; i < ddata->pdata->nbuttons; i++) { struct gpio_button_data *bdata = &ddata->data[i]; if (bdata->button->type != type) continue; if (test_bit(*bdata->code, bits)) gpio_keys_disable_button(bdata); else gpio_keys_enable_button(bdata); } mutex_unlock(&ddata->disable_lock); out: kfree(bits); return error; }