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*参照元 [#ef2b5919] #backlinks *説明 [#pc72cba3] -パス: [[linux-4.4.1/]] -パス: [[linux-4.4.1/drivers/gpio/gpiolib.c]] -FIXME: これは何？ --説明 **引数 [#d401e8e4] -struct gpio_chip *chip -- --[[linux-4.4.1/gpio_chip]] -const char *pinctl_name -- -unsigned int gpio_offset -- -unsigned int pin_offset -- -unsigned int npins -- **返り値 [#v0e46793] -int -- **参考 [#a7f33214] *実装 [#rf1b1181] /** * gpiochip_add_pin_range() - add a range for GPIO <-> pin mapping * @chip: the gpiochip to add the range for * @pinctrl_name: the dev_name() of the pin controller to map to * @gpio_offset: the start offset in the current gpio_chip number space * @pin_offset: the start offset in the pin controller number space * @npins: the number of pins from the offset of each pin space (GPIO and * pin controller) to accumulate in this range */ int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name, unsigned int gpio_offset, unsigned int pin_offset, unsigned int npins) { struct gpio_pin_range *pin_range; int ret; - --[[linux-4.4.1/gpio_pin_range]] pin_range = kzalloc(sizeof(*pin_range), GFP_KERNEL); if (!pin_range) { chip_err(chip, "failed to allocate pin ranges\n"); return -ENOMEM; } - --[[linux-4.4.1/kzalloc()]] --[[linux-4.4.1/chip_err()]] /* Use local offset as range ID */ pin_range->range.id = gpio_offset; pin_range->range.gc = chip; pin_range->range.name = chip->label; pin_range->range.base = chip->base + gpio_offset; pin_range->range.pin_base = pin_offset; pin_range->range.npins = npins; pin_range->pctldev = pinctrl_find_and_add_gpio_range(pinctl_name, &pin_range->range); if (IS_ERR(pin_range->pctldev)) { ret = PTR_ERR(pin_range->pctldev); chip_err(chip, "could not create pin range\n"); kfree(pin_range); return ret; } chip_dbg(chip, "created GPIO range %d->%d ==> %s PIN %d->%d\n", gpio_offset, gpio_offset + npins - 1, pinctl_name, pin_offset, pin_offset + npins - 1); - --[[linux-4.4.1/pinctrl_find_and_add_gpio_range()]] --[[linux-4.4.1/IS_ERR()]] --[[linux-4.4.1/PTR_ERR()]] --[[linux-4.4.1/chip_err()]] --[[linux-4.4.1/kfree()]] --[[linux-4.4.1/chip_dbg()]] list_add_tail(&pin_range->node, &chip->pin_ranges); - --[[linux-4.4.1/list_add_tail()]] return 0; } EXPORT_SYMBOL_GPL(gpiochip_add_pin_range); - --[[linux-4.4.1/EXPORT_SYMBOL_GPL()]] *コメント [#f12a74c1]
