The gpio_chip label is useful for userspace to understand what kind of GPIO chip it is dealing with. Let's store a copy of this label in the gpio_device, add it to the struct passed to userspace for GPIO_GET_CHIPINFO_IOCTL and modify lsgpio to show it.
Unified · Split
| @@ -342,6 +342,9 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) · 341 unmodified lines | ||
| 342 | 342 | strncpy(chipinfo.name, dev_name(&gdev->dev), |
| 343 | 343 | sizeof(chipinfo.name)); |
| 344 | 344 | chipinfo.name[sizeof(chipinfo.name)-1] = '\0'; |
| 345 | + strncpy(chipinfo.label, gdev->label, | |
| 346 | + sizeof(chipinfo.label)); | |
| 347 | + chipinfo.label[sizeof(chipinfo.label)-1] = '\0'; | |
| 345 | 348 | chipinfo.lines = gdev->ngpio; |
| 346 | 349 | if (copy_to_user(ip, &chipinfo, sizeof(chipinfo))) |
| 347 | 350 | return -EFAULT; |
| @@ -479,6 +482,16 @@ int gpiochip_add_data(struct gpio_chip *chip, void *data) · 131 unmodified lines | ||
| 479 | 482 | status = -EINVAL; |
| 480 | 483 | goto err_free_gdev; |
| 481 | 484 | } |
| 485 | + | |
| 486 | + if (chip->label) | |
| 487 | + gdev->label = devm_kstrdup(&gdev->dev, chip->label, GFP_KERNEL); | |
| 488 | + else | |
| 489 | + gdev->label = devm_kstrdup(&gdev->dev, "unknown", GFP_KERNEL); | |
| 490 | + if (!gdev->label) { | |
| 491 | + status = -ENOMEM; | |
| 492 | + goto err_free_gdev; | |
| 493 | + } | |
| 494 | + | |
| 482 | 495 | gdev->ngpio = chip->ngpio; |
| 483 | 496 | gdev->data = data; |
| 484 | 497 | |
| @@ -37,6 +37,8 @@ struct acpi_device; · 36 unmodified lines | ||
| 37 | 37 | * of the @descs array. |
| 38 | 38 | * @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned |
| 39 | 39 | * at device creation time. |
| 40 | + * @label: a descriptive name for the GPIO device, such as the part number | |
| 41 | + * or name of the IP component in a System on Chip. | |
| 40 | 42 | * @data: per-instance data assigned by the driver |
| 41 | 43 | * @list: links gpio_device:s together for traversal |
| 42 | 44 | * |
| @@ -55,6 +57,7 @@ struct gpio_device { · 12 unmodified lines | ||
| 55 | 57 | struct gpio_desc *descs; |
| 56 | 58 | int base; |
| 57 | 59 | u16 ngpio; |
| 60 | + char *label; | |
| 58 | 61 | void *data; |
| 59 | 62 | struct list_head list; |
| 60 | 63 | |
| @@ -21,7 +21,8 @@ struct gpio_device; · 20 unmodified lines | ||
| 21 | 21 | |
| 22 | 22 | /** |
| 23 | 23 | * struct gpio_chip - abstract a GPIO controller |
| 24 | − * @label: for diagnostics | |
| 24 | + * @label: a functional name for the GPIO device, such as a part | |
| 25 | + * number or the name of the SoC IP-block implementing it. | |
| 25 | 26 | * @gpiodev: the internal state holder, opaque struct |
| 26 | 27 | * @parent: optional parent device providing the GPIOs |
| 27 | 28 | * @owner: helps prevent removal of modules exporting active GPIOs |
| @@ -16,10 +16,12 @@ · 15 unmodified lines | ||
| 16 | 16 | /** |
| 17 | 17 | * struct gpiochip_info - Information about a certain GPIO chip |
| 18 | 18 | * @name: the name of this GPIO chip |
| 19 | + * @label: a functional name for this GPIO chip | |
| 19 | 20 | * @lines: number of GPIO lines on this chip |
| 20 | 21 | */ |
| 21 | 22 | struct gpiochip_info { |
| 22 | 23 | char name[32]; |
| 24 | + char label[32]; | |
| 23 | 25 | __u32 lines; |
| 24 | 26 | }; |
| 25 | 27 | |
| @@ -54,8 +54,8 @@ int list_device(const char *device_name) · 53 unmodified lines | ||
| 54 | 54 | |
| 55 | 55 | goto free_chrdev_name; |
| 56 | 56 | } |
| 57 | − fprintf(stdout, "GPIO chip: %s, %u GPIO lines\n", | |
| 58 | − cinfo.name, cinfo.lines); | |
| 57 | + fprintf(stdout, "GPIO chip: %s, \"%s\", %u GPIO lines\n", | |
| 58 | + cinfo.name, cinfo.label, cinfo.lines); | |
| 59 | 59 | |
| 60 | 60 | if (close(fd) == -1) { |
| 61 | 61 | ret = -errno; |