diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mfd/kempld-core.c | 115 |
1 files changed, 109 insertions, 6 deletions
diff --git a/drivers/mfd/kempld-core.c b/drivers/mfd/kempld-core.c index 52bec01149e5..1dfe556df038 100644 --- a/drivers/mfd/kempld-core.c +++ b/drivers/mfd/kempld-core.c @@ -13,6 +13,7 @@ #include <linux/dmi.h> #include <linux/io.h> #include <linux/delay.h> +#include <linux/acpi.h> #define MAX_ID_LEN 4 static char force_device_id[MAX_ID_LEN + 1] = ""; @@ -124,6 +125,7 @@ static const struct kempld_platform_data kempld_platform_data_generic = { }; static struct platform_device *kempld_pdev; +static bool kempld_acpi_mode; static int kempld_create_platform_device(const struct dmi_system_id *id) { @@ -426,13 +428,93 @@ static int kempld_detect_device(struct kempld_device_data *pld) return ret; } +#ifdef CONFIG_ACPI +static int kempld_get_acpi_data(struct platform_device *pdev) +{ + struct list_head resource_list; + struct resource *resources; + struct resource_entry *rentry; + struct device *dev = &pdev->dev; + struct acpi_device *acpi_dev = ACPI_COMPANION(dev); + const struct kempld_platform_data *pdata; + int ret; + int count; + + pdata = acpi_device_get_match_data(dev); + ret = platform_device_add_data(pdev, pdata, + sizeof(struct kempld_platform_data)); + if (ret) + return ret; + + INIT_LIST_HEAD(&resource_list); + ret = acpi_dev_get_resources(acpi_dev, &resource_list, NULL, NULL); + if (ret < 0) + goto out; + + count = ret; + + if (count == 0) { + ret = platform_device_add_resources(pdev, pdata->ioresource, 1); + goto out; + } + + resources = devm_kcalloc(&acpi_dev->dev, count, sizeof(*resources), + GFP_KERNEL); + if (!resources) { + ret = -ENOMEM; + goto out; + } + + count = 0; + list_for_each_entry(rentry, &resource_list, node) { + memcpy(&resources[count], rentry->res, + sizeof(*resources)); + count++; + } + ret = platform_device_add_resources(pdev, resources, count); + +out: + acpi_dev_free_resource_list(&resource_list); + + return ret; +} +#else +static int kempld_get_acpi_data(struct platform_device *pdev) +{ + return -ENODEV; +} +#endif /* CONFIG_ACPI */ + static int kempld_probe(struct platform_device *pdev) { - const struct kempld_platform_data *pdata = - dev_get_platdata(&pdev->dev); + const struct kempld_platform_data *pdata; struct device *dev = &pdev->dev; struct kempld_device_data *pld; struct resource *ioport; + int ret; + + if (kempld_pdev == NULL) { + /* + * No kempld_pdev device has been registered in kempld_init, + * so we seem to be probing an ACPI platform device. + */ + ret = kempld_get_acpi_data(pdev); + if (ret) + return ret; + + kempld_acpi_mode = true; + } else if (kempld_pdev != pdev) { + /* + * The platform device we are probing is not the one we + * registered in kempld_init using the DMI table, so this one + * comes from ACPI. + * As we can only probe one - abort here and use the DMI + * based one instead. + */ + dev_notice(dev, "platform device exists - not using ACPI\n"); + return -ENODEV; + } + pdata = dev_get_platdata(dev); pld = devm_kzalloc(dev, sizeof(*pld), GFP_KERNEL); if (!pld) @@ -471,9 +553,17 @@ static int kempld_remove(struct platform_device *pdev) return 0; } +static const struct acpi_device_id kempld_acpi_table[] = { + { "KEM0001", (kernel_ulong_t)&kempld_platform_data_generic }, + {} +}; +MODULE_DEVICE_TABLE(acpi, kempld_acpi_table); + static struct platform_driver kempld_driver = { .driver = { .name = "kempld", + .acpi_match_table = ACPI_PTR(kempld_acpi_table), + .probe_type = PROBE_FORCE_SYNCHRONOUS, }, .probe = kempld_probe, .remove = kempld_remove, @@ -792,6 +882,7 @@ MODULE_DEVICE_TABLE(dmi, kempld_dmi_table); static int __init kempld_init(void) { const struct dmi_system_id *id; + int ret; if (force_device_id[0]) { for (id = kempld_dmi_table; @@ -801,12 +892,24 @@ static int __init kempld_init(void) break; if (id->matches[0].slot == DMI_NONE) return -ENODEV; - } else { - if (!dmi_check_system(kempld_dmi_table)) - return -ENODEV; } - return platform_driver_register(&kempld_driver); + ret = platform_driver_register(&kempld_driver); + if (ret) + return ret; + + /* + * With synchronous probing the device should already be probed now. + * If no device id is forced and also no ACPI definition for the + * device was found, scan DMI table as fallback. + * + * If drivers_autoprobing is disabled and the device is found here, + * only that device can be bound manually later. + */ + if (!kempld_pdev && !kempld_acpi_mode) + dmi_check_system(kempld_dmi_table); + + return 0; } static void __exit kempld_exit(void) |