diff options
Diffstat (limited to 'target/linux/ipq806x/patches-4.4/019-4-nvmem-Add-backwards-compatibility-support-for-older-EEPROM-drivers.patch')
| -rw-r--r-- | target/linux/ipq806x/patches-4.4/019-4-nvmem-Add-backwards-compatibility-support-for-older-EEPROM-drivers.patch | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/target/linux/ipq806x/patches-4.4/019-4-nvmem-Add-backwards-compatibility-support-for-older-EEPROM-drivers.patch b/target/linux/ipq806x/patches-4.4/019-4-nvmem-Add-backwards-compatibility-support-for-older-EEPROM-drivers.patch deleted file mode 100644 index 6344d0ed03..0000000000 --- a/target/linux/ipq806x/patches-4.4/019-4-nvmem-Add-backwards-compatibility-support-for-older-EEPROM-drivers.patch +++ /dev/null @@ -1,181 +0,0 @@ -From b6c217ab9be6895384cf0b284ace84ad79e5c53b Mon Sep 17 00:00:00 2001 -From: Andrew Lunn <andrew@lunn.ch> -Date: Fri, 26 Feb 2016 20:59:19 +0100 -Subject: nvmem: Add backwards compatibility support for older EEPROM drivers. - -Older drivers made an 'eeprom' file available in the /sys device -directory. Have the NVMEM core provide this to retain backwards -compatibility. - -Signed-off-by: Andrew Lunn <andrew@lunn.ch> -Acked-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> -Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> ---- - drivers/nvmem/core.c | 84 ++++++++++++++++++++++++++++++++++++++---- - include/linux/nvmem-provider.h | 4 +- - 2 files changed, 79 insertions(+), 9 deletions(-) - ---- a/drivers/nvmem/core.c -+++ b/drivers/nvmem/core.c -@@ -38,8 +38,13 @@ struct nvmem_device { - int users; - size_t size; - bool read_only; -+ int flags; -+ struct bin_attribute eeprom; -+ struct device *base_dev; - }; - -+#define FLAG_COMPAT BIT(0) -+ - struct nvmem_cell { - const char *name; - int offset; -@@ -56,16 +61,26 @@ static DEFINE_IDA(nvmem_ida); - static LIST_HEAD(nvmem_cells); - static DEFINE_MUTEX(nvmem_cells_mutex); - -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+static struct lock_class_key eeprom_lock_key; -+#endif -+ - #define to_nvmem_device(d) container_of(d, struct nvmem_device, dev) - - static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj, - struct bin_attribute *attr, - char *buf, loff_t pos, size_t count) - { -- struct device *dev = container_of(kobj, struct device, kobj); -- struct nvmem_device *nvmem = to_nvmem_device(dev); -+ struct device *dev; -+ struct nvmem_device *nvmem; - int rc; - -+ if (attr->private) -+ dev = attr->private; -+ else -+ dev = container_of(kobj, struct device, kobj); -+ nvmem = to_nvmem_device(dev); -+ - /* Stop the user from reading */ - if (pos >= nvmem->size) - return 0; -@@ -90,10 +105,16 @@ static ssize_t bin_attr_nvmem_write(stru - struct bin_attribute *attr, - char *buf, loff_t pos, size_t count) - { -- struct device *dev = container_of(kobj, struct device, kobj); -- struct nvmem_device *nvmem = to_nvmem_device(dev); -+ struct device *dev; -+ struct nvmem_device *nvmem; - int rc; - -+ if (attr->private) -+ dev = attr->private; -+ else -+ dev = container_of(kobj, struct device, kobj); -+ nvmem = to_nvmem_device(dev); -+ - /* Stop the user from writing */ - if (pos >= nvmem->size) - return 0; -@@ -349,6 +370,43 @@ err: - return rval; - } - -+/* -+ * nvmem_setup_compat() - Create an additional binary entry in -+ * drivers sys directory, to be backwards compatible with the older -+ * drivers/misc/eeprom drivers. -+ */ -+static int nvmem_setup_compat(struct nvmem_device *nvmem, -+ const struct nvmem_config *config) -+{ -+ int rval; -+ -+ if (!config->base_dev) -+ return -EINVAL; -+ -+ if (nvmem->read_only) -+ nvmem->eeprom = bin_attr_ro_root_nvmem; -+ else -+ nvmem->eeprom = bin_attr_rw_root_nvmem; -+ nvmem->eeprom.attr.name = "eeprom"; -+ nvmem->eeprom.size = nvmem->size; -+#ifdef CONFIG_DEBUG_LOCK_ALLOC -+ nvmem->eeprom.attr.key = &eeprom_lock_key; -+#endif -+ nvmem->eeprom.private = &nvmem->dev; -+ nvmem->base_dev = config->base_dev; -+ -+ rval = device_create_bin_file(nvmem->base_dev, &nvmem->eeprom); -+ if (rval) { -+ dev_err(&nvmem->dev, -+ "Failed to create eeprom binary file %d\n", rval); -+ return rval; -+ } -+ -+ nvmem->flags |= FLAG_COMPAT; -+ -+ return 0; -+} -+ - /** - * nvmem_register() - Register a nvmem device for given nvmem_config. - * Also creates an binary entry in /sys/bus/nvmem/devices/dev-name/nvmem -@@ -416,16 +474,23 @@ struct nvmem_device *nvmem_register(cons - dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", config->name); - - rval = device_add(&nvmem->dev); -- if (rval) { -- ida_simple_remove(&nvmem_ida, nvmem->id); -- kfree(nvmem); -- return ERR_PTR(rval); -+ if (rval) -+ goto out; -+ -+ if (config->compat) { -+ rval = nvmem_setup_compat(nvmem, config); -+ if (rval) -+ goto out; - } - - if (config->cells) - nvmem_add_cells(nvmem, config); - - return nvmem; -+out: -+ ida_simple_remove(&nvmem_ida, nvmem->id); -+ kfree(nvmem); -+ return ERR_PTR(rval); - } - EXPORT_SYMBOL_GPL(nvmem_register); - -@@ -445,6 +510,9 @@ int nvmem_unregister(struct nvmem_device - } - mutex_unlock(&nvmem_mutex); - -+ if (nvmem->flags & FLAG_COMPAT) -+ device_remove_bin_file(nvmem->base_dev, &nvmem->eeprom); -+ - nvmem_device_remove_all_cells(nvmem); - device_del(&nvmem->dev); - ---- a/include/linux/nvmem-provider.h -+++ b/include/linux/nvmem-provider.h -@@ -24,6 +24,9 @@ struct nvmem_config { - int ncells; - bool read_only; - bool root_only; -+ /* To be only used by old driver/misc/eeprom drivers */ -+ bool compat; -+ struct device *base_dev; - }; - - #if IS_ENABLED(CONFIG_NVMEM) -@@ -44,5 +47,4 @@ static inline int nvmem_unregister(struc - } - - #endif /* CONFIG_NVMEM */ -- - #endif /* ifndef _LINUX_NVMEM_PROVIDER_H */ |