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author | Michael Auchter <michael.auchter@ni.com> | 2020-05-11 15:50:41 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-15 16:20:02 +0200 |
commit | b96fc5416b099a0c2509ca07a80b140d34db2b9b (patch) | |
tree | d9938d3ea97c41e633fb647a8ab6e5876c88171b /drivers/nvmem/core.c | |
parent | 0e2abffdf928c57af9dfb334e9aa54e430e3b424 (diff) | |
download | linux-b96fc5416b099a0c2509ca07a80b140d34db2b9b.tar.gz linux-b96fc5416b099a0c2509ca07a80b140d34db2b9b.tar.bz2 linux-b96fc5416b099a0c2509ca07a80b140d34db2b9b.zip |
nvmem: ensure sysfs writes handle write-protect pin
Commit 2a127da461a9 ("nvmem: add support for the write-protect pin")
added support for handling write-protect pins to the nvmem core, and
Commit 1c89074bf850 ("eeprom: at24: remove the write-protect pin support")
retrofitted the at24 driver to use this support.
These changes broke write() on the nvmem sysfs attribute for eeproms
which utilize a write-protect pin, as the write callback invokes the
nvmem device's reg_write callback directly which no longer handles
changing the state of the write-protect pin.
Change the read and write callbacks for the sysfs attribute to invoke
nvmme_reg_read/nvmem_reg_write helpers which handle this, rather than
calling reg_read/reg_write directly.
Fixes: 2a127da461a9 ("nvmem: add support for the write-protect pin")
Signed-off-by: Michael Auchter <michael.auchter@ni.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200511145042.31223-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvmem/core.c')
-rw-r--r-- | drivers/nvmem/core.c | 52 |
1 files changed, 26 insertions, 26 deletions
diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c index ad6e55a75bdb..927eb5f6003f 100644 --- a/drivers/nvmem/core.c +++ b/drivers/nvmem/core.c @@ -66,6 +66,30 @@ static LIST_HEAD(nvmem_lookup_list); static BLOCKING_NOTIFIER_HEAD(nvmem_notifier); +static int nvmem_reg_read(struct nvmem_device *nvmem, unsigned int offset, + void *val, size_t bytes) +{ + if (nvmem->reg_read) + return nvmem->reg_read(nvmem->priv, offset, val, bytes); + + return -EINVAL; +} + +static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset, + void *val, size_t bytes) +{ + int ret; + + if (nvmem->reg_write) { + gpiod_set_value_cansleep(nvmem->wp_gpio, 0); + ret = nvmem->reg_write(nvmem->priv, offset, val, bytes); + gpiod_set_value_cansleep(nvmem->wp_gpio, 1); + return ret; + } + + return -EINVAL; +} + #ifdef CONFIG_NVMEM_SYSFS static const char * const nvmem_type_str[] = { [NVMEM_TYPE_UNKNOWN] = "Unknown", @@ -122,7 +146,7 @@ static ssize_t bin_attr_nvmem_read(struct file *filp, struct kobject *kobj, if (!nvmem->reg_read) return -EPERM; - rc = nvmem->reg_read(nvmem->priv, pos, buf, count); + rc = nvmem_reg_read(nvmem, pos, buf, count); if (rc) return rc; @@ -159,7 +183,7 @@ static ssize_t bin_attr_nvmem_write(struct file *filp, struct kobject *kobj, if (!nvmem->reg_write) return -EPERM; - rc = nvmem->reg_write(nvmem->priv, pos, buf, count); + rc = nvmem_reg_write(nvmem, pos, buf, count); if (rc) return rc; @@ -287,30 +311,6 @@ static void nvmem_sysfs_remove_compat(struct nvmem_device *nvmem, #endif /* CONFIG_NVMEM_SYSFS */ -static int nvmem_reg_read(struct nvmem_device *nvmem, unsigned int offset, - void *val, size_t bytes) -{ - if (nvmem->reg_read) - return nvmem->reg_read(nvmem->priv, offset, val, bytes); - - return -EINVAL; -} - -static int nvmem_reg_write(struct nvmem_device *nvmem, unsigned int offset, - void *val, size_t bytes) -{ - int ret; - - if (nvmem->reg_write) { - gpiod_set_value_cansleep(nvmem->wp_gpio, 0); - ret = nvmem->reg_write(nvmem->priv, offset, val, bytes); - gpiod_set_value_cansleep(nvmem->wp_gpio, 1); - return ret; - } - - return -EINVAL; -} - static void nvmem_release(struct device *dev) { struct nvmem_device *nvmem = to_nvmem_device(dev); |