From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org,
Michael Auchter <michael.auchter@ni.com>,
Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: [PATCH 2/3] nvmem: ensure sysfs writes handle write-protect pin
Date: Mon, 11 May 2020 15:50:41 +0100 [thread overview]
Message-ID: <20200511145042.31223-3-srinivas.kandagatla@linaro.org> (raw)
In-Reply-To: <20200511145042.31223-1-srinivas.kandagatla@linaro.org>
From: Michael Auchter <michael.auchter@ni.com>
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>
---
drivers/nvmem/core.c | 52 ++++++++++++++++++++++----------------------
1 file 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);
--
2.21.0
next prev parent reply other threads:[~2020-05-11 14:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-11 14:50 [PATCH 0/3] nvmem: patches for 5.8 Srinivas Kandagatla
2020-05-11 14:50 ` [PATCH 1/3] nvmem: imx-ocotp: Improve logic to save many code lines Srinivas Kandagatla
2020-05-11 14:50 ` Srinivas Kandagatla [this message]
2020-05-11 14:50 ` [PATCH 3/3] nvmem: jz4780-efuse: Use PTR_ERR_OR_ZERO() to simplify code Srinivas Kandagatla
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