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nvmem: rockchip-otp: Add magic-number for enable otp write func

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This patch add magic for enable otp write func to avoid unexpected written.

e.g.:

echo 1380926283 > /sys/module/nvmem_rockchip_otp/parameters/rockchip_otp_wr_magic

Signed-off-by: Sugar Zhang <sugar.zhang@rock-chips.com>
Change-Id: I0d2d5fe97de4f69f2a30142d62a21e17d818d98f
This commit is contained in:
Sugar Zhang
2020-10-05 17:53:44 +08:00
committed by Tao Huang
parent 57116bb96f
commit 6ac3f5e46b
1 changed files with 10 additions and 1 deletions
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11
drivers/nvmem/rockchip-otp.c
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@@ -70,6 +70,12 @@
#define RV1126_OTP_NVM_PRSTART 0x44
#define RV1126_OTP_NVM_PRSTATE 0x48
#define ROCKCHIP_OTP_WR_MAGIC (0x524F434B)
static unsigned int rockchip_otp_wr_magic;
module_param(rockchip_otp_wr_magic, uint, 0644);
MODULE_PARM_DESC(rockchip_otp_wr_magic, "magic for enable otp write func.");
struct rockchip_data;
struct rockchip_otp {
@@ -328,8 +334,11 @@ static int rockchip_otp_write(void *context, unsigned int offset, void *val,
int ret = -EINVAL;
mutex_lock(&otp->mutex);
if (otp->data && otp->data->reg_write)
if (rockchip_otp_wr_magic == ROCKCHIP_OTP_WR_MAGIC &&
otp->data && otp->data->reg_write) {
ret = otp->data->reg_write(context, offset, val, bytes);
rockchip_otp_wr_magic = 0;
}
mutex_unlock(&otp->mutex);
return ret;