ACPM PMIC command handlers returned a u8 value when they should have returned either zero or negative error codes. Translate the APM PMIC errno to linux errno.

Reported-by: Dan Carpenter dan.carpenter@linaro.org Closes: https://lore.kernel.org/linux-input/aElHlTApXj-W_o1r@stanley.mountain/ Fixes: a88927b534ba ("firmware: add Exynos ACPM protocol driver") Cc: stable@vger.kernel.org Signed-off-by: Tudor Ambarus tudor.ambarus@linaro.org --- drivers/firmware/samsung/exynos-acpm-pmic.c | 36 +++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/samsung/exynos-acpm-pmic.c b/drivers/firmware/samsung/exynos-acpm-pmic.c index 39b33a356ebd240506b6390163229a70a2d1fe68..a355ee194027c09431f275f0fd296f45652af536 100644 --- a/drivers/firmware/samsung/exynos-acpm-pmic.c +++ b/drivers/firmware/samsung/exynos-acpm-pmic.c @@ -5,6 +5,7 @@ * Copyright 2024 Linaro Ltd. */ #include <linux/bitfield.h> +#include <linux/errno.h> #include <linux/firmware/samsung/exynos-acpm-protocol.h> #include <linux/ktime.h> #include <linux/types.h> @@ -33,6 +34,26 @@ enum exynos_acpm_pmic_func { ACPM_PMIC_BULK_WRITE, };

+enum acpm_pmic_error_codes { + ACPM_PMIC_SUCCESS = 0, + ACPM_PMIC_ERR_READ = 1, + ACPM_PMIC_ERR_WRITE = 2, + ACPM_PMIC_ERR_MAX +}; + +static int acpm_pmic_linux_errmap[ACPM_PMIC_ERR_MAX] = { + 0, /* ACPM_PMIC_SUCCESS */ + -EACCES, /* Read register can't be accessed or issues to access it. */ + -EACCES, /* Write register can't be accessed or issues to access it. */ +}; + +static inline int acpm_pmic_to_linux_errno(int errno) +{ + if (errno >= ACPM_PMIC_SUCCESS && errno < ACPM_PMIC_ERR_MAX) + return acpm_pmic_linux_errmap[errno]; + return -EIO; +} + static inline u32 acpm_pmic_set_bulk(u32 data, unsigned int i) { return (data & ACPM_PMIC_BULK_MASK) << (ACPM_PMIC_BULK_SHIFT * i); @@ -79,7 +100,8 @@ int acpm_pmic_read_reg(const struct acpm_handle *handle,

*buf = FIELD_GET(ACPM_PMIC_VALUE, xfer.rxd[1]);

- return FIELD_GET(ACPM_PMIC_RETURN, xfer.rxd[1]); + return acpm_pmic_to_linux_errno(FIELD_GET(ACPM_PMIC_RETURN, + xfer.rxd[1])); }

static void acpm_pmic_init_bulk_read_cmd(u32 cmd[4], u8 type, u8 reg, u8 chan, @@ -110,7 +132,8 @@ int acpm_pmic_bulk_read(const struct acpm_handle *handle, if (ret) return ret;

- ret = FIELD_GET(ACPM_PMIC_RETURN, xfer.rxd[1]); + ret = acpm_pmic_to_linux_errno(FIELD_GET(ACPM_PMIC_RETURN, + xfer.rxd[1])); if (ret) return ret;

@@ -150,7 +173,8 @@ int acpm_pmic_write_reg(const struct acpm_handle *handle, if (ret) return ret;

- return FIELD_GET(ACPM_PMIC_RETURN, xfer.rxd[1]); + return acpm_pmic_to_linux_errno(FIELD_GET(ACPM_PMIC_RETURN, + xfer.rxd[1])); }

static void acpm_pmic_init_bulk_write_cmd(u32 cmd[4], u8 type, u8 reg, u8 chan, @@ -190,7 +214,8 @@ int acpm_pmic_bulk_write(const struct acpm_handle *handle, if (ret) return ret;

- return FIELD_GET(ACPM_PMIC_RETURN, xfer.rxd[1]); + return acpm_pmic_to_linux_errno(FIELD_GET(ACPM_PMIC_RETURN, + xfer.rxd[1])); }

static void acpm_pmic_init_update_cmd(u32 cmd[4], u8 type, u8 reg, u8 chan, @@ -220,5 +245,6 @@ int acpm_pmic_update_reg(const struct acpm_handle *handle, if (ret) return ret;

- return FIELD_GET(ACPM_PMIC_RETURN, xfer.rxd[1]); + return acpm_pmic_to_linux_errno(FIELD_GET(ACPM_PMIC_RETURN, + xfer.rxd[1])); }

--- base-commit: c17b750b3ad9f45f2b6f7e6f7f4679844244f0b9 change-id: 20250820-acpm-pmix-fix-errno-92b3e6e17d1b

Best regards,