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Subject[PATCH 4.4 029/160] pinctrl: spmi-mpp: Fix pmic_mpp_config_get() to be compliant
Date
4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Douglas Anderson <dianders@chromium.org>

[ Upstream commit 0d5b476f8f57fcb06c45fe27681ac47254f63fd2 ]

If you look at "pinconf-groups" in debugfs for ssbi-mpp you'll notice
it looks like nonsense.

The problem is fairly well described in commit 1cf86bc21257 ("pinctrl:
qcom: spmi-gpio: Fix pmic_gpio_config_get() to be compliant") and
commit 05e0c828955c ("pinctrl: msm: Fix msm_config_group_get() to be
compliant"), but it was pointed out that ssbi-mpp has the same
problem. Let's fix it there too.

NOTE: in case it's helpful to someone reading this, the way to tell
whether to do the -EINVAL or not is to look at the PCONFDUMP for a
given attribute. If the last element (has_arg) is false then you need
to do the -EINVAL trick.

ALSO NOTE: it seems unlikely that the values returned when we try to
get PIN_CONFIG_BIAS_PULL_UP will actually be printed since "has_arg"
is false for that one, but I guess it's still fine to return different
values so I kept doing that. It seems like another driver (ssbi-gpio)
uses a custom attribute (PM8XXX_QCOM_PULL_UP_STRENGTH) for something
similar so maybe a future change should do that here too.

Fixes: cfb24f6ebd38 ("pinctrl: Qualcomm SPMI PMIC MPP pin controller driver")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pinctrl/qcom/pinctrl-spmi-mpp.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)

--- a/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-mpp.c
@@ -347,13 +347,12 @@ static int pmic_mpp_config_get(struct pi

switch (param) {
case PIN_CONFIG_BIAS_DISABLE:
- arg = pad->pullup == PMIC_MPP_PULL_UP_OPEN;
+ if (pad->pullup != PMIC_MPP_PULL_UP_OPEN)
+ return -EINVAL;
+ arg = 1;
break;
case PIN_CONFIG_BIAS_PULL_UP:
switch (pad->pullup) {
- case PMIC_MPP_PULL_UP_OPEN:
- arg = 0;
- break;
case PMIC_MPP_PULL_UP_0P6KOHM:
arg = 600;
break;
@@ -368,13 +367,17 @@ static int pmic_mpp_config_get(struct pi
}
break;
case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
- arg = !pad->is_enabled;
+ if (pad->is_enabled)
+ return -EINVAL;
+ arg = 1;
break;
case PIN_CONFIG_POWER_SOURCE:
arg = pad->power_source;
break;
case PIN_CONFIG_INPUT_ENABLE:
- arg = pad->input_enabled;
+ if (!pad->input_enabled)
+ return -EINVAL;
+ arg = 1;
break;
case PIN_CONFIG_OUTPUT:
arg = pad->out_value;
@@ -386,7 +389,9 @@ static int pmic_mpp_config_get(struct pi
arg = pad->amux_input;
break;
case PMIC_MPP_CONF_PAIRED:
- arg = pad->paired;
+ if (!pad->paired)
+ return -EINVAL;
+ arg = 1;
break;
case PIN_CONFIG_DRIVE_STRENGTH:
arg = pad->drive_strength;

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