This series is based on iio/togreg [1] and includes one patch ("fix NULL
dereference on rmmod") which is already in linux-next and another patch
from Jonathan Cameron ("Take probe fully device managed") to make the
rest of the patches apply cleanly to iio/togreg.
The palmas gpadc block has support for monitoring up to 2 ADC channels
and issue an interrupt if they reach past a set threshold. This can be
configured statically with device tree today, but it only gets enabled
when reaching sleep mode. Also, it doesn't look like anyone is using it.
Instead of this one special case, change the code so userspace can
configure the ADC channels to their own needs through the iio events
subsystem. The high and low threshold values can be set for every
channel, but only 2 thresholds can be enabled at a time. Trying to
enable more than 2 thresholds will result in an error.
The configured thresholds will wake up the system from sleep mode if
wakeup is enabled in /sys/devices/.../power/wakeup.
The old platform data was removed.
Thresholds, events, and wakeup were tested on omap5-uevm board. It wakes
up from sleep mode when wakeup is enabled and a threshold is passed. A
userspace tool for monitoring events and adjusting thresholds can be
found at [2].
For more background and the use case for these patches, see [3].
V3 -> V4:
* Reabased to iio/togreg and included required patches.
* Avoid initializing variables unnecessarily.
* Minor cosmetic fixes to comments.
V2 -> V3:
* Rebased to linux-next.
* Avoid reconfiguring events on error and when old == new value.
V1 -> V2:
* Begin by removing adc_wakeupX_data instead of doing it last.
* Split changes in smaller patches
[1] git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git
[2] https://github.com/Risca/pyra_vol_mon
[3] https://pyra-handheld.com/boards/threads/improve-volume-wheel-daemon-bounty.99430/post-1711410
Jonathan Cameron (1):
iio: adc: palmas: Take probe fully device managed.
Patrik Dahlström (8):
iio: adc: palmas_gpadc: fix NULL dereference on rmmod
iio: adc: palmas: remove adc_wakeupX_data
iio: adc: palmas: replace "wakeup" with "event"
iio: adc: palmas: use iio_event_direction for threshold polarity
iio: adc: palmas: move eventX_enable into palmas_adc_event
iio: adc: palmas: always reset events on unload
iio: adc: palmas: add support for iio threshold events
iio: adc: palmas: don't alter event config on suspend/resume
drivers/iio/adc/palmas_gpadc.c | 616 +++++++++++++++++++++++++--------
include/linux/mfd/palmas.h | 8 -
2 files changed, 478 insertions(+), 146 deletions(-)
base-commit: f73df43e957a6fc705a9bd6d143585bdf1b13365
--
2.25.1
Calling dev_to_iio_dev() on a platform device pointer is undefined and
will make adc NULL.
Signed-off-by: Patrik Dahlström <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Cameron <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index fd000345ec5c..849a697a467e 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -639,7 +639,7 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
static int palmas_gpadc_remove(struct platform_device *pdev)
{
- struct iio_dev *indio_dev = dev_to_iio_dev(&pdev->dev);
+ struct iio_dev *indio_dev = dev_get_drvdata(&pdev->dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
if (adc->wakeup1_enable || adc->wakeup2_enable)
--
2.25.1
From: Jonathan Cameron <[email protected]>
Review of a recent fix highlighted that this driver could be trivially
converted to be entirely devm managed.
That fix should be applied to resolve the fix in a fashion easy to back port
even though this change removes the relevant code.
[1] https://patchwork.kernel.org/project/linux-iio/patch/[email protected]/
Signed-off-by: Jonathan Cameron <[email protected]>
Cc: Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 110 +++++++++++++--------------------
1 file changed, 42 insertions(+), 68 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 849a697a467e..2921186458e0 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -493,6 +493,11 @@ static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
return 0;
}
+static void palmas_disable_wakeup(void *dev)
+{
+ device_wakeup_disable(dev);
+}
+
static int palmas_gpadc_probe(struct platform_device *pdev)
{
struct palmas_gpadc *adc;
@@ -532,36 +537,30 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms;
adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ);
- if (adc->irq < 0) {
- dev_err(adc->dev,
- "get virq failed: %d\n", adc->irq);
- ret = adc->irq;
- goto out;
- }
- ret = request_threaded_irq(adc->irq, NULL,
- palmas_gpadc_irq,
- IRQF_ONESHOT, dev_name(adc->dev),
- adc);
- if (ret < 0) {
- dev_err(adc->dev,
- "request irq %d failed: %d\n", adc->irq, ret);
- goto out;
- }
+ if (adc->irq < 0)
+ return dev_err_probe(adc->dev, adc->irq, "get virq failed\n");
+
+ ret = devm_request_threaded_irq(&pdev->dev, adc->irq, NULL,
+ palmas_gpadc_irq,
+ IRQF_ONESHOT, dev_name(adc->dev),
+ adc);
+ if (ret < 0)
+ return dev_err_probe(adc->dev, ret,
+ "request irq %d failed\n", adc->irq);
if (gpadc_pdata->adc_wakeup1_data) {
memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data,
sizeof(adc->wakeup1_data));
adc->wakeup1_enable = true;
adc->irq_auto_0 = platform_get_irq(pdev, 1);
- ret = request_threaded_irq(adc->irq_auto_0, NULL,
- palmas_gpadc_irq_auto,
- IRQF_ONESHOT,
- "palmas-adc-auto-0", adc);
- if (ret < 0) {
- dev_err(adc->dev, "request auto0 irq %d failed: %d\n",
- adc->irq_auto_0, ret);
- goto out_irq_free;
- }
+ ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_0,
+ NULL, palmas_gpadc_irq_auto,
+ IRQF_ONESHOT,
+ "palmas-adc-auto-0", adc);
+ if (ret < 0)
+ return dev_err_probe(adc->dev, ret,
+ "request auto0 irq %d failed\n",
+ adc->irq_auto_0);
}
if (gpadc_pdata->adc_wakeup2_data) {
@@ -569,15 +568,14 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
sizeof(adc->wakeup2_data));
adc->wakeup2_enable = true;
adc->irq_auto_1 = platform_get_irq(pdev, 2);
- ret = request_threaded_irq(adc->irq_auto_1, NULL,
- palmas_gpadc_irq_auto,
- IRQF_ONESHOT,
- "palmas-adc-auto-1", adc);
- if (ret < 0) {
- dev_err(adc->dev, "request auto1 irq %d failed: %d\n",
- adc->irq_auto_1, ret);
- goto out_irq_auto0_free;
- }
+ ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_1,
+ NULL, palmas_gpadc_irq_auto,
+ IRQF_ONESHOT,
+ "palmas-adc-auto-1", adc);
+ if (ret < 0)
+ return dev_err_probe(adc->dev, ret,
+ "request auto1 irq %d failed\n",
+ adc->irq_auto_1);
}
/* set the current source 0 (value 0/5/15/20 uA => 0..3) */
@@ -608,11 +606,10 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
indio_dev->channels = palmas_gpadc_iio_channel;
indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel);
- ret = iio_device_register(indio_dev);
- if (ret < 0) {
- dev_err(adc->dev, "iio_device_register() failed: %d\n", ret);
- goto out_irq_auto1_free;
- }
+ ret = devm_iio_device_register(&pdev->dev, indio_dev);
+ if (ret < 0)
+ return dev_err_probe(adc->dev, ret,
+ "iio_device_register() failed\n");
device_set_wakeup_capable(&pdev->dev, 1);
for (i = 0; i < PALMAS_ADC_CH_MAX; i++) {
@@ -620,36 +617,14 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
palmas_gpadc_calibrate(adc, i);
}
- if (adc->wakeup1_enable || adc->wakeup2_enable)
+ if (adc->wakeup1_enable || adc->wakeup2_enable) {
device_wakeup_enable(&pdev->dev);
-
- return 0;
-
-out_irq_auto1_free:
- if (gpadc_pdata->adc_wakeup2_data)
- free_irq(adc->irq_auto_1, adc);
-out_irq_auto0_free:
- if (gpadc_pdata->adc_wakeup1_data)
- free_irq(adc->irq_auto_0, adc);
-out_irq_free:
- free_irq(adc->irq, adc);
-out:
- return ret;
-}
-
-static int palmas_gpadc_remove(struct platform_device *pdev)
-{
- struct iio_dev *indio_dev = dev_get_drvdata(&pdev->dev);
- struct palmas_gpadc *adc = iio_priv(indio_dev);
-
- if (adc->wakeup1_enable || adc->wakeup2_enable)
- device_wakeup_disable(&pdev->dev);
- iio_device_unregister(indio_dev);
- free_irq(adc->irq, adc);
- if (adc->wakeup1_enable)
- free_irq(adc->irq_auto_0, adc);
- if (adc->wakeup2_enable)
- free_irq(adc->irq_auto_1, adc);
+ ret = devm_add_action_or_reset(&pdev->dev,
+ palmas_disable_wakeup,
+ &pdev->dev);
+ if (ret)
+ return ret;
+ }
return 0;
}
@@ -834,7 +809,6 @@ MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl);
static struct platform_driver palmas_gpadc_driver = {
.probe = palmas_gpadc_probe,
- .remove = palmas_gpadc_remove,
.driver = {
.name = MOD_NAME,
.pm = pm_sleep_ptr(&palmas_pm_ops),
--
2.25.1
It does not seem to be used by anyone and later patches in this series
are made simpler by first removing this. There is now a lot of dead code
that cannot be reached, until later patches revive it. Arguably, this is
preferred over removing the code only to add it again.
Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 50 ++++------------------------------
include/linux/mfd/palmas.h | 8 ------
2 files changed, 6 insertions(+), 52 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 2921186458e0..03af6cd73ec8 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -76,6 +76,12 @@ static struct palmas_gpadc_info palmas_gpadc_info[] = {
PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
};
+struct palmas_adc_wakeup_property {
+ int adc_channel_number;
+ int adc_high_threshold;
+ int adc_low_threshold;
+};
+
/*
* struct palmas_gpadc - the palmas_gpadc structure
* @ch0_current: channel 0 current source setting
@@ -493,11 +499,6 @@ static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
return 0;
}
-static void palmas_disable_wakeup(void *dev)
-{
- device_wakeup_disable(dev);
-}
-
static int palmas_gpadc_probe(struct platform_device *pdev)
{
struct palmas_gpadc *adc;
@@ -548,36 +549,6 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
return dev_err_probe(adc->dev, ret,
"request irq %d failed\n", adc->irq);
- if (gpadc_pdata->adc_wakeup1_data) {
- memcpy(&adc->wakeup1_data, gpadc_pdata->adc_wakeup1_data,
- sizeof(adc->wakeup1_data));
- adc->wakeup1_enable = true;
- adc->irq_auto_0 = platform_get_irq(pdev, 1);
- ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_0,
- NULL, palmas_gpadc_irq_auto,
- IRQF_ONESHOT,
- "palmas-adc-auto-0", adc);
- if (ret < 0)
- return dev_err_probe(adc->dev, ret,
- "request auto0 irq %d failed\n",
- adc->irq_auto_0);
- }
-
- if (gpadc_pdata->adc_wakeup2_data) {
- memcpy(&adc->wakeup2_data, gpadc_pdata->adc_wakeup2_data,
- sizeof(adc->wakeup2_data));
- adc->wakeup2_enable = true;
- adc->irq_auto_1 = platform_get_irq(pdev, 2);
- ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_1,
- NULL, palmas_gpadc_irq_auto,
- IRQF_ONESHOT,
- "palmas-adc-auto-1", adc);
- if (ret < 0)
- return dev_err_probe(adc->dev, ret,
- "request auto1 irq %d failed\n",
- adc->irq_auto_1);
- }
-
/* set the current source 0 (value 0/5/15/20 uA => 0..3) */
if (gpadc_pdata->ch0_current <= 1)
adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
@@ -617,15 +588,6 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
palmas_gpadc_calibrate(adc, i);
}
- if (adc->wakeup1_enable || adc->wakeup2_enable) {
- device_wakeup_enable(&pdev->dev);
- ret = devm_add_action_or_reset(&pdev->dev,
- palmas_disable_wakeup,
- &pdev->dev);
- if (ret)
- return ret;
- }
-
return 0;
}
diff --git a/include/linux/mfd/palmas.h b/include/linux/mfd/palmas.h
index 117d02708439..eda1ffd99c1a 100644
--- a/include/linux/mfd/palmas.h
+++ b/include/linux/mfd/palmas.h
@@ -128,12 +128,6 @@ struct palmas_pmic_driver_data {
struct regulator_config config);
};
-struct palmas_adc_wakeup_property {
- int adc_channel_number;
- int adc_high_threshold;
- int adc_low_threshold;
-};
-
struct palmas_gpadc_platform_data {
/* Channel 3 current source is only enabled during conversion */
int ch3_current; /* 0: off; 1: 10uA; 2: 400uA; 3: 800 uA */
@@ -152,8 +146,6 @@ struct palmas_gpadc_platform_data {
int start_polarity;
int auto_conversion_period_ms;
- struct palmas_adc_wakeup_property *adc_wakeup1_data;
- struct palmas_adc_wakeup_property *adc_wakeup2_data;
};
struct palmas_reg_init {
--
2.25.1
The palmas gpadc block has support for monitoring up to 2 ADC channels
and issue an interrupt if they reach past a set threshold. This is
currently used to wake up the system from sleep, but the functionality
is more generic than that. As such, change the naming of functions and
variables to refer to it as events instead, except during suspend and
resume where wakeup still make sense.
Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 50 +++++++++++++++++-----------------
1 file changed, 25 insertions(+), 25 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 03af6cd73ec8..55fdf59ef711 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -76,7 +76,7 @@ static struct palmas_gpadc_info palmas_gpadc_info[] = {
PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
};
-struct palmas_adc_wakeup_property {
+struct palmas_adc_event {
int adc_channel_number;
int adc_high_threshold;
int adc_low_threshold;
@@ -117,10 +117,10 @@ struct palmas_gpadc {
int irq_auto_1;
struct palmas_gpadc_info *adc_info;
struct completion conv_completion;
- struct palmas_adc_wakeup_property wakeup1_data;
- struct palmas_adc_wakeup_property wakeup2_data;
- bool wakeup1_enable;
- bool wakeup2_enable;
+ struct palmas_adc_event event0;
+ struct palmas_adc_event event1;
+ bool event0_enable;
+ bool event1_enable;
int auto_conversion_period;
struct mutex lock;
};
@@ -591,7 +591,7 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
return 0;
}
-static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
+static int palmas_adc_configure_events(struct palmas_gpadc *adc)
{
int adc_period, conv;
int i;
@@ -617,16 +617,16 @@ static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
}
conv = 0;
- if (adc->wakeup1_enable) {
+ if (adc->event0_enable) {
int polarity;
- ch0 = adc->wakeup1_data.adc_channel_number;
+ ch0 = adc->event0.adc_channel_number;
conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
- if (adc->wakeup1_data.adc_high_threshold > 0) {
- thres = adc->wakeup1_data.adc_high_threshold;
+ if (adc->event0.adc_high_threshold > 0) {
+ thres = adc->event0.adc_high_threshold;
polarity = 0;
} else {
- thres = adc->wakeup1_data.adc_low_threshold;
+ thres = adc->event0.adc_low_threshold;
polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
}
@@ -648,16 +648,16 @@ static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
}
}
- if (adc->wakeup2_enable) {
+ if (adc->event1_enable) {
int polarity;
- ch1 = adc->wakeup2_data.adc_channel_number;
+ ch1 = adc->event1.adc_channel_number;
conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
- if (adc->wakeup2_data.adc_high_threshold > 0) {
- thres = adc->wakeup2_data.adc_high_threshold;
+ if (adc->event1.adc_high_threshold > 0) {
+ thres = adc->event1.adc_high_threshold;
polarity = 0;
} else {
- thres = adc->wakeup2_data.adc_low_threshold;
+ thres = adc->event1.adc_low_threshold;
polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
}
@@ -696,7 +696,7 @@ static int palmas_adc_wakeup_configure(struct palmas_gpadc *adc)
return ret;
}
-static int palmas_adc_wakeup_reset(struct palmas_gpadc *adc)
+static int palmas_adc_reset_events(struct palmas_gpadc *adc)
{
int ret;
@@ -718,20 +718,20 @@ static int palmas_gpadc_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
- int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
+ int wakeup = adc->event0_enable || adc->event1_enable;
int ret;
if (!device_may_wakeup(dev) || !wakeup)
return 0;
- ret = palmas_adc_wakeup_configure(adc);
+ ret = palmas_adc_configure_events(adc);
if (ret < 0)
return ret;
- if (adc->wakeup1_enable)
+ if (adc->event0_enable)
enable_irq_wake(adc->irq_auto_0);
- if (adc->wakeup2_enable)
+ if (adc->event1_enable)
enable_irq_wake(adc->irq_auto_1);
return 0;
@@ -741,20 +741,20 @@ static int palmas_gpadc_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
- int wakeup = adc->wakeup1_enable || adc->wakeup2_enable;
+ int wakeup = adc->event0_enable || adc->event1_enable;
int ret;
if (!device_may_wakeup(dev) || !wakeup)
return 0;
- ret = palmas_adc_wakeup_reset(adc);
+ ret = palmas_adc_reset_events(adc);
if (ret < 0)
return ret;
- if (adc->wakeup1_enable)
+ if (adc->event0_enable)
disable_irq_wake(adc->irq_auto_0);
- if (adc->wakeup2_enable)
+ if (adc->event1_enable)
disable_irq_wake(adc->irq_auto_1);
return 0;
--
2.25.1
Instead of having high_threshold > 0 as an indicator for upper threshold
event and lower threshold event otherwise, use enum iio_event_direction
instead. This is hopefully less ambiguous.
Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 36 ++++++++++++++++++++++------------
1 file changed, 23 insertions(+), 13 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 55fdf59ef711..205a7628b235 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -77,9 +77,9 @@ static struct palmas_gpadc_info palmas_gpadc_info[] = {
};
struct palmas_adc_event {
- int adc_channel_number;
- int adc_high_threshold;
- int adc_low_threshold;
+ int channel;
+ int raw_thresh;
+ enum iio_event_direction direction;
};
/*
@@ -618,16 +618,21 @@ static int palmas_adc_configure_events(struct palmas_gpadc *adc)
conv = 0;
if (adc->event0_enable) {
+ struct palmas_adc_event *ev = &adc->event0;
int polarity;
- ch0 = adc->event0.adc_channel_number;
+ ch0 = ev->channel;
+ thres = ev->raw_thresh;
conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
- if (adc->event0.adc_high_threshold > 0) {
- thres = adc->event0.adc_high_threshold;
+ switch (ev->direction) {
+ case IIO_EV_DIR_RISING:
polarity = 0;
- } else {
- thres = adc->event0.adc_low_threshold;
+ break;
+ case IIO_EV_DIR_FALLING:
polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
+ break;
+ default:
+ return -EINVAL;
}
ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
@@ -649,16 +654,21 @@ static int palmas_adc_configure_events(struct palmas_gpadc *adc)
}
if (adc->event1_enable) {
+ struct palmas_adc_event *ev = &adc->event1;
int polarity;
- ch1 = adc->event1.adc_channel_number;
+ ch1 = ev->channel;
+ thres = ev->raw_thresh;
conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
- if (adc->event1.adc_high_threshold > 0) {
- thres = adc->event1.adc_high_threshold;
+ switch (ev->direction) {
+ case IIO_EV_DIR_RISING:
polarity = 0;
- } else {
- thres = adc->event1.adc_low_threshold;
+ break;
+ case IIO_EV_DIR_FALLING:
polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
+ break;
+ default:
+ return -EINVAL;
}
ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
--
2.25.1
It just makes more sense to have all information regarding adc events in
one place.
Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 19 +++++++++----------
1 file changed, 9 insertions(+), 10 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 205a7628b235..8c6ea4a3cd2e 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -77,6 +77,7 @@ static struct palmas_gpadc_info palmas_gpadc_info[] = {
};
struct palmas_adc_event {
+ bool enabled;
int channel;
int raw_thresh;
enum iio_event_direction direction;
@@ -119,8 +120,6 @@ struct palmas_gpadc {
struct completion conv_completion;
struct palmas_adc_event event0;
struct palmas_adc_event event1;
- bool event0_enable;
- bool event1_enable;
int auto_conversion_period;
struct mutex lock;
};
@@ -617,7 +616,7 @@ static int palmas_adc_configure_events(struct palmas_gpadc *adc)
}
conv = 0;
- if (adc->event0_enable) {
+ if (adc->event0.enabled) {
struct palmas_adc_event *ev = &adc->event0;
int polarity;
@@ -653,7 +652,7 @@ static int palmas_adc_configure_events(struct palmas_gpadc *adc)
}
}
- if (adc->event1_enable) {
+ if (adc->event1.enabled) {
struct palmas_adc_event *ev = &adc->event1;
int polarity;
@@ -728,7 +727,7 @@ static int palmas_gpadc_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
- int wakeup = adc->event0_enable || adc->event1_enable;
+ int wakeup = adc->event0.enabled || adc->event1.enabled;
int ret;
if (!device_may_wakeup(dev) || !wakeup)
@@ -738,10 +737,10 @@ static int palmas_gpadc_suspend(struct device *dev)
if (ret < 0)
return ret;
- if (adc->event0_enable)
+ if (adc->event0.enabled)
enable_irq_wake(adc->irq_auto_0);
- if (adc->event1_enable)
+ if (adc->event1.enabled)
enable_irq_wake(adc->irq_auto_1);
return 0;
@@ -751,7 +750,7 @@ static int palmas_gpadc_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
- int wakeup = adc->event0_enable || adc->event1_enable;
+ int wakeup = adc->event0.enabled || adc->event1.enabled;
int ret;
if (!device_may_wakeup(dev) || !wakeup)
@@ -761,10 +760,10 @@ static int palmas_gpadc_resume(struct device *dev)
if (ret < 0)
return ret;
- if (adc->event0_enable)
+ if (adc->event0.enabled)
disable_irq_wake(adc->irq_auto_0);
- if (adc->event1_enable)
+ if (adc->event1.enabled)
disable_irq_wake(adc->irq_auto_1);
return 0;
--
2.25.1
This prevents leaving the adc in freerunning mode when removing the
driver.
Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index 8c6ea4a3cd2e..da4908608a27 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -498,6 +498,13 @@ static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
return 0;
}
+static void palmas_gpadc_reset(void *data)
+{
+ struct palmas_gpadc *adc = data;
+ if (adc->event0.enabled || adc->event1.enabled)
+ palmas_adc_reset_events(adc);
+}
+
static int palmas_gpadc_probe(struct platform_device *pdev)
{
struct palmas_gpadc *adc;
@@ -587,6 +594,10 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
palmas_gpadc_calibrate(adc, i);
}
+ ret = devm_add_action(&pdev->dev, palmas_gpadc_reset, adc);
+ if (ret)
+ return ret;
+
return 0;
}
--
2.25.1
The palmas gpadc block has support for monitoring up to 2 ADC channels
and issue an interrupt if they reach past a set threshold. This change
hooks into the IIO events system and exposes to userspace the ability to
configure these threshold values for each channel, but only allow up to
2 such thresholds to be enabled at any given time. Trying to enable a
third channel will result in an error.
Userspace is expected to input calibrated, as opposed to raw, values as
threshold. However, it is not enough to do the opposite of what is done
when converting the other way around. To account for tolerances in the
ADC, the calculated raw threshold should be adjusted based on the ADC
specifications for the device. These specifications include the integral
nonlinearity (INL), offset, and gain error. To adjust the high
threshold, use the following equation:
(calibrated value + INL) * Gain error + offset = maximum value [1]
Likewise, use the following equation for the low threshold:
(calibrated value - INL) * Gain error - offset = minimum value
The gain error is a combination of gain error, as listed in the
datasheet, and gain error drift due to temperature and supply. The exact
values for these specifications vary between palmas devices. This patch
sets the values found in TWL6035, TWL6037 datasheet.
[1] TI Application Report, SLIA087A, Guide to Using the GPADC in
TPS65903x, TPS65917-Q1, TPS65919-Q1, and TPS65916 Devices.
Signed-off-by: Patrik Dahlström <[email protected]>
---
V3 -> V4:
* Avoid initializing variables unnecessarily.
* Minor cosmetic fixes to comments.
drivers/iio/adc/palmas_gpadc.c | 444 +++++++++++++++++++++++++++++++--
1 file changed, 420 insertions(+), 24 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index da4908608a27..f16f4ef184e4 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -20,6 +20,7 @@
#include <linux/completion.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/iio/machine.h>
#include <linux/iio/driver.h>
@@ -79,10 +80,14 @@ static struct palmas_gpadc_info palmas_gpadc_info[] = {
struct palmas_adc_event {
bool enabled;
int channel;
- int raw_thresh;
enum iio_event_direction direction;
};
+struct palmas_gpadc_thresholds {
+ int high;
+ int low;
+};
+
/*
* struct palmas_gpadc - the palmas_gpadc structure
* @ch0_current: channel 0 current source setting
@@ -120,10 +125,31 @@ struct palmas_gpadc {
struct completion conv_completion;
struct palmas_adc_event event0;
struct palmas_adc_event event1;
+ struct palmas_gpadc_thresholds thresholds[PALMAS_ADC_CH_MAX];
int auto_conversion_period;
struct mutex lock;
};
+static struct palmas_adc_event *palmas_gpadc_get_event(struct palmas_gpadc *adc,
+ int adc_chan,
+ enum iio_event_direction dir)
+{
+ if (adc_chan == adc->event0.channel && dir == adc->event0.direction)
+ return &adc->event0;
+
+ if (adc_chan == adc->event1.channel && dir == adc->event1.direction)
+ return &adc->event1;
+
+ return NULL;
+}
+
+static bool palmas_gpadc_channel_is_freerunning(struct palmas_gpadc *adc,
+ int adc_chan)
+{
+ return palmas_gpadc_get_event(adc, adc_chan, IIO_EV_DIR_RISING) ||
+ palmas_gpadc_get_event(adc, adc_chan, IIO_EV_DIR_FALLING);
+}
+
/*
* GPADC lock issue in AUTO mode.
* Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO
@@ -193,11 +219,24 @@ static irqreturn_t palmas_gpadc_irq(int irq, void *data)
static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data)
{
- struct palmas_gpadc *adc = data;
+ struct iio_dev *indio_dev = data;
+ struct palmas_gpadc *adc = iio_priv(indio_dev);
+ struct palmas_adc_event *ev;
dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq);
palmas_disable_auto_conversion(adc);
+ ev = (irq == adc->irq_auto_0) ? &adc->event0 : &adc->event1;
+ if (ev->channel != -1) {
+ enum iio_event_direction dir;
+ u64 code;
+
+ dir = ev->direction;
+ code = IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, ev->channel,
+ IIO_EV_TYPE_THRESH, dir);
+ iio_push_event(indio_dev, code, iio_get_time_ns(indio_dev));
+ }
+
return IRQ_HANDLED;
}
@@ -285,6 +324,9 @@ static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan)
{
int ret;
+ if (palmas_gpadc_channel_is_freerunning(adc, adc_chan))
+ return 0; /* ADC already running */
+
ret = palmas_gpadc_enable(adc, adc_chan, true);
if (ret < 0)
return ret;
@@ -344,28 +386,43 @@ static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan)
unsigned int val;
int ret;
- init_completion(&adc->conv_completion);
- ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
- PALMAS_GPADC_SW_SELECT,
- PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
- PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
- if (ret < 0) {
- dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
- return ret;
- }
+ if (palmas_gpadc_channel_is_freerunning(adc, adc_chan)) {
+ int event = (adc_chan == adc->event0.channel) ? 0 : 1;
+ unsigned int reg = (event == 0) ?
+ PALMAS_GPADC_AUTO_CONV0_LSB :
+ PALMAS_GPADC_AUTO_CONV1_LSB;
- ret = wait_for_completion_timeout(&adc->conv_completion,
- PALMAS_ADC_CONVERSION_TIMEOUT);
- if (ret == 0) {
- dev_err(adc->dev, "conversion not completed\n");
- return -ETIMEDOUT;
- }
+ ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
+ reg, &val, 2);
+ if (ret < 0) {
+ dev_err(adc->dev, "AUTO_CONV%x_LSB read failed: %d\n",
+ event, ret);
+ return ret;
+ }
+ } else {
+ init_completion(&adc->conv_completion);
+ ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
+ PALMAS_GPADC_SW_SELECT,
+ PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
+ PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
+ if (ret < 0) {
+ dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
+ return ret;
+ }
- ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
- PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
- if (ret < 0) {
- dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
- return ret;
+ ret = wait_for_completion_timeout(&adc->conv_completion,
+ PALMAS_ADC_CONVERSION_TIMEOUT);
+ if (ret == 0) {
+ dev_err(adc->dev, "conversion not completed\n");
+ return -ETIMEDOUT;
+ }
+
+ ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
+ PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
+ if (ret < 0) {
+ dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
+ return ret;
+ }
}
ret = val & 0xFFF;
@@ -391,6 +448,98 @@ static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
return val;
}
+/*
+ * The high and low threshold values are calculated based on the advice given
+ * in TI Application Report SLIA087A, "Guide to Using the GPADC in PS65903x,
+ * TPS65917-Q1, TPS65919-Q1, and TPS65916 Devices". This document recommend
+ * taking ADC tolerances into account and is based on the device integral non-
+ * linearity (INL), offset error and gain error:
+ *
+ * raw high threshold = (ideal threshold + INL) * gain error + offset error
+ *
+ * The gain error include both gain error, as specified in the datasheet, and
+ * the gain error drift. These paramenters vary depending on device and whether
+ * the the channel is calibrated (trimmed) or not.
+ */
+static int palmas_gpadc_threshold_with_tolerance(int val, const int INL,
+ const int gain_error,
+ const int offset_error)
+{
+ val = ((val + INL) * (1000 + gain_error)) / 1000 + offset_error;
+
+ return clamp(val, 0, 0xFFF);
+}
+
+/*
+ * The values below are taken from the datasheet of TWL6035, TWL6037.
+ * todo: get max INL, gain error, and offset error from OF.
+ */
+static int palmas_gpadc_get_high_threshold_raw(struct palmas_gpadc *adc,
+ struct palmas_adc_event *ev)
+{
+ const int adc_chan = ev->channel;
+ int val = adc->thresholds[adc_chan].high;
+ /* integral nonlinearity, measured in LSB */
+ const int max_INL = 2;
+ /* measured in LSB */
+ int max_offset_error;
+ /* 0.2% when calibrated */
+ int max_gain_error = 2;
+
+ val = (val * 1000) / adc->adc_info[adc_chan].gain;
+
+ if (adc->adc_info[adc_chan].is_uncalibrated) {
+ /* 2% worse */
+ max_gain_error += 20;
+ max_offset_error = 36;
+ } else {
+ val = (val * adc->adc_info[adc_chan].gain_error +
+ adc->adc_info[adc_chan].offset) /
+ 1000;
+ max_offset_error = 2;
+ }
+
+ return palmas_gpadc_threshold_with_tolerance(val,
+ max_INL,
+ max_gain_error,
+ max_offset_error);
+}
+
+/*
+ * The values below are taken from the datasheet of TWL6035, TWL6037.
+ * todo: get min INL, gain error, and offset error from OF.
+ */
+static int palmas_gpadc_get_low_threshold_raw(struct palmas_gpadc *adc,
+ struct palmas_adc_event *ev)
+{
+ const int adc_chan = ev->channel;
+ int val = adc->thresholds[adc_chan].low;
+ /* integral nonlinearity, measured in LSB */
+ const int min_INL = -2;
+ /* measured in LSB */
+ int min_offset_error;
+ /* -0.6% when calibrated */
+ int min_gain_error = -6;
+
+ val = (val * 1000) / adc->adc_info[adc_chan].gain;
+
+ if (adc->adc_info[adc_chan].is_uncalibrated) {
+ /* 2% worse */
+ min_gain_error -= 20;
+ min_offset_error = -36;
+ } else {
+ val = (val * adc->adc_info[adc_chan].gain_error -
+ adc->adc_info[adc_chan].offset) /
+ 1000;
+ min_offset_error = -2;
+ }
+
+ return palmas_gpadc_threshold_with_tolerance(val,
+ min_INL,
+ min_gain_error,
+ min_offset_error);
+}
+
static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val, int *val2, long mask)
{
@@ -437,8 +586,218 @@ static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
return ret;
}
+static int palmas_gpadc_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct palmas_gpadc *adc = iio_priv(indio_dev);
+ int adc_chan = chan->channel;
+ int ret = 0;
+
+ if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ return -EINVAL;
+
+ mutex_lock(&adc->lock);
+
+ if (palmas_gpadc_get_event(adc, adc_chan, dir))
+ ret = 1;
+
+ mutex_unlock(&adc->lock);
+
+ return ret;
+}
+
+static int palmas_adc_configure_events(struct palmas_gpadc *adc);
+static int palmas_adc_reset_events(struct palmas_gpadc *adc);
+
+static int palmas_gpadc_reconfigure_event_channels(struct palmas_gpadc *adc)
+{
+ return (adc->event0.enabled || adc->event1.enabled) ?
+ palmas_adc_configure_events(adc) :
+ palmas_adc_reset_events(adc);
+}
+
+static int palmas_gpadc_enable_event_config(struct palmas_gpadc *adc,
+ const struct iio_chan_spec *chan,
+ enum iio_event_direction dir)
+{
+ struct palmas_adc_event *ev;
+ int adc_chan = chan->channel;
+
+ if (palmas_gpadc_get_event(adc, adc_chan, dir))
+ /* already enabled */
+ return 0;
+
+ if (adc->event0.channel == -1) {
+ ev = &adc->event0;
+ } else if (adc->event1.channel == -1) {
+ /* event0 has to be the lowest channel */
+ if (adc_chan < adc->event0.channel) {
+ adc->event1 = adc->event0;
+ ev = &adc->event0;
+ } else {
+ ev = &adc->event1;
+ }
+ } else { /* both AUTO channels already in use */
+ dev_warn(adc->dev, "event0 - %d, event1 - %d\n",
+ adc->event0.channel, adc->event1.channel);
+ return -EBUSY;
+ }
+
+ ev->enabled = true;
+ ev->channel = adc_chan;
+ ev->direction = dir;
+
+ return palmas_gpadc_reconfigure_event_channels(adc);
+}
+
+static int palmas_gpadc_disable_event_config(struct palmas_gpadc *adc,
+ const struct iio_chan_spec *chan,
+ enum iio_event_direction dir)
+{
+ int adc_chan = chan->channel;
+ struct palmas_adc_event *ev = palmas_gpadc_get_event(adc, adc_chan, dir);
+
+ if (!ev)
+ return 0;
+
+ if (ev == &adc->event0) {
+ adc->event0 = adc->event1;
+ ev = &adc->event1;
+ }
+
+ ev->enabled = false;
+ ev->channel = -1;
+ ev->direction = IIO_EV_DIR_NONE;
+
+ return palmas_gpadc_reconfigure_event_channels(adc);
+}
+
+static int palmas_gpadc_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ int state)
+{
+ struct palmas_gpadc *adc = iio_priv(indio_dev);
+ int adc_chan = chan->channel;
+ int ret;
+
+ if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ return -EINVAL;
+
+ mutex_lock(&adc->lock);
+
+ if (state)
+ ret = palmas_gpadc_enable_event_config(adc, chan, dir);
+ else
+ ret = palmas_gpadc_disable_event_config(adc, chan, dir);
+
+ mutex_unlock(&adc->lock);
+
+ return ret;
+}
+
+static int palmas_gpadc_read_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int *val, int *val2)
+{
+ struct palmas_gpadc *adc = iio_priv(indio_dev);
+ int adc_chan = chan->channel;
+ int ret;
+
+ if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ return -EINVAL;
+
+ mutex_lock(&adc->lock);
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ *val = (dir == IIO_EV_DIR_RISING) ?
+ adc->thresholds[adc_chan].high :
+ adc->thresholds[adc_chan].low;
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ mutex_unlock(&adc->lock);
+
+ return ret;
+}
+
+static int palmas_gpadc_write_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info,
+ int val, int val2)
+{
+ struct palmas_gpadc *adc = iio_priv(indio_dev);
+ int adc_chan = chan->channel;
+ int old;
+ int ret;
+
+ if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
+ return -EINVAL;
+
+ mutex_lock(&adc->lock);
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ if (val < 0 || val > 0xFFF) {
+ ret = -EINVAL;
+ break;
+ }
+ if (dir == IIO_EV_DIR_RISING) {
+ old = adc->thresholds[adc_chan].high;
+ adc->thresholds[adc_chan].high = val;
+ }
+ else {
+ old = adc->thresholds[adc_chan].low;
+ adc->thresholds[adc_chan].low = val;
+ }
+ ret = 0;
+ break;
+ default:
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (val != old && palmas_gpadc_get_event(adc, adc_chan, dir))
+ ret = palmas_gpadc_reconfigure_event_channels(adc);
+
+out_unlock:
+ mutex_unlock(&adc->lock);
+
+ return ret;
+}
+
static const struct iio_info palmas_gpadc_iio_info = {
.read_raw = palmas_gpadc_read_raw,
+ .read_event_config = palmas_gpadc_read_event_config,
+ .write_event_config = palmas_gpadc_write_event_config,
+ .read_event_value = palmas_gpadc_read_event_value,
+ .write_event_value = palmas_gpadc_write_event_value,
+};
+
+static const struct iio_event_spec palmas_gpadc_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ }, {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
};
#define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info) \
@@ -449,6 +808,8 @@ static const struct iio_info palmas_gpadc_iio_info = {
BIT(chan_info), \
.indexed = 1, \
.channel = PALMAS_ADC_CH_##chan, \
+ .event_spec = palmas_gpadc_events, \
+ .num_event_specs = ARRAY_SIZE(palmas_gpadc_events) \
}
static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
@@ -555,6 +916,39 @@ static int palmas_gpadc_probe(struct platform_device *pdev)
return dev_err_probe(adc->dev, ret,
"request irq %d failed\n", adc->irq);
+ adc->irq_auto_0 = platform_get_irq(pdev, 1);
+ if (adc->irq_auto_0 < 0)
+ return dev_err_probe(adc->dev, adc->irq_auto_0,
+ "get auto0 irq failed\n");
+
+ ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_0, NULL,
+ palmas_gpadc_irq_auto, IRQF_ONESHOT,
+ "palmas-adc-auto-0", indio_dev);
+ if (ret < 0)
+ return dev_err_probe(adc->dev, ret,
+ "request auto0 irq %d failed\n",
+ adc->irq_auto_0);
+
+ adc->irq_auto_1 = platform_get_irq(pdev, 2);
+ if (adc->irq_auto_1 < 0)
+ return dev_err_probe(adc->dev, adc->irq_auto_1,
+ "get auto1 irq failed\n");
+
+ ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_1, NULL,
+ palmas_gpadc_irq_auto, IRQF_ONESHOT,
+ "palmas-adc-auto-1", indio_dev);
+ if (ret < 0)
+ return dev_err_probe(adc->dev, ret,
+ "request auto1 irq %d failed\n",
+ adc->irq_auto_1);
+
+ adc->event0.enabled = false;
+ adc->event0.channel = -1;
+ adc->event0.direction = IIO_EV_DIR_NONE;
+ adc->event1.enabled = false;
+ adc->event1.channel = -1;
+ adc->event1.direction = IIO_EV_DIR_NONE;
+
/* set the current source 0 (value 0/5/15/20 uA => 0..3) */
if (gpadc_pdata->ch0_current <= 1)
adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
@@ -632,13 +1026,14 @@ static int palmas_adc_configure_events(struct palmas_gpadc *adc)
int polarity;
ch0 = ev->channel;
- thres = ev->raw_thresh;
conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
switch (ev->direction) {
case IIO_EV_DIR_RISING:
+ thres = palmas_gpadc_get_high_threshold_raw(adc, ev);
polarity = 0;
break;
case IIO_EV_DIR_FALLING:
+ thres = palmas_gpadc_get_low_threshold_raw(adc, ev);
polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
break;
default:
@@ -668,13 +1063,14 @@ static int palmas_adc_configure_events(struct palmas_gpadc *adc)
int polarity;
ch1 = ev->channel;
- thres = ev->raw_thresh;
conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
switch (ev->direction) {
case IIO_EV_DIR_RISING:
+ thres = palmas_gpadc_get_high_threshold_raw(adc, ev);
polarity = 0;
break;
case IIO_EV_DIR_FALLING:
+ thres = palmas_gpadc_get_low_threshold_raw(adc, ev);
polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
break;
default:
--
2.25.1
The event config is controlled through the IIO events subsystem and
device wakeup is controlled by /sys/devices/.../power/wakeup. Let's keep
those two knobs independent.
Signed-off-by: Patrik Dahlström <[email protected]>
---
drivers/iio/adc/palmas_gpadc.c | 16 ++--------------
1 file changed, 2 insertions(+), 14 deletions(-)
diff --git a/drivers/iio/adc/palmas_gpadc.c b/drivers/iio/adc/palmas_gpadc.c
index f16f4ef184e4..f2ea3f2de363 100644
--- a/drivers/iio/adc/palmas_gpadc.c
+++ b/drivers/iio/adc/palmas_gpadc.c
@@ -1134,16 +1134,10 @@ static int palmas_gpadc_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
- int wakeup = adc->event0.enabled || adc->event1.enabled;
- int ret;
- if (!device_may_wakeup(dev) || !wakeup)
+ if (!device_may_wakeup(dev))
return 0;
- ret = palmas_adc_configure_events(adc);
- if (ret < 0)
- return ret;
-
if (adc->event0.enabled)
enable_irq_wake(adc->irq_auto_0);
@@ -1157,16 +1151,10 @@ static int palmas_gpadc_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct palmas_gpadc *adc = iio_priv(indio_dev);
- int wakeup = adc->event0.enabled || adc->event1.enabled;
- int ret;
- if (!device_may_wakeup(dev) || !wakeup)
+ if (!device_may_wakeup(dev))
return 0;
- ret = palmas_adc_reset_events(adc);
- if (ret < 0)
- return ret;
-
if (adc->event0.enabled)
disable_irq_wake(adc->irq_auto_0);
--
2.25.1
On Sat, 8 Apr 2023 13:48:16 +0200
Patrik Dahlström <[email protected]> wrote:
Hi Patrik,
Patches 3-9 applied from this posting to the togreg branch of iio.git
which will initially be pushed out as testing so 0-day can poke at it
tomorrow.
Thanks,
Jonathan
> This series is based on iio/togreg [1] and includes one patch ("fix NULL
> dereference on rmmod") which is already in linux-next and another patch
> from Jonathan Cameron ("Take probe fully device managed") to make the
> rest of the patches apply cleanly to iio/togreg.
>
> The palmas gpadc block has support for monitoring up to 2 ADC channels
> and issue an interrupt if they reach past a set threshold. This can be
> configured statically with device tree today, but it only gets enabled
> when reaching sleep mode. Also, it doesn't look like anyone is using it.
>
> Instead of this one special case, change the code so userspace can
> configure the ADC channels to their own needs through the iio events
> subsystem. The high and low threshold values can be set for every
> channel, but only 2 thresholds can be enabled at a time. Trying to
> enable more than 2 thresholds will result in an error.
>
> The configured thresholds will wake up the system from sleep mode if
> wakeup is enabled in /sys/devices/.../power/wakeup.
>
> The old platform data was removed.
>
> Thresholds, events, and wakeup were tested on omap5-uevm board. It wakes
> up from sleep mode when wakeup is enabled and a threshold is passed. A
> userspace tool for monitoring events and adjusting thresholds can be
> found at [2].
>
> For more background and the use case for these patches, see [3].
>
> V3 -> V4:
> * Reabased to iio/togreg and included required patches.
> * Avoid initializing variables unnecessarily.
> * Minor cosmetic fixes to comments.
> V2 -> V3:
> * Rebased to linux-next.
> * Avoid reconfiguring events on error and when old == new value.
> V1 -> V2:
> * Begin by removing adc_wakeupX_data instead of doing it last.
> * Split changes in smaller patches
>
> [1] git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio.git
> [2] https://github.com/Risca/pyra_vol_mon
> [3] https://pyra-handheld.com/boards/threads/improve-volume-wheel-daemon-bounty.99430/post-1711410
>
> Jonathan Cameron (1):
> iio: adc: palmas: Take probe fully device managed.
>
> Patrik Dahlström (8):
> iio: adc: palmas_gpadc: fix NULL dereference on rmmod
> iio: adc: palmas: remove adc_wakeupX_data
> iio: adc: palmas: replace "wakeup" with "event"
> iio: adc: palmas: use iio_event_direction for threshold polarity
> iio: adc: palmas: move eventX_enable into palmas_adc_event
> iio: adc: palmas: always reset events on unload
> iio: adc: palmas: add support for iio threshold events
> iio: adc: palmas: don't alter event config on suspend/resume
>
> drivers/iio/adc/palmas_gpadc.c | 616 +++++++++++++++++++++++++--------
> include/linux/mfd/palmas.h | 8 -
> 2 files changed, 478 insertions(+), 146 deletions(-)
>
>
> base-commit: f73df43e957a6fc705a9bd6d143585bdf1b13365
On Sat, 8 Apr 2023 13:48:24 +0200
Patrik Dahlstr?m <[email protected]> wrote:
> The palmas gpadc block has support for monitoring up to 2 ADC channels
> and issue an interrupt if they reach past a set threshold. This change
> hooks into the IIO events system and exposes to userspace the ability to
> configure these threshold values for each channel, but only allow up to
> 2 such thresholds to be enabled at any given time. Trying to enable a
> third channel will result in an error.
>
> Userspace is expected to input calibrated, as opposed to raw, values as
> threshold. However, it is not enough to do the opposite of what is done
> when converting the other way around. To account for tolerances in the
> ADC, the calculated raw threshold should be adjusted based on the ADC
> specifications for the device. These specifications include the integral
> nonlinearity (INL), offset, and gain error. To adjust the high
> threshold, use the following equation:
>
> (calibrated value + INL) * Gain error + offset = maximum value [1]
>
> Likewise, use the following equation for the low threshold:
>
> (calibrated value - INL) * Gain error - offset = minimum value
>
> The gain error is a combination of gain error, as listed in the
> datasheet, and gain error drift due to temperature and supply. The exact
> values for these specifications vary between palmas devices. This patch
> sets the values found in TWL6035, TWL6037 datasheet.
>
> [1] TI Application Report, SLIA087A, Guide to Using the GPADC in
> TPS65903x, TPS65917-Q1, TPS65919-Q1, and TPS65916 Devices.
>
> Signed-off-by: Patrik Dahlstr?m <[email protected]>
0-day found some stuff we'd missed in here.
I've fixed it up and pushed out again.
> ---
...
> +static int palmas_gpadc_write_event_value(struct iio_dev *indio_dev,
> + const struct iio_chan_spec *chan,
> + enum iio_event_type type,
> + enum iio_event_direction dir,
> + enum iio_event_info info,
> + int val, int val2)
> +{
> + struct palmas_gpadc *adc = iio_priv(indio_dev);
> + int adc_chan = chan->channel;
> + int old;
> + int ret;
> +
> + if (adc_chan > PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
> + return -EINVAL;
> +
> + mutex_lock(&adc->lock);
> + switch (info) {
> + case IIO_EV_INFO_VALUE:
> + if (val < 0 || val > 0xFFF) {
> + ret = -EINVAL;
> + break;
Should be goto out_unlock; Found because old is undefined.
> + }
> + if (dir == IIO_EV_DIR_RISING) {
> + old = adc->thresholds[adc_chan].high;
> + adc->thresholds[adc_chan].high = val;
> + }
Whilst here should be } else {
Tidied both up force an update on the testing branch.
> + else {
> + old = adc->thresholds[adc_chan].low;
> + adc->thresholds[adc_chan].low = val;
> + }
> + ret = 0;
> + break;
> + default:
> + ret = -EINVAL;
> + goto out_unlock;
> + }
> +
> + if (val != old && palmas_gpadc_get_event(adc, adc_chan, dir))
> + ret = palmas_gpadc_reconfigure_event_channels(adc);
> +
> +out_unlock:
> + mutex_unlock(&adc->lock);
> +
> + return ret;
> +}
> +