| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <20181105204843.4081-5-nicoleotsuka@gmail.com>
Date: Mon, 5 Nov 2018 12:48:43 -0800
From: Nicolin Chen <nicoleotsuka@...il.com>
To: jdelvare@...e.com, linux@...ck-us.net
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 4/4] hwmon: (ina3221) Add PM runtime support
If all three channels are disabled via in[123]_enable ABI,
the driver could suspend the chip for power saving purpose.
So this patch adds the PM runtime support in order to gain
more power control than system suspend and resume use case.
For PM runtime, there are a few related changes happening:
1) Added a new pm_dev device pointer for all the PM runtime
callbacks. This is because hwmon core registers a child
device for each hwmon driver and passes it back to each
driver. So there might be a mismatch between two device
pointers in the driver if mixing using them.
2) Added a check in ina3221_is_enabled() to make sure that
the chip is resumed.
3) Bypassed the unchanged status in ina3221_write_enable()
in order to keep the PM runtime refcount being matched.
4) Removed the reset routine in the probe() by calling the
resume() via pm_runtime_get_sync() instead, as they're
similar. It's also necessary to do so to match initial
PM refcount with the number of enabled channels.
Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
---
Changelog
v4->v5:
* Dropped the code of passing pm pointer via _info API
** Moved all changes back to the status of v3
* Used i2c_client dev pointer for pm runtime callbacks
v3->v4:
* Passed pm pointer via _with_info API instead the i2c driver
v2->v3:
* Improved a dev_err message
* Added comments at pm_runtime_put_noidle() callbacks
* Added pm_runtime header file in an alphabetical order
v1->v2:
* Bypassed i2c_client->dev in suspend/resume()
* Added a missing '\n' in one dev_err()
drivers/hwmon/ina3221.c | 93 ++++++++++++++++++++++++++++++++---------
1 file changed, 74 insertions(+), 19 deletions(-)
diff --git a/drivers/hwmon/ina3221.c b/drivers/hwmon/ina3221.c
index 07dd6ef58d3e..17a57dbc0424 100644
--- a/drivers/hwmon/ina3221.c
+++ b/drivers/hwmon/ina3221.c
@@ -20,6 +20,7 @@
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#define INA3221_DRIVER_NAME "ina3221"
@@ -53,6 +54,7 @@
#define INA3221_CONFIG_CHs_EN_MASK GENMASK(14, 12)
#define INA3221_CONFIG_CHx_EN(x) BIT(14 - (x))
+#define INA3221_CONFIG_DEFAULT 0x7127
#define INA3221_RSHUNT_DEFAULT 10000
enum ina3221_fields {
@@ -103,6 +105,7 @@ struct ina3221_input {
/**
* struct ina3221_data - device specific information
+ * @pm_dev: Device pointer for pm runtime
* @regmap: Register map of the device
* @fields: Register fields of the device
* @inputs: Array of channel input source specific structures
@@ -110,6 +113,7 @@ struct ina3221_input {
* @reg_config: Register value of INA3221_CONFIG
*/
struct ina3221_data {
+ struct device *pm_dev;
struct regmap *regmap;
struct regmap_field *fields[F_MAX_FIELDS];
struct ina3221_input inputs[INA3221_NUM_CHANNELS];
@@ -119,7 +123,8 @@ struct ina3221_data {
static inline bool ina3221_is_enabled(struct ina3221_data *ina, int channel)
{
- return ina->reg_config & INA3221_CONFIG_CHx_EN(channel);
+ return pm_runtime_active(ina->pm_dev) &&
+ (ina->reg_config & INA3221_CONFIG_CHx_EN(channel));
}
/* Lookup table for Bus and Shunt conversion times in usec */
@@ -290,21 +295,48 @@ static int ina3221_write_enable(struct device *dev, int channel, bool enable)
{
struct ina3221_data *ina = dev_get_drvdata(dev);
u16 config, mask = INA3221_CONFIG_CHx_EN(channel);
+ u16 config_old = ina->reg_config & mask;
int ret;
config = enable ? mask : 0;
+ /* Bypass if enable status is not being changed */
+ if (config_old == config)
+ return 0;
+
+ /* For enabling routine, increase refcount and resume() at first */
+ if (enable) {
+ ret = pm_runtime_get_sync(ina->pm_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to get PM runtime\n");
+ return ret;
+ }
+ }
+
/* Enable or disable the channel */
ret = regmap_update_bits(ina->regmap, INA3221_CONFIG, mask, config);
if (ret)
- return ret;
+ goto fail;
/* Cache the latest config register value */
ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
if (ret)
- return ret;
+ goto fail;
+
+ /* For disabling routine, decrease refcount or suspend() at last */
+ if (!enable)
+ pm_runtime_put_sync(ina->pm_dev);
return 0;
+
+fail:
+ if (enable) {
+ dev_err(dev, "Failed to enable channel %d: error %d\n",
+ channel, ret);
+ pm_runtime_put_sync(ina->pm_dev);
+ }
+
+ return ret;
}
static int ina3221_read(struct device *dev, enum hwmon_sensor_types type,
@@ -631,44 +663,65 @@ static int ina3221_probe(struct i2c_client *client,
return ret;
}
- ret = regmap_field_write(ina->fields[F_RST], true);
- if (ret) {
- dev_err(dev, "Unable to reset device\n");
- return ret;
- }
-
- /* Sync config register after reset */
- ret = regmap_read(ina->regmap, INA3221_CONFIG, &ina->reg_config);
- if (ret)
- return ret;
+ /* The driver will be reset, so use reset value */
+ ina->reg_config = INA3221_CONFIG_DEFAULT;
/* Disable channels if their inputs are disconnected */
for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
if (ina->inputs[i].disconnected)
ina->reg_config &= ~INA3221_CONFIG_CHx_EN(i);
}
- ret = regmap_write(ina->regmap, INA3221_CONFIG, ina->reg_config);
- if (ret)
- return ret;
+ ina->pm_dev = dev;
mutex_init(&ina->lock);
dev_set_drvdata(dev, ina);
+ /* Enable PM runtime -- status is suspended by default */
+ pm_runtime_enable(ina->pm_dev);
+
+ /* Initialize (resume) the device */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++) {
+ if (ina->inputs[i].disconnected)
+ continue;
+ /* Match the refcount with number of enabled channels */
+ ret = pm_runtime_get_sync(ina->pm_dev);
+ if (ret < 0)
+ goto fail;
+ }
+
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, ina,
&ina3221_chip_info,
ina3221_groups);
if (IS_ERR(hwmon_dev)) {
dev_err(dev, "Unable to register hwmon device\n");
- mutex_destroy(&ina->lock);
- return PTR_ERR(hwmon_dev);
+ ret = PTR_ERR(hwmon_dev);
+ goto fail;
}
return 0;
+
+fail:
+ pm_runtime_disable(ina->pm_dev);
+ pm_runtime_set_suspended(ina->pm_dev);
+ /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++)
+ pm_runtime_put_noidle(ina->pm_dev);
+ mutex_destroy(&ina->lock);
+
+ return ret;
}
static int ina3221_remove(struct i2c_client *client)
{
struct ina3221_data *ina = dev_get_drvdata(&client->dev);
+ int i;
+
+ pm_runtime_disable(ina->pm_dev);
+ pm_runtime_set_suspended(ina->pm_dev);
+
+ /* pm_runtime_put_noidle() will decrease the PM refcount until 0 */
+ for (i = 0; i < INA3221_NUM_CHANNELS; i++)
+ pm_runtime_put_noidle(ina->pm_dev);
mutex_destroy(&ina->lock);
@@ -726,7 +779,9 @@ static int __maybe_unused ina3221_resume(struct device *dev)
}
static const struct dev_pm_ops ina3221_pm = {
- SET_SYSTEM_SLEEP_PM_OPS(ina3221_suspend, ina3221_resume)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(ina3221_suspend, ina3221_resume, NULL)
};
static const struct of_device_id ina3221_of_match_table[] = {
--
2.17.1
Powered by blists - more mailing lists