nv-tegra-mirror/linux-nv-oot
1
0
Fork 0
mirror of git://nv-tegra.nvidia.com/linux-nv-oot.git synced 2025-12-22 09:11:26 +03:00
Code Issues Packages Projects Releases Wiki Activity

tach: Add show_rpm attribute on pwm-tegra-tach

Browse Source 
Below changes are supported:
  - Added show rpm attribute to pwm-tegra-tachometer
  - Added HWMON registration for pwm-tegra-tachometer
  - Disbale interrupt to skip overrun/underrun configurations, so that
    rpm regiseter is configured properly to provide correct rpm reading.

Bug 3771589

Change-Id: Ie4a45eab03c4dbefb3b5abfd76f8dba8909d61ec
Signed-off-by: Sandipan Patra <spatra@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/2768987
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: Krishna Yarlagadda <kyarlagadda@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
This commit is contained in:
Sandipan Patra
2022-08-30 19:39:12 +05:30
committed by mobile promotions
parent cd6fe5db1d
commit 9b754839fb
1 changed files with 48 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
drivers/pwm/pwm-tegra-tachometer.c
View File

@@ -12,7 +12,9 @@
#include <linux/reset.h>
#include <linux/of_device.h>
#include <linux/io.h>
#define DRIVER_NAME "pwm-tach"
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#define DRIVER_NAME "pwm_tach"
/* Since oscillator clock (38.4MHz) serves as a clock source for
* the tach input controller, 1.0105263MHz (i.e. 38.4/38) has to be
@@ -91,6 +93,37 @@ struct pwm_tegra_tach {
const struct pwm_tegra_tach_soc_data *soc_data;
};
static ssize_t rpm_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct pwm_tegra_tach *ptt = dev_get_drvdata(dev);
struct pwm_device *pwm = &ptt->chip.pwms[0];
struct pwm_capture result;
unsigned int rpm = 0;
int ret;
ret = pwm_capture(pwm, &result, 0);
if (ret < 0) {
dev_err(ptt->dev, "Failed to capture PWM: %d\n", ret);
return ret;
}
if (result.period)
rpm = DIV_ROUND_CLOSEST_ULL(60ULL * NSEC_PER_SEC,
result.period);
return sprintf(buf, "%u\n", rpm);
}
static DEVICE_ATTR_RO(rpm);
static struct attribute *pwm_tach_attrs[] = {
&dev_attr_rpm.attr,
NULL,
};
ATTRIBUTE_GROUPS(pwm_tach);
static struct pwm_tegra_tach *to_tegra_pwm_chip(struct pwm_chip *chip)
{
return container_of(chip, struct pwm_tegra_tach, chip);
@@ -299,6 +332,7 @@ static int pwm_tegra_tach_probe(struct platform_device *pdev)
{
struct pwm_tegra_tach *ptt;
struct pwm_device *pwm;
struct device *hwmon;
struct resource *r;
int ret;
@@ -353,7 +387,11 @@ static int pwm_tegra_tach_probe(struct platform_device *pdev)
goto clk_unprep;
}
reset_control_reset(ptt->rst);
ret = reset_control_reset(ptt->rst);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to reset: %d\n", ret);
goto clk_unprep;
}
if (ptt->soc_data->has_interrupt_support) {
ptt->irq = platform_get_irq(pdev, 0);
@@ -413,6 +451,13 @@ static int pwm_tegra_tach_probe(struct platform_device *pdev)
TACH_FAN_ENABLE_INTERRUPT_SHIFT);
}
hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, DRIVER_NAME, ptt, pwm_tach_groups);
if (IS_ERR(hwmon)) {
dev_warn(&pdev->dev, "Failed to register hwmon device: %d\n", PTR_ERR_OR_ZERO(hwmon));
dev_warn(&pdev->dev, "Tegra Tachometer got registered witout hwmon sysfs support\n");
}
return 0;
pwm_remove:
@@ -472,7 +517,7 @@ static struct pwm_tegra_tach_soc_data tegra194_tach_soc_data = {
};
static struct pwm_tegra_tach_soc_data tegra234_tach_soc_data = {
.has_interrupt_support = true,
.has_interrupt_support = false,
};
static const struct of_device_id pwm_tegra_tach_of_match[] = {