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hwmon: (mr75203) add debugfs to read and write temperature coefficients

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This change adds debugfs to read and write temperature sensor coefficients
- g, h, j and cal5.

The coefficients can vary between product and product, so it can be very
useful to be able to modify them on the fly during the calibration
process.

e.g.:

cat /sys/kernel/debug/940f23d0000.pvt/ts_coeff_cal5
4096

echo 83000 > sys/kernel/debug/940f23d0000.pvt/ts_coeff_g

Signed-off-by: Eliav Farber <farbere@amazon.com>
Link: https://lore.kernel.org/r/20220908152449.35457-21-farbere@amazon.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Eliav Farber 2022-09-08 15:24:48 +00:00 committed by Guenter Roeck
parent 27937d6f8e
commit a4dd0b80b4
1 changed files with 62 additions and 0 deletions
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62
drivers/hwmon/mr75203.c
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@ -9,6 +9,7 @@
*/
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/debugfs.h>
#include <linux/hwmon.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
@ -170,6 +171,7 @@ struct pvt_device {
struct regmap *v_map;
struct clk *clk;
struct reset_control *rst;
struct dentry *dbgfs_dir;
struct voltage_device *vd;
struct voltage_channels vm_channels;
struct temp_coeff ts_coeff;
@ -179,6 +181,64 @@ struct pvt_device {
u32 ip_freq;
};
static ssize_t pvt_ts_coeff_j_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
struct pvt_device *pvt = file->private_data;
unsigned int len;
char buf[13];
len = scnprintf(buf, sizeof(buf), "%d\n", pvt->ts_coeff.j);
return simple_read_from_buffer(user_buf, count, ppos, buf, len);
}
static ssize_t pvt_ts_coeff_j_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct pvt_device *pvt = file->private_data;
int ret;
ret = kstrtos32_from_user(user_buf, count, 0, &pvt->ts_coeff.j);
if (ret)
return ret;
return count;
}
static const struct file_operations pvt_ts_coeff_j_fops = {
.read = pvt_ts_coeff_j_read,
.write = pvt_ts_coeff_j_write,
.open = simple_open,
.owner = THIS_MODULE,
.llseek = default_llseek,
};
static void devm_pvt_ts_dbgfs_remove(void *data)
{
struct pvt_device *pvt = (struct pvt_device *)data;
debugfs_remove_recursive(pvt->dbgfs_dir);
pvt->dbgfs_dir = NULL;
}
static int pvt_ts_dbgfs_create(struct pvt_device *pvt, struct device *dev)
{
pvt->dbgfs_dir = debugfs_create_dir(dev_name(dev), NULL);
debugfs_create_u32("ts_coeff_h", 0644, pvt->dbgfs_dir,
&pvt->ts_coeff.h);
debugfs_create_u32("ts_coeff_g", 0644, pvt->dbgfs_dir,
&pvt->ts_coeff.g);
debugfs_create_u32("ts_coeff_cal5", 0644, pvt->dbgfs_dir,
&pvt->ts_coeff.cal5);
debugfs_create_file("ts_coeff_j", 0644, pvt->dbgfs_dir, pvt,
&pvt_ts_coeff_j_fops);
return devm_add_action_or_reset(dev, devm_pvt_ts_dbgfs_remove, pvt);
}
static umode_t pvt_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
@ -803,6 +863,8 @@ static int mr75203_probe(struct platform_device *pdev)
memset32(temp_config, HWMON_T_INPUT, ts_num);
pvt_temp.config = temp_config;
pvt_info[index++] = &pvt_temp;
pvt_ts_dbgfs_create(pvt, dev);
}
if (pd_num) {