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@xxxxxxxxxx>
---
V5 -> V4:
- Return j coefficient to use debugfs_create_file() instead of
debugfs_create_u32() because j is signed.
V4 -> V3:
- Remove check of the debugfs_create_dir() return value.
- Use debugfs_create_u32() instead of debugfs_create_file().
- Return devm_add_action_or_reset() without checking return value and printing
an error message on failure.
drivers/hwmon/mr75203.c | 62 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
index 07668545c3ae..e6b49f810307 100644
--- a/drivers/hwmon/mr75203.c
+++ b/drivers/hwmon/mr75203.c
@@ -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)
{
@@ -813,6 +873,8 @@ 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) {
--
2.37.1
