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| author | Adamski, Krzysztof (Nokia - PL/Wroclaw) <krzysztof.adamski@nokia.com> | 2019-04-14 21:59:19 +0000 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2019-04-15 17:19:53 -0700 |
| commit | 5d9e8b3f809f1c12e32fea7061ad2319d2848600 (patch) | |
| tree | 0e26a07d7d8cb5398f210ec9b95e4029772995ad /drivers | |
| parent | bfe033a048f7ce486e01f3ef5a7a24618088af44 (diff) | |
| download | lwn-5d9e8b3f809f1c12e32fea7061ad2319d2848600.tar.gz lwn-5d9e8b3f809f1c12e32fea7061ad2319d2848600.zip | |
hwmon: (lm25066) Support SAMPLES_FOR_AVG register
Manufacturer specific SAMPLES_FOR_AVG register allows setting the number
of samples used in computing the average values (PMBUS_VIRT_READ_*_AVG).
The number we write is an exponent of base 2 of the number of samples so
for example writing 3 will result in 8 samples average.
Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/hwmon/pmbus/lm25066.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/drivers/hwmon/pmbus/lm25066.c b/drivers/hwmon/pmbus/lm25066.c index 53db78753a0d..715d4ab57516 100644 --- a/drivers/hwmon/pmbus/lm25066.c +++ b/drivers/hwmon/pmbus/lm25066.c @@ -26,6 +26,7 @@ #include <linux/err.h> #include <linux/slab.h> #include <linux/i2c.h> +#include <linux/log2.h> #include "pmbus.h" enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i }; @@ -39,12 +40,15 @@ enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i }; #define LM25066_CLEAR_PIN_PEAK 0xd6 #define LM25066_DEVICE_SETUP 0xd9 #define LM25066_READ_AVG_VIN 0xdc +#define LM25066_SAMPLES_FOR_AVG 0xdb #define LM25066_READ_AVG_VOUT 0xdd #define LM25066_READ_AVG_IIN 0xde #define LM25066_READ_AVG_PIN 0xdf #define LM25066_DEV_SETUP_CL BIT(4) /* Current limit */ +#define LM25066_SAMPLES_FOR_AVG_MAX 4096 + /* LM25056 only */ #define LM25056_VAUX_OV_WARN_LIMIT 0xe3 @@ -284,6 +288,12 @@ static int lm25066_read_word_data(struct i2c_client *client, int page, int reg) case PMBUS_VIRT_RESET_PIN_HISTORY: ret = 0; break; + case PMBUS_VIRT_SAMPLES: + ret = pmbus_read_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG); + if (ret < 0) + break; + ret = 1 << ret; + break; default: ret = -ENODATA; break; @@ -398,6 +408,11 @@ static int lm25066_write_word_data(struct i2c_client *client, int page, int reg, case PMBUS_VIRT_RESET_PIN_HISTORY: ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK); break; + case PMBUS_VIRT_SAMPLES: + word = clamp_val(word, 1, LM25066_SAMPLES_FOR_AVG_MAX); + ret = pmbus_write_byte_data(client, 0, LM25066_SAMPLES_FOR_AVG, + ilog2(word)); + break; default: ret = -ENODATA; break; @@ -438,7 +453,7 @@ static int lm25066_probe(struct i2c_client *client, info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VMON | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN | PMBUS_HAVE_STATUS_INPUT - | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP; + | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | PMBUS_HAVE_SAMPLES; if (data->id == lm25056) { info->func[0] |= PMBUS_HAVE_STATUS_VMON; |