diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-23 13:39:56 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-23 13:39:56 -0700 |
commit | 234a56c80a6aa7a05fec05d8b7184354d8765b48 (patch) | |
tree | 12f8a05b005ced034316a8c865b51cdbe3f79802 /drivers/hwmon/ntc_thermistor.c | |
parent | a57f14bac07f63118d947f53976d7f15c04b062a (diff) | |
parent | 761c1770f2bf36a323ab97e2e1780db4f9b8a6fe (diff) |
Merge tag 'hwmon-for-linus-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
Pull hwmon updates from Guenter Roeck:
- new driver for Microchip TC74
- support for ncpXXwf104 added to ntc_thermistor driver
- minor cleanup
* tag 'hwmon-for-linus-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
hwmon: add driver for Microchip TC74
hwmon: (ntc_thermistor) Improve precision of resistance calculation
hwmon: (ntc_thermistor) fix iio raw to microvolts conversion
hwmon: (atxp1) Drop auto-detection
hwmon: (atxp1) Drop FSF mailing address
hwmon: Allow compile test of GPIO consumers if !GPIOLIB
hwmon: (sht15) Constify platform_device_id
hwmon: (max197) Constify platform_device_id
hwmon: (ntc_thermistor) Add support for ncpXXwf104
Diffstat (limited to 'drivers/hwmon/ntc_thermistor.c')
-rw-r--r-- | drivers/hwmon/ntc_thermistor.c | 82 |
1 files changed, 62 insertions, 20 deletions
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c index 68800115876b..dc0b76c5e302 100644 --- a/drivers/hwmon/ntc_thermistor.c +++ b/drivers/hwmon/ntc_thermistor.c @@ -53,6 +53,7 @@ static const struct platform_device_id ntc_thermistor_id[] = { { "ncp03wb473", TYPE_NCPXXWB473 }, { "ncp15wl333", TYPE_NCPXXWL333 }, { "b57330v2103", TYPE_B57330V2103}, + { "ncp03wf104", TYPE_NCPXXWF104 }, { }, }; @@ -135,6 +136,43 @@ static const struct ntc_compensation ncpXXwl333[] = { { .temp_c = 125, .ohm = 707 }, }; +static const struct ntc_compensation ncpXXwf104[] = { + { .temp_c = -40, .ohm = 4397119 }, + { .temp_c = -35, .ohm = 3088599 }, + { .temp_c = -30, .ohm = 2197225 }, + { .temp_c = -25, .ohm = 1581881 }, + { .temp_c = -20, .ohm = 1151037 }, + { .temp_c = -15, .ohm = 846579 }, + { .temp_c = -10, .ohm = 628988 }, + { .temp_c = -5, .ohm = 471632 }, + { .temp_c = 0, .ohm = 357012 }, + { .temp_c = 5, .ohm = 272500 }, + { .temp_c = 10, .ohm = 209710 }, + { .temp_c = 15, .ohm = 162651 }, + { .temp_c = 20, .ohm = 127080 }, + { .temp_c = 25, .ohm = 100000 }, + { .temp_c = 30, .ohm = 79222 }, + { .temp_c = 35, .ohm = 63167 }, + { .temp_c = 40, .ohm = 50677 }, + { .temp_c = 45, .ohm = 40904 }, + { .temp_c = 50, .ohm = 33195 }, + { .temp_c = 55, .ohm = 27091 }, + { .temp_c = 60, .ohm = 22224 }, + { .temp_c = 65, .ohm = 18323 }, + { .temp_c = 70, .ohm = 15184 }, + { .temp_c = 75, .ohm = 12635 }, + { .temp_c = 80, .ohm = 10566 }, + { .temp_c = 85, .ohm = 8873 }, + { .temp_c = 90, .ohm = 7481 }, + { .temp_c = 95, .ohm = 6337 }, + { .temp_c = 100, .ohm = 5384 }, + { .temp_c = 105, .ohm = 4594 }, + { .temp_c = 110, .ohm = 3934 }, + { .temp_c = 115, .ohm = 3380 }, + { .temp_c = 120, .ohm = 2916 }, + { .temp_c = 125, .ohm = 2522 }, +}; + /* * The following compensation table is from the specification of EPCOS NTC * Thermistors Datasheet @@ -190,20 +228,21 @@ struct ntc_data { static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) { struct iio_channel *channel = pdata->chan; - s64 result; - int val, ret; + int raw, uv, ret; - ret = iio_read_channel_raw(channel, &val); + ret = iio_read_channel_raw(channel, &raw); if (ret < 0) { pr_err("read channel() error: %d\n", ret); return ret; } - /* unit: mV */ - result = pdata->pullup_uv * (s64) val; - result >>= 12; + ret = iio_convert_raw_to_processed(channel, raw, &uv, 1000); + if (ret < 0) { + /* Assume 12 bit ADC with vref at pullup_uv */ + uv = (pdata->pullup_uv * (s64)raw) >> 12; + } - return (int)result; + return uv; } static const struct of_device_id ntc_match[] = { @@ -219,6 +258,8 @@ static const struct of_device_id ntc_match[] = { .data = &ntc_thermistor_id[4] }, { .compatible = "epcos,b57330v2103", .data = &ntc_thermistor_id[5]}, + { .compatible = "murata,ncp03wf104", + .data = &ntc_thermistor_id[6] }, /* Usage of vendor name "ntc" is deprecated */ { .compatible = "ntc,ncp15wb473", @@ -309,30 +350,27 @@ static inline u64 div64_u64_safe(u64 dividend, u64 divisor) static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uv) { struct ntc_thermistor_platform_data *pdata = data->pdata; - u64 mv = uv / 1000; - u64 pmv = pdata->pullup_uv / 1000; + u32 puv = pdata->pullup_uv; u64 n, puo, pdo; puo = pdata->pullup_ohm; pdo = pdata->pulldown_ohm; - if (mv == 0) { - if (pdata->connect == NTC_CONNECTED_POSITIVE) - return INT_MAX; - return 0; - } - if (mv >= pmv) + if (uv == 0) + return (pdata->connect == NTC_CONNECTED_POSITIVE) ? + INT_MAX : 0; + if (uv >= puv) return (pdata->connect == NTC_CONNECTED_POSITIVE) ? 0 : INT_MAX; if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) - n = div64_u64_safe(pdo * (pmv - mv), mv); + n = div_u64(pdo * (puv - uv), uv); else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) - n = div64_u64_safe(puo * mv, pmv - mv); + n = div_u64(puo * uv, puv - uv); else if (pdata->connect == NTC_CONNECTED_POSITIVE) - n = div64_u64_safe(pdo * puo * (pmv - mv), - puo * mv - pdo * (pmv - mv)); + n = div64_u64_safe(pdo * puo * (puv - uv), + puo * uv - pdo * (puv - uv)); else - n = div64_u64_safe(pdo * puo * mv, pdo * (pmv - mv) - puo * mv); + n = div64_u64_safe(pdo * puo * uv, pdo * (puv - uv) - puo * uv); if (n > INT_MAX) n = INT_MAX; @@ -567,6 +605,10 @@ static int ntc_thermistor_probe(struct platform_device *pdev) data->comp = b57330v2103; data->n_comp = ARRAY_SIZE(b57330v2103); break; + case TYPE_NCPXXWF104: + data->comp = ncpXXwf104; + data->n_comp = ARRAY_SIZE(ncpXXwf104); + break; default: dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n", pdev_id->driver_data, pdev_id->name); |