diff options
Diffstat (limited to 'drivers/hwmon/ntc_thermistor.c')
| -rw-r--r-- | drivers/hwmon/ntc_thermistor.c | 353 |
1 files changed, 230 insertions, 123 deletions
diff --git a/drivers/hwmon/ntc_thermistor.c b/drivers/hwmon/ntc_thermistor.c index b5f63f9c0ce..d6d640a733d 100644 --- a/drivers/hwmon/ntc_thermistor.c +++ b/drivers/hwmon/ntc_thermistor.c @@ -26,17 +26,33 @@ #include <linux/math64.h> #include <linux/platform_device.h> #include <linux/err.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/platform_data/ntc_thermistor.h> +#include <linux/iio/iio.h> +#include <linux/iio/machine.h> +#include <linux/iio/driver.h> +#include <linux/iio/consumer.h> + #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> struct ntc_compensation { - int temp_C; + int temp_c; unsigned int ohm; }; +static const struct platform_device_id ntc_thermistor_id[] = { + { "ncp15wb473", TYPE_NCPXXWB473 }, + { "ncp18wb473", TYPE_NCPXXWB473 }, + { "ncp21wb473", TYPE_NCPXXWB473 }, + { "ncp03wb473", TYPE_NCPXXWB473 }, + { "ncp15wl333", TYPE_NCPXXWL333 }, + { }, +}; + /* * A compensation table should be sorted by the values of .ohm * in descending order. @@ -44,76 +60,76 @@ struct ntc_compensation { * Thermistors Datasheet */ static const struct ntc_compensation ncpXXwb473[] = { - { .temp_C = -40, .ohm = 1747920 }, - { .temp_C = -35, .ohm = 1245428 }, - { .temp_C = -30, .ohm = 898485 }, - { .temp_C = -25, .ohm = 655802 }, - { .temp_C = -20, .ohm = 483954 }, - { .temp_C = -15, .ohm = 360850 }, - { .temp_C = -10, .ohm = 271697 }, - { .temp_C = -5, .ohm = 206463 }, - { .temp_C = 0, .ohm = 158214 }, - { .temp_C = 5, .ohm = 122259 }, - { .temp_C = 10, .ohm = 95227 }, - { .temp_C = 15, .ohm = 74730 }, - { .temp_C = 20, .ohm = 59065 }, - { .temp_C = 25, .ohm = 47000 }, - { .temp_C = 30, .ohm = 37643 }, - { .temp_C = 35, .ohm = 30334 }, - { .temp_C = 40, .ohm = 24591 }, - { .temp_C = 45, .ohm = 20048 }, - { .temp_C = 50, .ohm = 16433 }, - { .temp_C = 55, .ohm = 13539 }, - { .temp_C = 60, .ohm = 11209 }, - { .temp_C = 65, .ohm = 9328 }, - { .temp_C = 70, .ohm = 7798 }, - { .temp_C = 75, .ohm = 6544 }, - { .temp_C = 80, .ohm = 5518 }, - { .temp_C = 85, .ohm = 4674 }, - { .temp_C = 90, .ohm = 3972 }, - { .temp_C = 95, .ohm = 3388 }, - { .temp_C = 100, .ohm = 2902 }, - { .temp_C = 105, .ohm = 2494 }, - { .temp_C = 110, .ohm = 2150 }, - { .temp_C = 115, .ohm = 1860 }, - { .temp_C = 120, .ohm = 1615 }, - { .temp_C = 125, .ohm = 1406 }, + { .temp_c = -40, .ohm = 1747920 }, + { .temp_c = -35, .ohm = 1245428 }, + { .temp_c = -30, .ohm = 898485 }, + { .temp_c = -25, .ohm = 655802 }, + { .temp_c = -20, .ohm = 483954 }, + { .temp_c = -15, .ohm = 360850 }, + { .temp_c = -10, .ohm = 271697 }, + { .temp_c = -5, .ohm = 206463 }, + { .temp_c = 0, .ohm = 158214 }, + { .temp_c = 5, .ohm = 122259 }, + { .temp_c = 10, .ohm = 95227 }, + { .temp_c = 15, .ohm = 74730 }, + { .temp_c = 20, .ohm = 59065 }, + { .temp_c = 25, .ohm = 47000 }, + { .temp_c = 30, .ohm = 37643 }, + { .temp_c = 35, .ohm = 30334 }, + { .temp_c = 40, .ohm = 24591 }, + { .temp_c = 45, .ohm = 20048 }, + { .temp_c = 50, .ohm = 16433 }, + { .temp_c = 55, .ohm = 13539 }, + { .temp_c = 60, .ohm = 11209 }, + { .temp_c = 65, .ohm = 9328 }, + { .temp_c = 70, .ohm = 7798 }, + { .temp_c = 75, .ohm = 6544 }, + { .temp_c = 80, .ohm = 5518 }, + { .temp_c = 85, .ohm = 4674 }, + { .temp_c = 90, .ohm = 3972 }, + { .temp_c = 95, .ohm = 3388 }, + { .temp_c = 100, .ohm = 2902 }, + { .temp_c = 105, .ohm = 2494 }, + { .temp_c = 110, .ohm = 2150 }, + { .temp_c = 115, .ohm = 1860 }, + { .temp_c = 120, .ohm = 1615 }, + { .temp_c = 125, .ohm = 1406 }, }; static const struct ntc_compensation ncpXXwl333[] = { - { .temp_C = -40, .ohm = 1610154 }, - { .temp_C = -35, .ohm = 1130850 }, - { .temp_C = -30, .ohm = 802609 }, - { .temp_C = -25, .ohm = 575385 }, - { .temp_C = -20, .ohm = 416464 }, - { .temp_C = -15, .ohm = 304219 }, - { .temp_C = -10, .ohm = 224193 }, - { .temp_C = -5, .ohm = 166623 }, - { .temp_C = 0, .ohm = 124850 }, - { .temp_C = 5, .ohm = 94287 }, - { .temp_C = 10, .ohm = 71747 }, - { .temp_C = 15, .ohm = 54996 }, - { .temp_C = 20, .ohm = 42455 }, - { .temp_C = 25, .ohm = 33000 }, - { .temp_C = 30, .ohm = 25822 }, - { .temp_C = 35, .ohm = 20335 }, - { .temp_C = 40, .ohm = 16115 }, - { .temp_C = 45, .ohm = 12849 }, - { .temp_C = 50, .ohm = 10306 }, - { .temp_C = 55, .ohm = 8314 }, - { .temp_C = 60, .ohm = 6746 }, - { .temp_C = 65, .ohm = 5503 }, - { .temp_C = 70, .ohm = 4513 }, - { .temp_C = 75, .ohm = 3721 }, - { .temp_C = 80, .ohm = 3084 }, - { .temp_C = 85, .ohm = 2569 }, - { .temp_C = 90, .ohm = 2151 }, - { .temp_C = 95, .ohm = 1809 }, - { .temp_C = 100, .ohm = 1529 }, - { .temp_C = 105, .ohm = 1299 }, - { .temp_C = 110, .ohm = 1108 }, - { .temp_C = 115, .ohm = 949 }, - { .temp_C = 120, .ohm = 817 }, - { .temp_C = 125, .ohm = 707 }, + { .temp_c = -40, .ohm = 1610154 }, + { .temp_c = -35, .ohm = 1130850 }, + { .temp_c = -30, .ohm = 802609 }, + { .temp_c = -25, .ohm = 575385 }, + { .temp_c = -20, .ohm = 416464 }, + { .temp_c = -15, .ohm = 304219 }, + { .temp_c = -10, .ohm = 224193 }, + { .temp_c = -5, .ohm = 166623 }, + { .temp_c = 0, .ohm = 124850 }, + { .temp_c = 5, .ohm = 94287 }, + { .temp_c = 10, .ohm = 71747 }, + { .temp_c = 15, .ohm = 54996 }, + { .temp_c = 20, .ohm = 42455 }, + { .temp_c = 25, .ohm = 33000 }, + { .temp_c = 30, .ohm = 25822 }, + { .temp_c = 35, .ohm = 20335 }, + { .temp_c = 40, .ohm = 16115 }, + { .temp_c = 45, .ohm = 12849 }, + { .temp_c = 50, .ohm = 10306 }, + { .temp_c = 55, .ohm = 8314 }, + { .temp_c = 60, .ohm = 6746 }, + { .temp_c = 65, .ohm = 5503 }, + { .temp_c = 70, .ohm = 4513 }, + { .temp_c = 75, .ohm = 3721 }, + { .temp_c = 80, .ohm = 3084 }, + { .temp_c = 85, .ohm = 2569 }, + { .temp_c = 90, .ohm = 2151 }, + { .temp_c = 95, .ohm = 1809 }, + { .temp_c = 100, .ohm = 1529 }, + { .temp_c = 105, .ohm = 1299 }, + { .temp_c = 110, .ohm = 1108 }, + { .temp_c = 115, .ohm = 949 }, + { .temp_c = 120, .ohm = 817 }, + { .temp_c = 125, .ohm = 707 }, }; struct ntc_data { @@ -125,6 +141,92 @@ struct ntc_data { char name[PLATFORM_NAME_SIZE]; }; +#ifdef CONFIG_OF +static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata) +{ + struct iio_channel *channel = pdata->chan; + unsigned int result; + int val, ret; + + ret = iio_read_channel_raw(channel, &val); + if (ret < 0) { + pr_err("read channel() error: %d\n", ret); + return ret; + } + + /* unit: mV */ + result = pdata->pullup_uv * val; + result >>= 12; + + return result; +} + +static const struct of_device_id ntc_match[] = { + { .compatible = "ntc,ncp15wb473", + .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, + { .compatible = "ntc,ncp18wb473", + .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, + { .compatible = "ntc,ncp21wb473", + .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, + { .compatible = "ntc,ncp03wb473", + .data = &ntc_thermistor_id[TYPE_NCPXXWB473] }, + { .compatible = "ntc,ncp15wl333", + .data = &ntc_thermistor_id[TYPE_NCPXXWL333] }, + { }, +}; +MODULE_DEVICE_TABLE(of, ntc_match); + +static struct ntc_thermistor_platform_data * +ntc_thermistor_parse_dt(struct platform_device *pdev) +{ + struct iio_channel *chan; + struct device_node *np = pdev->dev.of_node; + struct ntc_thermistor_platform_data *pdata; + + if (!np) + return NULL; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) + return ERR_PTR(-ENOMEM); + + chan = iio_channel_get(&pdev->dev, NULL); + if (IS_ERR(chan)) + return ERR_CAST(chan); + + if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uv)) + return ERR_PTR(-ENODEV); + if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm)) + return ERR_PTR(-ENODEV); + if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm)) + return ERR_PTR(-ENODEV); + + if (of_find_property(np, "connected-positive", NULL)) + pdata->connect = NTC_CONNECTED_POSITIVE; + else /* status change should be possible if not always on. */ + pdata->connect = NTC_CONNECTED_GROUND; + + pdata->chan = chan; + pdata->read_uv = ntc_adc_iio_read; + + return pdata; +} +static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) +{ + if (pdata->chan) + iio_channel_release(pdata->chan); +} +#else +static struct ntc_thermistor_platform_data * +ntc_thermistor_parse_dt(struct platform_device *pdev) +{ + return NULL; +} + +static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata) +{ } +#endif + static inline u64 div64_u64_safe(u64 dividend, u64 divisor) { if (divisor == 0 && dividend == 0) @@ -134,37 +236,37 @@ static inline u64 div64_u64_safe(u64 dividend, u64 divisor) return div64_u64(dividend, divisor); } -static int get_ohm_of_thermistor(struct ntc_data *data, unsigned int uV) +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; - u64 N, puO, pdO; - puO = pdata->pullup_ohm; - pdO = pdata->pulldown_ohm; + u64 mv = uv / 1000; + u64 pmv = pdata->pullup_uv / 1000; + u64 n, puo, pdo; + puo = pdata->pullup_ohm; + pdo = pdata->pulldown_ohm; - if (mV == 0) { + if (mv == 0) { if (pdata->connect == NTC_CONNECTED_POSITIVE) return INT_MAX; return 0; } - if (mV >= pmV) + if (mv >= pmv) 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); - else if (pdata->connect == NTC_CONNECTED_GROUND && pdO == 0) - N = div64_u64_safe(puO * mV, pmV - mV); + if (pdata->connect == NTC_CONNECTED_POSITIVE && puo == 0) + n = div64_u64_safe(pdo * (pmv - mv), mv); + else if (pdata->connect == NTC_CONNECTED_GROUND && pdo == 0) + n = div64_u64_safe(puo * mv, pmv - mv); 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 * (pmv - mv), + puo * mv - pdo * (pmv - mv)); else - N = div64_u64_safe(pdO * puO * mV, pdO * (pmV - mV) - puO * mV); + n = div64_u64_safe(pdo * puo * mv, pdo * (pmv - mv) - puo * mv); - if (N > INT_MAX) - N = INT_MAX; - return N; + if (n > INT_MAX) + n = INT_MAX; + return n; } static void lookup_comp(struct ntc_data *data, unsigned int ohm, @@ -233,7 +335,7 @@ static void lookup_comp(struct ntc_data *data, unsigned int ohm, *i_high = end - 1; } -static int get_temp_mC(struct ntc_data *data, unsigned int ohm) +static int get_temp_mc(struct ntc_data *data, unsigned int ohm) { int low, high; int temp; @@ -241,10 +343,10 @@ static int get_temp_mC(struct ntc_data *data, unsigned int ohm) lookup_comp(data, ohm, &low, &high); if (low == high) { /* Unable to use linear approximation */ - temp = data->comp[low].temp_C * 1000; + temp = data->comp[low].temp_c * 1000; } else { - temp = data->comp[low].temp_C * 1000 + - ((data->comp[high].temp_C - data->comp[low].temp_C) * + temp = data->comp[low].temp_c * 1000 + + ((data->comp[high].temp_c - data->comp[low].temp_c) * 1000 * ((int)ohm - (int)data->comp[low].ohm)) / ((int)data->comp[high].ohm - (int)data->comp[low].ohm); } @@ -253,16 +355,16 @@ static int get_temp_mC(struct ntc_data *data, unsigned int ohm) static int ntc_thermistor_get_ohm(struct ntc_data *data) { - int read_uV; + int read_uv; if (data->pdata->read_ohm) return data->pdata->read_ohm(); - if (data->pdata->read_uV) { - read_uV = data->pdata->read_uV(); - if (read_uV < 0) - return read_uV; - return get_ohm_of_thermistor(data, read_uV); + if (data->pdata->read_uv) { + read_uv = data->pdata->read_uv(data->pdata); + if (read_uv < 0) + return read_uv; + return get_ohm_of_thermistor(data, read_uv); } return -EINVAL; } @@ -291,7 +393,7 @@ static ssize_t ntc_show_temp(struct device *dev, if (ohm < 0) return ohm; - return sprintf(buf, "%d\n", get_temp_mC(data, ohm)); + return sprintf(buf, "%d\n", get_temp_mc(data, ohm)); } static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO, ntc_show_type, NULL, 0); @@ -311,9 +413,18 @@ static const struct attribute_group ntc_attr_group = { static int ntc_thermistor_probe(struct platform_device *pdev) { + const struct of_device_id *of_id = + of_match_device(of_match_ptr(ntc_match), &pdev->dev); + const struct platform_device_id *pdev_id; + struct ntc_thermistor_platform_data *pdata; struct ntc_data *data; - struct ntc_thermistor_platform_data *pdata = pdev->dev.platform_data; - int ret = 0; + int ret; + + pdata = ntc_thermistor_parse_dt(pdev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + else if (pdata == NULL) + pdata = pdev->dev.platform_data; if (!pdata) { dev_err(&pdev->dev, "No platform init data supplied.\n"); @@ -321,19 +432,19 @@ static int ntc_thermistor_probe(struct platform_device *pdev) } /* Either one of the two is required. */ - if (!pdata->read_uV && !pdata->read_ohm) { + if (!pdata->read_uv && !pdata->read_ohm) { dev_err(&pdev->dev, - "Both read_uV and read_ohm missing. Need either one of the two.\n"); + "Both read_uv and read_ohm missing. Need either one of the two.\n"); return -EINVAL; } - if (pdata->read_uV && pdata->read_ohm) { + if (pdata->read_uv && pdata->read_ohm) { dev_warn(&pdev->dev, - "Only one of read_uV and read_ohm is needed; ignoring read_uV.\n"); - pdata->read_uV = NULL; + "Only one of read_uv and read_ohm is needed; ignoring read_uv.\n"); + pdata->read_uv = NULL; } - if (pdata->read_uV && (pdata->pullup_uV == 0 || + if (pdata->read_uv && (pdata->pullup_uv == 0 || (pdata->pullup_ohm == 0 && pdata->connect == NTC_CONNECTED_GROUND) || (pdata->pulldown_ohm == 0 && pdata->connect == @@ -341,7 +452,7 @@ static int ntc_thermistor_probe(struct platform_device *pdev) (pdata->connect != NTC_CONNECTED_POSITIVE && pdata->connect != NTC_CONNECTED_GROUND))) { dev_err(&pdev->dev, - "Required data to use read_uV not supplied.\n"); + "Required data to use read_uv not supplied.\n"); return -EINVAL; } @@ -349,11 +460,13 @@ static int ntc_thermistor_probe(struct platform_device *pdev) if (!data) return -ENOMEM; + pdev_id = of_id ? of_id->data : platform_get_device_id(pdev); + data->dev = &pdev->dev; data->pdata = pdata; - strlcpy(data->name, pdev->id_entry->name, sizeof(data->name)); + strlcpy(data->name, pdev_id->name, sizeof(data->name)); - switch (pdev->id_entry->driver_data) { + switch (pdev_id->driver_data) { case TYPE_NCPXXWB473: data->comp = ncpXXwb473; data->n_comp = ARRAY_SIZE(ncpXXwb473); @@ -364,8 +477,7 @@ static int ntc_thermistor_probe(struct platform_device *pdev) break; default: dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n", - pdev->id_entry->driver_data, - pdev->id_entry->name); + pdev_id->driver_data, pdev_id->name); return -EINVAL; } @@ -384,39 +496,34 @@ static int ntc_thermistor_probe(struct platform_device *pdev) goto err_after_sysfs; } - dev_info(&pdev->dev, "Thermistor %s:%d (type: %s/%lu) successfully probed.\n", - pdev->name, pdev->id, pdev->id_entry->name, - pdev->id_entry->driver_data); + dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n", + pdev->name); + return 0; err_after_sysfs: sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); + ntc_iio_channel_release(pdata); return ret; } static int ntc_thermistor_remove(struct platform_device *pdev) { struct ntc_data *data = platform_get_drvdata(pdev); + struct ntc_thermistor_platform_data *pdata = data->pdata; hwmon_device_unregister(data->hwmon_dev); sysfs_remove_group(&data->dev->kobj, &ntc_attr_group); + ntc_iio_channel_release(pdata); platform_set_drvdata(pdev, NULL); return 0; } -static const struct platform_device_id ntc_thermistor_id[] = { - { "ncp15wb473", TYPE_NCPXXWB473 }, - { "ncp18wb473", TYPE_NCPXXWB473 }, - { "ncp21wb473", TYPE_NCPXXWB473 }, - { "ncp03wb473", TYPE_NCPXXWB473 }, - { "ncp15wl333", TYPE_NCPXXWL333 }, - { }, -}; - static struct platform_driver ntc_thermistor_driver = { .driver = { .name = "ntc-thermistor", .owner = THIS_MODULE, + .of_match_table = of_match_ptr(ntc_match), }, .probe = ntc_thermistor_probe, .remove = ntc_thermistor_remove, |