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Date: Mon, 11 Apr 2022 11:56:34 +0200 From: Camel Guo <camel.guo@...s.com> To: <inux@...ck-us.net>, <jdelvare@...e.com>, <robh+dt@...nel.org>, <krzk+dt@...nel.org> CC: <kernel@...s.com>, Camel Guo <camel.guo@...s.com>, <linux-hwmon@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH 2/2] hwmon: (tmp401) Add support of three advanced features tmp401 driver supports TMP401, TMP411 and TMP43X temperature sensors. According to their datasheet: - all of them support extended temperature range feature; - TMP411 and TPM43X support n-factor correction feature; - TMP43X support beta compensation feature. In order to support setting them during bootup, this commit reads ti,extended-range-enable, ti,n-factor and ti,beta-compensation and set the corresponding registers during probing. Signed-off-by: Camel Guo <camel.guo@...s.com> --- drivers/hwmon/tmp401.c | 43 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/tmp401.c b/drivers/hwmon/tmp401.c index b86d9df7105d..75cdf5d2907e 100644 --- a/drivers/hwmon/tmp401.c +++ b/drivers/hwmon/tmp401.c @@ -41,6 +41,8 @@ enum chips { tmp401, tmp411, tmp431, tmp432, tmp435 }; #define TMP401_STATUS 0x02 #define TMP401_CONFIG 0x03 #define TMP401_CONVERSION_RATE 0x04 +#define TMP4XX_N_FACTOR_REG 0x18 +#define TMP43X_BETA_RANGE 0x25 #define TMP401_TEMP_CRIT_HYST 0x21 #define TMP401_MANUFACTURER_ID_REG 0xFE #define TMP401_DEVICE_ID_REG 0xFF @@ -543,6 +545,7 @@ static int tmp401_init_client(struct tmp401_data *data) struct regmap *regmap = data->regmap; u32 config, config_orig; int ret; + u32 val = 0; /* Set conversion rate to 2 Hz */ ret = regmap_write(regmap, TMP401_CONVERSION_RATE, 5); @@ -557,10 +560,48 @@ static int tmp401_init_client(struct tmp401_data *data) config_orig = config; config &= ~TMP401_CONFIG_SHUTDOWN; + if (of_property_read_bool(data->client->dev.of_node, "ti,extended-range-enable")) { + /* Enable measurement over extended temperature range */ + config |= TMP401_CONFIG_RANGE; + } + data->extended_range = !!(config & TMP401_CONFIG_RANGE); - if (config != config_orig) + if (config != config_orig) { ret = regmap_write(regmap, TMP401_CONFIG, config); + if (ret < 0) + return ret; + } + + ret = of_property_read_u32(data->client->dev.of_node, "ti,n-factor", &val); + if (!ret) { + if (data->kind == tmp401) { + dev_err(&data->client->dev, "ti,tmp401 does not support n-factor correction\n"); + return -EINVAL; + } + if (val > 255) { + dev_err(&data->client->dev, "n-factor is invalid (%u)\n", val); + return -EINVAL; + } + ret = regmap_write(regmap, TMP4XX_N_FACTOR_REG, val); + if (ret < 0) + return ret; + } + + ret = of_property_read_u32(data->client->dev.of_node, "ti,beta-compensation", &val); + if (!ret) { + if (data->kind == tmp401 || data->kind == tmp411) { + dev_err(&data->client->dev, "ti,tmp401 or ti,tmp411 does not support beta compensation\n"); + return -EINVAL; + } + if (val > 15) { + dev_err(&data->client->dev, "beta-compensation is invalid (%u)\n", val); + return -EINVAL; + } + ret = regmap_write(regmap, TMP43X_BETA_RANGE, val); + if (ret < 0) + return ret; + } return ret; } -- 2.30.2
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