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Tue, 7 Sep 2021 13:46:04 +0000 Date: Tue, 7 Sep 2021 15:46:00 +0200 From: Krzysztof Adamski To: Guenter Roeck , Jean Delvare Cc: Rob Herring , linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH 7/8] hwmon: (tmp421) really disable channels Message-ID: References: Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: HE1P18901CA0001.EURP189.PROD.OUTLOOK.COM (2603:10a6:3:8b::11) To DU2PR07MB8110.eurprd07.prod.outlook.com (2603:10a6:10:239::15) MIME-Version: 1.0 Received: from localhost.localdomain (131.228.2.20) by HE1P18901CA0001.EURP189.PROD.OUTLOOK.COM (2603:10a6:3:8b::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4500.14 via Frontend Transport; Tue, 7 Sep 2021 13:46:03 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 16b78887-2f8a-40e6-e2b8-08d97205d60c X-MS-TrafficTypeDiagnostic: DU2PR07MB8303: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8273; 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That would only make sure that the ENODATA is returned for those channels but would not configure the actual hardware. With this patch, the config register is written to make sure the channels are disabled also at hardware level. Signed-off-by: Krzysztof Adamski --- drivers/hwmon/tmp421.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c index 90c6b094785e..cec25fb1c771 100644 --- a/drivers/hwmon/tmp421.c +++ b/drivers/hwmon/tmp421.c @@ -33,6 +33,8 @@ enum chips { tmp421, tmp422, tmp423, tmp441, tmp442 }; /* The TMP421 registers */ #define TMP421_STATUS_REG 0x08 #define TMP421_CONFIG_REG_1 0x09 +#define TMP421_CONFIG_REG_2 0x0A +#define TMP421_CONFIG_REG_REN(x) (BIT(3 + (x))) #define TMP421_CONVERSION_RATE_REG 0x0B #define TMP421_N_FACTOR_REG_1 0x21 #define TMP421_MANUFACTURER_ID_REG 0xFE @@ -351,6 +353,25 @@ void tmp421_probe_from_dt(struct i2c_client *client, struct tmp421_data *data) } } +void tmp421_disable_channels(struct i2c_client *client, uint8_t mask) +{ + int err; + int cfg = i2c_smbus_read_byte_data(client, TMP421_CONFIG_REG_2); + + if (cfg < 0) { + dev_err(&client->dev, + "error reading register, can't disable channels\n"); + return; + } + + cfg &= ~mask; + + err = i2c_smbus_write_byte_data(client, TMP421_CONFIG_REG_2, cfg); + if (err < 0) + dev_err(&client->dev, + "error writing register, can't disable channels\n"); +} + static const struct hwmon_ops tmp421_ops = { .is_visible = tmp421_is_visible, .read = tmp421_read, @@ -363,6 +384,7 @@ static int tmp421_probe(struct i2c_client *client) struct device *hwmon_dev; struct tmp421_data *data; int i, err; + u8 disable = 0; data = devm_kzalloc(dev, sizeof(struct tmp421_data), GFP_KERNEL); if (!data) @@ -380,11 +402,18 @@ static int tmp421_probe(struct i2c_client *client) if (err) return err; - for (i = 0; i < data->channels; i++) - data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT; - tmp421_probe_from_dt(client, data); + for (i = 0; i < data->channels; i++) { + data->temp_config[i] |= HWMON_T_INPUT | HWMON_T_FAULT; + if (data->channel[i].disabled) + disable |= TMP421_CONFIG_REG_REN(i); + + } + + if (disable) + tmp421_disable_channels(client, disable); + data->chip.ops = &tmp421_ops; data->chip.info = data->info; -- 2.31.1