Commit 591bfcfc authored by Guenter Roeck's avatar Guenter Roeck
Browse files

hwmon: (adm1021) Strengthen chip detection for ADM1021, LM84 and MAX1617 



On a system with both MAX1617 and JC42 sensors, JC42 sensors can be misdetected
as LM84. Strengthen detection sufficiently enough to avoid this misdetection.
Also improve detection for ADM1021.

Modeled after chip detection code in sensors-detect command.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Tested-by: default avatarJean Delvare <khali@linux-fr.org>
Acked-by: default avatarJean Delvare <khali@linux-fr.org>
parent d683b96b

drivers/hwmon/adm1021.c

+50 −8
Original line number Diff line number Diff line
@@ -331,26 +331,68 @@ static int adm1021_detect(struct i2c_client *client, 
	man_id = i2c_smbus_read_byte_data(client, ADM1021_REG_MAN_ID);

	dev_id = i2c_smbus_read_byte_data(client, ADM1021_REG_DEV_ID);



	if (man_id < 0 || dev_id < 0)

		return -ENODEV;



	if (man_id == 0x4d && dev_id == 0x01)

		type_name = "max1617a";

	else if (man_id == 0x41) {

		if ((dev_id & 0xF0) == 0x30)

			type_name = "adm1023";

		else

		else if ((dev_id & 0xF0) == 0x00)

			type_name = "adm1021";

		else

			return -ENODEV;

	} else if (man_id == 0x49)

		type_name = "thmc10";

	else if (man_id == 0x23)

		type_name = "gl523sm";

	else if (man_id == 0x54)

		type_name = "mc1066";

	/* LM84 Mfr ID in a different place, and it has more unused bits */

	else if (conv_rate == 0x00

	else {

		int lte, rte, lhi, rhi, llo, rlo;



		/* extra checks for LM84 and MAX1617 to avoid misdetections */



		llo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(0));

		rlo = i2c_smbus_read_byte_data(client, ADM1021_REG_THYST_R(1));



		/* fail if any of the additional register reads failed */

		if (llo < 0 || rlo < 0)

			return -ENODEV;



		lte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(0));

		rte = i2c_smbus_read_byte_data(client, ADM1021_REG_TEMP(1));

		lhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(0));

		rhi = i2c_smbus_read_byte_data(client, ADM1021_REG_TOS_R(1));



		/*

		 * Fail for negative temperatures and negative high limits.

		 * This check also catches read errors on the tested registers.

		 */

		if ((s8)lte < 0 || (s8)rte < 0 || (s8)lhi < 0 || (s8)rhi < 0)

			return -ENODEV;



		/* fail if all registers hold the same value */

		if (lte == rte && lte == lhi && lte == rhi && lte == llo

		    && lte == rlo)

			return -ENODEV;



		/*

		 * LM84 Mfr ID is in a different place,

		 * and it has more unused bits.

		 */

		if (conv_rate == 0x00

		    && (config & 0x7F) == 0x00

		 && (status & 0xAB) == 0x00)

		    && (status & 0xAB) == 0x00) {

			type_name = "lm84";

	else

		} else {

			/* fail if low limits are larger than high limits */

			if ((s8)llo > lhi || (s8)rlo > rhi)

				return -ENODEV;

			type_name = "max1617";

		}

	}



	pr_debug("Detected chip %s at adapter %d, address 0x%02x.\n",

		 type_name, i2c_adapter_id(adapter), client->addr);

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