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Commit 3f8b8459 authored by Jean Delvare's avatar Jean Delvare
Browse files

hwmon: (w83791d) Clean up detect function 



As kind is now hard-coded to -1, there is room for code clean-ups.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Acked-by: default avatarMarc Hulsman <m.hulsman@tudelft.nl>
parent bab2bf44

drivers/hwmon/w83791d.c

+18 −42
Original line number Diff line number Diff line
@@ -1270,56 +1270,32 @@ static int w83791d_detect(struct i2c_client *client, int kind, 
		return -ENODEV;

	}



	/* The w83791d may be stuck in some other bank than bank 0. This may

	   make reading other information impossible. Specify a force=...

	   parameter, and the Winbond will be reset to the right bank. */

	if (kind < 0) {

		if (w83791d_read(client, W83791D_REG_CONFIG) & 0x80) {

	if (w83791d_read(client, W83791D_REG_CONFIG) & 0x80)

		return -ENODEV;

		}



	val1 = w83791d_read(client, W83791D_REG_BANK);

	val2 = w83791d_read(client, W83791D_REG_CHIPMAN);

	/* Check for Winbond ID if in bank 0 */

	if (!(val1 & 0x07)) {

			/* yes it is Bank0 */

			if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||

			    ((val1 & 0x80) && (val2 != 0x5c))) {

		if ((!(val1 & 0x80) && val2 != 0xa3) ||

		    ( (val1 & 0x80) && val2 != 0x5c)) {

			return -ENODEV;

		}

	}

	/* If Winbond chip, address of chip and W83791D_REG_I2C_ADDR

	   should match */

		if (w83791d_read(client, W83791D_REG_I2C_ADDR) != address) {

	if (w83791d_read(client, W83791D_REG_I2C_ADDR) != address)

		return -ENODEV;

		}

	}



	/* We either have a force parameter or we have reason to

	   believe it is a Winbond chip. Either way, we want bank 0 and

	   Vendor ID high byte */

	/* We want bank 0 and Vendor ID high byte */

	val1 = w83791d_read(client, W83791D_REG_BANK) & 0x78;

	w83791d_write(client, W83791D_REG_BANK, val1 | 0x80);



	/* Verify it is a Winbond w83791d */

	if (kind <= 0) {

		/* get vendor ID */

		val2 = w83791d_read(client, W83791D_REG_CHIPMAN);

		if (val2 != 0x5c) {	/* the vendor is NOT Winbond */

			return -ENODEV;

		}

	val1 = w83791d_read(client, W83791D_REG_WCHIPID);

		if (val1 == 0x71) {

			kind = w83791d;

		} else {

			if (kind == 0)

				dev_warn(&adapter->dev,

					"w83791d: Ignoring 'force' parameter "

					"for unknown chip at adapter %d, "

					"address 0x%02x\n",

					i2c_adapter_id(adapter), address);

	val2 = w83791d_read(client, W83791D_REG_CHIPMAN);

	if (val1 != 0x71 || val2 != 0x5c)

		return -ENODEV;

		}

	}



	strlcpy(info->type, "w83791d", I2C_NAME_SIZE);