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@@ -86,6 +86,7 @@ superio_exit(void)
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#define SUPERIO_REG_ACT 0x30
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#define SUPERIO_REG_BASE 0x60
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#define SUPERIO_REG_DEVID 0x20
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+#define SUPERIO_REG_DEVREV 0x21
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/* Logical device registers */
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@@ -429,6 +430,9 @@ static int __init smsc47m1_find(unsigned short *addr,
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* The LPC47M292 (device id 0x6B) is somewhat compatible, but it
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* supports a 3rd fan, and the pin configuration registers are
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* unfortunately different.
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+ * The LPC47M233 has the same device id (0x6B) but is not compatible.
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+ * We check the high bit of the device revision register to
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+ * differentiate them.
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*/
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switch (val) {
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case 0x51:
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@@ -448,6 +452,13 @@ static int __init smsc47m1_find(unsigned short *addr,
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sio_data->type = smsc47m1;
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break;
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case 0x6B:
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+ if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
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+ pr_debug(DRVNAME ": "
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+ "Found SMSC LPC47M233, unsupported\n");
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+ superio_exit();
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+ return -ENODEV;
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+ }
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+
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pr_info(DRVNAME ": Found SMSC LPC47M292\n");
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sio_data->type = smsc47m2;
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break;
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