21     Acer Labs Inc. (ALI) M1535 South Bridge.
23     The M1535 is a South bridge for portable systems.
24     It is very similar to the M15x3 South bridges also produced
31     by comparing this driver to the i2c-ali15x3 driver.
35     ACPI-compliant Power Management Unit (PMU).
96 #define	ALI1535_DEV10B_EN	0x80	/* Enable 10-bit addressing in	*/
98 #define	ALI1535_T_OUT		0x08	/* Time-out Command (write)	*/
99 #define	ALI1535_A_HIGH_BIT9	0x08	/* Bit 9 of 10-bit address in	*/
100 					/* Alert-Response-Address	*/
103 #define	ALI1535_A_HIGH_BIT8	0x04	/* Bit 8 of 10-bit address in	*/
104 					/*  Alert-Response-Address	*/
107 #define	ALI1535_D_HI_MASK	0x03	/* Mask for isolating bits 9-8	*/
108 					/*  of 10-bit address in I2C	*/
124 					/*  Address field		*/
125 					/*  -> Write = 0		*/
126 					/*  -> Read  = 1		*/
143 		- SMB I/O address is initialized  in ali1535_setup()
144 		- Device is enabled  in ali1535_setup()
145 		- We can use the addresses  in ali1535_setup()
150 		dev_err(&dev->dev, "ALI1535_smb can't enable device\n");  in ali1535_setup()
156 	dev_dbg(&dev->dev, "ALI1535_smb is at offset 0x%04x\n", ali1535_offset);  in ali1535_setup()
157 	ali1535_offset &= (0xffff & ~(ALI1535_SMB_IOSIZE - 1));  in ali1535_setup()
159 		dev_warn(&dev->dev,  in ali1535_setup()
160 			"ALI1535_smb region uninitialized - upgrade BIOS?\n");  in ali1535_setup()
161 		retval = -ENODEV;  in ali1535_setup()
177 		dev_err(&dev->dev, "ALI1535_smb region 0x%lx already in use!\n",  in ali1535_setup()
179 		retval = -EBUSY;  in ali1535_setup()
186 		dev_err(&dev->dev, "SMB device not enabled - upgrade BIOS?\n");  in ali1535_setup()
187 		retval = -ENODEV;  in ali1535_setup()
194 		dev_err(&dev->dev, "SMBus controller not enabled - upgrade BIOS?\n");  in ali1535_setup()
195 		retval = -ENODEV;  in ali1535_setup()
207 		dev_dbg(&dev->dev, "ALI1535 using Interrupt 9 for SMBus.\n");  in ali1535_setup()
210 	dev_dbg(&dev->dev, "SMBREV = 0x%X\n", temp);  in ali1535_setup()
211 	dev_dbg(&dev->dev, "ALI1535_smba = 0x%lx\n", ali1535_smba);  in ali1535_setup()
227 	dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, TYP=%02x, "  in ali1535_transaction()
252 		/* Try resetting entire SMB bus, including other devices - This  in ali1535_transaction()
253 		 * may not work either - it clears the BUSY bit but then the  in ali1535_transaction()
257 		dev_info(&adap->dev,  in ali1535_transaction()
266 		/* do a clear-on-write */  in ali1535_transaction()
274 			dev_err(&adap->dev,  in ali1535_transaction()
275 				"SMBus reset failed! (0x%02x) - controller or "  in ali1535_transaction()
277 			return -EBUSY;  in ali1535_transaction()
298 		result = -ETIMEDOUT;  in ali1535_transaction()
299 		dev_err(&adap->dev, "SMBus Timeout!\n");  in ali1535_transaction()
303 		result = -EIO;  in ali1535_transaction()
304 		dev_dbg(&adap->dev, "Error: Failed bus transaction\n");  in ali1535_transaction()
312 		result = -ENXIO;  in ali1535_transaction()
313 		dev_dbg(&adap->dev,  in ali1535_transaction()
320 		result = -EIO;  in ali1535_transaction()
321 		dev_err(&adap->dev, "Error: device error\n");  in ali1535_transaction()
326 		result = -ETIMEDOUT;  in ali1535_transaction()
327 		dev_err(&adap->dev, "Error: command never completed\n");  in ali1535_transaction()
330 	dev_dbg(&adap->dev, "Transaction (post): STS=%02x, TYP=%02x, "  in ali1535_transaction()
368 		dev_warn(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp);  in ali1535_access()
370 	/* clear status register (clear-on-write) */  in ali1535_access()
395 			outb_p(data->byte, SMBHSTDAT0);  in ali1535_access()
404 			outb_p(data->word & 0xff, SMBHSTDAT0);  in ali1535_access()
405 			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);  in ali1535_access()
415 			len = data->block[0];  in ali1535_access()
418 				data->block[0] = len;  in ali1535_access()
422 				data->block[0] = len;  in ali1535_access()
428 				outb_p(data->block[i], SMBBLKDAT);  in ali1535_access()
432 		dev_warn(&adap->dev, "Unsupported transaction %d\n", size);  in ali1535_access()
433 		result = -EOPNOTSUPP;  in ali1535_access()
448 		data->byte = inb_p(SMBHSTDAT0);  in ali1535_access()
451 		data->byte = inb_p(SMBHSTDAT0);  in ali1535_access()
454 		data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);  in ali1535_access()
460 		data->block[0] = len;  in ali1535_access()
463 		for (i = 1; i <= data->block[0]; i++) {  in ali1535_access()
464 			data->block[i] = inb_p(SMBBLKDAT);  in ali1535_access()
465 			dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n",  in ali1535_access()
466 				len, i, data->block[i]);  in ali1535_access()
503 		dev_warn(&dev->dev,  in ali1535_probe()
505 		return -ENODEV;  in ali1535_probe()
509 	ali1535_adapter.dev.parent = &dev->dev;  in ali1535_probe()