hwmon: add max1111_read_channel() for use by sharpsl_pm

This is not generic, and is added here for backward compatibility.
It is made an individual commit here to make it easier for revert
once the sharpsl_pm gets generic enough.

Signed-off-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/sharpsl_pm.c

@@ -132,8 +132,17 @@ int sharpsl_pm_pxa_read_max1111(int channel)
 	if (machine_is_tosa()) // Ugly, better move this function into another module
 	    return 0;
 
+#ifdef CONFIG_SENSORS_MAX1111
+	extern int max1111_read_channel(int);
+
+	/* max1111 accepts channels from 0-3, however,
+	 * it is encoded from 0-7 here in the code.
+	 */
+	return max1111_read_channel(channel >> 1);
+#else
 	return corgi_ssp_max1111_get((channel << MAXCTRL_SEL_SH) | MAXCTRL_PD0 | MAXCTRL_PD1
 			| MAXCTRL_SGL | MAXCTRL_UNI | MAXCTRL_STR);
+#endif
 }
 
 void sharpsl_pm_pxa_init(void)