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>

2 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm/mach-pxa/sharpsl_pm.c b/arch/arm/mach-pxa/sharpsl_pm.c
index e804ae09370c..9427d8088395 100644
--- a/arch/arm/mach-pxa/sharpsl_pm.c
+++ b/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)
diff --git a/drivers/hwmon/max1111.c b/drivers/hwmon/max1111.c
index 12c05774a1c3..bfaa665ccf32 100644
--- a/drivers/hwmon/max1111.c
+++ b/drivers/hwmon/max1111.c
@@ -66,6 +66,16 @@ static int max1111_read(struct device *dev, int channel)
         return (v1 << 2) | (v2 >> 6);
 }
 
+#ifdef CONFIG_SHARPSL_PM
+static struct max1111_data *the_max1111;
+
+int max1111_read_channel(int channel)
+{
+        return max1111_read(&the_max1111->spi->dev, channel);
+}
+EXPORT_SYMBOL(max1111_read_channel);
+#endif
+
 /*
  * NOTE: SPI devices do not have a default 'name' attribute, which is
  * likely to be used by hwmon applications to distinguish between
@@ -181,6 +191,9 @@ static int __devinit max1111_probe(struct spi_device *spi)
                 goto err_remove;
         }
 
+#ifdef CONFIG_SHARPSL_PM
+        the_max1111 = data;
+#endif
         return 0;
 
 err_remove: