On Mon, May 12, 2014 at 04:44:51PM +0800, Chen-Yu Tsai wrote:

Hi,

On Sun, May 11, 2014 at 4:06 PM, Hans de Goede [off-list ref] wrote:

quoted

@@ -232,14 +284,39 @@ static int sun4i_ts_probe(struct platform_device *pdev)
        writel(STYLUS_UP_DEBOUN(5) | STYLUS_UP_DEBOUN_EN(1) | TP_MODE_EN(1),
               ts->base + TP_CTRL1);

-       ret = input_register_device(ts->input);
-       if (ret)
-               return ret;
+       hwmon = devm_hwmon_device_register_with_groups(ts->dev, "sun4i_ts",
+                                                      ts, sun4i_ts_groups);

This fails to compile when HWMON is not selected:

drivers/built-in.o: In function `sun4i_ts_probe':
/home/wens/cubieboard/linux/drivers/input/touchscreen/sun4i-ts.c:287:
undefined reference to `devm_hwmon_device_register_with_groups'

Best do a wrapper around the hwmon related code.
drivers/input/touchscreen/ads7846.c has something similar, albeit for voltage.

I added dependency on HWMON and applied, thank you.

-- 
Dmitry