Testing has revealed that the temperature in the rtp controller of the A10
(sun4i) SoC has a resolution of 50 milli degrees / step, where as the
A13 (sun5i) and later models have 100 milli degrees / step.
Add a new sun5i-a13-ts compatible to differentiate the newer models and
set the resolution based on the compatible string.
This fixes the temperature reported on the A10 being twice as high as expected.
Reported-by: Tong Zhang <lovewilliam@xxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
Documentation/devicetree/bindings/input/touchscreen/sun4i.txt | 2 +-
drivers/input/touchscreen/sun4i-ts.c | 8 +++++++-
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
index aef5779..5106709 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
@@ -2,7 +2,7 @@ sun4i resistive touchscreen controller
--------------------------------------
Required properties:
- - compatible: "allwinner,sun4i-a10-ts"
+ - compatible: "allwinner,sun4i-a10-ts" or "allwinner,sun5i-a13-ts"
- reg: mmio address range of the chip
- interrupts: interrupt to which the chip is connected
diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c
index 2ba8260..5661be0 100644
--- a/drivers/input/touchscreen/sun4i-ts.c
+++ b/drivers/input/touchscreen/sun4i-ts.c
@@ -111,6 +111,7 @@ struct sun4i_ts_data {
unsigned int irq;
bool ignore_fifo_data;
int temp_data;
+ int temp_step;
};
static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val)
@@ -189,7 +190,7 @@ static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
if (ts->temp_data == -1)
return -EAGAIN;
- return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100);
+ return sprintf(buf, "%d\n", (ts->temp_data - 1447) * ts->temp_step);
}
static ssize_t show_temp_label(struct device *dev,
@@ -224,6 +225,10 @@ static int sun4i_ts_probe(struct platform_device *pdev)
ts->dev = dev;
ts->ignore_fifo_data = true;
ts->temp_data = -1;
+ if (of_device_is_compatible(np, "allwinner,sun4i-a10-ts"))
+ ts->temp_step = 50;
+ else
+ ts->temp_step = 100;
ts_attached = of_property_read_bool(np, "allwinner,ts-attached");
if (ts_attached) {
@@ -318,6 +323,7 @@ static int sun4i_ts_remove(struct platform_device *pdev)
static const struct of_device_id sun4i_ts_of_match[] = {
{ .compatible = "allwinner,sun4i-a10-ts", },
+ { .compatible = "allwinner,sun5i-a13-ts", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sun4i_ts_of_match);
--
2.0.0
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