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From 2e2493cd07405dfa88e53199b47bdbbb5336fdce Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Mon, 16 Jun 2014 20:01:12 +0200
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Subject: [PATCH] touchscreen: sun4i-ts: A10 (sun4i) has a different
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temperature curve
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Testing has revealed that the temperature in the rtp controller of the A10
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(sun4i) SoC has a different curve then on the A13 (sun5i) and later models.
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Add a new sun5i-a13-ts compatible to differentiate the newer models and
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set the curve based on the compatible string.
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This fixes the temperature reported on the A10 being much higher then
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expected.
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Note the new curve is still not ideal on all A10-s, that seems to have to
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do with there being a large spread between different A10-s out there.
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Reported-by: Tong Zhang <lovewilliam@gmail.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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.../devicetree/bindings/input/touchscreen/sun4i.txt | 2 +-
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drivers/input/touchscreen/sun4i-ts.c | 13 ++++++++++++-
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2 files changed, 13 insertions(+), 2 deletions(-)
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--- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
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+++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt
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@@ -2,7 +2,7 @@ sun4i resistive touchscreen controller
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--------------------------------------
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Required properties:
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- - compatible: "allwinner,sun4i-a10-ts"
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+ - compatible: "allwinner,sun4i-a10-ts" or "allwinner,sun5i-a13-ts"
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- reg: mmio address range of the chip
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- interrupts: interrupt to which the chip is connected
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--- a/drivers/input/touchscreen/sun4i-ts.c
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+++ b/drivers/input/touchscreen/sun4i-ts.c
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@@ -111,6 +111,8 @@ struct sun4i_ts_data {
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unsigned int irq;
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bool ignore_fifo_data;
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int temp_data;
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+ int temp_offset;
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+ int temp_step;
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};
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static void sun4i_ts_irq_handle_input(struct sun4i_ts_data *ts, u32 reg_val)
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@@ -189,7 +191,8 @@ static ssize_t show_temp(struct device *
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if (ts->temp_data == -1)
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return -EAGAIN;
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- return sprintf(buf, "%d\n", (ts->temp_data - 1447) * 100);
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+ return sprintf(buf, "%d\n",
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+ (ts->temp_data - ts->temp_offset) * ts->temp_step);
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}
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static ssize_t show_temp_label(struct device *dev,
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@@ -224,6 +227,13 @@ static int sun4i_ts_probe(struct platfor
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ts->dev = dev;
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ts->ignore_fifo_data = true;
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ts->temp_data = -1;
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+ if (of_device_is_compatible(np, "allwinner,sun4i-a10-ts")) {
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+ ts->temp_offset = 1900;
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+ ts->temp_step = 100;
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+ } else {
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+ ts->temp_offset = 1447;
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+ ts->temp_step = 100;
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+ }
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ts_attached = of_property_read_bool(np, "allwinner,ts-attached");
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if (ts_attached) {
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@@ -318,6 +328,7 @@ static int sun4i_ts_remove(struct platfo
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static const struct of_device_id sun4i_ts_of_match[] = {
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{ .compatible = "allwinner,sun4i-a10-ts", },
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+ { .compatible = "allwinner,sun5i-a13-ts", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, sun4i_ts_of_match);
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