The touchscreen controller has a temperature sensor embedded in the SoC, which already has hwmon support in the driver.
Add DT thermal zone support so we can use it with cpufreq for thermal throttling. Signed-off-by: Chen-Yu Tsai <[email protected]> --- .../bindings/input/touchscreen/sun4i.txt | 1 + drivers/input/touchscreen/sun4i-ts.c | 27 ++++++++++++++++++++++ 2 files changed, 28 insertions(+) diff --git a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt index aef57791f40b..7f1110adbd24 100644 --- a/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt +++ b/Documentation/devicetree/bindings/input/touchscreen/sun4i.txt @@ -5,6 +5,7 @@ Required properties: - compatible: "allwinner,sun4i-a10-ts" - reg: mmio address range of the chip - interrupts: interrupt to which the chip is connected + - #thermal-sensor-cells: shall be 0 Optional properties: - allwinner,ts-attached: boolean indicating that an actual touchscreen is diff --git a/drivers/input/touchscreen/sun4i-ts.c b/drivers/input/touchscreen/sun4i-ts.c index 28a06749ae42..b6e9043446d6 100644 --- a/drivers/input/touchscreen/sun4i-ts.c +++ b/drivers/input/touchscreen/sun4i-ts.c @@ -34,6 +34,7 @@ #include <linux/err.h> #include <linux/hwmon.h> +#include <linux/thermal.h> #include <linux/init.h> #include <linux/input.h> #include <linux/interrupt.h> @@ -107,6 +108,7 @@ struct sun4i_ts_data { struct device *dev; struct input_dev *input; + struct thermal_zone_device *tz; void __iomem *base; unsigned int irq; bool ignore_fifo_data; @@ -180,6 +182,23 @@ static void sun4i_ts_close(struct input_dev *dev) writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); } +static int get_temp(void *data, long *temp) +{ + struct sun4i_ts_data *ts = data; + + /* No temp_data until the first irq */ + if (ts->temp_data == -1) + return -EAGAIN; + + *temp = (ts->temp_data - 1447) * 100; + + return 0; +} + +static struct thermal_zone_of_device_ops sun4i_ts_tz_ops = { + .get_temp = get_temp, +}; + static ssize_t show_temp(struct device *dev, struct device_attribute *devattr, char *buf) { @@ -288,6 +307,11 @@ static int sun4i_ts_probe(struct platform_device *pdev) if (IS_ERR(hwmon)) return PTR_ERR(hwmon); + ts->tz = thermal_zone_of_sensor_register(ts->dev, 0, ts, + &sun4i_ts_tz_ops); + if (IS_ERR(ts->tz)) + ts->tz = NULL; + writel(TEMP_IRQ_EN(1), ts->base + TP_INT_FIFOC); if (ts_attached) { @@ -310,6 +334,9 @@ static int sun4i_ts_remove(struct platform_device *pdev) if (ts->input) input_unregister_device(ts->input); + if (ts->tz) + thermal_zone_of_sensor_unregister(ts->dev, ts->tz); + /* Deactivate all IRQs */ writel(0, ts->base + TP_INT_FIFOC); -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
