Add sxits(4), a driver for the temperature sensor on the Allwinner A10/A20

touchpad controller.

2 files changed, 149 insertions, 1 deletions

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 45947881fdd..f2aee8937b1 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.35 2018/01/02 22:33:17 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.36 2018/01/06 13:04:47 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -32,6 +32,10 @@ device	sxitemp
 attach	sxitemp at fdt
 file	dev/fdt/sxitemp.c		sxitemp
 
+device	sxits
+attach	sxits at fdt
+file	dev/fdt/sxits.c			sxits
+
 device	sxitwi: i2cbus
 attach	sxitwi at fdt
 file	dev/fdt/sxitwi.c		sxitwi
diff --git a/sys/dev/fdt/sxits.c b/sys/dev/fdt/sxits.c
new file mode 100644
index 00000000000..d7852fc1f28
--- /dev/null
+++ b/sys/dev/fdt/sxits.c
@@ -0,0 +1,144 @@
+/*	$OpenBSD: sxits.c,v 1.1 2018/01/06 13:04:47 kettenis Exp $	*/
+/*
+ * Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/sensors.h>
+
+#include <machine/intr.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/fdt.h>
+
+/* Registers */
+#define TP_CTRL0			0x00
+#define  TP_CTRL0_ADC_CLK_DIVIDER(x)	(((x) & 0x3) << 20)
+#define  TP_CTRL0_FS_DIV(x)		(((x) & 0xf) << 16)
+#define  TP_CTRL0_TACQ(x)		((x) & 0xffff)
+#define TP_CTRL1			0x04
+#define  TP_CTRL1_TP_MODE_EN		(1 << 4)
+#define TP_CTRL3			0x0c
+#define  TP_CTRL3_FILTER_EN		(1 << 2)
+#define  TP_CTRL3_FILTER_TYPE(x)	((x) & 0x3)
+#define TP_TPR				0x18
+#define  TP_TPR_TEMP_EN			(1 << 16)
+#define  TP_TPR_TEMP_PER(x)		((x) & 0xffff)
+#define TEMP_DATA			0x20
+
+#define HREAD4(sc, reg)							\
+	(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HWRITE4(sc, reg, val)						\
+	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+
+struct sxits_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+
+	uint16_t		sc_offset;
+	uint16_t		sc_scale;
+
+	struct ksensor		sc_sensor;
+	struct ksensordev	sc_sensordev;
+};
+
+int	sxits_match(struct device *, void *, void *);
+void	sxits_attach(struct device *, struct device *, void *);
+
+struct cfattach	sxits_ca = {
+	sizeof (struct sxits_softc), sxits_match, sxits_attach
+};
+
+struct cfdriver sxits_cd = {
+	NULL, "sxits", DV_DULL
+};
+
+void	sxits_refresh_sensors(void *);
+
+int
+sxits_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	return (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-ts") ||
+	    OF_is_compatible(faa->fa_node, "allwinner,sun5i-a13-ts"));
+}
+
+void
+sxits_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct sxits_softc *sc = (struct sxits_softc *)self;
+	struct fdt_attach_args *faa = aux;
+
+	if (faa->fa_nreg < 1) {
+		printf(": no registers\n");
+		return;
+	}
+
+	sc->sc_iot = faa->fa_iot;
+	if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
+	    faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
+		printf(": can't map registers\n");
+		return;
+	}
+
+	printf("\n");
+
+	if (OF_is_compatible(faa->fa_node, "allwinner,sun4i-a10-ts")) {
+		sc->sc_offset = 1932;
+		sc->sc_scale = 133;
+	} else {
+		sc->sc_offset = 1447;
+		sc->sc_scale = 100;
+	}
+
+	/* Start data acquisition. */
+	HWRITE4(sc, TP_CTRL0, TP_CTRL0_ADC_CLK_DIVIDER(2) |
+	    TP_CTRL0_FS_DIV(7) | TP_CTRL0_TACQ(63));
+	HWRITE4(sc, TP_CTRL1, TP_CTRL1_TP_MODE_EN);
+	HWRITE4(sc, TP_CTRL3, TP_CTRL3_FILTER_EN | TP_CTRL3_FILTER_TYPE(1));
+	HWRITE4(sc, TP_TPR, TP_TPR_TEMP_EN | TP_TPR_TEMP_PER(800));
+
+	/* Register sensors. */
+	strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
+	    sizeof(sc->sc_sensordev.xname));
+	sc->sc_sensor.type = SENSOR_TEMP;
+	sc->sc_sensor.flags = SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
+	sensordev_install(&sc->sc_sensordev);
+	sensor_task_register(sc, sxits_refresh_sensors, 5);
+}
+
+void
+sxits_refresh_sensors(void *arg)
+{
+	struct sxits_softc *sc = arg;
+	uint32_t data, temp;
+
+	data = HREAD4(sc, TEMP_DATA);
+	if (data == 0) {
+		sc->sc_sensor.flags |= SENSOR_FINVALID;
+		return;
+	}
+
+	temp = (data - sc->sc_offset) * sc->sc_scale;
+	sc->sc_sensor.value = temp * 1000 + 273150000;
+	sc->sc_sensor.flags &= ~SENSOR_FINVALID;
+}