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

touchpad controller.

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 4594788..f2aee89 100644 (file)
--- 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 (file)
index 0000000..d7852fc
--- /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;
+}