Add a TI TSC2102 chip (touchscreen/ADC/audio-CODEC controller).

Fix GPIO memory mapping address and register width.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3484 c046a42c-6fe2-441c-8c8c-71466251a162

4 files changed, 868 insertions, 6 deletions

diff --git a/hw/omap.c b/hw/omap.c
index cfb7d2b..d6978d8 100644
--- a/hw/omap.c
+++ b/hw/omap.c
@@ -3184,16 +3184,17 @@ static void omap_gpio_write(void *opaque, target_phys_addr_t addr,
     }
 }
 
+/* *Some* sources say the memory region is 32-bit.  */
 static CPUReadMemoryFunc *omap_gpio_readfn[] = {
+    omap_badwidth_read16,
     omap_gpio_read,
-    omap_badwidth_read32,
-    omap_badwidth_read32,
+    omap_badwidth_read16,
 };
 
 static CPUWriteMemoryFunc *omap_gpio_writefn[] = {
+    omap_badwidth_write16,
     omap_gpio_write,
-    omap_badwidth_write32,
-    omap_badwidth_write32,
+    omap_badwidth_write16,
 };
 
 void omap_gpio_reset(struct omap_gpio_s *s)
@@ -3551,7 +3552,7 @@ struct omap_mpu_state_s *omap310_mpu_init(unsigned long sdram_size,
                     s->irq[1][OMAP_INT_KEYBOARD], s->irq[1][OMAP_INT_MPUIO],
                     s->wakeup, omap_findclk(s, "clk32-kHz"));
 
-    s->gpio = omap_gpio_init(0xfffcf000, s->irq[0][OMAP_INT_GPIO_BANK1],
+    s->gpio = omap_gpio_init(0xfffce000, s->irq[0][OMAP_INT_GPIO_BANK1],
                     omap_findclk(s, "mpuper_ck"));
 
     s->microwire = omap_uwire_init(0xfffb3000, &s->irq[1][OMAP_INT_uWireTX],
diff --git a/hw/palm.c b/hw/palm.c
index 7945745..0966413 100644
--- a/hw/palm.c
+++ b/hw/palm.c
@@ -76,8 +76,21 @@ static CPUWriteMemoryFunc *static_writefn[] = {
 #define PALMTE_MMC2_GPIO	7
 #define PALMTE_MMC3_GPIO	11
 
+static void palmte_pintdav(void *opaque, int line, int level)
+{
+    struct omap_mpu_state_s *cpu = (struct omap_mpu_state_s *) opaque;
+
+    qemu_set_irq(omap_gpio_in_get(cpu->gpio)[PALMTE_PINTDAV_GPIO],
+                    !level);
+}
+
 static void palmte_microwire_setup(struct omap_mpu_state_s *cpu)
 {
+    omap_uwire_attach(
+                    cpu->microwire,
+                    tsc2102_init(
+                            qemu_allocate_irqs(palmte_pintdav, cpu, 1)[0]),
+                    0);
 }
 
 static struct {
diff --git a/hw/pxa.h b/hw/pxa.h
index 90ffd60..037aebe 100644
--- a/hw/pxa.h
+++ b/hw/pxa.h
@@ -4,7 +4,7 @@
  * Copyright (c) 2006 Openedhand Ltd.
  * Written by Andrzej Zaborowski <balrog@zabor.org>
  *
- * This code is licenced under the GPL.
+ * This code is licenced under the GNU GPL v2.
  */
 #ifndef PXA_H
 # define PXA_H			"pxa.h"
diff --git a/hw/tsc210x.c b/hw/tsc210x.c
new file mode 100644
index 0000000..6aa2bc8
--- /dev/null
+++ b/hw/tsc210x.c
@@ -0,0 +1,848 @@
+/*
+ * TI TSC2102 (touchscreen/sensors/audio controller) controller.
+ *
+ * Copyright (c) 2006 Andrzej Zaborowski  <balrog@zabor.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include "vl.h"
+
+#define TSC_DATA_REGISTERS_PAGE		0x0
+#define TSC_CONTROL_REGISTERS_PAGE	0x1
+#define TSC_AUDIO_REGISTERS_PAGE	0x2
+
+#define TSC_VERBOSE
+
+#define TSC_CUT_RESOLUTION(value, p)	((value) >> (16 - resolution[p]))
+
+struct tsc210x_state_s {
+    qemu_irq pint;
+    QEMUTimer *timer;
+    struct uwire_slave_s chip;
+
+    int x, y;
+    int pressure;
+
+    int state, page, offset, irq;
+    uint16_t command, dav;
+
+    int busy;
+    int enabled;
+    int host_mode;
+    int function;
+    int nextfunction;
+    int precision;
+    int nextprecision;
+    int filter;
+    int pin_func;
+    int ref;
+    int timing;
+    int noise;
+
+    uint16_t audio_ctrl1;
+    uint16_t audio_ctrl2;
+    uint16_t audio_ctrl3;
+    uint16_t pll[2];
+    uint16_t volume;
+    int64_t volume_change;
+    int softstep;
+    uint16_t dac_power;
+    int64_t powerdown;
+    uint16_t filter_data[0x14];
+};
+
+static const int resolution[4] = { 12, 8, 10, 12 };
+
+#define TSC_MODE_NO_SCAN	0x0
+#define TSC_MODE_XY_SCAN	0x1
+#define TSC_MODE_XYZ_SCAN	0x2
+#define TSC_MODE_X		0x3
+#define TSC_MODE_Y		0x4
+#define TSC_MODE_Z		0x5
+#define TSC_MODE_BAT1		0x6
+#define TSC_MODE_BAT2		0x7
+#define TSC_MODE_AUX		0x8
+#define TSC_MODE_AUX_SCAN	0x9
+#define TSC_MODE_TEMP1		0xa
+#define TSC_MODE_PORT_SCAN	0xb
+#define TSC_MODE_TEMP2		0xc
+#define TSC_MODE_XX_DRV		0xd
+#define TSC_MODE_YY_DRV		0xe
+#define TSC_MODE_YX_DRV		0xf
+
+static const uint16_t mode_regs[16] = {
+    0x0000,	/* No scan */
+    0x0600,	/* X, Y scan */
+    0x0780,	/* X, Y, Z scan */
+    0x0400,	/* X */
+    0x0200,	/* Y */
+    0x0180,	/* Z */
+    0x0040,	/* BAT1 */
+    0x0030,	/* BAT2 */
+    0x0010,	/* AUX */
+    0x0010,	/* AUX scan */
+    0x0004,	/* TEMP1 */
+    0x0070,	/* Port scan */
+    0x0002,	/* TEMP2 */
+    0x0000,	/* X+, X- drivers */
+    0x0000,	/* Y+, Y- drivers */
+    0x0000,	/* Y+, X- drivers */
+};
+
+/*
+ * Convert screen coordinates to arbitrary values that the
+ * touchscreen in my Palm Tungsten E device returns.
+ * This shouldn't really matter (because the guest system
+ * should calibrate the touchscreen anyway), but let's
+ * imitate some real hardware.
+ */
+#define X_TRANSFORM(value)		\
+    ((3850 - ((int) (value) * (3850 - 250) / 32768)) << 4)
+#define Y_TRANSFORM(value)		\
+    ((150 + ((int) (value) * (3037 - 150) / 32768)) << 4)
+#define Z1_TRANSFORM(s)			\
+    ((400 - (s)->x + ((s)->pressure << 9)) << 4)
+#define Z2_TRANSFORM(s)			\
+    ((4000 + (s)->y - ((s)->pressure << 10)) << 4)
+#define BAT1_VAL			0x8660
+#define BAT2_VAL			0x0000
+#define AUX1_VAL			0x35c0
+#define AUX2_VAL			0xffff
+#define TEMP1_VAL			0x8c70
+#define TEMP2_VAL			0xa5b0
+
+#define TSC_POWEROFF_DELAY		50
+#define TSC_SOFTSTEP_DELAY		50
+
+static void tsc210x_reset(struct tsc210x_state_s *s)
+{
+    s->state = 0;
+    s->pin_func = 2;
+    s->enabled = 0;
+    s->busy = 0;
+    s->nextfunction = 0;
+    s->ref = 0;
+    s->timing = 0;
+    s->irq = 0;
+    s->dav = 0;
+
+    s->audio_ctrl1 = 0x0000;
+    s->audio_ctrl2 = 0x4410;
+    s->audio_ctrl3 = 0x0000;
+    s->pll[0] = 0x1004;
+    s->pll[1] = 0x0000;
+    s->volume = 0xffff;
+    s->dac_power = 0x8540;
+    s->softstep = 1;
+    s->volume_change = 0;
+    s->powerdown = 0;
+    s->filter_data[0x00] = 0x6be3;
+    s->filter_data[0x01] = 0x9666;
+    s->filter_data[0x02] = 0x675d;
+    s->filter_data[0x03] = 0x6be3;
+    s->filter_data[0x04] = 0x9666;
+    s->filter_data[0x05] = 0x675d;
+    s->filter_data[0x06] = 0x7d83;
+    s->filter_data[0x07] = 0x84ee;
+    s->filter_data[0x08] = 0x7d83;
+    s->filter_data[0x09] = 0x84ee;
+    s->filter_data[0x0a] = 0x6be3;
+    s->filter_data[0x0b] = 0x9666;
+    s->filter_data[0x0c] = 0x675d;
+    s->filter_data[0x0d] = 0x6be3;
+    s->filter_data[0x0e] = 0x9666;
+    s->filter_data[0x0f] = 0x675d;
+    s->filter_data[0x10] = 0x7d83;
+    s->filter_data[0x11] = 0x84ee;
+    s->filter_data[0x12] = 0x7d83;
+    s->filter_data[0x13] = 0x84ee;
+
+    qemu_set_irq(s->pint, s->irq);
+}
+
+static uint16_t tsc2102_data_register_read(struct tsc210x_state_s *s, int reg)
+{
+    switch (reg) {
+    case 0x00:	/* X */
+        s->dav &= 0xfbff;
+        return TSC_CUT_RESOLUTION(X_TRANSFORM(s->x), s->precision) +
+                (s->noise & 3);
+
+    case 0x01:	/* Y */
+        s->noise ++;
+        s->dav &= 0xfdff;
+        return TSC_CUT_RESOLUTION(Y_TRANSFORM(s->y), s->precision) ^
+                (s->noise & 3);
+
+    case 0x02:	/* Z1 */
+        s->dav &= 0xfeff;
+        return TSC_CUT_RESOLUTION(Z1_TRANSFORM(s), s->precision) -
+                (s->noise & 3);
+
+    case 0x03:	/* Z2 */
+        s->dav &= 0xff7f;
+        return TSC_CUT_RESOLUTION(Z2_TRANSFORM(s), s->precision) |
+                (s->noise & 3);
+
+    case 0x04:	/* KPData */
+        return 0xffff;
+
+    case 0x05:	/* BAT1 */
+        s->dav &= 0xffbf;
+        return TSC_CUT_RESOLUTION(BAT1_VAL, s->precision);
+
+    case 0x06:	/* BAT2 */
+        s->dav &= 0xffdf;
+        return TSC_CUT_RESOLUTION(BAT2_VAL, s->precision);
+
+    case 0x07:	/* AUX1 */
+        s->dav &= 0xffef;
+        return TSC_CUT_RESOLUTION(AUX1_VAL, s->precision);
+
+    case 0x08:	/* AUX2 */
+        s->dav &= 0xfff7;
+        return 0xffff;
+
+    case 0x09:	/* TEMP1 */
+        s->dav &= 0xfffb;
+        return TSC_CUT_RESOLUTION(TEMP1_VAL, s->precision);
+
+    case 0x0a:	/* TEMP2 */
+        s->dav &= 0xfffd;
+        return TSC_CUT_RESOLUTION(TEMP2_VAL, s->precision);
+
+    case 0x0b:	/* DAC */
+        s->dav &= 0xfffe;
+        return 0xffff;
+
+    default:
+#ifdef TSC_VERBOSE
+        fprintf(stderr, "tsc2102_data_register_read: "
+                        "no such register: 0x%02x\n", reg);
+#endif
+        return 0xffff;
+    }
+}
+
+static uint16_t tsc2102_control_register_read(
+                struct tsc210x_state_s *s, int reg)
+{
+    switch (reg) {
+    case 0x00:	/* TSC ADC */
+        return (s->pressure << 15) | ((!s->busy) << 14) |
+                (s->nextfunction << 10) | (s->nextprecision << 8) | s->filter; 
+
+    case 0x01:	/* Status */
+        return (s->pin_func << 14) | ((!s->enabled) << 13) |
+                (s->host_mode << 12) | ((!!s->dav) << 11) | s->dav;
+
+    case 0x03:	/* Reference */
+        return s->ref;
+
+    case 0x04:	/* Reset */
+        return 0xffff;
+
+    case 0x05:	/* Configuration */
+        return s->timing;
+
+    default:
+#ifdef TSC_VERBOSE
+        fprintf(stderr, "tsc2102_control_register_read: "
+                        "no such register: 0x%02x\n", reg);
+#endif
+        return 0xffff;
+    }
+}
+
+static uint16_t tsc2102_audio_register_read(struct tsc210x_state_s *s, int reg)
+{
+    int l_ch, r_ch;
+    uint16_t val;
+
+    switch (reg) {
+    case 0x00:	/* Audio Control 1 */
+        return s->audio_ctrl1;
+
+    case 0x01:
+        return 0xff00;
+
+    case 0x02:	/* DAC Volume Control */
+        return s->volume;
+
+    case 0x03:
+        return 0x8b00;
+
+    case 0x04:	/* Audio Control 2 */
+        l_ch = 1;
+        r_ch = 1;
+        if (s->softstep && !(s->dac_power & (1 << 10))) {
+            l_ch = (qemu_get_clock(vm_clock) >
+                            s->volume_change + TSC_SOFTSTEP_DELAY);
+            r_ch = (qemu_get_clock(vm_clock) >
+                            s->volume_change + TSC_SOFTSTEP_DELAY);
+        }
+
+        return s->audio_ctrl2 | (l_ch << 3) | (r_ch << 2);
+
+    case 0x05:	/* Stereo DAC Power Control */
+        return 0x2aa0 | s->dac_power |
+                (((s->dac_power & (1 << 10)) &&
+                  (qemu_get_clock(vm_clock) >
+                   s->powerdown + TSC_POWEROFF_DELAY)) << 6);
+
+    case 0x06:	/* Audio Control 3 */
+        val = s->audio_ctrl3 | 0x0001;
+        s->audio_ctrl3 &= 0xff3f;
+        return val;
+
+    case 0x07:	/* LCH_BASS_BOOST_N0 */
+    case 0x08:	/* LCH_BASS_BOOST_N1 */
+    case 0x09:	/* LCH_BASS_BOOST_N2 */
+    case 0x0a:	/* LCH_BASS_BOOST_N3 */
+    case 0x0b:	/* LCH_BASS_BOOST_N4 */
+    case 0x0c:	/* LCH_BASS_BOOST_N5 */
+    case 0x0d:	/* LCH_BASS_BOOST_D1 */
+    case 0x0e:	/* LCH_BASS_BOOST_D2 */
+    case 0x0f:	/* LCH_BASS_BOOST_D4 */
+    case 0x10:	/* LCH_BASS_BOOST_D5 */
+    case 0x11:	/* RCH_BASS_BOOST_N0 */
+    case 0x12:	/* RCH_BASS_BOOST_N1 */
+    case 0x13:	/* RCH_BASS_BOOST_N2 */
+    case 0x14:	/* RCH_BASS_BOOST_N3 */
+    case 0x15:	/* RCH_BASS_BOOST_N4 */
+    case 0x16:	/* RCH_BASS_BOOST_N5 */
+    case 0x17:	/* RCH_BASS_BOOST_D1 */
+    case 0x18:	/* RCH_BASS_BOOST_D2 */
+    case 0x19:	/* RCH_BASS_BOOST_D4 */
+    case 0x1a:	/* RCH_BASS_BOOST_D5 */
+        return s->filter_data[reg - 0x07];
+
+    case 0x1b:	/* PLL Programmability 1 */
+        return s->pll[0];
+
+    case 0x1c:	/* PLL Programmability 2 */
+        return s->pll[1];
+
+    case 0x1d:	/* Audio Control 4 */
+        return (!s->softstep) << 14;
+
+    default:
+#ifdef TSC_VERBOSE
+        fprintf(stderr, "tsc2102_audio_register_read: "
+                        "no such register: 0x%02x\n", reg);
+#endif
+        return 0xffff;
+    }
+}
+
+static void tsc2102_data_register_write(
+                struct tsc210x_state_s *s, int reg, uint16_t value)
+{
+    switch (reg) {
+    case 0x00:	/* X */
+    case 0x01:	/* Y */
+    case 0x02:	/* Z1 */
+    case 0x03:	/* Z2 */
+    case 0x05:	/* BAT1 */
+    case 0x06:	/* BAT2 */
+    case 0x07:	/* AUX1 */
+    case 0x08:	/* AUX2 */
+    case 0x09:	/* TEMP1 */
+    case 0x0a:	/* TEMP2 */
+        return;
+
+    default:
+#ifdef TSC_VERBOSE
+        fprintf(stderr, "tsc2102_data_register_write: "
+                        "no such register: 0x%02x\n", reg);
+#endif
+    }
+}
+
+static void tsc2102_control_register_write(
+                struct tsc210x_state_s *s, int reg, uint16_t value)
+{
+    switch (reg) {
+    case 0x00:	/* TSC ADC */
+        s->host_mode = value >> 15;
+        s->enabled = !(value & 0x4000);
+        if (s->busy && !s->enabled)
+            qemu_del_timer(s->timer);
+        s->busy &= s->enabled;
+        s->nextfunction = (value >> 10) & 0xf;
+        s->nextprecision = (value >> 8) & 3;
+        s->filter = value & 0xff;
+        return;
+
+    case 0x01:	/* Status */
+        s->pin_func = value >> 14;
+        return;
+
+    case 0x03:	/* Reference */
+        s->ref = value & 0x1f;
+        return;
+
+    case 0x04:	/* Reset */
+        if (value == 0xbb00) {
+            if (s->busy)
+                qemu_del_timer(s->timer);
+            tsc210x_reset(s);
+#ifdef TSC_VERBOSE
+        } else {
+            fprintf(stderr, "tsc2102_control_register_write: "
+                            "wrong value written into RESET\n");
+#endif
+        }
+        return;
+
+    case 0x05:	/* Configuration */
+        s->timing = value & 0x3f;
+#ifdef TSC_VERBOSE
+        if (value & ~0x3f)
+            fprintf(stderr, "tsc2102_control_register_write: "
+                            "wrong value written into CONFIG\n");
+#endif
+        return;
+
+    default:
+#ifdef TSC_VERBOSE
+        fprintf(stderr, "tsc2102_control_register_write: "
+                        "no such register: 0x%02x\n", reg);
+#endif
+    }
+}
+
+static void tsc2102_audio_register_write(
+                struct tsc210x_state_s *s, int reg, uint16_t value)
+{
+    switch (reg) {
+    case 0x00:	/* Audio Control 1 */
+        s->audio_ctrl1 = value & 0x0f3f;
+#ifdef TSC_VERBOSE
+        if ((value & ~0x0f3f) || ((value & 7) != ((value >> 3) & 7)))
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into Audio 1\n");
+#endif
+        return;
+
+    case 0x01:
+#ifdef TSC_VERBOSE
+        if (value != 0xff00)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into reg 0x01\n");
+#endif
+        return;
+
+    case 0x02:	/* DAC Volume Control */
+        s->volume = value;
+        s->volume_change = qemu_get_clock(vm_clock);
+        return;
+
+    case 0x03:
+#ifdef TSC_VERBOSE
+        if (value != 0x8b00)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into reg 0x03\n");
+#endif
+        return;
+
+    case 0x04:	/* Audio Control 2 */
+        s->audio_ctrl2 = value & 0xf7f2;
+#ifdef TSC_VERBOSE
+        if (value & ~0xf7fd)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into Audio 2\n");
+#endif
+        return;
+
+    case 0x05:	/* Stereo DAC Power Control */
+        if ((value & ~s->dac_power) & (1 << 10))
+            s->powerdown = qemu_get_clock(vm_clock);
+
+        s->dac_power = value & 0x9543;
+#ifdef TSC_VERBOSE
+        if ((value & ~0x9543) != 0x2aa0)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into Power\n");
+#endif
+        return;
+
+    case 0x06:	/* Audio Control 3 */
+        s->audio_ctrl3 &= 0x00c0;
+        s->audio_ctrl3 |= value & 0xf800;
+#ifdef TSC_VERBOSE
+        if (value & ~0xf8c7)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into Audio 3\n");
+#endif
+        return;
+
+    case 0x07:	/* LCH_BASS_BOOST_N0 */
+    case 0x08:	/* LCH_BASS_BOOST_N1 */
+    case 0x09:	/* LCH_BASS_BOOST_N2 */
+    case 0x0a:	/* LCH_BASS_BOOST_N3 */
+    case 0x0b:	/* LCH_BASS_BOOST_N4 */
+    case 0x0c:	/* LCH_BASS_BOOST_N5 */
+    case 0x0d:	/* LCH_BASS_BOOST_D1 */
+    case 0x0e:	/* LCH_BASS_BOOST_D2 */
+    case 0x0f:	/* LCH_BASS_BOOST_D4 */
+    case 0x10:	/* LCH_BASS_BOOST_D5 */
+    case 0x11:	/* RCH_BASS_BOOST_N0 */
+    case 0x12:	/* RCH_BASS_BOOST_N1 */
+    case 0x13:	/* RCH_BASS_BOOST_N2 */
+    case 0x14:	/* RCH_BASS_BOOST_N3 */
+    case 0x15:	/* RCH_BASS_BOOST_N4 */
+    case 0x16:	/* RCH_BASS_BOOST_N5 */
+    case 0x17:	/* RCH_BASS_BOOST_D1 */
+    case 0x18:	/* RCH_BASS_BOOST_D2 */
+    case 0x19:	/* RCH_BASS_BOOST_D4 */
+    case 0x1a:	/* RCH_BASS_BOOST_D5 */
+        s->filter_data[reg - 0x07] = value;
+        return;
+
+    case 0x1b:	/* PLL Programmability 1 */
+        s->pll[0] = value & 0xfffc;
+#ifdef TSC_VERBOSE
+        if (value & ~0xfffc)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into PLL 1\n");
+#endif
+        return;
+
+    case 0x1c:	/* PLL Programmability 2 */
+        s->pll[1] = value & 0xfffc;
+#ifdef TSC_VERBOSE
+        if (value & ~0xfffc)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into PLL 2\n");
+#endif
+        return;
+
+    case 0x1d:	/* Audio Control 4 */
+        s->softstep = !(value & 0x4000);
+#ifdef TSC_VERBOSE
+        if (value & ~0x4000)
+            fprintf(stderr, "tsc2102_audio_register_write: "
+                            "wrong value written into Audio 4\n");
+#endif
+        return;
+
+    default:
+#ifdef TSC_VERBOSE
+        fprintf(stderr, "tsc2102_audio_register_write: "
+                        "no such register: 0x%02x\n", reg);
+#endif
+    }
+}
+
+/* This handles most of the chip logic.  */
+static void tsc210x_pin_update(struct tsc210x_state_s *s)
+{
+    int64_t expires;
+    int pin_state;
+
+    switch (s->pin_func) {
+    case 0:
+        pin_state = s->pressure;
+        break;
+    case 1:
+        pin_state = !!s->dav;
+        break;
+    case 2:
+    default:
+        pin_state = s->pressure && !s->dav;
+    }
+
+    if (!s->enabled)
+        pin_state = 0;
+
+    if (pin_state != s->irq) {
+        s->irq = pin_state;
+        qemu_set_irq(s->pint, s->irq);
+    }
+
+    switch (s->nextfunction) {
+    case TSC_MODE_XY_SCAN:
+    case TSC_MODE_XYZ_SCAN:
+        if (!s->pressure)
+            return;
+        break;
+
+    case TSC_MODE_X:
+    case TSC_MODE_Y:
+    case TSC_MODE_Z:
+        if (!s->pressure)
+            return;
+        /* Fall through */
+    case TSC_MODE_BAT1:
+    case TSC_MODE_BAT2:
+    case TSC_MODE_AUX:
+    case TSC_MODE_TEMP1:
+    case TSC_MODE_TEMP2:
+        if (s->dav)
+            s->enabled = 0;
+        break;
+
+    case TSC_MODE_AUX_SCAN:
+    case TSC_MODE_PORT_SCAN:
+        break;
+
+    case TSC_MODE_NO_SCAN:
+    case TSC_MODE_XX_DRV:
+    case TSC_MODE_YY_DRV:
+    case TSC_MODE_YX_DRV:
+    default:
+        return;
+    }
+
+    if (!s->enabled || s->busy)
+        return;
+
+    s->busy = 1;
+    s->precision = s->nextprecision;
+    s->function = s->nextfunction;
+    expires = qemu_get_clock(vm_clock) + (ticks_per_sec >> 10);
+    qemu_mod_timer(s->timer, expires);
+}
+
+static uint16_t tsc210x_read(struct tsc210x_state_s *s)
+{
+    uint16_t ret = 0x0000;
+
+    if (!s->command)
+        fprintf(stderr, "tsc210x_read: SPI underrun!\n");
+
+    switch (s->page) {
+    case TSC_DATA_REGISTERS_PAGE:
+        ret = tsc2102_data_register_read(s, s->offset);
+        break;
+    case TSC_CONTROL_REGISTERS_PAGE:
+        ret = tsc2102_control_register_read(s, s->offset);
+        break;
+    case TSC_AUDIO_REGISTERS_PAGE:
+        ret = tsc2102_audio_register_read(s, s->offset);
+        break;
+    default:
+        cpu_abort(cpu_single_env, "tsc210x_read: wrong memory page\n");
+    }
+
+    tsc210x_pin_update(s);
+
+    /* Allow sequential reads.  */
+    s->offset ++;
+    s->state = 0;
+    return ret;
+}
+
+static void tsc210x_write(struct tsc210x_state_s *s, uint16_t value)
+{
+    /*
+     * This is a two-state state machine for reading
+     * command and data every second time.
+     */
+    if (!s->state) {
+        s->command = value >> 15;
+        s->page = (value >> 11) & 0x0f;
+        s->offset = (value >> 5) & 0x3f;
+        s->state = 1;
+    } else {
+        if (s->command)
+            fprintf(stderr, "tsc210x_write: SPI overrun!\n");
+        else
+            switch (s->page) {
+            case TSC_DATA_REGISTERS_PAGE:
+                tsc2102_data_register_write(s, s->offset, value);
+                break;
+            case TSC_CONTROL_REGISTERS_PAGE:
+                tsc2102_control_register_write(s, s->offset, value);
+                break;
+            case TSC_AUDIO_REGISTERS_PAGE:
+                tsc2102_audio_register_write(s, s->offset, value);
+                break;
+            default:
+                cpu_abort(cpu_single_env,
+                                "tsc210x_write: wrong memory page\n");
+            }
+
+        tsc210x_pin_update(s);
+        s->state = 0;
+    }
+}
+
+static void tsc210x_timer_tick(void *opaque)
+{
+    struct tsc210x_state_s *s = opaque;
+
+    /* Timer ticked -- a set of conversions has been finished.  */
+
+    if (!s->busy)
+        return;
+
+    s->busy = 0;
+    s->dav |= mode_regs[s->function];
+    tsc210x_pin_update(s);
+}
+
+static void tsc210x_touchscreen_event(void *opaque,
+                int x, int y, int z, int buttons_state)
+{
+    struct tsc210x_state_s *s = opaque;
+    int p = s->pressure;
+
+    if (buttons_state) {
+        s->x = x;
+        s->y = y;
+    }
+    s->pressure = !!buttons_state;
+
+    /*
+     * Note: We would get better responsiveness in the guest by
+     * signaling TS events immediately, but for now we simulate
+     * the first conversion delay for sake of correctness.
+     */
+    if (p != s->pressure)
+        tsc210x_pin_update(s);
+}
+
+static void tsc210x_save(QEMUFile *f, void *opaque)
+{
+    struct tsc210x_state_s *s = (struct tsc210x_state_s *) opaque;
+    int64_t now = qemu_get_clock(vm_clock);
+    int i;
+
+    qemu_put_be16(f, s->x);
+    qemu_put_be16(f, s->y);
+    qemu_put_byte(f, s->pressure);
+
+    qemu_put_byte(f, s->state);
+    qemu_put_byte(f, s->page);
+    qemu_put_byte(f, s->offset);
+    qemu_put_byte(f, s->command);
+
+    qemu_put_byte(f, s->irq);
+    qemu_put_be16s(f, &s->dav);
+
+    qemu_put_timer(f, s->timer);
+    qemu_put_byte(f, s->enabled);
+    qemu_put_byte(f, s->host_mode);
+    qemu_put_byte(f, s->function);
+    qemu_put_byte(f, s->nextfunction);
+    qemu_put_byte(f, s->precision);
+    qemu_put_byte(f, s->nextprecision);
+    qemu_put_byte(f, s->filter);
+    qemu_put_byte(f, s->pin_func);
+    qemu_put_byte(f, s->ref);
+    qemu_put_byte(f, s->timing);
+    qemu_put_be32(f, s->noise);
+
+    qemu_put_be16s(f, &s->audio_ctrl1);
+    qemu_put_be16s(f, &s->audio_ctrl2);
+    qemu_put_be16s(f, &s->audio_ctrl3);
+    qemu_put_be16s(f, &s->pll[0]);
+    qemu_put_be16s(f, &s->pll[1]);
+    qemu_put_be16s(f, &s->volume);
+    qemu_put_be64(f, (uint64_t) (s->volume_change - now));
+    qemu_put_be64(f, (uint64_t) (s->powerdown - now));
+    qemu_put_byte(f, s->softstep);
+    qemu_put_be16s(f, &s->dac_power);
+
+    for (i = 0; i < 0x14; i ++)
+        qemu_put_be16s(f, &s->filter_data[i]);
+}
+
+static int tsc210x_load(QEMUFile *f, void *opaque, int version_id)
+{
+    struct tsc210x_state_s *s = (struct tsc210x_state_s *) opaque;
+    int64_t now = qemu_get_clock(vm_clock);
+    int i;
+
+    s->x = qemu_get_be16(f);
+    s->y = qemu_get_be16(f);
+    s->pressure = qemu_get_byte(f);
+
+    s->state = qemu_get_byte(f);
+    s->page = qemu_get_byte(f);
+    s->offset = qemu_get_byte(f);
+    s->command = qemu_get_byte(f);
+
+    s->irq = qemu_get_byte(f);
+    qemu_get_be16s(f, &s->dav);
+
+    qemu_get_timer(f, s->timer);
+    s->enabled = qemu_get_byte(f);
+    s->host_mode = qemu_get_byte(f);
+    s->function = qemu_get_byte(f);
+    s->nextfunction = qemu_get_byte(f);
+    s->precision = qemu_get_byte(f);
+    s->nextprecision = qemu_get_byte(f);
+    s->filter = qemu_get_byte(f);
+    s->pin_func = qemu_get_byte(f);
+    s->ref = qemu_get_byte(f);
+    s->timing = qemu_get_byte(f);
+    s->noise = qemu_get_be32(f);
+
+    qemu_get_be16s(f, &s->audio_ctrl1);
+    qemu_get_be16s(f, &s->audio_ctrl2);
+    qemu_get_be16s(f, &s->audio_ctrl3);
+    qemu_get_be16s(f, &s->pll[0]);
+    qemu_get_be16s(f, &s->pll[1]);
+    qemu_get_be16s(f, &s->volume);
+    s->volume_change = (int64_t) qemu_get_be64(f) + now;
+    s->powerdown = (int64_t) qemu_get_be64(f) + now;
+    s->softstep = qemu_get_byte(f);
+    qemu_get_be16s(f, &s->dac_power);
+
+    for (i = 0; i < 0x14; i ++)
+        qemu_get_be16s(f, &s->filter_data[i]);
+
+    s->busy = qemu_timer_pending(s->timer);
+    qemu_set_irq(s->pint, s->irq);
+
+    return 0;
+}
+
+static int tsc2102_iid = 0;
+
+struct uwire_slave_s *tsc2102_init(qemu_irq pint)
+{
+    struct tsc210x_state_s *s;
+
+    s = (struct tsc210x_state_s *)
+            qemu_mallocz(sizeof(struct tsc210x_state_s));
+    memset(s, 0, sizeof(struct tsc210x_state_s));
+    s->x = 160;
+    s->y = 160;
+    s->pressure = 0;
+    s->precision = s->nextprecision = 0;
+    s->timer = qemu_new_timer(vm_clock, tsc210x_timer_tick, s);
+    s->pint = pint;
+
+    s->chip.opaque = s;
+    s->chip.send = (void *) tsc210x_write;
+    s->chip.receive = (void *) tsc210x_read;
+
+    tsc210x_reset(s);
+
+    qemu_add_mouse_event_handler(tsc210x_touchscreen_event, s, 1,
+                    "QEMU TSC2102-driven Touchscreen");
+
+    qemu_register_reset((void *) tsc210x_reset, s);
+    register_savevm("tsc2102", tsc2102_iid ++, 0,
+                    tsc210x_save, tsc210x_load, s);
+
+    return &s->chip;
+}