hw/input: Drop ADS7846 device

The ADS7846 touchscreen controller device was used only by
the XScale-based PDA machine types. Now that they have been
removed, this device is not used in the tree and can be
deleted.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20240903160751.4100218-3-peter.maydell@linaro.org

3 files changed, 0 insertions, 190 deletions

diff --git a/hw/input/Kconfig b/hw/input/Kconfig
index f86e98c829..acfdba5c4c 100644
--- a/hw/input/Kconfig
+++ b/hw/input/Kconfig
@@ -1,9 +1,6 @@
 config ADB
     bool
 
-config ADS7846
-    bool
-
 config LM832X
     bool
     depends on I2C
diff --git a/hw/input/ads7846.c b/hw/input/ads7846.c
deleted file mode 100644
index cde3892216..0000000000
--- a/hw/input/ads7846.c
+++ /dev/null
@@ -1,186 +0,0 @@
-/*
- * TI ADS7846 / TSC2046 chip emulation.
- *
- * Copyright (c) 2006 Openedhand Ltd.
- * Written by Andrzej Zaborowski <balrog@zabor.org>
- *
- * This code is licensed under the GNU GPL v2.
- *
- * Contributions after 2012-01-13 are licensed under the terms of the
- * GNU GPL, version 2 or (at your option) any later version.
- */
-
-#include "qemu/osdep.h"
-#include "hw/irq.h"
-#include "hw/ssi/ssi.h"
-#include "migration/vmstate.h"
-#include "qemu/module.h"
-#include "ui/console.h"
-#include "qom/object.h"
-
-struct ADS7846State {
-    SSIPeripheral ssidev;
-    qemu_irq interrupt;
-
-    int input[8];
-    int pressure;
-    int noise;
-
-    int cycle;
-    int output;
-};
-
-#define TYPE_ADS7846 "ads7846"
-OBJECT_DECLARE_SIMPLE_TYPE(ADS7846State, ADS7846)
-
-/* Control-byte bitfields */
-#define CB_PD0          (1 << 0)
-#define CB_PD1          (1 << 1)
-#define CB_SER          (1 << 2)
-#define CB_MODE         (1 << 3)
-#define CB_A0           (1 << 4)
-#define CB_A1           (1 << 5)
-#define CB_A2           (1 << 6)
-#define CB_START        (1 << 7)
-
-#define X_AXIS_DMAX     3470
-#define X_AXIS_MIN      290
-#define Y_AXIS_DMAX     3450
-#define Y_AXIS_MIN      200
-
-#define ADS_VBAT        2000
-#define ADS_VAUX        2000
-#define ADS_TEMP0       2000
-#define ADS_TEMP1       3000
-#define ADS_XPOS(x, y)  (X_AXIS_MIN + ((X_AXIS_DMAX * (x)) >> 15))
-#define ADS_YPOS(x, y)  (Y_AXIS_MIN + ((Y_AXIS_DMAX * (y)) >> 15))
-#define ADS_Z1POS(x, y) 600
-#define ADS_Z2POS(x, y) (600 + 6000 / ADS_XPOS(x, y))
-
-static void ads7846_int_update(ADS7846State *s)
-{
-    if (s->interrupt)
-        qemu_set_irq(s->interrupt, s->pressure == 0);
-}
-
-static uint32_t ads7846_transfer(SSIPeripheral *dev, uint32_t value)
-{
-    ADS7846State *s = ADS7846(dev);
-
-    switch (s->cycle ++) {
-    case 0:
-        if (!(value & CB_START)) {
-            s->cycle = 0;
-            break;
-        }
-
-        s->output = s->input[(value >> 4) & 7];
-
-        /* Imitate the ADC noise, some drivers expect this.  */
-        s->noise = (s->noise + 3) & 7;
-        switch ((value >> 4) & 7) {
-        case 1: s->output += s->noise ^ 2; break;
-        case 3: s->output += s->noise ^ 0; break;
-        case 4: s->output += s->noise ^ 7; break;
-        case 5: s->output += s->noise ^ 5; break;
-        }
-
-        if (value & CB_MODE)
-            s->output >>= 4;    /* 8 bits instead of 12 */
-
-        break;
-    case 1:
-        s->cycle = 0;
-        break;
-    }
-    return s->output;
-}
-
-static void ads7846_ts_event(void *opaque,
-                int x, int y, int z, int buttons_state)
-{
-    ADS7846State *s = opaque;
-
-    if (buttons_state) {
-        x = 0x7fff - x;
-        s->input[1] = ADS_XPOS(x, y);
-        s->input[3] = ADS_Z1POS(x, y);
-        s->input[4] = ADS_Z2POS(x, y);
-        s->input[5] = ADS_YPOS(x, y);
-    }
-
-    if (s->pressure == !buttons_state) {
-        s->pressure = !!buttons_state;
-
-        ads7846_int_update(s);
-    }
-}
-
-static int ads7856_post_load(void *opaque, int version_id)
-{
-    ADS7846State *s = opaque;
-
-    s->pressure = 0;
-    ads7846_int_update(s);
-    return 0;
-}
-
-static const VMStateDescription vmstate_ads7846 = {
-    .name = "ads7846",
-    .version_id = 1,
-    .minimum_version_id = 1,
-    .post_load = ads7856_post_load,
-    .fields = (const VMStateField[]) {
-        VMSTATE_SSI_PERIPHERAL(ssidev, ADS7846State),
-        VMSTATE_INT32_ARRAY(input, ADS7846State, 8),
-        VMSTATE_INT32(noise, ADS7846State),
-        VMSTATE_INT32(cycle, ADS7846State),
-        VMSTATE_INT32(output, ADS7846State),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static void ads7846_realize(SSIPeripheral *d, Error **errp)
-{
-    DeviceState *dev = DEVICE(d);
-    ADS7846State *s = ADS7846(d);
-
-    qdev_init_gpio_out(dev, &s->interrupt, 1);
-
-    s->input[0] = ADS_TEMP0;    /* TEMP0 */
-    s->input[2] = ADS_VBAT;     /* VBAT */
-    s->input[6] = ADS_VAUX;     /* VAUX */
-    s->input[7] = ADS_TEMP1;    /* TEMP1 */
-
-    /* We want absolute coordinates */
-    qemu_add_mouse_event_handler(ads7846_ts_event, s, 1,
-                    "QEMU ADS7846-driven Touchscreen");
-
-    ads7846_int_update(s);
-
-    vmstate_register_any(NULL, &vmstate_ads7846, s);
-}
-
-static void ads7846_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    SSIPeripheralClass *k = SSI_PERIPHERAL_CLASS(klass);
-
-    k->realize = ads7846_realize;
-    k->transfer = ads7846_transfer;
-    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
-}
-
-static const TypeInfo ads7846_info = {
-    .name          = TYPE_ADS7846,
-    .parent        = TYPE_SSI_PERIPHERAL,
-    .instance_size = sizeof(ADS7846State),
-    .class_init    = ads7846_class_init,
-};
-
-static void ads7846_register_types(void)
-{
-    type_register_static(&ads7846_info);
-}
-
-type_init(ads7846_register_types)
diff --git a/hw/input/meson.build b/hw/input/meson.build
index 3cc8ab85f0..07a28c2c01 100644
--- a/hw/input/meson.build
+++ b/hw/input/meson.build
@@ -1,6 +1,5 @@
 system_ss.add(files('hid.c'))
 system_ss.add(when: 'CONFIG_ADB', if_true: files('adb.c', 'adb-mouse.c', 'adb-kbd.c'))
-system_ss.add(when: 'CONFIG_ADS7846', if_true: files('ads7846.c'))
 system_ss.add(when: 'CONFIG_LM832X', if_true: files('lm832x.c'))
 system_ss.add(when: 'CONFIG_PCKBD', if_true: files('pckbd.c'))
 system_ss.add(when: 'CONFIG_PL050', if_true: files('pl050.c'))