diff options
Diffstat (limited to 'hw/input/ads7846.c')
| -rw-r--r-- | hw/input/ads7846.c | 186 |
1 files changed, 0 insertions, 186 deletions
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) |