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qemu-e2k/hw/input/lm832x.c
Corey Minyard 2ac4c5f4d2 i2c: have I2C receive operation return uint8_t 
It is never supposed to fail and cannot return an error, so just
have it return the proper type.  Have it return 0xff on nothing
available, since that's what would happen on a real bus.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2019-02-27 21:06:08 -06:00

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/*
* National Semiconductor LM8322/8323 GPIO keyboard & PWM chips.
*
* Copyright (C) 2008 Nokia Corporation
* Written by Andrzej Zaborowski <andrew@openedhand.com>
*
* 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 or
* (at your option) version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "hw/hw.h"
#include "hw/i2c/i2c.h"
#include "qemu/timer.h"
#include "ui/console.h"
#define TYPE_LM8323 "lm8323"
#define LM8323(obj) OBJECT_CHECK(LM823KbdState, (obj), TYPE_LM8323)
typedef struct {
I2CSlave parent_obj;
uint8_t i2c_dir;
uint8_t i2c_cycle;
uint8_t reg;
qemu_irq nirq;
uint16_t model;
struct {
qemu_irq out[2];
int in[2][2];
} mux;
uint8_t config;
uint8_t status;
uint8_t acttime;
uint8_t error;
uint8_t clock;
struct {
uint16_t pull;
uint16_t mask;
uint16_t dir;
uint16_t level;
qemu_irq out[16];
} gpio;
struct {
uint8_t dbnctime;
uint8_t size;
uint8_t start;
uint8_t len;
uint8_t fifo[16];
} kbd;
struct {
uint16_t file[256];
uint8_t faddr;
uint8_t addr[3];
QEMUTimer *tm[3];
} pwm;
} LM823KbdState;
#define INT_KEYPAD (1 << 0)
#define INT_ERROR (1 << 3)
#define INT_NOINIT (1 << 4)
#define INT_PWMEND(n) (1 << (5 + n))
#define ERR_BADPAR (1 << 0)
#define ERR_CMDUNK (1 << 1)
#define ERR_KEYOVR (1 << 2)
#define ERR_FIFOOVR (1 << 6)
static void lm_kbd_irq_update(LM823KbdState *s)
{
qemu_set_irq(s->nirq, !s->status);
}
static void lm_kbd_gpio_update(LM823KbdState *s)
{
}
static void lm_kbd_reset(LM823KbdState *s)
{
s->config = 0x80;
s->status = INT_NOINIT;
s->acttime = 125;
s->kbd.dbnctime = 3;
s->kbd.size = 0x33;
s->clock = 0x08;
lm_kbd_irq_update(s);
lm_kbd_gpio_update(s);
}
static void lm_kbd_error(LM823KbdState *s, int err)
{
s->error |= err;
s->status |= INT_ERROR;
lm_kbd_irq_update(s);
}
static void lm_kbd_pwm_tick(LM823KbdState *s, int line)
{
}
static void lm_kbd_pwm_start(LM823KbdState *s, int line)
{
lm_kbd_pwm_tick(s, line);
}
static void lm_kbd_pwm0_tick(void *opaque)
{
lm_kbd_pwm_tick(opaque, 0);
}
static void lm_kbd_pwm1_tick(void *opaque)
{
lm_kbd_pwm_tick(opaque, 1);
}
static void lm_kbd_pwm2_tick(void *opaque)
{
lm_kbd_pwm_tick(opaque, 2);
}
enum {
LM832x_CMD_READ_ID = 0x80, /* Read chip ID. */
LM832x_CMD_WRITE_CFG = 0x81, /* Set configuration item. */
LM832x_CMD_READ_INT = 0x82, /* Get interrupt status. */
LM832x_CMD_RESET = 0x83, /* Reset, same as external one */
LM823x_CMD_WRITE_PULL_DOWN = 0x84, /* Select GPIO pull-up/down. */
LM832x_CMD_WRITE_PORT_SEL = 0x85, /* Select GPIO in/out. */
LM832x_CMD_WRITE_PORT_STATE = 0x86, /* Set GPIO pull-up/down. */
LM832x_CMD_READ_PORT_SEL = 0x87, /* Get GPIO in/out. */
LM832x_CMD_READ_PORT_STATE = 0x88, /* Get GPIO pull-up/down. */
LM832x_CMD_READ_FIFO = 0x89, /* Read byte from FIFO. */
LM832x_CMD_RPT_READ_FIFO = 0x8a, /* Read FIFO (no increment). */
LM832x_CMD_SET_ACTIVE = 0x8b, /* Set active time. */
LM832x_CMD_READ_ERROR = 0x8c, /* Get error status. */
LM832x_CMD_READ_ROTATOR = 0x8e, /* Read rotator status. */
LM832x_CMD_SET_DEBOUNCE = 0x8f, /* Set debouncing time. */
LM832x_CMD_SET_KEY_SIZE = 0x90, /* Set keypad size. */
LM832x_CMD_READ_KEY_SIZE = 0x91, /* Get keypad size. */
LM832x_CMD_READ_CFG = 0x92, /* Get configuration item. */
LM832x_CMD_WRITE_CLOCK = 0x93, /* Set clock config. */
LM832x_CMD_READ_CLOCK = 0x94, /* Get clock config. */
LM832x_CMD_PWM_WRITE = 0x95, /* Write PWM script. */
LM832x_CMD_PWM_START = 0x96, /* Start PWM engine. */
LM832x_CMD_PWM_STOP = 0x97, /* Stop PWM engine. */
LM832x_GENERAL_ERROR = 0xff, /* There was one error.
Previously was represented by -1
This is not a command */
};
#define LM832x_MAX_KPX 8
#define LM832x_MAX_KPY 12
static uint8_t lm_kbd_read(LM823KbdState *s, int reg, int byte)
{
int ret;
switch (reg) {
case LM832x_CMD_READ_ID:
ret = 0x0400;
break;
case LM832x_CMD_READ_INT:
ret = s->status;
if (!(s->status & INT_NOINIT)) {
s->status = 0;
lm_kbd_irq_update(s);
}
break;
case LM832x_CMD_READ_PORT_SEL:
ret = s->gpio.dir;
break;
case LM832x_CMD_READ_PORT_STATE:
ret = s->gpio.mask;
break;
case LM832x_CMD_READ_FIFO:
if (s->kbd.len <= 1)
return 0x00;
/* Example response from the two commands after a INT_KEYPAD
* interrupt caused by the key 0x3c being pressed:
* RPT_READ_FIFO: 55 bc 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
* READ_FIFO: bc 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
* RPT_READ_FIFO: bc 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9 01
*
* 55 is the code of the key release event serviced in the previous
* interrupt handling.
*
* TODO: find out whether the FIFO is advanced a single character
* before reading every byte or the whole size of the FIFO at the
* last LM832x_CMD_READ_FIFO. This affects LM832x_CMD_RPT_READ_FIFO
* output in cases where there are more than one event in the FIFO.
* Assume 0xbc and 0x3c events are in the FIFO:
* RPT_READ_FIFO: 55 bc 3c 00 4e ff 0a 50 08 00 29 d9 08 01 c9
* READ_FIFO: bc 3c 00 00 4e ff 0a 50 08 00 29 d9 08 01 c9
* Does RPT_READ_FIFO now return 0xbc and 0x3c or only 0x3c?
*/
s->kbd.start ++;
s->kbd.start &= sizeof(s->kbd.fifo) - 1;
s->kbd.len --;
return s->kbd.fifo[s->kbd.start];
case LM832x_CMD_RPT_READ_FIFO:
if (byte >= s->kbd.len)
return 0x00;
return s->kbd.fifo[(s->kbd.start + byte) & (sizeof(s->kbd.fifo) - 1)];
case LM832x_CMD_READ_ERROR:
return s->error;
case LM832x_CMD_READ_ROTATOR:
return 0;
case LM832x_CMD_READ_KEY_SIZE:
return s->kbd.size;
case LM832x_CMD_READ_CFG:
return s->config & 0xf;
case LM832x_CMD_READ_CLOCK:
return (s->clock & 0xfc) | 2;
default:
lm_kbd_error(s, ERR_CMDUNK);
fprintf(stderr, "%s: unknown command %02x\n", __func__, reg);
return 0x00;
}
return ret >> (byte << 3);
}
static void lm_kbd_write(LM823KbdState *s, int reg, int byte, uint8_t value)
{
switch (reg) {
case LM832x_CMD_WRITE_CFG:
s->config = value;
/* This must be done whenever s->mux.in is updated (never). */
if ((s->config >> 1) & 1) /* MUX1EN */
qemu_set_irq(s->mux.out[0], s->mux.in[0][(s->config >> 0) & 1]);
if ((s->config >> 3) & 1) /* MUX2EN */
qemu_set_irq(s->mux.out[0], s->mux.in[0][(s->config >> 2) & 1]);
/* TODO: check that this is issued only following the chip reset
* and not in the middle of operation and that it is followed by
* the GPIO ports re-resablishing through WRITE_PORT_SEL and
* WRITE_PORT_STATE (using a timer perhaps) and otherwise output
* warnings. */
s->status = 0;
lm_kbd_irq_update(s);
s->kbd.len = 0;
s->kbd.start = 0;
s->reg = LM832x_GENERAL_ERROR;
break;
case LM832x_CMD_RESET:
if (value == 0xaa)
lm_kbd_reset(s);
else
lm_kbd_error(s, ERR_BADPAR);
s->reg = LM832x_GENERAL_ERROR;
break;
case LM823x_CMD_WRITE_PULL_DOWN:
if (!byte)
s->gpio.pull = value;
else {
s->gpio.pull |= value << 8;
lm_kbd_gpio_update(s);
s->reg = LM832x_GENERAL_ERROR;
}
break;
case LM832x_CMD_WRITE_PORT_SEL:
if (!byte)
s->gpio.dir = value;
else {
s->gpio.dir |= value << 8;
lm_kbd_gpio_update(s);
s->reg = LM832x_GENERAL_ERROR;
}
break;
case LM832x_CMD_WRITE_PORT_STATE:
if (!byte)
s->gpio.mask = value;
else {
s->gpio.mask |= value << 8;
lm_kbd_gpio_update(s);
s->reg = LM832x_GENERAL_ERROR;
}
break;
case LM832x_CMD_SET_ACTIVE:
s->acttime = value;
s->reg = LM832x_GENERAL_ERROR;
break;
case LM832x_CMD_SET_DEBOUNCE:
s->kbd.dbnctime = value;
s->reg = LM832x_GENERAL_ERROR;
if (!value)
lm_kbd_error(s, ERR_BADPAR);
break;
case LM832x_CMD_SET_KEY_SIZE:
s->kbd.size = value;
s->reg = LM832x_GENERAL_ERROR;
if (
(value & 0xf) < 3 || (value & 0xf) > LM832x_MAX_KPY ||
(value >> 4) < 3 || (value >> 4) > LM832x_MAX_KPX)
lm_kbd_error(s, ERR_BADPAR);
break;
case LM832x_CMD_WRITE_CLOCK:
s->clock = value;
s->reg = LM832x_GENERAL_ERROR;
if ((value & 3) && (value & 3) != 3) {
lm_kbd_error(s, ERR_BADPAR);
fprintf(stderr, "%s: invalid clock setting in RCPWM\n",
__func__);
}
/* TODO: Validate that the command is only issued once */
break;
case LM832x_CMD_PWM_WRITE:
if (byte == 0) {
if (!(value & 3) || (value >> 2) > 59) {
lm_kbd_error(s, ERR_BADPAR);
s->reg = LM832x_GENERAL_ERROR;
break;
}
s->pwm.faddr = value;
s->pwm.file[s->pwm.faddr] = 0;
} else if (byte == 1) {
s->pwm.file[s->pwm.faddr] |= value << 8;
} else if (byte == 2) {
s->pwm.file[s->pwm.faddr] |= value << 0;
s->reg = LM832x_GENERAL_ERROR;
}
break;
case LM832x_CMD_PWM_START:
s->reg = LM832x_GENERAL_ERROR;
if (!(value & 3) || (value >> 2) > 59) {
lm_kbd_error(s, ERR_BADPAR);
break;
}
s->pwm.addr[(value & 3) - 1] = value >> 2;
lm_kbd_pwm_start(s, (value & 3) - 1);
break;
case LM832x_CMD_PWM_STOP:
s->reg = LM832x_GENERAL_ERROR;
if (!(value & 3)) {
lm_kbd_error(s, ERR_BADPAR);
break;
}
timer_del(s->pwm.tm[(value & 3) - 1]);
break;
case LM832x_GENERAL_ERROR:
lm_kbd_error(s, ERR_BADPAR);
break;
default:
lm_kbd_error(s, ERR_CMDUNK);
fprintf(stderr, "%s: unknown command %02x\n", __func__, reg);
break;
}
}
static int lm_i2c_event(I2CSlave *i2c, enum i2c_event event)
{
LM823KbdState *s = LM8323(i2c);
switch (event) {
case I2C_START_RECV:
case I2C_START_SEND:
s->i2c_cycle = 0;
s->i2c_dir = (event == I2C_START_SEND);
break;
default:
break;
}
return 0;
}
static uint8_t lm_i2c_rx(I2CSlave *i2c)
{
LM823KbdState *s = LM8323(i2c);
return lm_kbd_read(s, s->reg, s->i2c_cycle ++);
}
static int lm_i2c_tx(I2CSlave *i2c, uint8_t data)
{
LM823KbdState *s = LM8323(i2c);
if (!s->i2c_cycle)
s->reg = data;
else
lm_kbd_write(s, s->reg, s->i2c_cycle - 1, data);
s->i2c_cycle ++;
return 0;
}
static int lm_kbd_post_load(void *opaque, int version_id)
{
LM823KbdState *s = opaque;
lm_kbd_irq_update(s);
lm_kbd_gpio_update(s);
return 0;
}
static const VMStateDescription vmstate_lm_kbd = {
.name = "LM8323",
.version_id = 0,
.minimum_version_id = 0,
.post_load = lm_kbd_post_load,
.fields = (VMStateField[]) {
VMSTATE_I2C_SLAVE(parent_obj, LM823KbdState),
VMSTATE_UINT8(i2c_dir, LM823KbdState),
VMSTATE_UINT8(i2c_cycle, LM823KbdState),
VMSTATE_UINT8(reg, LM823KbdState),
VMSTATE_UINT8(config, LM823KbdState),
VMSTATE_UINT8(status, LM823KbdState),
VMSTATE_UINT8(acttime, LM823KbdState),
VMSTATE_UINT8(error, LM823KbdState),
VMSTATE_UINT8(clock, LM823KbdState),
VMSTATE_UINT16(gpio.pull, LM823KbdState),
VMSTATE_UINT16(gpio.mask, LM823KbdState),
VMSTATE_UINT16(gpio.dir, LM823KbdState),
VMSTATE_UINT16(gpio.level, LM823KbdState),
VMSTATE_UINT8(kbd.dbnctime, LM823KbdState),
VMSTATE_UINT8(kbd.size, LM823KbdState),
VMSTATE_UINT8(kbd.start, LM823KbdState),
VMSTATE_UINT8(kbd.len, LM823KbdState),
VMSTATE_BUFFER(kbd.fifo, LM823KbdState),
VMSTATE_UINT16_ARRAY(pwm.file, LM823KbdState, 256),
VMSTATE_UINT8(pwm.faddr, LM823KbdState),
VMSTATE_BUFFER(pwm.addr, LM823KbdState),
VMSTATE_TIMER_PTR_ARRAY(pwm.tm, LM823KbdState, 3),
VMSTATE_END_OF_LIST()
}
};
static void lm8323_realize(DeviceState *dev, Error **errp)
{
LM823KbdState *s = LM8323(dev);
s->model = 0x8323;
s->pwm.tm[0] = timer_new_ns(QEMU_CLOCK_VIRTUAL, lm_kbd_pwm0_tick, s);
s->pwm.tm[1] = timer_new_ns(QEMU_CLOCK_VIRTUAL, lm_kbd_pwm1_tick, s);
s->pwm.tm[2] = timer_new_ns(QEMU_CLOCK_VIRTUAL, lm_kbd_pwm2_tick, s);
qdev_init_gpio_out(dev, &s->nirq, 1);
lm_kbd_reset(s);
qemu_register_reset((void *) lm_kbd_reset, s);
}
void lm832x_key_event(DeviceState *dev, int key, int state)
{
LM823KbdState *s = LM8323(dev);
if ((s->status & INT_ERROR) && (s->error & ERR_FIFOOVR))
return;
if (s->kbd.len >= sizeof(s->kbd.fifo)) {
lm_kbd_error(s, ERR_FIFOOVR);
return;
}
s->kbd.fifo[(s->kbd.start + s->kbd.len ++) & (sizeof(s->kbd.fifo) - 1)] =
key | (state << 7);
/* We never set ERR_KEYOVR because we support multiple keys fine. */
s->status |= INT_KEYPAD;
lm_kbd_irq_update(s);
}
static void lm8323_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
dc->realize = lm8323_realize;
k->event = lm_i2c_event;
k->recv = lm_i2c_rx;
k->send = lm_i2c_tx;
dc->vmsd = &vmstate_lm_kbd;
}
static const TypeInfo lm8323_info = {
.name = TYPE_LM8323,
.parent = TYPE_I2C_SLAVE,
.instance_size = sizeof(LM823KbdState),
.class_init = lm8323_class_init,
};
static void lm832x_register_types(void)
{
type_register_static(&lm8323_info);
}
type_init(lm832x_register_types)
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