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misc/pca9552: Add qom set and get

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Following the pattern of the work recently done with the ASPEED GPIO
model, this adds support for inspecting and modifying the PCA9552 LEDs
from the monitor.

 (qemu) qom-set  /machine/unattached/device[17] led0 on
 (qemu) qom-set  /machine/unattached/device[17] led0 off
 (qemu) qom-set  /machine/unattached/device[17] led0 pwm0
 (qemu) qom-set  /machine/unattached/device[17] led0 pwm1

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20200114103433.30534-6-clg@kaod.org
[clg: - removed the "qom-get" examples from the commit log
      - merged memory leak fixes from Joel ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Joel Stanley 2020-01-30 16:02:02 +00:00 committed by Peter Maydell
parent 1a15311a12
commit a90d8f8467
1 changed files with 90 additions and 0 deletions
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90
hw/misc/pca9552.c
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@ -15,12 +15,16 @@
#include "hw/misc/pca9552.h"
#include "hw/misc/pca9552_regs.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#define PCA9552_LED_ON 0x0
#define PCA9552_LED_OFF 0x1
#define PCA9552_LED_PWM0 0x2
#define PCA9552_LED_PWM1 0x3
static const char *led_state[] = {"on", "off", "pwm0", "pwm1"};
static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin)
{
uint8_t reg = PCA9552_LS0 + (pin / 4);
@ -169,6 +173,82 @@ static int pca9552_event(I2CSlave *i2c, enum i2c_event event)
return 0;
}
static void pca9552_get_led(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
PCA9552State *s = PCA9552(obj);
int led, rc, reg;
uint8_t state;
rc = sscanf(name, "led%2d", &led);
if (rc != 1) {
error_setg(errp, "%s: error reading %s", __func__, name);
return;
}
if (led < 0 || led > s->nr_leds) {
error_setg(errp, "%s invalid led %s", __func__, name);
return;
}
/*
* Get the LSx register as the qom interface should expose the device
* state, not the modeled 'input line' behaviour which would come from
* reading the INPUTx reg
*/
reg = PCA9552_LS0 + led / 4;
state = (pca9552_read(s, reg) >> (led % 8)) & 0x3;
visit_type_str(v, name, (char **)&led_state[state], errp);
}
/*
* Return an LED selector register value based on an existing one, with
* the appropriate 2-bit state value set for the given LED number (0-3).
*/
static inline uint8_t pca955x_ledsel(uint8_t oldval, int led_num, int state)
{
return (oldval & (~(0x3 << (led_num << 1)))) |
((state & 0x3) << (led_num << 1));
}
static void pca9552_set_led(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
PCA9552State *s = PCA9552(obj);
Error *local_err = NULL;
int led, rc, reg, val;
uint8_t state;
char *state_str;
visit_type_str(v, name, &state_str, &local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
rc = sscanf(name, "led%2d", &led);
if (rc != 1) {
error_setg(errp, "%s: error reading %s", __func__, name);
return;
}
if (led < 0 || led > s->nr_leds) {
error_setg(errp, "%s invalid led %s", __func__, name);
return;
}
for (state = 0; state < ARRAY_SIZE(led_state); state++) {
if (!strcmp(state_str, led_state[state])) {
break;
}
}
if (state >= ARRAY_SIZE(led_state)) {
error_setg(errp, "%s invalid led state %s", __func__, state_str);
return;
}
reg = PCA9552_LS0 + led / 4;
val = pca9552_read(s, reg);
val = pca955x_ledsel(val, led % 4, state);
pca9552_write(s, reg, val);
}
static const VMStateDescription pca9552_vmstate = {
.name = "PCA9552",
.version_id = 0,
@ -204,6 +284,7 @@ static void pca9552_reset(DeviceState *dev)
static void pca9552_initfn(Object *obj)
{
PCA9552State *s = PCA9552(obj);
int led;
/* If support for the other PCA955X devices are implemented, these
* constant values might be part of class structure describing the
@ -211,6 +292,15 @@ static void pca9552_initfn(Object *obj)
*/
s->max_reg = PCA9552_LS3;
s->nr_leds = 16;
for (led = 0; led < s->nr_leds; led++) {
char *name;
name = g_strdup_printf("led%d", led);
object_property_add(obj, name, "bool", pca9552_get_led, pca9552_set_led,
NULL, NULL, NULL);
g_free(name);
}
}
static void pca9552_class_init(ObjectClass *klass, void *data)