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Diffstat (limited to 'hw/misc/pca9552.c')
-rw-r--r--hw/misc/pca9552.c216
1 files changed, 162 insertions, 54 deletions
diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c
index cac729e35a..80caa9ec8f 100644
--- a/hw/misc/pca9552.c
+++ b/hw/misc/pca9552.c
@@ -4,6 +4,7 @@
* https://www.nxp.com/docs/en/application-note/AN264.pdf
*
* Copyright (c) 2017-2018, IBM Corporation.
+ * Copyright (c) 2020 Philippe Mathieu-Daudé
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
@@ -12,11 +13,29 @@
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
+#include "qemu/bitops.h"
+#include "hw/qdev-properties.h"
#include "hw/misc/pca9552.h"
#include "hw/misc/pca9552_regs.h"
+#include "hw/irq.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
+#include "trace.h"
+
+typedef struct PCA955xClass {
+ /*< private >*/
+ I2CSlaveClass parent_class;
+ /*< public >*/
+
+ uint8_t pin_count;
+ uint8_t max_reg;
+} PCA955xClass;
+
+#define PCA955X_CLASS(klass) \
+ OBJECT_CLASS_CHECK(PCA955xClass, (klass), TYPE_PCA955X)
+#define PCA955X_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(PCA955xClass, (obj), TYPE_PCA955X)
#define PCA9552_LED_ON 0x0
#define PCA9552_LED_OFF 0x1
@@ -25,7 +44,7 @@
static const char *led_state[] = {"on", "off", "pwm0", "pwm1"};
-static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin)
+static uint8_t pca955x_pin_get_config(PCA955xState *s, int pin)
{
uint8_t reg = PCA9552_LS0 + (pin / 4);
uint8_t shift = (pin % 4) << 1;
@@ -33,20 +52,71 @@ static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin)
return extract32(s->regs[reg], shift, 2);
}
-static void pca9552_update_pin_input(PCA9552State *s)
+/* Return INPUT status (bit #N belongs to GPIO #N) */
+static uint16_t pca955x_pins_get_status(PCA955xState *s)
+{
+ return (s->regs[PCA9552_INPUT1] << 8) | s->regs[PCA9552_INPUT0];
+}
+
+static void pca955x_display_pins_status(PCA955xState *s,
+ uint16_t previous_pins_status)
{
+ PCA955xClass *k = PCA955X_GET_CLASS(s);
+ uint16_t pins_status, pins_changed;
int i;
- for (i = 0; i < s->nr_leds; i++) {
+ pins_status = pca955x_pins_get_status(s);
+ pins_changed = previous_pins_status ^ pins_status;
+ if (!pins_changed) {
+ return;
+ }
+ if (trace_event_get_state_backends(TRACE_PCA955X_GPIO_STATUS)) {
+ char *buf = g_newa(char, k->pin_count + 1);
+
+ for (i = 0; i < k->pin_count; i++) {
+ if (extract32(pins_status, i, 1)) {
+ buf[i] = '*';
+ } else {
+ buf[i] = '.';
+ }
+ }
+ buf[i] = '\0';
+ trace_pca955x_gpio_status(s->description, buf);
+ }
+ if (trace_event_get_state_backends(TRACE_PCA955X_GPIO_CHANGE)) {
+ for (i = 0; i < k->pin_count; i++) {
+ if (extract32(pins_changed, i, 1)) {
+ unsigned new_state = extract32(pins_status, i, 1);
+
+ /*
+ * We display the state using the PCA logic ("active-high").
+ * This is not the state of the LED, which signal might be
+ * wired "active-low" on the board.
+ */
+ trace_pca955x_gpio_change(s->description, i,
+ !new_state, new_state);
+ }
+ }
+ }
+}
+
+static void pca955x_update_pin_input(PCA955xState *s)
+{
+ PCA955xClass *k = PCA955X_GET_CLASS(s);
+ int i;
+
+ for (i = 0; i < k->pin_count; i++) {
uint8_t input_reg = PCA9552_INPUT0 + (i / 8);
uint8_t input_shift = (i % 8);
- uint8_t config = pca9552_pin_get_config(s, i);
+ uint8_t config = pca955x_pin_get_config(s, i);
switch (config) {
case PCA9552_LED_ON:
+ qemu_set_irq(s->gpio[i], 1);
s->regs[input_reg] |= 1 << input_shift;
break;
case PCA9552_LED_OFF:
+ qemu_set_irq(s->gpio[i], 0);
s->regs[input_reg] &= ~(1 << input_shift);
break;
case PCA9552_LED_PWM0:
@@ -58,7 +128,7 @@ static void pca9552_update_pin_input(PCA9552State *s)
}
}
-static uint8_t pca9552_read(PCA9552State *s, uint8_t reg)
+static uint8_t pca955x_read(PCA955xState *s, uint8_t reg)
{
switch (reg) {
case PCA9552_INPUT0:
@@ -79,8 +149,10 @@ static uint8_t pca9552_read(PCA9552State *s, uint8_t reg)
}
}
-static void pca9552_write(PCA9552State *s, uint8_t reg, uint8_t data)
+static void pca955x_write(PCA955xState *s, uint8_t reg, uint8_t data)
{
+ uint16_t pins_status;
+
switch (reg) {
case PCA9552_PSC0:
case PCA9552_PWM0:
@@ -93,8 +165,10 @@ static void pca9552_write(PCA9552State *s, uint8_t reg, uint8_t data)
case PCA9552_LS1:
case PCA9552_LS2:
case PCA9552_LS3:
+ pins_status = pca955x_pins_get_status(s);
s->regs[reg] = data;
- pca9552_update_pin_input(s);
+ pca955x_update_pin_input(s);
+ pca955x_display_pins_status(s, pins_status);
break;
case PCA9552_INPUT0:
@@ -110,22 +184,24 @@ static void pca9552_write(PCA9552State *s, uint8_t reg, uint8_t data)
* after each byte is sent to or received by the device. The index
* rollovers to 0 when the maximum register address is reached.
*/
-static void pca9552_autoinc(PCA9552State *s)
+static void pca955x_autoinc(PCA955xState *s)
{
+ PCA955xClass *k = PCA955X_GET_CLASS(s);
+
if (s->pointer != 0xFF && s->pointer & PCA9552_AUTOINC) {
uint8_t reg = s->pointer & 0xf;
- reg = (reg + 1) % (s->max_reg + 1);
+ reg = (reg + 1) % (k->max_reg + 1);
s->pointer = reg | PCA9552_AUTOINC;
}
}
-static uint8_t pca9552_recv(I2CSlave *i2c)
+static uint8_t pca955x_recv(I2CSlave *i2c)
{
- PCA9552State *s = PCA9552(i2c);
+ PCA955xState *s = PCA955X(i2c);
uint8_t ret;
- ret = pca9552_read(s, s->pointer & 0xf);
+ ret = pca955x_read(s, s->pointer & 0xf);
/*
* From the Specs:
@@ -143,40 +219,41 @@ static uint8_t pca9552_recv(I2CSlave *i2c)
__func__);
}
- pca9552_autoinc(s);
+ pca955x_autoinc(s);
return ret;
}
-static int pca9552_send(I2CSlave *i2c, uint8_t data)
+static int pca955x_send(I2CSlave *i2c, uint8_t data)
{
- PCA9552State *s = PCA9552(i2c);
+ PCA955xState *s = PCA955X(i2c);
/* First byte sent by is the register address */
if (s->len == 0) {
s->pointer = data;
s->len++;
} else {
- pca9552_write(s, s->pointer & 0xf, data);
+ pca955x_write(s, s->pointer & 0xf, data);
- pca9552_autoinc(s);
+ pca955x_autoinc(s);
}
return 0;
}
-static int pca9552_event(I2CSlave *i2c, enum i2c_event event)
+static int pca955x_event(I2CSlave *i2c, enum i2c_event event)
{
- PCA9552State *s = PCA9552(i2c);
+ PCA955xState *s = PCA955X(i2c);
s->len = 0;
return 0;
}
-static void pca9552_get_led(Object *obj, Visitor *v, const char *name,
+static void pca955x_get_led(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
- PCA9552State *s = PCA9552(obj);
+ PCA955xClass *k = PCA955X_GET_CLASS(obj);
+ PCA955xState *s = PCA955X(obj);
int led, rc, reg;
uint8_t state;
@@ -185,7 +262,7 @@ static void pca9552_get_led(Object *obj, Visitor *v, const char *name,
error_setg(errp, "%s: error reading %s", __func__, name);
return;
}
- if (led < 0 || led > s->nr_leds) {
+ if (led < 0 || led > k->pin_count) {
error_setg(errp, "%s invalid led %s", __func__, name);
return;
}
@@ -195,7 +272,7 @@ static void pca9552_get_led(Object *obj, Visitor *v, const char *name,
* reading the INPUTx reg
*/
reg = PCA9552_LS0 + led / 4;
- state = (pca9552_read(s, reg) >> (led % 8)) & 0x3;
+ state = (pca955x_read(s, reg) >> (led % 8)) & 0x3;
visit_type_str(v, name, (char **)&led_state[state], errp);
}
@@ -209,10 +286,11 @@ static inline uint8_t pca955x_ledsel(uint8_t oldval, int led_num, int state)
((state & 0x3) << (led_num << 1));
}
-static void pca9552_set_led(Object *obj, Visitor *v, const char *name,
+static void pca955x_set_led(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
- PCA9552State *s = PCA9552(obj);
+ PCA955xClass *k = PCA955X_GET_CLASS(obj);
+ PCA955xState *s = PCA955X(obj);
Error *local_err = NULL;
int led, rc, reg, val;
uint8_t state;
@@ -228,7 +306,7 @@ static void pca9552_set_led(Object *obj, Visitor *v, const char *name,
error_setg(errp, "%s: error reading %s", __func__, name);
return;
}
- if (led < 0 || led > s->nr_leds) {
+ if (led < 0 || led > k->pin_count) {
error_setg(errp, "%s invalid led %s", __func__, name);
return;
}
@@ -244,9 +322,9 @@ static void pca9552_set_led(Object *obj, Visitor *v, const char *name,
}
reg = PCA9552_LS0 + led / 4;
- val = pca9552_read(s, reg);
+ val = pca955x_read(s, reg);
val = pca955x_ledsel(val, led % 4, state);
- pca9552_write(s, reg, val);
+ pca955x_write(s, reg, val);
}
static const VMStateDescription pca9552_vmstate = {
@@ -254,17 +332,17 @@ static const VMStateDescription pca9552_vmstate = {
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
- VMSTATE_UINT8(len, PCA9552State),
- VMSTATE_UINT8(pointer, PCA9552State),
- VMSTATE_UINT8_ARRAY(regs, PCA9552State, PCA9552_NR_REGS),
- VMSTATE_I2C_SLAVE(i2c, PCA9552State),
+ VMSTATE_UINT8(len, PCA955xState),
+ VMSTATE_UINT8(pointer, PCA955xState),
+ VMSTATE_UINT8_ARRAY(regs, PCA955xState, PCA955X_NR_REGS),
+ VMSTATE_I2C_SLAVE(i2c, PCA955xState),
VMSTATE_END_OF_LIST()
}
};
static void pca9552_reset(DeviceState *dev)
{
- PCA9552State *s = PCA9552(dev);
+ PCA955xState *s = PCA955X(dev);
s->regs[PCA9552_PSC0] = 0xFF;
s->regs[PCA9552_PWM0] = 0x80;
@@ -275,57 +353,87 @@ static void pca9552_reset(DeviceState *dev)
s->regs[PCA9552_LS2] = 0x55;
s->regs[PCA9552_LS3] = 0x55;
- pca9552_update_pin_input(s);
+ pca955x_update_pin_input(s);
s->pointer = 0xFF;
s->len = 0;
}
-static void pca9552_initfn(Object *obj)
+static void pca955x_initfn(Object *obj)
{
- PCA9552State *s = PCA9552(obj);
+ PCA955xClass *k = PCA955X_GET_CLASS(obj);
int led;
- /* If support for the other PCA955X devices are implemented, these
- * constant values might be part of class structure describing the
- * PCA955X device
- */
- s->max_reg = PCA9552_LS3;
- s->nr_leds = 16;
-
- for (led = 0; led < s->nr_leds; led++) {
+ assert(k->pin_count <= PCA955X_PIN_COUNT_MAX);
+ for (led = 0; led < k->pin_count; led++) {
char *name;
name = g_strdup_printf("led%d", led);
- object_property_add(obj, name, "bool", pca9552_get_led, pca9552_set_led,
+ object_property_add(obj, name, "bool", pca955x_get_led, pca955x_set_led,
NULL, NULL);
g_free(name);
}
}
-static void pca9552_class_init(ObjectClass *klass, void *data)
+static void pca955x_realize(DeviceState *dev, Error **errp)
+{
+ PCA955xClass *k = PCA955X_GET_CLASS(dev);
+ PCA955xState *s = PCA955X(dev);
+
+ if (!s->description) {
+ s->description = g_strdup("pca-unspecified");
+ }
+
+ qdev_init_gpio_out(dev, s->gpio, k->pin_count);
+}
+
+static Property pca955x_properties[] = {
+ DEFINE_PROP_STRING("description", PCA955xState, description),
+ DEFINE_PROP_END_OF_LIST(),
+};
+
+static void pca955x_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
- k->event = pca9552_event;
- k->recv = pca9552_recv;
- k->send = pca9552_send;
+ k->event = pca955x_event;
+ k->recv = pca955x_recv;
+ k->send = pca955x_send;
+ dc->realize = pca955x_realize;
+ device_class_set_props(dc, pca955x_properties);
+}
+
+static const TypeInfo pca955x_info = {
+ .name = TYPE_PCA955X,
+ .parent = TYPE_I2C_SLAVE,
+ .instance_init = pca955x_initfn,
+ .instance_size = sizeof(PCA955xState),
+ .class_init = pca955x_class_init,
+ .abstract = true,
+};
+
+static void pca9552_class_init(ObjectClass *oc, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(oc);
+ PCA955xClass *pc = PCA955X_CLASS(oc);
+
dc->reset = pca9552_reset;
dc->vmsd = &pca9552_vmstate;
+ pc->max_reg = PCA9552_LS3;
+ pc->pin_count = 16;
}
static const TypeInfo pca9552_info = {
.name = TYPE_PCA9552,
- .parent = TYPE_I2C_SLAVE,
- .instance_init = pca9552_initfn,
- .instance_size = sizeof(PCA9552State),
+ .parent = TYPE_PCA955X,
.class_init = pca9552_class_init,
};
-static void pca9552_register_types(void)
+static void pca955x_register_types(void)
{
+ type_register_static(&pca955x_info);
type_register_static(&pca9552_info);
}
-type_init(pca9552_register_types)
+type_init(pca955x_register_types)
generated by cgit v1.2.3 (git 2.26.2) at 2025-02-12 23:05:06 +0000