| Message ID | 20191118061757.52550-1-joel@jms.id.au (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | misc/pca9552: Add qom set and get | expand |
On 18/11/2019 07:17, Joel Stanley wrote: > 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-get /machine/unattached/device[17] led0 > "on" > > (qemu) qom-set /machine/unattached/device[17] led0 off > (qemu) qom-get /machine/unattached/device[17] led0 > "off" > > (qemu) qom-set /machine/unattached/device[17] led0 pwm0 > (qemu) qom-get /machine/unattached/device[17] led0 > "pwm0" > > (qemu) qom-set /machine/unattached/device[17] led0 pwm1 > (qemu) qom-get /machine/unattached/device[17] led0 > "pwm1" It would be nice to revive the QOM get patchset from David. http://patchwork.ozlabs.org/patch/666458/ Did we reach some consensus ? > Signed-off-by: Joel Stanley <joel@jms.id.au> Some comments below. > --- > The qom device in mainline qemu is a different path. Using the monitor > examine `info qom-tree /machine/unattached/` to discover it. > > This can be tested with a Witherspoon image. > > $ wget https://openpower.xyz/job/openbmc-build/distro=ubuntu,label=builder,target=witherspoon/lastSuccessfulBuild/artifact/deploy/images/witherspoon/obmc-phosphor-image-witherspoon.ubi.mtd > > $ qemu-system-arm -M witherspoon-bmc -serial pty -monitor pty -nographic \ > -drive file=obmc-phosphor-image-witherspoon.ubi.mtd,format=raw,if=mtd > char device redirected to /dev/pts/5 (label compat_monitor0) > char device redirected to /dev/pts/10 (label serial0) > > $ screen /dev/pts/5 > QEMU 4.1.91 monitor - type 'help' for more information > (qemu) qom-get /machine/unattached/device[17] led0 > "off" > > $ screen /dev/pts/19 > root@witherspoon:~# cd /sys/class/gpio/ > root@witherspoon:/sys/class/gpio# echo 248 > export > root@witherspoon:/sys/class/gpio# cat gpio248/value > 0 > > (qemu) qom-set /machine/unattached/device[17] led0 on > > root@witherspoon:/sys/class/gpio# echo out > gpio248/direction > root@witherspoon:/sys/class/gpio# cat gpio248/value > 1 > > (qemu) qom-get /machine/unattached/device[17] led0 > "on" > > (qemu) qom-set /machine/unattached/device[17] led0 off > (qemu) qom-get /machine/unattached/device[17] led0 > "off" > > root@witherspoon:/sys/class/gpio# cat gpio248/value > 0 > > Signed-off-by: Joel Stanley <joel@jms.id.au> > --- > hw/misc/pca9552.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 91 insertions(+) > > diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c > index 73be28d9369c..0362aac8c862 100644 > --- a/hw/misc/pca9552.c > +++ b/hw/misc/pca9552.c > @@ -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 +173,84 @@ 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; > + char *str; > + 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; Could we add accessors to extract the register fields and to clarify the layout ? > + str = g_strdup(led_state[state]); > + visit_type_str(v, name, &str, 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 +286,7 @@ 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 +294,14 @@ 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); It misses a : g_free(name) C. > + } > } > > static void pca9552_class_init(ObjectClass *klass, void *data) >
Odd... I only received Cédric answer, not Joel patch. On 11/18/19 11:00 AM, Cédric Le Goater wrote: > On 18/11/2019 07:17, Joel Stanley wrote: >> 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-get /machine/unattached/device[17] led0 >> "on" >> >> (qemu) qom-set /machine/unattached/device[17] led0 off >> (qemu) qom-get /machine/unattached/device[17] led0 >> "off" >> >> (qemu) qom-set /machine/unattached/device[17] led0 pwm0 >> (qemu) qom-get /machine/unattached/device[17] led0 >> "pwm0" >> >> (qemu) qom-set /machine/unattached/device[17] led0 pwm1 >> (qemu) qom-get /machine/unattached/device[17] led0 >> "pwm1" > > It would be nice to revive the QOM get patchset from David. > > http://patchwork.ozlabs.org/patch/666458/ > > Did we reach some consensus ? > >> Signed-off-by: Joel Stanley <joel@jms.id.au> > > Some comments below. > >> --- >> The qom device in mainline qemu is a different path. Using the monitor >> examine `info qom-tree /machine/unattached/` to discover it. >> >> This can be tested with a Witherspoon image. >> >> $ wget https://openpower.xyz/job/openbmc-build/distro=ubuntu,label=builder,target=witherspoon/lastSuccessfulBuild/artifact/deploy/images/witherspoon/obmc-phosphor-image-witherspoon.ubi.mtd >> >> $ qemu-system-arm -M witherspoon-bmc -serial pty -monitor pty -nographic \ >> -drive file=obmc-phosphor-image-witherspoon.ubi.mtd,format=raw,if=mtd >> char device redirected to /dev/pts/5 (label compat_monitor0) >> char device redirected to /dev/pts/10 (label serial0) >> >> $ screen /dev/pts/5 >> QEMU 4.1.91 monitor - type 'help' for more information >> (qemu) qom-get /machine/unattached/device[17] led0 >> "off" >> >> $ screen /dev/pts/19 >> root@witherspoon:~# cd /sys/class/gpio/ >> root@witherspoon:/sys/class/gpio# echo 248 > export >> root@witherspoon:/sys/class/gpio# cat gpio248/value >> 0 >> >> (qemu) qom-set /machine/unattached/device[17] led0 on >> >> root@witherspoon:/sys/class/gpio# echo out > gpio248/direction >> root@witherspoon:/sys/class/gpio# cat gpio248/value >> 1 >> >> (qemu) qom-get /machine/unattached/device[17] led0 >> "on" >> >> (qemu) qom-set /machine/unattached/device[17] led0 off >> (qemu) qom-get /machine/unattached/device[17] led0 >> "off" >> >> root@witherspoon:/sys/class/gpio# cat gpio248/value >> 0 I am assuming this is 5.0 material. This is a good starting point, and is useful. However this would be useful for other boards/devices too. What about defining a InterfaceInfo[] for external GPIOs? Shouldn't we use the qemu_irq type for that then? >> >> Signed-off-by: Joel Stanley <joel@jms.id.au> >> --- >> hw/misc/pca9552.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ >> 1 file changed, 91 insertions(+) >> >> diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c >> index 73be28d9369c..0362aac8c862 100644 >> --- a/hw/misc/pca9552.c >> +++ b/hw/misc/pca9552.c >> @@ -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"}; BTW "pwm0/pwm1" as "state" is confuse, but I understand this is how the PCA9552 datasheet describes it. >> + >> static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin) >> { >> uint8_t reg = PCA9552_LS0 + (pin / 4); >> @@ -169,6 +173,84 @@ 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; >> + char *str; >> + 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; > > Could we add accessors to extract the register fields and to clarify > the layout ? > >> + str = g_strdup(led_state[state]); >> + visit_type_str(v, name, &str, 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 +286,7 @@ 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 +294,14 @@ 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); > > It misses a : > > g_free(name) > > C. > >> + } >> } >> >> static void pca9552_class_init(ObjectClass *klass, void *data) >> > >
On 18/11/2019 18:48, Philippe Mathieu-Daudé wrote: > Odd... I only received Cédric answer, not Joel patch. > > On 11/18/19 11:00 AM, Cédric Le Goater wrote: >> On 18/11/2019 07:17, Joel Stanley wrote: >>> 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-get /machine/unattached/device[17] led0 >>> "on" >>> >>> (qemu) qom-set /machine/unattached/device[17] led0 off >>> (qemu) qom-get /machine/unattached/device[17] led0 >>> "off" >>> >>> (qemu) qom-set /machine/unattached/device[17] led0 pwm0 >>> (qemu) qom-get /machine/unattached/device[17] led0 >>> "pwm0" >>> >>> (qemu) qom-set /machine/unattached/device[17] led0 pwm1 >>> (qemu) qom-get /machine/unattached/device[17] led0 >>> "pwm1" >> >> It would be nice to revive the QOM get patchset from David. >> >> http://patchwork.ozlabs.org/patch/666458/ >> >> Did we reach some consensus ? >> >>> Signed-off-by: Joel Stanley <joel@jms.id.au> >> >> Some comments below. >> >>> --- >>> The qom device in mainline qemu is a different path. Using the monitor >>> examine `info qom-tree /machine/unattached/` to discover it. >>> >>> This can be tested with a Witherspoon image. >>> >>> $ wget https://openpower.xyz/job/openbmc-build/distro=ubuntu,label=builder,target=witherspoon/lastSuccessfulBuild/artifact/deploy/images/witherspoon/obmc-phosphor-image-witherspoon.ubi.mtd >>> >>> $ qemu-system-arm -M witherspoon-bmc -serial pty -monitor pty -nographic \ >>> -drive file=obmc-phosphor-image-witherspoon.ubi.mtd,format=raw,if=mtd >>> char device redirected to /dev/pts/5 (label compat_monitor0) >>> char device redirected to /dev/pts/10 (label serial0) >>> >>> $ screen /dev/pts/5 >>> QEMU 4.1.91 monitor - type 'help' for more information >>> (qemu) qom-get /machine/unattached/device[17] led0 >>> "off" >>> >>> $ screen /dev/pts/19 >>> root@witherspoon:~# cd /sys/class/gpio/ >>> root@witherspoon:/sys/class/gpio# echo 248 > export >>> root@witherspoon:/sys/class/gpio# cat gpio248/value >>> 0 >>> >>> (qemu) qom-set /machine/unattached/device[17] led0 on >>> >>> root@witherspoon:/sys/class/gpio# echo out > gpio248/direction >>> root@witherspoon:/sys/class/gpio# cat gpio248/value >>> 1 >>> >>> (qemu) qom-get /machine/unattached/device[17] led0 >>> "on" >>> >>> (qemu) qom-set /machine/unattached/device[17] led0 off >>> (qemu) qom-get /machine/unattached/device[17] led0 >>> "off" >>> >>> root@witherspoon:/sys/class/gpio# cat gpio248/value >>> 0 > > I am assuming this is 5.0 material. > > This is a good starting point, and is useful. > > However this would be useful for other boards/devices too. > > What about defining a InterfaceInfo[] for external GPIOs? The code below is very specific to pca9552. What kind of interface do you have in mind more precisely ? which handlers ? Thanks C. > Shouldn't we use the qemu_irq type for that then? > >>> >>> Signed-off-by: Joel Stanley <joel@jms.id.au> >>> --- >>> hw/misc/pca9552.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ >>> 1 file changed, 91 insertions(+) >>> >>> diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c >>> index 73be28d9369c..0362aac8c862 100644 >>> --- a/hw/misc/pca9552.c >>> +++ b/hw/misc/pca9552.c >>> @@ -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"}; > > BTW "pwm0/pwm1" as "state" is confuse, but I understand this is how the PCA9552 datasheet describes it. > >>> + >>> static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin) >>> { >>> uint8_t reg = PCA9552_LS0 + (pin / 4); >>> @@ -169,6 +173,84 @@ 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; >>> + char *str; >>> + 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; >> >> Could we add accessors to extract the register fields and to clarify >> the layout ? >> >>> + str = g_strdup(led_state[state]); >>> + visit_type_str(v, name, &str, 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 +286,7 @@ 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 +294,14 @@ 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); >> >> It misses a : >> >> g_free(name) >> >> C. >> >>> + } >>> } >>> static void pca9552_class_init(ObjectClass *klass, void *data) >>> >> >> >
On 11/19/19 5:27 PM, Cédric Le Goater wrote: > On 18/11/2019 18:48, Philippe Mathieu-Daudé wrote: >> Odd... I only received Cédric answer, not Joel patch. >> >> On 11/18/19 11:00 AM, Cédric Le Goater wrote: >>> On 18/11/2019 07:17, Joel Stanley wrote: >>>> 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-get /machine/unattached/device[17] led0 >>>> "on" >>>> >>>> (qemu) qom-set /machine/unattached/device[17] led0 off >>>> (qemu) qom-get /machine/unattached/device[17] led0 >>>> "off" >>>> >>>> (qemu) qom-set /machine/unattached/device[17] led0 pwm0 >>>> (qemu) qom-get /machine/unattached/device[17] led0 >>>> "pwm0" >>>> >>>> (qemu) qom-set /machine/unattached/device[17] led0 pwm1 >>>> (qemu) qom-get /machine/unattached/device[17] led0 >>>> "pwm1" >>> >>> It would be nice to revive the QOM get patchset from David. >>> >>> http://patchwork.ozlabs.org/patch/666458/ >>> >>> Did we reach some consensus ? >>> >>>> Signed-off-by: Joel Stanley <joel@jms.id.au> >>> >>> Some comments below. >>> >>>> --- >>>> The qom device in mainline qemu is a different path. Using the monitor >>>> examine `info qom-tree /machine/unattached/` to discover it. >>>> >>>> This can be tested with a Witherspoon image. >>>> >>>> $ wget https://openpower.xyz/job/openbmc-build/distro=ubuntu,label=builder,target=witherspoon/lastSuccessfulBuild/artifact/deploy/images/witherspoon/obmc-phosphor-image-witherspoon.ubi.mtd >>>> >>>> $ qemu-system-arm -M witherspoon-bmc -serial pty -monitor pty -nographic \ >>>> -drive file=obmc-phosphor-image-witherspoon.ubi.mtd,format=raw,if=mtd >>>> char device redirected to /dev/pts/5 (label compat_monitor0) >>>> char device redirected to /dev/pts/10 (label serial0) >>>> >>>> $ screen /dev/pts/5 >>>> QEMU 4.1.91 monitor - type 'help' for more information >>>> (qemu) qom-get /machine/unattached/device[17] led0 >>>> "off" >>>> >>>> $ screen /dev/pts/19 >>>> root@witherspoon:~# cd /sys/class/gpio/ >>>> root@witherspoon:/sys/class/gpio# echo 248 > export >>>> root@witherspoon:/sys/class/gpio# cat gpio248/value >>>> 0 >>>> >>>> (qemu) qom-set /machine/unattached/device[17] led0 on >>>> >>>> root@witherspoon:/sys/class/gpio# echo out > gpio248/direction >>>> root@witherspoon:/sys/class/gpio# cat gpio248/value >>>> 1 >>>> >>>> (qemu) qom-get /machine/unattached/device[17] led0 >>>> "on" >>>> >>>> (qemu) qom-set /machine/unattached/device[17] led0 off >>>> (qemu) qom-get /machine/unattached/device[17] led0 >>>> "off" >>>> >>>> root@witherspoon:/sys/class/gpio# cat gpio248/value >>>> 0 >> >> I am assuming this is 5.0 material. >> >> This is a good starting point, and is useful. >> >> However this would be useful for other boards/devices too. >> >> What about defining a InterfaceInfo[] for external GPIOs? > > The code below is very specific to pca9552. Yes, sorry if I was unclear, I don't want to delay this series, I was just thinking about other uses. > What kind of interface do you have in mind more precisely ? > which handlers ? Here we expose the devices GPIOs (as output) so they can be modified via QMP. A QMP client could subscribe to GPIOs input events (or IRQ triggered). (The PCA9552 can also use the 16 lines as input, but Joel added a "input line behaviour not modeled" comment below). Maybe the PCA9552 isn't the best example for my generic use case, because it is already "out of the soc/board" being on a bus. I'm more concerned about a generic QMP way to access GPIOs from a SoC exposed to a physical user of a board. >> Shouldn't we use the qemu_irq type for that then? >> >>>> >>>> Signed-off-by: Joel Stanley <joel@jms.id.au> >>>> --- >>>> hw/misc/pca9552.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ >>>> 1 file changed, 91 insertions(+) >>>> >>>> diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c >>>> index 73be28d9369c..0362aac8c862 100644 >>>> --- a/hw/misc/pca9552.c >>>> +++ b/hw/misc/pca9552.c >>>> @@ -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"}; >> >> BTW "pwm0/pwm1" as "state" is confuse, but I understand this is how the PCA9552 datasheet describes it. >> >>>> + >>>> static uint8_t pca9552_pin_get_config(PCA9552State *s, int pin) >>>> { >>>> uint8_t reg = PCA9552_LS0 + (pin / 4); >>>> @@ -169,6 +173,84 @@ 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; >>>> + char *str; >>>> + 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; >>> >>> Could we add accessors to extract the register fields and to clarify >>> the layout ? >>> >>>> + str = g_strdup(led_state[state]); >>>> + visit_type_str(v, name, &str, 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 +286,7 @@ 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 +294,14 @@ 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); >>> >>> It misses a : >>> >>> g_free(name) >>> >>> C. >>> >>>> + } >>>> } >>>> static void pca9552_class_init(ObjectClass *klass, void *data) >>>> >>> >>> >> >
* Cédric Le Goater (clg@kaod.org) wrote: > On 18/11/2019 07:17, Joel Stanley wrote: > > 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-get /machine/unattached/device[17] led0 > > "on" > > > > (qemu) qom-set /machine/unattached/device[17] led0 off > > (qemu) qom-get /machine/unattached/device[17] led0 > > "off" > > > > (qemu) qom-set /machine/unattached/device[17] led0 pwm0 > > (qemu) qom-get /machine/unattached/device[17] led0 > > "pwm0" > > > > (qemu) qom-set /machine/unattached/device[17] led0 pwm1 > > (qemu) qom-get /machine/unattached/device[17] led0 > > "pwm1" > > It would be nice to revive the QOM get patchset from David. > > http://patchwork.ozlabs.org/patch/666458/ > > Did we reach some consensus ? I don't think so; there were some other people implementing similar patches; it got bogged down in the question of string visitors and I hadn't dug to see if that's got fixed in the last 3 years. Dave > > Signed-off-by: Joel Stanley <joel@jms.id.au> > > Some comments below. > > > --- > > The qom device in mainline qemu is a different path. Using the monitor > > examine `info qom-tree /machine/unattached/` to discover it. > > > > This can be tested with a Witherspoon image. > > > > $ wget https://openpower.xyz/job/openbmc-build/distro=ubuntu,label=builder,target=witherspoon/lastSuccessfulBuild/artifact/deploy/images/witherspoon/obmc-phosphor-image-witherspoon.ubi.mtd > > > > $ qemu-system-arm -M witherspoon-bmc -serial pty -monitor pty -nographic \ > > -drive file=obmc-phosphor-image-witherspoon.ubi.mtd,format=raw,if=mtd > > char device redirected to /dev/pts/5 (label compat_monitor0) > > char device redirected to /dev/pts/10 (label serial0) > > > > $ screen /dev/pts/5 > > QEMU 4.1.91 monitor - type 'help' for more information > > (qemu) qom-get /machine/unattached/device[17] led0 > > "off" > > > > $ screen /dev/pts/19 > > root@witherspoon:~# cd /sys/class/gpio/ > > root@witherspoon:/sys/class/gpio# echo 248 > export > > root@witherspoon:/sys/class/gpio# cat gpio248/value > > 0 > > > > (qemu) qom-set /machine/unattached/device[17] led0 on > > > > root@witherspoon:/sys/class/gpio# echo out > gpio248/direction > > root@witherspoon:/sys/class/gpio# cat gpio248/value > > 1 > > > > (qemu) qom-get /machine/unattached/device[17] led0 > > "on" > > > > (qemu) qom-set /machine/unattached/device[17] led0 off > > (qemu) qom-get /machine/unattached/device[17] led0 > > "off" > > > > root@witherspoon:/sys/class/gpio# cat gpio248/value > > 0 > > > > Signed-off-by: Joel Stanley <joel@jms.id.au> > > --- > > hw/misc/pca9552.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 91 insertions(+) > > > > diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c > > index 73be28d9369c..0362aac8c862 100644 > > --- a/hw/misc/pca9552.c > > +++ b/hw/misc/pca9552.c > > @@ -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 +173,84 @@ 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; > > + char *str; > > + 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; > > Could we add accessors to extract the register fields and to clarify > the layout ? > > > + str = g_strdup(led_state[state]); > > + visit_type_str(v, name, &str, 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 +286,7 @@ 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 +294,14 @@ 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); > > It misses a : > > g_free(name) > > C. > > > + } > > } > > > > static void pca9552_class_init(ObjectClass *klass, void *data) > > > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
diff --git a/hw/misc/pca9552.c b/hw/misc/pca9552.c index 73be28d9369c..0362aac8c862 100644 --- a/hw/misc/pca9552.c +++ b/hw/misc/pca9552.c @@ -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 +173,84 @@ 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; + char *str; + 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; + str = g_strdup(led_state[state]); + visit_type_str(v, name, &str, 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 +286,7 @@ 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 +294,14 @@ 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); + } } static void pca9552_class_init(ObjectClass *klass, void *data)