The MAX7310 GPIO controller was used only by the XScale-based Zaurus
machine types.  Now they have been removed we can remove this device
model as well.

Because this device is an I2C device, in theory it could be created
by users on the command line for boards with a different I2c
controller, but we don't believe users are doing this -- it would be
impossible on the command line to connect up the GPIO inputs/outputs.
The only example a web search produces for "device max7310" is a user
trying to create this because they didn't realize that there was no
way to manipulate the GPIO lines.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/gpio/max7310.c   | 217 --------------------------------------------
 hw/gpio/Kconfig     |   4 -
 hw/gpio/meson.build |   1 -
 3 files changed, 222 deletions(-)
 delete mode 100644 hw/gpio/max7310.c

diff --git a/hw/gpio/max7310.c b/hw/gpio/max7310.c
deleted file mode 100644
index 43a92b8db97..00000000000
--- a/hw/gpio/max7310.c
+++ /dev/null
@@ -1,217 +0,0 @@
-/*
- * MAX7310 8-port GPIO expansion chip.
- *
- * Copyright (c) 2006 Openedhand Ltd.
- * Written by Andrzej Zaborowski <balrog@zabor.org>
- *
- * This file is licensed under GNU GPL.
- */
-
-#include "qemu/osdep.h"
-#include "hw/i2c/i2c.h"
-#include "hw/irq.h"
-#include "migration/vmstate.h"
-#include "qemu/log.h"
-#include "qemu/module.h"
-#include "qom/object.h"
-
-#define TYPE_MAX7310 "max7310"
-OBJECT_DECLARE_SIMPLE_TYPE(MAX7310State, MAX7310)
-
-struct MAX7310State {
-    I2CSlave parent_obj;
-
-    int i2c_command_byte;
-    int len;
-
-    uint8_t level;
-    uint8_t direction;
-    uint8_t polarity;
-    uint8_t status;
-    uint8_t command;
-    qemu_irq handler[8];
-    qemu_irq *gpio_in;
-};
-
-static void max7310_reset(DeviceState *dev)
-{
-    MAX7310State *s = MAX7310(dev);
-
-    s->level &= s->direction;
-    s->direction = 0xff;
-    s->polarity = 0xf0;
-    s->status = 0x01;
-    s->command = 0x00;
-}
-
-static uint8_t max7310_rx(I2CSlave *i2c)
-{
-    MAX7310State *s = MAX7310(i2c);
-
-    switch (s->command) {
-    case 0x00:  /* Input port */
-        return s->level ^ s->polarity;
-
-    case 0x01:  /* Output port */
-        return s->level & ~s->direction;
-
-    case 0x02:  /* Polarity inversion */
-        return s->polarity;
-
-    case 0x03:  /* Configuration */
-        return s->direction;
-
-    case 0x04:  /* Timeout */
-        return s->status;
-
-    case 0xff:  /* Reserved */
-        return 0xff;
-
-    default:
-        qemu_log_mask(LOG_UNIMP, "%s: Unsupported register 0x02%" PRIx8 "\n",
-                      __func__, s->command);
-        break;
-    }
-    return 0xff;
-}
-
-static int max7310_tx(I2CSlave *i2c, uint8_t data)
-{
-    MAX7310State *s = MAX7310(i2c);
-    uint8_t diff;
-    int line;
-
-    if (s->len ++ > 1) {
-#ifdef VERBOSE
-        printf("%s: message too long (%i bytes)\n", __func__, s->len);
-#endif
-        return 1;
-    }
-
-    if (s->i2c_command_byte) {
-        s->command = data;
-        s->i2c_command_byte = 0;
-        return 0;
-    }
-
-    switch (s->command) {
-    case 0x01:  /* Output port */
-        for (diff = (data ^ s->level) & ~s->direction; diff;
-                        diff &= ~(1 << line)) {
-            line = ctz32(diff);
-            if (s->handler[line])
-                qemu_set_irq(s->handler[line], (data >> line) & 1);
-        }
-        s->level = (s->level & s->direction) | (data & ~s->direction);
-        break;
-
-    case 0x02:  /* Polarity inversion */
-        s->polarity = data;
-        break;
-
-    case 0x03:  /* Configuration */
-        s->level &= ~(s->direction ^ data);
-        s->direction = data;
-        break;
-
-    case 0x04:  /* Timeout */
-        s->status = data;
-        break;
-
-    case 0x00:  /* Input port - ignore writes */
-        break;
-    default:
-        qemu_log_mask(LOG_UNIMP, "%s: Unsupported register 0x02%" PRIx8 "\n",
-                      __func__, s->command);
-        return 1;
-    }
-
-    return 0;
-}
-
-static int max7310_event(I2CSlave *i2c, enum i2c_event event)
-{
-    MAX7310State *s = MAX7310(i2c);
-    s->len = 0;
-
-    switch (event) {
-    case I2C_START_SEND:
-        s->i2c_command_byte = 1;
-        break;
-    case I2C_FINISH:
-#ifdef VERBOSE
-        if (s->len == 1)
-            printf("%s: message too short (%i bytes)\n", __func__, s->len);
-#endif
-        break;
-    default:
-        break;
-    }
-
-    return 0;
-}
-
-static const VMStateDescription vmstate_max7310 = {
-    .name = "max7310",
-    .version_id = 0,
-    .minimum_version_id = 0,
-    .fields = (const VMStateField[]) {
-        VMSTATE_INT32(i2c_command_byte, MAX7310State),
-        VMSTATE_INT32(len, MAX7310State),
-        VMSTATE_UINT8(level, MAX7310State),
-        VMSTATE_UINT8(direction, MAX7310State),
-        VMSTATE_UINT8(polarity, MAX7310State),
-        VMSTATE_UINT8(status, MAX7310State),
-        VMSTATE_UINT8(command, MAX7310State),
-        VMSTATE_I2C_SLAVE(parent_obj, MAX7310State),
-        VMSTATE_END_OF_LIST()
-    }
-};
-
-static void max7310_gpio_set(void *opaque, int line, int level)
-{
-    MAX7310State *s = (MAX7310State *) opaque;
-    assert(line >= 0 && line < ARRAY_SIZE(s->handler));
-
-    if (level)
-        s->level |= s->direction & (1 << line);
-    else
-        s->level &= ~(s->direction & (1 << line));
-}
-
-/* MAX7310 is SMBus-compatible (can be used with only SMBus protocols),
- * but also accepts sequences that are not SMBus so return an I2C device.  */
-static void max7310_realize(DeviceState *dev, Error **errp)
-{
-    MAX7310State *s = MAX7310(dev);
-
-    qdev_init_gpio_in(dev, max7310_gpio_set, ARRAY_SIZE(s->handler));
-    qdev_init_gpio_out(dev, s->handler, ARRAY_SIZE(s->handler));
-}
-
-static void max7310_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    I2CSlaveClass *k = I2C_SLAVE_CLASS(klass);
-
-    dc->realize = max7310_realize;
-    k->event = max7310_event;
-    k->recv = max7310_rx;
-    k->send = max7310_tx;
-    device_class_set_legacy_reset(dc, max7310_reset);
-    dc->vmsd = &vmstate_max7310;
-}
-
-static const TypeInfo max7310_info = {
-    .name          = TYPE_MAX7310,
-    .parent        = TYPE_I2C_SLAVE,
-    .instance_size = sizeof(MAX7310State),
-    .class_init    = max7310_class_init,
-};
-
-static void max7310_register_types(void)
-{
-    type_register_static(&max7310_info);
-}
-
-type_init(max7310_register_types)
diff --git a/hw/gpio/Kconfig b/hw/gpio/Kconfig
index 843630d4f5f..c423e10f59f 100644
--- a/hw/gpio/Kconfig
+++ b/hw/gpio/Kconfig
@@ -1,7 +1,3 @@
-config MAX7310
-    bool
-    depends on I2C
-
 config PL061
     bool
 
diff --git a/hw/gpio/meson.build b/hw/gpio/meson.build
index 089b24802ef..74840619c01 100644
--- a/hw/gpio/meson.build
+++ b/hw/gpio/meson.build
@@ -1,7 +1,6 @@
 system_ss.add(when: 'CONFIG_GPIO_KEY', if_true: files('gpio_key.c'))
 system_ss.add(when: 'CONFIG_GPIO_MPC8XXX', if_true: files('mpc8xxx.c'))
 system_ss.add(when: 'CONFIG_GPIO_PWR', if_true: files('gpio_pwr.c'))
-system_ss.add(when: 'CONFIG_MAX7310', if_true: files('max7310.c'))
 system_ss.add(when: 'CONFIG_PCA9552', if_true: files('pca9552.c'))
 system_ss.add(when: 'CONFIG_PCA9554', if_true: files('pca9554.c'))
 system_ss.add(when: 'CONFIG_PL061', if_true: files('pl061.c'))
-- 
2.34.1

On 3/10/24 16:00, Peter Maydell wrote:
> The MAX7310 GPIO controller was used only by the XScale-based Zaurus
> machine types.  Now they have been removed we can remove this device
> model as well.
> 
> Because this device is an I2C device, in theory it could be created
> by users on the command line for boards with a different I2c
> controller, but we don't believe users are doing this -- it would be
> impossible on the command line to connect up the GPIO inputs/outputs.
> The only example a web search produces for "device max7310" is a user
> trying to create this because they didn't realize that there was no
> way to manipulate the GPIO lines.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>   hw/gpio/max7310.c   | 217 --------------------------------------------
>   hw/gpio/Kconfig     |   4 -
>   hw/gpio/meson.build |   1 -
>   3 files changed, 222 deletions(-)
>   delete mode 100644 hw/gpio/max7310.c

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>