diff options
| author | Glenn Miles <milesg@linux.vnet.ibm.com> | 2024-02-05 17:40:16 +1000 |
|---|---|---|
| committer | Nicholas Piggin <npiggin@gmail.com> | 2024-02-23 23:24:42 +1000 |
| commit | de0c7d543bcaf4cbde936668817f610bbd18e897 (patch) | |
| tree | 371ef316e9a664dc2c2e01549a3bc8714db09de3 /include | |
| parent | 7b85f008b68b5c1a59772cad2214366d6cb140f5 (diff) | |
misc: Add a pca9554 GPIO device model
Specs are available here:
https://www.nxp.com/docs/en/data-sheet/PCA9554_9554A.pdf
This is a simple model supporting the basic registers for GPIO
mode. The device also supports an interrupt output line but the
model does not yet support this.
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/hw/misc/pca9554.h | 36 | ||||
| -rw-r--r-- | include/hw/misc/pca9554_regs.h | 19 |
2 files changed, 55 insertions, 0 deletions
diff --git a/include/hw/misc/pca9554.h b/include/hw/misc/pca9554.h new file mode 100644 index 0000000000..54bfc4c4c7 --- /dev/null +++ b/include/hw/misc/pca9554.h @@ -0,0 +1,36 @@ +/* + * PCA9554 I/O port + * + * Copyright (c) 2023, IBM Corporation. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#ifndef PCA9554_H +#define PCA9554_H + +#include "hw/i2c/i2c.h" +#include "qom/object.h" + +#define TYPE_PCA9554 "pca9554" +typedef struct PCA9554State PCA9554State; +DECLARE_INSTANCE_CHECKER(PCA9554State, PCA9554, + TYPE_PCA9554) + +#define PCA9554_NR_REGS 4 +#define PCA9554_PIN_COUNT 8 + +struct PCA9554State { + /*< private >*/ + I2CSlave i2c; + /*< public >*/ + + uint8_t len; + uint8_t pointer; + + uint8_t regs[PCA9554_NR_REGS]; + qemu_irq gpio_out[PCA9554_PIN_COUNT]; + uint8_t ext_state[PCA9554_PIN_COUNT]; + char *description; /* For debugging purpose only */ +}; + +#endif diff --git a/include/hw/misc/pca9554_regs.h b/include/hw/misc/pca9554_regs.h new file mode 100644 index 0000000000..602c4a90e0 --- /dev/null +++ b/include/hw/misc/pca9554_regs.h @@ -0,0 +1,19 @@ +/* + * PCA9554 I/O port registers + * + * Copyright (c) 2023, IBM Corporation. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ +#ifndef PCA9554_REGS_H +#define PCA9554_REGS_H + +/* + * Bits [0:1] are used to address a specific register. + */ +#define PCA9554_INPUT 0 /* read only input register */ +#define PCA9554_OUTPUT 1 /* read/write pin output state */ +#define PCA9554_POLARITY 2 /* Set polarity of input register */ +#define PCA9554_CONFIG 3 /* Set pins as inputs our ouputs */ + +#endif |