feat(drivers): Add mcp23017 driver based on upstream mcp23s17 one.

* Upstream Zephyr has in progress driver, so doing this locally here,
  until we can move over to that driver.

1 files changed, 86 insertions, 0 deletions

diff --git a/app/drivers/gpio/gpio_mcp23017.h b/app/drivers/gpio/gpio_mcp23017.h
new file mode 100644
index 0000000..026565c
--- /dev/null
+++ b/app/drivers/gpio/gpio_mcp23017.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2020 Geanix ApS, Pete Johanson
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file Header file for the MCP23017 driver.
+ */
+
+#ifndef ZEPHYR_DRIVERS_GPIO_GPIO_MCP23017_H_
+#define ZEPHYR_DRIVERS_GPIO_GPIO_MCP23017_H_
+
+#include <kernel.h>
+
+#include <drivers/gpio.h>
+#include <drivers/i2c.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Register definitions */
+#define REG_IODIR_PORTA 0x00
+#define REG_IODIR_PORTB 0x01
+#define REG_IPOL_PORTA 0x02
+#define REG_IPOL_PORTB 0x03
+#define REG_GPINTEN_PORTA 0x04
+#define REG_GPINTEN_PORTB 0x05
+#define REG_DEFVAL_PORTA 0x06
+#define REG_DEFVAL_PORTB 0x07
+#define REG_INTCON_PORTA 0x08
+#define REG_INTCON_PORTB 0x09
+#define REG_GPPU_PORTA 0x0C
+#define REG_GPPU_PORTB 0x0D
+#define REG_INTF_PORTA 0x0E
+#define REG_INTF_PORTB 0x0F
+#define REG_INTCAP_PORTA 0x10
+#define REG_INTCAP_PORTB 0x11
+#define REG_GPIO_PORTA 0x12
+#define REG_GPIO_PORTB 0x13
+#define REG_OLAT_PORTA 0x14
+#define REG_OLAT_PORTB 0x15
+
+#define MCP23017_ADDR 0x40
+#define MCP23017_READBIT 0x01
+
+/** Configuration data */
+struct mcp23017_config {
+    /* gpio_driver_data needs to be first */
+    struct gpio_driver_config common;
+
+    const char *const i2c_dev_name;
+    const uint16_t slave;
+};
+
+/** Runtime driver data */
+struct mcp23017_drv_data {
+    /* gpio_driver_data needs to be first */
+    struct gpio_driver_config data;
+
+    /** Master SPI device */
+    const struct device *i2c;
+
+    struct k_sem lock;
+
+    struct {
+        uint16_t iodir;
+        uint16_t ipol;
+        uint16_t gpinten;
+        uint16_t defval;
+        uint16_t intcon;
+        uint16_t iocon;
+        uint16_t gppu;
+        uint16_t intf;
+        uint16_t intcap;
+        uint16_t gpio;
+        uint16_t olat;
+    } reg_cache;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_DRIVERS_GPIO_GPIO_MCP23017_H_ */