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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "atomic.h"
#include "common.h"
#include "console.h"
#include "ec_commands.h"
#include "endian.h"
#include "gpio.h"
#include "mkbp_event.h"
#include "spi.h"
#include "task.h"
#include "timer.h"
#include "util.h"
#define CPRINTF(format, args...) cprintf(CC_FP, format, ## args)
#define CPRINTS(format, args...) cprints(CC_FP, format, ## args)
/* Sensor IC commands */
enum fpc_cmd {
FPC_CMD_STATUS = 0x14,
FPC_CMD_INT_STS = 0x18,
FPC_CMD_INT_CLR = 0x1C,
FPC_CMD_FINGER_QUERY = 0x20,
FPC_CMD_SLEEP = 0x28,
FPC_CMD_SOFT_RESET = 0xF8,
FPC_CMD_HW_ID = 0xFC,
};
#define FPC_INT_FINGER_DOWN (1 << 0)
#ifndef SPI_FPC_DEVICE
#define SPI_FPC_DEVICE (&spi_devices[0])
#endif
static uint32_t fp_events;
static int fpc_send_cmd(const uint8_t cmd)
{
return spi_transaction(SPI_FPC_DEVICE, &cmd, 1, NULL, 0);
}
static int fpc_check_hwid(void)
{
const uint8_t cmd = FPC_CMD_HW_ID;
uint16_t id;
int rc;
rc = spi_transaction(SPI_FPC_DEVICE, &cmd, 1, (void *)&id, sizeof(id));
if (rc) {
CPRINTS("FPC ID read failed %d", rc);
return rc;
}
id = be16toh(id);
if ((id >> 4) != 0x140) {
CPRINTS("FPC unknown silicon 0x%04x", id);
return EC_ERROR_INVAL;
}
CPRINTS("FPC1140 id 0x%04x", id);
return EC_SUCCESS;
}
static uint8_t fpc_read_clear_int(void)
{
const uint8_t cmd = FPC_CMD_INT_CLR;
uint8_t val = 0xff;
if (spi_transaction(SPI_FPC_DEVICE, &cmd, 1, &val, 1))
return 0xff;
return val;
}
static uint8_t fpc_read_int(void)
{
const uint8_t cmd = FPC_CMD_INT_STS;
uint8_t val = 0xff;
if (spi_transaction(SPI_FPC_DEVICE, &cmd, 1, &val, 1))
return 0xff;
return val;
}
/* Reset and initialize the sensor IC */
static int fpc_init(void)
{
/* configure the SPI controller (also ensure that CS_N is high) */
gpio_config_module(MODULE_SPI_MASTER, 1);
spi_enable(CONFIG_SPI_FP_PORT, 1);
/* Ensure we pulse reset low to initiate the startup */
gpio_set_level(GPIO_FP_RST_ODL, 0);
usleep(100);
gpio_set_level(GPIO_FP_RST_ODL, 1);
/* the IRQ line should be set high by the sensor */
usleep(10000);
if (!gpio_get_level(GPIO_FPS_INT)) {
CPRINTS("FPC not ready");
return EC_ERROR_TIMEOUT;
}
/* Check the Hardware ID */
if (fpc_check_hwid())
return EC_ERROR_INVAL;
/* clear the pending 'ready' IRQ before enabling interrupts */
fpc_read_clear_int();
gpio_enable_interrupt(GPIO_FPS_INT);
fpc_send_cmd(FPC_CMD_SLEEP);
return EC_SUCCESS;
}
/* Interrupt line from the fingerprint sensor */
void fps_event(enum gpio_signal signal)
{
task_wake(TASK_ID_FPC1140);
}
void fp_task(void)
{
fpc_init();
while (1) {
uint8_t evt;
task_wait_event(-1);
evt = fpc_read_int();
atomic_or(&fp_events, evt);
CPRINTS("FPS event %02x", evt);
if (evt & FPC_INT_FINGER_DOWN)
CPRINTS("Finger!");
if (evt)
mkbp_send_event(EC_MKBP_EVENT_FINGERPRINT);
}
}
static int fp_get_next_event(uint8_t *out)
{
uint32_t event_out = atomic_read_clear(&fp_events);
memcpy(out, &event_out, sizeof(event_out));
return sizeof(event_out);
}
DECLARE_EVENT_SOURCE(EC_MKBP_EVENT_FINGERPRINT, fp_get_next_event);
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