77 lines
1.6 KiB
C
77 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <cros_ec.h>
|
|
#include <errno.h>
|
|
#include <i2c.h>
|
|
#include <log.h>
|
|
#include <power/tps65090.h>
|
|
|
|
static int cros_ec_ldo_set_bus_speed(struct udevice *dev, unsigned int speed)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int cros_ec_ldo_xfer(struct udevice *dev, struct i2c_msg *msg,
|
|
int nmsgs)
|
|
{
|
|
bool is_read = nmsgs > 1;
|
|
int fet_id, ret;
|
|
|
|
/*
|
|
* Look for reads and writes of the LDO registers. In either case the
|
|
* first message is a write with the register number as the first byte.
|
|
*/
|
|
if (!nmsgs || !msg->len || (msg->flags & I2C_M_RD)) {
|
|
debug("%s: Invalid message\n", __func__);
|
|
goto err;
|
|
}
|
|
|
|
fet_id = msg->buf[0] - REG_FET_BASE;
|
|
if (fet_id < 1 || fet_id > MAX_FET_NUM) {
|
|
debug("%s: Invalid FET %d\n", __func__, fet_id);
|
|
goto err;
|
|
}
|
|
|
|
if (is_read) {
|
|
uint8_t state;
|
|
|
|
ret = cros_ec_get_ldo(dev->parent, fet_id, &state);
|
|
if (!ret)
|
|
msg[1].buf[0] = state ?
|
|
FET_CTRL_ENFET | FET_CTRL_PGFET : 0;
|
|
} else {
|
|
bool on = msg->buf[1] & FET_CTRL_ENFET;
|
|
|
|
ret = cros_ec_set_ldo(dev->parent, fet_id, on);
|
|
}
|
|
|
|
return ret;
|
|
|
|
err:
|
|
/* Indicate that the message is unimplemented */
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static const struct dm_i2c_ops cros_ec_i2c_ops = {
|
|
.xfer = cros_ec_ldo_xfer,
|
|
.set_bus_speed = cros_ec_ldo_set_bus_speed,
|
|
};
|
|
|
|
static const struct udevice_id cros_ec_i2c_ids[] = {
|
|
{ .compatible = "google,cros-ec-ldo-tunnel" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(cros_ec_ldo) = {
|
|
.name = "cros_ec_ldo_tunnel",
|
|
.id = UCLASS_I2C,
|
|
.of_match = cros_ec_i2c_ids,
|
|
.ops = &cros_ec_i2c_ops,
|
|
};
|