1*f48eaf01SSimon Glass /*
2*f48eaf01SSimon Glass * Copyright (c) 2015 Google, Inc
3*f48eaf01SSimon Glass * Written by Simon Glass <sjg@chromium.org>
4*f48eaf01SSimon Glass *
5*f48eaf01SSimon Glass * SPDX-License-Identifier: GPL-2.0+
6*f48eaf01SSimon Glass */
7*f48eaf01SSimon Glass
8*f48eaf01SSimon Glass #include <common.h>
9*f48eaf01SSimon Glass #include <dm.h>
10*f48eaf01SSimon Glass #include <cros_ec.h>
11*f48eaf01SSimon Glass #include <errno.h>
12*f48eaf01SSimon Glass #include <i2c.h>
13*f48eaf01SSimon Glass #include <power/tps65090.h>
14*f48eaf01SSimon Glass
cros_ec_ldo_set_bus_speed(struct udevice * dev,unsigned int speed)15*f48eaf01SSimon Glass static int cros_ec_ldo_set_bus_speed(struct udevice *dev, unsigned int speed)
16*f48eaf01SSimon Glass {
17*f48eaf01SSimon Glass return 0;
18*f48eaf01SSimon Glass }
19*f48eaf01SSimon Glass
cros_ec_ldo_xfer(struct udevice * dev,struct i2c_msg * msg,int nmsgs)20*f48eaf01SSimon Glass static int cros_ec_ldo_xfer(struct udevice *dev, struct i2c_msg *msg,
21*f48eaf01SSimon Glass int nmsgs)
22*f48eaf01SSimon Glass {
23*f48eaf01SSimon Glass bool is_read = nmsgs > 1;
24*f48eaf01SSimon Glass int fet_id, ret;
25*f48eaf01SSimon Glass
26*f48eaf01SSimon Glass /*
27*f48eaf01SSimon Glass * Look for reads and writes of the LDO registers. In either case the
28*f48eaf01SSimon Glass * first message is a write with the register number as the first byte.
29*f48eaf01SSimon Glass */
30*f48eaf01SSimon Glass if (!nmsgs || !msg->len || (msg->flags & I2C_M_RD)) {
31*f48eaf01SSimon Glass debug("%s: Invalid message\n", __func__);
32*f48eaf01SSimon Glass goto err;
33*f48eaf01SSimon Glass }
34*f48eaf01SSimon Glass
35*f48eaf01SSimon Glass fet_id = msg->buf[0] - REG_FET_BASE;
36*f48eaf01SSimon Glass if (fet_id < 1 || fet_id > MAX_FET_NUM) {
37*f48eaf01SSimon Glass debug("%s: Invalid FET %d\n", __func__, fet_id);
38*f48eaf01SSimon Glass goto err;
39*f48eaf01SSimon Glass }
40*f48eaf01SSimon Glass
41*f48eaf01SSimon Glass if (is_read) {
42*f48eaf01SSimon Glass uint8_t state;
43*f48eaf01SSimon Glass
44*f48eaf01SSimon Glass ret = cros_ec_get_ldo(dev->parent, fet_id, &state);
45*f48eaf01SSimon Glass if (!ret)
46*f48eaf01SSimon Glass msg[1].buf[0] = state ?
47*f48eaf01SSimon Glass FET_CTRL_ENFET | FET_CTRL_PGFET : 0;
48*f48eaf01SSimon Glass } else {
49*f48eaf01SSimon Glass bool on = msg->buf[1] & FET_CTRL_ENFET;
50*f48eaf01SSimon Glass
51*f48eaf01SSimon Glass ret = cros_ec_set_ldo(dev->parent, fet_id, on);
52*f48eaf01SSimon Glass }
53*f48eaf01SSimon Glass
54*f48eaf01SSimon Glass return ret;
55*f48eaf01SSimon Glass
56*f48eaf01SSimon Glass err:
57*f48eaf01SSimon Glass /* Indicate that the message is unimplemented */
58*f48eaf01SSimon Glass return -ENOSYS;
59*f48eaf01SSimon Glass }
60*f48eaf01SSimon Glass
61*f48eaf01SSimon Glass static const struct dm_i2c_ops cros_ec_i2c_ops = {
62*f48eaf01SSimon Glass .xfer = cros_ec_ldo_xfer,
63*f48eaf01SSimon Glass .set_bus_speed = cros_ec_ldo_set_bus_speed,
64*f48eaf01SSimon Glass };
65*f48eaf01SSimon Glass
66*f48eaf01SSimon Glass static const struct udevice_id cros_ec_i2c_ids[] = {
67*f48eaf01SSimon Glass { .compatible = "google,cros-ec-ldo-tunnel" },
68*f48eaf01SSimon Glass { }
69*f48eaf01SSimon Glass };
70*f48eaf01SSimon Glass
71*f48eaf01SSimon Glass U_BOOT_DRIVER(cros_ec_ldo) = {
72*f48eaf01SSimon Glass .name = "cros_ec_ldo_tunnel",
73*f48eaf01SSimon Glass .id = UCLASS_I2C,
74*f48eaf01SSimon Glass .of_match = cros_ec_i2c_ids,
75*f48eaf01SSimon Glass .ops = &cros_ec_i2c_ops,
76*f48eaf01SSimon Glass };
77