blob: 501e602b278c61be714dc241b6b3d685d3a166ff [file] [log] [blame]
Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Simon Glassf48eaf02015-08-03 08:19:24 -06002/*
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
Simon Glassf48eaf02015-08-03 08:19:24 -06005 */
6
7#include <common.h>
8#include <dm.h>
9#include <cros_ec.h>
10#include <errno.h>
11#include <i2c.h>
12#include <power/tps65090.h>
13
14static int cros_ec_ldo_set_bus_speed(struct udevice *dev, unsigned int speed)
15{
16 return 0;
17}
18
19static int cros_ec_ldo_xfer(struct udevice *dev, struct i2c_msg *msg,
20 int nmsgs)
21{
22 bool is_read = nmsgs > 1;
23 int fet_id, ret;
24
25 /*
26 * Look for reads and writes of the LDO registers. In either case the
27 * first message is a write with the register number as the first byte.
28 */
29 if (!nmsgs || !msg->len || (msg->flags & I2C_M_RD)) {
30 debug("%s: Invalid message\n", __func__);
31 goto err;
32 }
33
34 fet_id = msg->buf[0] - REG_FET_BASE;
35 if (fet_id < 1 || fet_id > MAX_FET_NUM) {
36 debug("%s: Invalid FET %d\n", __func__, fet_id);
37 goto err;
38 }
39
40 if (is_read) {
41 uint8_t state;
42
43 ret = cros_ec_get_ldo(dev->parent, fet_id, &state);
44 if (!ret)
45 msg[1].buf[0] = state ?
46 FET_CTRL_ENFET | FET_CTRL_PGFET : 0;
47 } else {
48 bool on = msg->buf[1] & FET_CTRL_ENFET;
49
50 ret = cros_ec_set_ldo(dev->parent, fet_id, on);
51 }
52
53 return ret;
54
55err:
56 /* Indicate that the message is unimplemented */
57 return -ENOSYS;
58}
59
60static const struct dm_i2c_ops cros_ec_i2c_ops = {
61 .xfer = cros_ec_ldo_xfer,
62 .set_bus_speed = cros_ec_ldo_set_bus_speed,
63};
64
65static const struct udevice_id cros_ec_i2c_ids[] = {
66 { .compatible = "google,cros-ec-ldo-tunnel" },
67 { }
68};
69
70U_BOOT_DRIVER(cros_ec_ldo) = {
71 .name = "cros_ec_ldo_tunnel",
72 .id = UCLASS_I2C,
73 .of_match = cros_ec_i2c_ids,
Simon Glassf48eaf02015-08-03 08:19:24 -060074 .ops = &cros_ec_i2c_ops,
75};