LXR uboot/drivers/i2c/cros_ec

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Copyright (c) 2015 Google, Inc
   4 * Written by Simon Glass <sjg@chromium.org>
   5 */
   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,
  74        .ops    = &cros_ec_i2c_ops,
  75};
  76