drivers/i2c/cros_ec_tunnel.c

   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
  13 DECLARE_GLOBAL_DATA_PTR;
  14
  15 struct cros_ec_i2c_bus {
  16         int remote_bus;
  17 };
  18
  19 static int cros_ec_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
  20 {
  21         return 0;
  22 }
  23
  24 static int cros_ec_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
  25                             int nmsgs)
  26 {
  27         struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
  28
  29         return cros_ec_i2c_tunnel(dev->parent, i2c_bus->remote_bus, msg, nmsgs);
  30 }
  31
  32 static int cros_ec_i2c_ofdata_to_platdata(struct udevice *dev)
  33 {
  34         struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
  35         const void *blob = gd->fdt_blob;
  36         int node = dev_of_offset(dev);
  37
  38         i2c_bus->remote_bus = fdtdec_get_uint(blob, node, "google,remote-bus",
  39                                               0);
  40
  41         return 0;
  42 }
  43
  44 static const struct dm_i2c_ops cros_ec_i2c_ops = {
  45         .xfer           = cros_ec_i2c_xfer,
  46         .set_bus_speed  = cros_ec_i2c_set_bus_speed,
  47 };
  48
  49 static const struct udevice_id cros_ec_i2c_ids[] = {
  50         { .compatible = "google,cros-ec-i2c-tunnel" },
  51         { }
  52 };
  53
  54 U_BOOT_DRIVER(cros_ec_tunnel) = {
  55         .name   = "cros_ec_tunnel",
  56         .id     = UCLASS_I2C,
  57         .of_match = cros_ec_i2c_ids,
  58         .ofdata_to_platdata = cros_ec_i2c_ofdata_to_platdata,
  59         .priv_auto_alloc_size = sizeof(struct cros_ec_i2c_bus),
  60         .ops    = &cros_ec_i2c_ops,
  61 };