drivers/i2c/cros_ec_tunnel.c

   1 /*
   2  * Copyright (c) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <dm.h>
  10 #include <cros_ec.h>
  11 #include <errno.h>
  12 #include <i2c.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 struct cros_ec_i2c_bus {
  17         int remote_bus;
  18 };
  19
  20 static int cros_ec_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
  21 {
  22         return 0;
  23 }
  24
  25 static int cros_ec_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
  26                             int nmsgs)
  27 {
  28         struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
  29
  30         return cros_ec_i2c_tunnel(dev->parent, i2c_bus->remote_bus, msg, nmsgs);
  31 }
  32
  33 static int cros_ec_i2c_ofdata_to_platdata(struct udevice *dev)
  34 {
  35         struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
  36         const void *blob = gd->fdt_blob;
  37         int node = dev_of_offset(dev);
  38
  39         i2c_bus->remote_bus = fdtdec_get_uint(blob, node, "google,remote-bus",
  40                                               0);
  41
  42         return 0;
  43 }
  44
  45 static const struct dm_i2c_ops cros_ec_i2c_ops = {
  46         .xfer           = cros_ec_i2c_xfer,
  47         .set_bus_speed  = cros_ec_i2c_set_bus_speed,
  48 };
  49
  50 static const struct udevice_id cros_ec_i2c_ids[] = {
  51         { .compatible = "google,cros-ec-i2c-tunnel" },
  52         { }
  53 };
  54
  55 U_BOOT_DRIVER(cros_ec_tunnel) = {
  56         .name   = "cros_ec_tunnel",
  57         .id     = UCLASS_I2C,
  58         .of_match = cros_ec_i2c_ids,
  59         .ofdata_to_platdata = cros_ec_i2c_ofdata_to_platdata,
  60         .priv_auto_alloc_size = sizeof(struct cros_ec_i2c_bus),
  61         .ops    = &cros_ec_i2c_ops,
  62 };