drivers/base/regmap/regmap-i3c.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
   3
   4 #include <linux/regmap.h>
   5 #include <linux/i3c/device.h>
   6 #include <linux/i3c/master.h>
   7 #include <linux/module.h>
   8
   9 static int regmap_i3c_write(void *context, const void *data, size_t count)
  10 {
  11         struct device *dev = context;
  12         struct i3c_device *i3c = dev_to_i3cdev(dev);
  13         struct i3c_priv_xfer xfers[] = {
  14                 {
  15                         .rnw = false,
  16                         .len = count,
  17                         .data.out = data,
  18                 },
  19         };
  20
  21         return i3c_device_do_priv_xfers(i3c, xfers, 1);
  22 }
  23
  24 static int regmap_i3c_read(void *context,
  25                            const void *reg, size_t reg_size,
  26                            void *val, size_t val_size)
  27 {
  28         struct device *dev = context;
  29         struct i3c_device *i3c = dev_to_i3cdev(dev);
  30         struct i3c_priv_xfer xfers[2];
  31
  32         xfers[0].rnw = false;
  33         xfers[0].len = reg_size;
  34         xfers[0].data.out = reg;
  35
  36         xfers[1].rnw = true;
  37         xfers[1].len = val_size;
  38         xfers[1].data.in = val;
  39
  40         return i3c_device_do_priv_xfers(i3c, xfers, 2);
  41 }
  42
  43 static struct regmap_bus regmap_i3c = {
  44         .write = regmap_i3c_write,
  45         .read = regmap_i3c_read,
  46 };
  47
  48 struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
  49                                       const struct regmap_config *config,
  50                                       struct lock_class_key *lock_key,
  51                                       const char *lock_name)
  52 {
  53         return __devm_regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
  54                                   lock_key, lock_name);
  55 }
  56 EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);
  57
  58 MODULE_AUTHOR("Vitor Soares <vitor.soares@synopsys.com>");
  59 MODULE_DESCRIPTION("Regmap I3C Module");
  60 MODULE_LICENSE("GPL v2");