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6445500b43
Add basic support for i3c bus. This is a simple implementation that only give support for SDR Read and Write commands. Signed-off-by: Vitor Soares <vitor.soares@synopsys.com> Signed-off-by: Mark Brown <broonie@kernel.org>
61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.
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#include <linux/regmap.h>
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#include <linux/i3c/device.h>
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#include <linux/i3c/master.h>
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#include <linux/module.h>
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static int regmap_i3c_write(void *context, const void *data, size_t count)
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{
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struct device *dev = context;
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struct i3c_device *i3c = dev_to_i3cdev(dev);
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struct i3c_priv_xfer xfers[] = {
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{
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.rnw = false,
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.len = count,
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.data.out = data,
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},
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};
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return i3c_device_do_priv_xfers(i3c, xfers, 1);
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}
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static int regmap_i3c_read(void *context,
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const void *reg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct device *dev = context;
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struct i3c_device *i3c = dev_to_i3cdev(dev);
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struct i3c_priv_xfer xfers[2];
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xfers[0].rnw = false;
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xfers[0].len = reg_size;
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xfers[0].data.out = reg;
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xfers[1].rnw = true;
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xfers[1].len = val_size;
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xfers[1].data.in = val;
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return i3c_device_do_priv_xfers(i3c, xfers, 2);
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}
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static struct regmap_bus regmap_i3c = {
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.write = regmap_i3c_write,
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.read = regmap_i3c_read,
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};
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struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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return __devm_regmap_init(&i3c->dev, ®map_i3c, &i3c->dev, config,
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lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);
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MODULE_AUTHOR("Vitor Soares <vitor.soares@synopsys.com>");
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MODULE_DESCRIPTION("Regmap I3C Module");
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MODULE_LICENSE("GPL v2");
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