83 строки
2.3 KiB
C
83 строки
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Simple MFD - I2C
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*
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* Author(s):
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* Michael Walle <michael@walle.cc>
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* Lee Jones <lee.jones@linaro.org>
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*
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* This driver creates a single register map with the intention for it to be
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* shared by all sub-devices. Children can use their parent's device structure
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* (dev.parent) in order to reference it.
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*
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* Once the register map has been successfully initialised, any sub-devices
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* represented by child nodes in Device Tree or via the MFD cells in this file
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* will be subsequently registered.
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*/
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/regmap.h>
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#include "simple-mfd-i2c.h"
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static const struct regmap_config regmap_config_8r_8v = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static int simple_mfd_i2c_probe(struct i2c_client *i2c)
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{
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const struct simple_mfd_data *simple_mfd_data;
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const struct regmap_config *regmap_config;
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struct regmap *regmap;
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int ret;
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simple_mfd_data = device_get_match_data(&i2c->dev);
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/* If no regmap_config is specified, use the default 8reg and 8val bits */
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if (!simple_mfd_data || !simple_mfd_data->regmap_config)
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regmap_config = ®map_config_8r_8v;
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else
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regmap_config = simple_mfd_data->regmap_config;
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regmap = devm_regmap_init_i2c(i2c, regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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/* If no MFD cells are spedified, use register the DT child nodes instead */
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if (!simple_mfd_data || !simple_mfd_data->mfd_cell)
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return devm_of_platform_populate(&i2c->dev);
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ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
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simple_mfd_data->mfd_cell,
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simple_mfd_data->mfd_cell_size,
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NULL, 0, NULL);
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if (ret)
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dev_err(&i2c->dev, "Failed to add child devices\n");
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return ret;
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}
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static const struct of_device_id simple_mfd_i2c_of_match[] = {
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{ .compatible = "kontron,sl28cpld" },
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{}
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};
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MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
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static struct i2c_driver simple_mfd_i2c_driver = {
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.probe_new = simple_mfd_i2c_probe,
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.driver = {
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.name = "simple-mfd-i2c",
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.of_match_table = simple_mfd_i2c_of_match,
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},
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};
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module_i2c_driver(simple_mfd_i2c_driver);
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MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
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MODULE_DESCRIPTION("Simple MFD - I2C driver");
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MODULE_LICENSE("GPL v2");
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