152 lines
3.9 KiB
C
152 lines
3.9 KiB
C
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/*
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* HID over I2C Open Firmware Subclass
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*
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* Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
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* Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
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* Copyright (c) 2012 Red Hat, Inc
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*
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* This code was forked out of the core code, which was partly based on
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* "USB HID support for Linux":
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*
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* Copyright (c) 1999 Andreas Gal
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* Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
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* Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
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* Copyright (c) 2007-2008 Oliver Neukum
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* Copyright (c) 2006-2010 Jiri Kosina
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/i2c.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/pm.h>
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#include <linux/regulator/consumer.h>
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#include "i2c-hid.h"
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struct i2c_hid_of {
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struct i2chid_ops ops;
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struct i2c_client *client;
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struct regulator_bulk_data supplies[2];
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int post_power_delay_ms;
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};
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static int i2c_hid_of_power_up(struct i2chid_ops *ops)
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{
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struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
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struct device *dev = &ihid_of->client->dev;
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int ret;
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ret = regulator_bulk_enable(ARRAY_SIZE(ihid_of->supplies),
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ihid_of->supplies);
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if (ret) {
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dev_warn(dev, "Failed to enable supplies: %d\n", ret);
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return ret;
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}
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if (ihid_of->post_power_delay_ms)
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msleep(ihid_of->post_power_delay_ms);
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return 0;
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}
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static void i2c_hid_of_power_down(struct i2chid_ops *ops)
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{
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struct i2c_hid_of *ihid_of = container_of(ops, struct i2c_hid_of, ops);
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regulator_bulk_disable(ARRAY_SIZE(ihid_of->supplies),
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ihid_of->supplies);
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}
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static int i2c_hid_of_probe(struct i2c_client *client,
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const struct i2c_device_id *dev_id)
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{
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struct device *dev = &client->dev;
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struct i2c_hid_of *ihid_of;
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u16 hid_descriptor_address;
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u32 quirks = 0;
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int ret;
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u32 val;
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ihid_of = devm_kzalloc(&client->dev, sizeof(*ihid_of), GFP_KERNEL);
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if (!ihid_of)
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return -ENOMEM;
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ihid_of->ops.power_up = i2c_hid_of_power_up;
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ihid_of->ops.power_down = i2c_hid_of_power_down;
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ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
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if (ret) {
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dev_err(&client->dev, "HID register address not provided\n");
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return -ENODEV;
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}
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if (val >> 16) {
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dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
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val);
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return -EINVAL;
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}
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hid_descriptor_address = val;
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if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
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&val))
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ihid_of->post_power_delay_ms = val;
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ihid_of->supplies[0].supply = "vdd";
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ihid_of->supplies[1].supply = "vddl";
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ret = devm_regulator_bulk_get(&client->dev,
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ARRAY_SIZE(ihid_of->supplies),
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ihid_of->supplies);
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if (ret)
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return ret;
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if (device_property_read_bool(dev, "touchscreen-inverted-x"))
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quirks |= HID_QUIRK_X_INVERT;
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if (device_property_read_bool(dev, "touchscreen-inverted-y"))
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quirks |= HID_QUIRK_Y_INVERT;
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return i2c_hid_core_probe(client, &ihid_of->ops,
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hid_descriptor_address, quirks);
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}
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static const struct of_device_id i2c_hid_of_match[] = {
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{ .compatible = "hid-over-i2c" },
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{},
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};
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MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
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static const struct i2c_device_id i2c_hid_of_id_table[] = {
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{ "hid", 0 },
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{ "hid-over-i2c", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(i2c, i2c_hid_of_id_table);
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static struct i2c_driver i2c_hid_of_driver = {
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.driver = {
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.name = "i2c_hid_of",
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.pm = &i2c_hid_core_pm,
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.probe_type = PROBE_PREFER_ASYNCHRONOUS,
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.of_match_table = of_match_ptr(i2c_hid_of_match),
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},
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.probe = i2c_hid_of_probe,
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.remove = i2c_hid_core_remove,
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.shutdown = i2c_hid_core_shutdown,
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.id_table = i2c_hid_of_id_table,
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};
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module_i2c_driver(i2c_hid_of_driver);
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MODULE_DESCRIPTION("HID over I2C OF driver");
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MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
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MODULE_LICENSE("GPL");
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