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