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143 lines
3.7 KiB
143 lines
3.7 KiB
/* |
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* HID over I2C Open Firmware Subclass |
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* |
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* Copyright (c) 2012 Benjamin Tissoires <[email protected]> |
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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 <[email protected]> |
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* Copyright (c) 2005 Michael Haboustak <[email protected]> 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/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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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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return i2c_hid_core_probe(client, &ihid_of->ops, |
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hid_descriptor_address); |
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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 <[email protected]>"); |
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MODULE_LICENSE("GPL");
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