input/keyboard/ipaq-micro-keys.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *
0004  * h3600 atmel micro companion support, key subdevice
0005  * based on previous kernel 2.4 version
0006  * Author : Alessandro Gardich <gremlin@gremlin.it>
0007  * Author : Linus Walleij <linus.walleij@linaro.org>
0008  */
0009 #include <linux/module.h>
0010 #include <linux/init.h>
0011 #include <linux/fs.h>
0012 #include <linux/interrupt.h>
0013 #include <linux/sched.h>
0014 #include <linux/pm.h>
0015 #include <linux/sysctl.h>
0016 #include <linux/proc_fs.h>
0017 #include <linux/delay.h>
0018 #include <linux/device.h>
0019 #include <linux/input.h>
0020 #include <linux/platform_device.h>
0021 #include <linux/mfd/ipaq-micro.h>
0022
0023 struct ipaq_micro_keys {
0024     struct ipaq_micro *micro;
0025     struct input_dev *input;
0026     u16 *codes;
0027 };
0028
0029 static const u16 micro_keycodes[] = {
0030     KEY_RECORD,     /* 1:  Record button            */
0031     KEY_CALENDAR,       /* 2:  Calendar             */
0032     KEY_ADDRESSBOOK,    /* 3:  Contacts (looks like Outlook)    */
0033     KEY_MAIL,       /* 4:  Envelope (Q on older iPAQs)  */
0034     KEY_HOMEPAGE,       /* 5:  Start (looks like swoopy arrow)  */
0035     KEY_UP,         /* 6:  Up               */
0036     KEY_RIGHT,      /* 7:  Right                */
0037     KEY_LEFT,       /* 8:  Left             */
0038     KEY_DOWN,       /* 9:  Down             */
0039 };
0040
0041 static void micro_key_receive(void *data, int len, unsigned char *msg)
0042 {
0043     struct ipaq_micro_keys *keys = data;
0044     int key, down;
0045
0046     down = 0x80 & msg[0];
0047     key  = 0x7f & msg[0];
0048
0049     if (key < ARRAY_SIZE(micro_keycodes)) {
0050         input_report_key(keys->input, keys->codes[key], down);
0051         input_sync(keys->input);
0052     }
0053 }
0054
0055 static void micro_key_start(struct ipaq_micro_keys *keys)
0056 {
0057     spin_lock(&keys->micro->lock);
0058     keys->micro->key = micro_key_receive;
0059     keys->micro->key_data = keys;
0060     spin_unlock(&keys->micro->lock);
0061 }
0062
0063 static void micro_key_stop(struct ipaq_micro_keys *keys)
0064 {
0065     spin_lock(&keys->micro->lock);
0066     keys->micro->key = NULL;
0067     keys->micro->key_data = NULL;
0068     spin_unlock(&keys->micro->lock);
0069 }
0070
0071 static int micro_key_open(struct input_dev *input)
0072 {
0073     struct ipaq_micro_keys *keys = input_get_drvdata(input);
0074
0075     micro_key_start(keys);
0076
0077     return 0;
0078 }
0079
0080 static void micro_key_close(struct input_dev *input)
0081 {
0082     struct ipaq_micro_keys *keys = input_get_drvdata(input);
0083
0084     micro_key_stop(keys);
0085 }
0086
0087 static int micro_key_probe(struct platform_device *pdev)
0088 {
0089     struct ipaq_micro_keys *keys;
0090     int error;
0091     int i;
0092
0093     keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL);
0094     if (!keys)
0095         return -ENOMEM;
0096
0097     keys->micro = dev_get_drvdata(pdev->dev.parent);
0098
0099     keys->input = devm_input_allocate_device(&pdev->dev);
0100     if (!keys->input)
0101         return -ENOMEM;
0102
0103     keys->input->keycodesize = sizeof(micro_keycodes[0]);
0104     keys->input->keycodemax = ARRAY_SIZE(micro_keycodes);
0105     keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes,
0106                keys->input->keycodesize * keys->input->keycodemax,
0107                GFP_KERNEL);
0108     keys->input->keycode = keys->codes;
0109
0110     __set_bit(EV_KEY, keys->input->evbit);
0111     for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++)
0112         __set_bit(micro_keycodes[i], keys->input->keybit);
0113
0114     keys->input->name = "h3600 micro keys";
0115     keys->input->open = micro_key_open;
0116     keys->input->close = micro_key_close;
0117     input_set_drvdata(keys->input, keys);
0118
0119     error = input_register_device(keys->input);
0120     if (error)
0121         return error;
0122
0123     platform_set_drvdata(pdev, keys);
0124     return 0;
0125 }
0126
0127 static int __maybe_unused micro_key_suspend(struct device *dev)
0128 {
0129     struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
0130
0131     micro_key_stop(keys);
0132
0133     return 0;
0134 }
0135
0136 static int __maybe_unused micro_key_resume(struct device *dev)
0137 {
0138     struct ipaq_micro_keys *keys = dev_get_drvdata(dev);
0139     struct input_dev *input = keys->input;
0140
0141     mutex_lock(&input->mutex);
0142
0143     if (input_device_enabled(input))
0144         micro_key_start(keys);
0145
0146     mutex_unlock(&input->mutex);
0147
0148     return 0;
0149 }
0150
0151 static SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops,
0152              micro_key_suspend, micro_key_resume);
0153
0154 static struct platform_driver micro_key_device_driver = {
0155     .driver = {
0156         .name    = "ipaq-micro-keys",
0157         .pm = &micro_key_dev_pm_ops,
0158     },
0159     .probe   = micro_key_probe,
0160 };
0161 module_platform_driver(micro_key_device_driver);
0162
0163 MODULE_LICENSE("GPL");
0164 MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys");
0165 MODULE_ALIAS("platform:ipaq-micro-keys");