1 /* 2 * This program is free software; you can redistribute it and/or modify 3 * it under the terms of the GNU General Public License version 2 as 4 * published by the Free Software Foundation. 5 * 6 * h3600 atmel micro companion support, key subdevice 7 * based on previous kernel 2.4 version 8 * Author : Alessandro Gardich <gremlin@gremlin.it> 9 * Author : Linus Walleij <linus.walleij@linaro.org> 10 * 11 */ 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/fs.h> 15 #include <linux/interrupt.h> 16 #include <linux/sched.h> 17 #include <linux/pm.h> 18 #include <linux/sysctl.h> 19 #include <linux/proc_fs.h> 20 #include <linux/delay.h> 21 #include <linux/device.h> 22 #include <linux/input.h> 23 #include <linux/platform_device.h> 24 #include <linux/mfd/ipaq-micro.h> 25 26 struct ipaq_micro_keys { 27 struct ipaq_micro *micro; 28 struct input_dev *input; 29 u16 *codes; 30 }; 31 32 static const u16 micro_keycodes[] = { 33 KEY_RECORD, /* 1: Record button */ 34 KEY_CALENDAR, /* 2: Calendar */ 35 KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */ 36 KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */ 37 KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */ 38 KEY_UP, /* 6: Up */ 39 KEY_RIGHT, /* 7: Right */ 40 KEY_LEFT, /* 8: Left */ 41 KEY_DOWN, /* 9: Down */ 42 }; 43 44 static void micro_key_receive(void *data, int len, unsigned char *msg) 45 { 46 struct ipaq_micro_keys *keys = data; 47 int key, down; 48 49 down = 0x80 & msg[0]; 50 key = 0x7f & msg[0]; 51 52 if (key < ARRAY_SIZE(micro_keycodes)) { 53 input_report_key(keys->input, keys->codes[key], down); 54 input_sync(keys->input); 55 } 56 } 57 58 static void micro_key_start(struct ipaq_micro_keys *keys) 59 { 60 spin_lock(&keys->micro->lock); 61 keys->micro->key = micro_key_receive; 62 keys->micro->key_data = keys; 63 spin_unlock(&keys->micro->lock); 64 } 65 66 static void micro_key_stop(struct ipaq_micro_keys *keys) 67 { 68 spin_lock(&keys->micro->lock); 69 keys->micro->key = NULL; 70 keys->micro->key_data = NULL; 71 spin_unlock(&keys->micro->lock); 72 } 73 74 static int micro_key_open(struct input_dev *input) 75 { 76 struct ipaq_micro_keys *keys = input_get_drvdata(input); 77 78 micro_key_start(keys); 79 80 return 0; 81 } 82 83 static void micro_key_close(struct input_dev *input) 84 { 85 struct ipaq_micro_keys *keys = input_get_drvdata(input); 86 87 micro_key_stop(keys); 88 } 89 90 static int micro_key_probe(struct platform_device *pdev) 91 { 92 struct ipaq_micro_keys *keys; 93 int error; 94 int i; 95 96 keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL); 97 if (!keys) 98 return -ENOMEM; 99 100 keys->micro = dev_get_drvdata(pdev->dev.parent); 101 102 keys->input = devm_input_allocate_device(&pdev->dev); 103 if (!keys->input) 104 return -ENOMEM; 105 106 keys->input->keycodesize = sizeof(micro_keycodes[0]); 107 keys->input->keycodemax = ARRAY_SIZE(micro_keycodes); 108 keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes, 109 keys->input->keycodesize * keys->input->keycodemax, 110 GFP_KERNEL); 111 keys->input->keycode = keys->codes; 112 113 __set_bit(EV_KEY, keys->input->evbit); 114 for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++) 115 __set_bit(micro_keycodes[i], keys->input->keybit); 116 117 keys->input->name = "h3600 micro keys"; 118 keys->input->open = micro_key_open; 119 keys->input->close = micro_key_close; 120 input_set_drvdata(keys->input, keys); 121 122 error = input_register_device(keys->input); 123 if (error) 124 return error; 125 126 platform_set_drvdata(pdev, keys); 127 return 0; 128 } 129 130 static int __maybe_unused micro_key_suspend(struct device *dev) 131 { 132 struct ipaq_micro_keys *keys = dev_get_drvdata(dev); 133 134 micro_key_stop(keys); 135 136 return 0; 137 } 138 139 static int __maybe_unused micro_key_resume(struct device *dev) 140 { 141 struct ipaq_micro_keys *keys = dev_get_drvdata(dev); 142 struct input_dev *input = keys->input; 143 144 mutex_lock(&input->mutex); 145 146 if (input->users) 147 micro_key_start(keys); 148 149 mutex_unlock(&input->mutex); 150 151 return 0; 152 } 153 154 static SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops, 155 micro_key_suspend, micro_key_resume); 156 157 static struct platform_driver micro_key_device_driver = { 158 .driver = { 159 .name = "ipaq-micro-keys", 160 .pm = µ_key_dev_pm_ops, 161 }, 162 .probe = micro_key_probe, 163 }; 164 module_platform_driver(micro_key_device_driver); 165 166 MODULE_LICENSE("GPL"); 167 MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys"); 168 MODULE_ALIAS("platform:ipaq-micro-keys"); 169