1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 4 * h3600 atmel micro companion support, key subdevice 5 * based on previous kernel 2.4 version 6 * Author : Alessandro Gardich <gremlin@gremlin.it> 7 * Author : Linus Walleij <linus.walleij@linaro.org> 8 */ 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/fs.h> 12 #include <linux/interrupt.h> 13 #include <linux/sched.h> 14 #include <linux/pm.h> 15 #include <linux/sysctl.h> 16 #include <linux/proc_fs.h> 17 #include <linux/delay.h> 18 #include <linux/device.h> 19 #include <linux/input.h> 20 #include <linux/platform_device.h> 21 #include <linux/mfd/ipaq-micro.h> 22 23 struct ipaq_micro_keys { 24 struct ipaq_micro *micro; 25 struct input_dev *input; 26 u16 *codes; 27 }; 28 29 static const u16 micro_keycodes[] = { 30 KEY_RECORD, /* 1: Record button */ 31 KEY_CALENDAR, /* 2: Calendar */ 32 KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */ 33 KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */ 34 KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */ 35 KEY_UP, /* 6: Up */ 36 KEY_RIGHT, /* 7: Right */ 37 KEY_LEFT, /* 8: Left */ 38 KEY_DOWN, /* 9: Down */ 39 }; 40 41 static void micro_key_receive(void *data, int len, unsigned char *msg) 42 { 43 struct ipaq_micro_keys *keys = data; 44 int key, down; 45 46 down = 0x80 & msg[0]; 47 key = 0x7f & msg[0]; 48 49 if (key < ARRAY_SIZE(micro_keycodes)) { 50 input_report_key(keys->input, keys->codes[key], down); 51 input_sync(keys->input); 52 } 53 } 54 55 static void micro_key_start(struct ipaq_micro_keys *keys) 56 { 57 spin_lock(&keys->micro->lock); 58 keys->micro->key = micro_key_receive; 59 keys->micro->key_data = keys; 60 spin_unlock(&keys->micro->lock); 61 } 62 63 static void micro_key_stop(struct ipaq_micro_keys *keys) 64 { 65 spin_lock(&keys->micro->lock); 66 keys->micro->key = NULL; 67 keys->micro->key_data = NULL; 68 spin_unlock(&keys->micro->lock); 69 } 70 71 static int micro_key_open(struct input_dev *input) 72 { 73 struct ipaq_micro_keys *keys = input_get_drvdata(input); 74 75 micro_key_start(keys); 76 77 return 0; 78 } 79 80 static void micro_key_close(struct input_dev *input) 81 { 82 struct ipaq_micro_keys *keys = input_get_drvdata(input); 83 84 micro_key_stop(keys); 85 } 86 87 static int micro_key_probe(struct platform_device *pdev) 88 { 89 struct ipaq_micro_keys *keys; 90 int error; 91 int i; 92 93 keys = devm_kzalloc(&pdev->dev, sizeof(*keys), GFP_KERNEL); 94 if (!keys) 95 return -ENOMEM; 96 97 keys->micro = dev_get_drvdata(pdev->dev.parent); 98 99 keys->input = devm_input_allocate_device(&pdev->dev); 100 if (!keys->input) 101 return -ENOMEM; 102 103 keys->input->keycodesize = sizeof(micro_keycodes[0]); 104 keys->input->keycodemax = ARRAY_SIZE(micro_keycodes); 105 keys->codes = devm_kmemdup(&pdev->dev, micro_keycodes, 106 keys->input->keycodesize * keys->input->keycodemax, 107 GFP_KERNEL); 108 keys->input->keycode = keys->codes; 109 110 __set_bit(EV_KEY, keys->input->evbit); 111 for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++) 112 __set_bit(micro_keycodes[i], keys->input->keybit); 113 114 keys->input->name = "h3600 micro keys"; 115 keys->input->open = micro_key_open; 116 keys->input->close = micro_key_close; 117 input_set_drvdata(keys->input, keys); 118 119 error = input_register_device(keys->input); 120 if (error) 121 return error; 122 123 platform_set_drvdata(pdev, keys); 124 return 0; 125 } 126 127 static int micro_key_suspend(struct device *dev) 128 { 129 struct ipaq_micro_keys *keys = dev_get_drvdata(dev); 130 131 micro_key_stop(keys); 132 133 return 0; 134 } 135 136 static int micro_key_resume(struct device *dev) 137 { 138 struct ipaq_micro_keys *keys = dev_get_drvdata(dev); 139 struct input_dev *input = keys->input; 140 141 mutex_lock(&input->mutex); 142 143 if (input_device_enabled(input)) 144 micro_key_start(keys); 145 146 mutex_unlock(&input->mutex); 147 148 return 0; 149 } 150 151 static DEFINE_SIMPLE_DEV_PM_OPS(micro_key_dev_pm_ops, 152 micro_key_suspend, micro_key_resume); 153 154 static struct platform_driver micro_key_device_driver = { 155 .driver = { 156 .name = "ipaq-micro-keys", 157 .pm = pm_sleep_ptr(µ_key_dev_pm_ops), 158 }, 159 .probe = micro_key_probe, 160 }; 161 module_platform_driver(micro_key_device_driver); 162 163 MODULE_LICENSE("GPL"); 164 MODULE_DESCRIPTION("driver for iPAQ Atmel micro keys"); 165 MODULE_ALIAS("platform:ipaq-micro-keys"); 166