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 static const u16 micro_keycodes[] = { 24 KEY_RECORD, /* 1: Record button */ 25 KEY_CALENDAR, /* 2: Calendar */ 26 KEY_ADDRESSBOOK, /* 3: Contacts (looks like Outlook) */ 27 KEY_MAIL, /* 4: Envelope (Q on older iPAQs) */ 28 KEY_HOMEPAGE, /* 5: Start (looks like swoopy arrow) */ 29 KEY_UP, /* 6: Up */ 30 KEY_RIGHT, /* 7: Right */ 31 KEY_LEFT, /* 8: Left */ 32 KEY_DOWN, /* 9: Down */ 33 }; 34 35 struct ipaq_micro_keys { 36 struct ipaq_micro *micro; 37 struct input_dev *input; 38 u16 codes[ARRAY_SIZE(micro_keycodes)]; 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 if (len < 1) 47 return; 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 guard(spinlock_irq)(&keys->micro->lock); 61 62 keys->micro->key = micro_key_receive; 63 keys->micro->key_data = keys; 64 } 65 66 static void micro_key_stop(struct ipaq_micro_keys *keys) 67 { 68 guard(spinlock_irq)(&keys->micro->lock); 69 70 keys->micro->key = NULL; 71 keys->micro->key_data = NULL; 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 memcpy(keys->codes, micro_keycodes, sizeof(keys->codes)); 109 110 keys->input->keycode = keys->codes; 111 112 __set_bit(EV_KEY, keys->input->evbit); 113 for (i = 0; i < ARRAY_SIZE(micro_keycodes); i++) 114 __set_bit(micro_keycodes[i], keys->input->keybit); 115 116 keys->input->name = "h3600 micro keys"; 117 keys->input->open = micro_key_open; 118 keys->input->close = micro_key_close; 119 input_set_drvdata(keys->input, keys); 120 121 error = input_register_device(keys->input); 122 if (error) 123 return error; 124 125 platform_set_drvdata(pdev, keys); 126 return 0; 127 } 128 129 static int micro_key_suspend(struct device *dev) 130 { 131 struct ipaq_micro_keys *keys = dev_get_drvdata(dev); 132 133 micro_key_stop(keys); 134 135 return 0; 136 } 137 138 static int micro_key_resume(struct device *dev) 139 { 140 struct ipaq_micro_keys *keys = dev_get_drvdata(dev); 141 struct input_dev *input = keys->input; 142 143 guard(mutex)(&input->mutex); 144 145 if (input_device_enabled(input)) 146 micro_key_start(keys); 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