1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Copyright (C) 2018 BayLibre SAS
4 // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
5 //
6 // ONKEY driver for MAXIM 77650/77651 charger/power-supply.
7
8 #include <linux/i2c.h>
9 #include <linux/input.h>
10 #include <linux/interrupt.h>
11 #include <linux/mfd/max77650.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15
16 #define MAX77650_ONKEY_MODE_MASK BIT(3)
17 #define MAX77650_ONKEY_MODE_PUSH 0x00
18 #define MAX77650_ONKEY_MODE_SLIDE BIT(3)
19
20 struct max77650_onkey {
21 struct input_dev *input;
22 unsigned int code;
23 };
24
max77650_onkey_falling(int irq,void * data)25 static irqreturn_t max77650_onkey_falling(int irq, void *data)
26 {
27 struct max77650_onkey *onkey = data;
28
29 input_report_key(onkey->input, onkey->code, 0);
30 input_sync(onkey->input);
31
32 return IRQ_HANDLED;
33 }
34
max77650_onkey_rising(int irq,void * data)35 static irqreturn_t max77650_onkey_rising(int irq, void *data)
36 {
37 struct max77650_onkey *onkey = data;
38
39 input_report_key(onkey->input, onkey->code, 1);
40 input_sync(onkey->input);
41
42 return IRQ_HANDLED;
43 }
44
max77650_onkey_probe(struct platform_device * pdev)45 static int max77650_onkey_probe(struct platform_device *pdev)
46 {
47 int irq_r, irq_f, error, mode;
48 struct max77650_onkey *onkey;
49 struct device *dev, *parent;
50 struct regmap *map;
51 unsigned int type;
52
53 dev = &pdev->dev;
54 parent = dev->parent;
55
56 map = dev_get_regmap(parent, NULL);
57 if (!map)
58 return -ENODEV;
59
60 onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
61 if (!onkey)
62 return -ENOMEM;
63
64 error = device_property_read_u32(dev, "linux,code", &onkey->code);
65 if (error)
66 onkey->code = KEY_POWER;
67
68 if (device_property_read_bool(dev, "maxim,onkey-slide")) {
69 mode = MAX77650_ONKEY_MODE_SLIDE;
70 type = EV_SW;
71 } else {
72 mode = MAX77650_ONKEY_MODE_PUSH;
73 type = EV_KEY;
74 }
75
76 error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
77 MAX77650_ONKEY_MODE_MASK, mode);
78 if (error)
79 return error;
80
81 irq_f = platform_get_irq_byname(pdev, "nEN_F");
82 if (irq_f < 0)
83 return irq_f;
84
85 irq_r = platform_get_irq_byname(pdev, "nEN_R");
86 if (irq_r < 0)
87 return irq_r;
88
89 onkey->input = devm_input_allocate_device(dev);
90 if (!onkey->input)
91 return -ENOMEM;
92
93 onkey->input->name = "max77650_onkey";
94 onkey->input->phys = "max77650_onkey/input0";
95 onkey->input->id.bustype = BUS_I2C;
96 input_set_capability(onkey->input, type, onkey->code);
97
98 error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
99 IRQF_ONESHOT, "onkey-down", onkey);
100 if (error < 0)
101 return error;
102
103 error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
104 IRQF_ONESHOT, "onkey-up", onkey);
105 if (error < 0)
106 return error;
107
108 return input_register_device(onkey->input);
109 }
110
111 static const struct of_device_id max77650_onkey_of_match[] = {
112 { .compatible = "maxim,max77650-onkey" },
113 { }
114 };
115 MODULE_DEVICE_TABLE(of, max77650_onkey_of_match);
116
117 static struct platform_driver max77650_onkey_driver = {
118 .driver = {
119 .name = "max77650-onkey",
120 .of_match_table = max77650_onkey_of_match,
121 },
122 .probe = max77650_onkey_probe,
123 };
124 module_platform_driver(max77650_onkey_driver);
125
126 MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
127 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
128 MODULE_LICENSE("GPL v2");
129 MODULE_ALIAS("platform:max77650-onkey");
130