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 | |
25 | static irqreturn_t max77650_onkey_falling(int irq, void *data) |
26 | { |
27 | struct max77650_onkey *onkey = data; |
28 | |
29 | input_report_key(dev: onkey->input, code: onkey->code, value: 0); |
30 | input_sync(dev: onkey->input); |
31 | |
32 | return IRQ_HANDLED; |
33 | } |
34 | |
35 | static irqreturn_t max77650_onkey_rising(int irq, void *data) |
36 | { |
37 | struct max77650_onkey *onkey = data; |
38 | |
39 | input_report_key(dev: onkey->input, code: onkey->code, value: 1); |
40 | input_sync(dev: onkey->input); |
41 | |
42 | return IRQ_HANDLED; |
43 | } |
44 | |
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(dev: parent, NULL); |
57 | if (!map) |
58 | return -ENODEV; |
59 | |
60 | onkey = devm_kzalloc(dev, size: sizeof(*onkey), GFP_KERNEL); |
61 | if (!onkey) |
62 | return -ENOMEM; |
63 | |
64 | error = device_property_read_u32(dev, propname: "linux,code" , val: &onkey->code); |
65 | if (error) |
66 | onkey->code = KEY_POWER; |
67 | |
68 | if (device_property_read_bool(dev, propname: "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, val: 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(dev: onkey->input, type, code: onkey->code); |
97 | |
98 | error = devm_request_any_context_irq(dev, irq: irq_f, handler: max77650_onkey_falling, |
99 | IRQF_ONESHOT, devname: "onkey-down" , dev_id: onkey); |
100 | if (error < 0) |
101 | return error; |
102 | |
103 | error = devm_request_any_context_irq(dev, irq: irq_r, handler: max77650_onkey_rising, |
104 | IRQF_ONESHOT, devname: "onkey-up" , dev_id: 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 | |