1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Driver for TPS65219 Push Button
4 //
5 // Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/
6 
7 #include <linux/init.h>
8 #include <linux/input.h>
9 #include <linux/interrupt.h>
10 #include <linux/kernel.h>
11 #include <linux/mfd/tps65219.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15 #include <linux/regmap.h>
16 #include <linux/slab.h>
17 
18 struct tps65219_pwrbutton {
19 	struct device *dev;
20 	struct input_dev *idev;
21 	char phys[32];
22 };
23 
24 static irqreturn_t tps65219_pb_push_irq(int irq, void *_pwr)
25 {
26 	struct tps65219_pwrbutton *pwr = _pwr;
27 
28 	input_report_key(pwr->idev, KEY_POWER, 1);
29 	pm_wakeup_event(pwr->dev, 0);
30 	input_sync(pwr->idev);
31 
32 	return IRQ_HANDLED;
33 }
34 
35 static irqreturn_t tps65219_pb_release_irq(int irq, void *_pwr)
36 {
37 	struct tps65219_pwrbutton *pwr = _pwr;
38 
39 	input_report_key(pwr->idev, KEY_POWER, 0);
40 	input_sync(pwr->idev);
41 
42 	return IRQ_HANDLED;
43 }
44 
45 static int tps65219_pb_probe(struct platform_device *pdev)
46 {
47 	struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
48 	struct device *dev = &pdev->dev;
49 	struct tps65219_pwrbutton *pwr;
50 	struct input_dev *idev;
51 	int error;
52 	int push_irq;
53 	int release_irq;
54 
55 	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
56 	if (!pwr)
57 		return -ENOMEM;
58 
59 	idev = devm_input_allocate_device(dev);
60 	if (!idev)
61 		return -ENOMEM;
62 
63 	idev->name = pdev->name;
64 	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
65 		 pdev->name);
66 	idev->phys = pwr->phys;
67 	idev->id.bustype = BUS_I2C;
68 
69 	input_set_capability(idev, EV_KEY, KEY_POWER);
70 
71 	pwr->dev = dev;
72 	pwr->idev = idev;
73 	device_init_wakeup(dev, true);
74 
75 	push_irq = platform_get_irq(pdev, 0);
76 	if (push_irq < 0)
77 		return -EINVAL;
78 
79 	release_irq = platform_get_irq(pdev, 1);
80 	if (release_irq < 0)
81 		return -EINVAL;
82 
83 	error = devm_request_threaded_irq(dev, push_irq, NULL,
84 					  tps65219_pb_push_irq,
85 					  IRQF_ONESHOT,
86 					  dev->init_name, pwr);
87 	if (error) {
88 		dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
89 			error);
90 		return error;
91 	}
92 
93 	error = devm_request_threaded_irq(dev, release_irq, NULL,
94 					  tps65219_pb_release_irq,
95 					  IRQF_ONESHOT,
96 					  dev->init_name, pwr);
97 	if (error) {
98 		dev_err(dev, "failed to request release IRQ #%d: %d\n",
99 			release_irq, error);
100 		return error;
101 	}
102 
103 	error = input_register_device(idev);
104 	if (error) {
105 		dev_err(dev, "Can't register power button: %d\n", error);
106 		return error;
107 	}
108 
109 	/* Enable interrupts for the pushbutton */
110 	regmap_clear_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
111 			  TPS65219_REG_MASK_INT_FOR_PB_MASK);
112 
113 	/* Set PB/EN/VSENSE pin to be a pushbutton */
114 	regmap_update_bits(tps->regmap, TPS65219_REG_MFP_2_CONFIG,
115 			   TPS65219_MFP_2_EN_PB_VSENSE_MASK, TPS65219_MFP_2_PB);
116 
117 	return 0;
118 }
119 
120 static void tps65219_pb_remove(struct platform_device *pdev)
121 {
122 	struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
123 	int ret;
124 
125 	/* Disable interrupt for the pushbutton */
126 	ret = regmap_set_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
127 			      TPS65219_REG_MASK_INT_FOR_PB_MASK);
128 	if (ret)
129 		dev_warn(&pdev->dev, "Failed to disable irq (%pe)\n", ERR_PTR(ret));
130 }
131 
132 static const struct platform_device_id tps65219_pwrbtn_id_table[] = {
133 	{ "tps65219-pwrbutton", },
134 	{ /* sentinel */ }
135 };
136 MODULE_DEVICE_TABLE(platform, tps65219_pwrbtn_id_table);
137 
138 static struct platform_driver tps65219_pb_driver = {
139 	.probe = tps65219_pb_probe,
140 	.remove_new = tps65219_pb_remove,
141 	.driver = {
142 		.name = "tps65219_pwrbutton",
143 	},
144 	.id_table = tps65219_pwrbtn_id_table,
145 };
146 module_platform_driver(tps65219_pb_driver);
147 
148 MODULE_DESCRIPTION("TPS65219 Power Button");
149 MODULE_LICENSE("GPL");
150 MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com");
151