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
tps65219_pb_push_irq(int irq,void * _pwr)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
tps65219_pb_release_irq(int irq,void * _pwr)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
tps65219_pb_probe(struct platform_device * pdev)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
tps65219_pb_remove(struct platform_device * pdev)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