GNU Linux-libre 4.14.266-gnu1
[releases.git] / drivers / input / misc / tps65218-pwrbutton.c
1 /*
2  * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
3  *
4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
5  * Author: Felipe Balbi <balbi@ti.com>
6  * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  *
12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13  * kind, whether express or implied; without even the implied warranty
14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  */
17
18 #include <linux/init.h>
19 #include <linux/input.h>
20 #include <linux/interrupt.h>
21 #include <linux/kernel.h>
22 #include <linux/mfd/tps65217.h>
23 #include <linux/mfd/tps65218.h>
24 #include <linux/module.h>
25 #include <linux/of.h>
26 #include <linux/platform_device.h>
27 #include <linux/regmap.h>
28 #include <linux/slab.h>
29
30 struct tps6521x_data {
31         unsigned int reg_status;
32         unsigned int pb_mask;
33         const char *name;
34 };
35
36 static const struct tps6521x_data tps65217_data = {
37         .reg_status = TPS65217_REG_STATUS,
38         .pb_mask = TPS65217_STATUS_PB,
39         .name = "tps65217_pwrbutton",
40 };
41
42 static const struct tps6521x_data tps65218_data = {
43         .reg_status = TPS65218_REG_STATUS,
44         .pb_mask = TPS65218_STATUS_PB_STATE,
45         .name = "tps65218_pwrbutton",
46 };
47
48 struct tps6521x_pwrbutton {
49         struct device *dev;
50         struct regmap *regmap;
51         struct input_dev *idev;
52         const struct tps6521x_data *data;
53         char phys[32];
54 };
55
56 static const struct of_device_id of_tps6521x_pb_match[] = {
57         { .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
58         { .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
59         { },
60 };
61 MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
62
63 static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
64 {
65         struct tps6521x_pwrbutton *pwr = _pwr;
66         const struct tps6521x_data *tps_data = pwr->data;
67         unsigned int reg;
68         int error;
69
70         error = regmap_read(pwr->regmap, tps_data->reg_status, &reg);
71         if (error) {
72                 dev_err(pwr->dev, "can't read register: %d\n", error);
73                 goto out;
74         }
75
76         if (reg & tps_data->pb_mask) {
77                 input_report_key(pwr->idev, KEY_POWER, 1);
78                 pm_wakeup_event(pwr->dev, 0);
79         } else {
80                 input_report_key(pwr->idev, KEY_POWER, 0);
81         }
82
83         input_sync(pwr->idev);
84
85 out:
86         return IRQ_HANDLED;
87 }
88
89 static int tps6521x_pb_probe(struct platform_device *pdev)
90 {
91         struct device *dev = &pdev->dev;
92         struct tps6521x_pwrbutton *pwr;
93         struct input_dev *idev;
94         const struct of_device_id *match;
95         int error;
96         int irq;
97
98         match = of_match_node(of_tps6521x_pb_match, dev->of_node);
99         if (!match)
100                 return -ENXIO;
101
102         pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
103         if (!pwr)
104                 return -ENOMEM;
105
106         pwr->data = match->data;
107
108         idev = devm_input_allocate_device(dev);
109         if (!idev)
110                 return -ENOMEM;
111
112         idev->name = pwr->data->name;
113         snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
114                 pwr->data->name);
115         idev->phys = pwr->phys;
116         idev->dev.parent = dev;
117         idev->id.bustype = BUS_I2C;
118
119         input_set_capability(idev, EV_KEY, KEY_POWER);
120
121         pwr->regmap = dev_get_regmap(dev->parent, NULL);
122         pwr->dev = dev;
123         pwr->idev = idev;
124         device_init_wakeup(dev, true);
125
126         irq = platform_get_irq(pdev, 0);
127         if (irq < 0) {
128                 dev_err(dev, "No IRQ resource!\n");
129                 return -EINVAL;
130         }
131
132         error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
133                                           IRQF_TRIGGER_RISING |
134                                                 IRQF_TRIGGER_FALLING |
135                                                 IRQF_ONESHOT,
136                                           pwr->data->name, pwr);
137         if (error) {
138                 dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error);
139                 return error;
140         }
141
142         error= input_register_device(idev);
143         if (error) {
144                 dev_err(dev, "Can't register power button: %d\n", error);
145                 return error;
146         }
147
148         return 0;
149 }
150
151 static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
152         { "tps65218-pwrbutton", },
153         { "tps65217-pwrbutton", },
154         { /* sentinel */ }
155 };
156 MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
157
158 static struct platform_driver tps6521x_pb_driver = {
159         .probe  = tps6521x_pb_probe,
160         .driver = {
161                 .name   = "tps6521x_pwrbutton",
162                 .of_match_table = of_tps6521x_pb_match,
163         },
164         .id_table = tps6521x_pwrbtn_id_table,
165 };
166 module_platform_driver(tps6521x_pb_driver);
167
168 MODULE_DESCRIPTION("TPS6521X Power Button");
169 MODULE_LICENSE("GPL v2");
170 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");