1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Power-button driver for Basin Cove PMIC
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (c) 2019, Intel Corporation.
6*4882a593Smuzhiyun * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/input.h>
10*4882a593Smuzhiyun #include <linux/interrupt.h>
11*4882a593Smuzhiyun #include <linux/device.h>
12*4882a593Smuzhiyun #include <linux/mfd/intel_soc_pmic.h>
13*4882a593Smuzhiyun #include <linux/mfd/intel_soc_pmic_mrfld.h>
14*4882a593Smuzhiyun #include <linux/module.h>
15*4882a593Smuzhiyun #include <linux/platform_device.h>
16*4882a593Smuzhiyun #include <linux/pm_wakeirq.h>
17*4882a593Smuzhiyun #include <linux/slab.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #define BCOVE_PBSTATUS 0x27
20*4882a593Smuzhiyun #define BCOVE_PBSTATUS_PBLVL BIT(4) /* 1 - release, 0 - press */
21*4882a593Smuzhiyun
mrfld_pwrbtn_interrupt(int irq,void * dev_id)22*4882a593Smuzhiyun static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
23*4882a593Smuzhiyun {
24*4882a593Smuzhiyun struct input_dev *input = dev_id;
25*4882a593Smuzhiyun struct device *dev = input->dev.parent;
26*4882a593Smuzhiyun struct regmap *regmap = dev_get_drvdata(dev);
27*4882a593Smuzhiyun unsigned int state;
28*4882a593Smuzhiyun int ret;
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
31*4882a593Smuzhiyun if (ret)
32*4882a593Smuzhiyun return IRQ_NONE;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun dev_dbg(dev, "PBSTATUS=0x%x\n", state);
35*4882a593Smuzhiyun input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
36*4882a593Smuzhiyun input_sync(input);
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
39*4882a593Smuzhiyun return IRQ_HANDLED;
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
mrfld_pwrbtn_probe(struct platform_device * pdev)42*4882a593Smuzhiyun static int mrfld_pwrbtn_probe(struct platform_device *pdev)
43*4882a593Smuzhiyun {
44*4882a593Smuzhiyun struct device *dev = &pdev->dev;
45*4882a593Smuzhiyun struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
46*4882a593Smuzhiyun struct input_dev *input;
47*4882a593Smuzhiyun int irq, ret;
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun irq = platform_get_irq(pdev, 0);
50*4882a593Smuzhiyun if (irq < 0)
51*4882a593Smuzhiyun return irq;
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun input = devm_input_allocate_device(dev);
54*4882a593Smuzhiyun if (!input)
55*4882a593Smuzhiyun return -ENOMEM;
56*4882a593Smuzhiyun input->name = pdev->name;
57*4882a593Smuzhiyun input->phys = "power-button/input0";
58*4882a593Smuzhiyun input->id.bustype = BUS_HOST;
59*4882a593Smuzhiyun input->dev.parent = dev;
60*4882a593Smuzhiyun input_set_capability(input, EV_KEY, KEY_POWER);
61*4882a593Smuzhiyun ret = input_register_device(input);
62*4882a593Smuzhiyun if (ret)
63*4882a593Smuzhiyun return ret;
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun dev_set_drvdata(dev, pmic->regmap);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
68*4882a593Smuzhiyun IRQF_ONESHOT | IRQF_SHARED, pdev->name,
69*4882a593Smuzhiyun input);
70*4882a593Smuzhiyun if (ret)
71*4882a593Smuzhiyun return ret;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
74*4882a593Smuzhiyun regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun device_init_wakeup(dev, true);
77*4882a593Smuzhiyun dev_pm_set_wake_irq(dev, irq);
78*4882a593Smuzhiyun return 0;
79*4882a593Smuzhiyun }
80*4882a593Smuzhiyun
mrfld_pwrbtn_remove(struct platform_device * pdev)81*4882a593Smuzhiyun static int mrfld_pwrbtn_remove(struct platform_device *pdev)
82*4882a593Smuzhiyun {
83*4882a593Smuzhiyun struct device *dev = &pdev->dev;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun dev_pm_clear_wake_irq(dev);
86*4882a593Smuzhiyun device_init_wakeup(dev, false);
87*4882a593Smuzhiyun return 0;
88*4882a593Smuzhiyun }
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
91*4882a593Smuzhiyun { .name = "mrfld_bcove_pwrbtn" },
92*4882a593Smuzhiyun {}
93*4882a593Smuzhiyun };
94*4882a593Smuzhiyun MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
95*4882a593Smuzhiyun
96*4882a593Smuzhiyun static struct platform_driver mrfld_pwrbtn_driver = {
97*4882a593Smuzhiyun .driver = {
98*4882a593Smuzhiyun .name = "mrfld_bcove_pwrbtn",
99*4882a593Smuzhiyun },
100*4882a593Smuzhiyun .probe = mrfld_pwrbtn_probe,
101*4882a593Smuzhiyun .remove = mrfld_pwrbtn_remove,
102*4882a593Smuzhiyun .id_table = mrfld_pwrbtn_id_table,
103*4882a593Smuzhiyun };
104*4882a593Smuzhiyun module_platform_driver(mrfld_pwrbtn_driver);
105*4882a593Smuzhiyun
106*4882a593Smuzhiyun MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
107*4882a593Smuzhiyun MODULE_LICENSE("GPL v2");
108