1f51c108dSKate Hsuan // SPDX-License-Identifier: GPL-2.0
2f51c108dSKate Hsuan /*
3f51c108dSKate Hsuan * Power-button driver for Basin Cove PMIC
4f51c108dSKate Hsuan *
5f51c108dSKate Hsuan * Copyright (c) 2019, Intel Corporation.
6f51c108dSKate Hsuan * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7f51c108dSKate Hsuan */
8f51c108dSKate Hsuan
9f51c108dSKate Hsuan #include <linux/input.h>
10f51c108dSKate Hsuan #include <linux/interrupt.h>
11f51c108dSKate Hsuan #include <linux/device.h>
12f51c108dSKate Hsuan #include <linux/mfd/intel_soc_pmic.h>
13f51c108dSKate Hsuan #include <linux/mfd/intel_soc_pmic_mrfld.h>
14f51c108dSKate Hsuan #include <linux/module.h>
15f51c108dSKate Hsuan #include <linux/platform_device.h>
16f51c108dSKate Hsuan #include <linux/pm_wakeirq.h>
17f51c108dSKate Hsuan #include <linux/slab.h>
18f51c108dSKate Hsuan
19f51c108dSKate Hsuan #define BCOVE_PBSTATUS 0x27
20f51c108dSKate Hsuan #define BCOVE_PBSTATUS_PBLVL BIT(4) /* 1 - release, 0 - press */
21f51c108dSKate Hsuan
mrfld_pwrbtn_interrupt(int irq,void * dev_id)22f51c108dSKate Hsuan static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
23f51c108dSKate Hsuan {
24f51c108dSKate Hsuan struct input_dev *input = dev_id;
25f51c108dSKate Hsuan struct device *dev = input->dev.parent;
26f51c108dSKate Hsuan struct regmap *regmap = dev_get_drvdata(dev);
27f51c108dSKate Hsuan unsigned int state;
28f51c108dSKate Hsuan int ret;
29f51c108dSKate Hsuan
30f51c108dSKate Hsuan ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
31f51c108dSKate Hsuan if (ret)
32f51c108dSKate Hsuan return IRQ_NONE;
33f51c108dSKate Hsuan
34f51c108dSKate Hsuan dev_dbg(dev, "PBSTATUS=0x%x\n", state);
35f51c108dSKate Hsuan input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
36f51c108dSKate Hsuan input_sync(input);
37f51c108dSKate Hsuan
38f51c108dSKate Hsuan regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
39f51c108dSKate Hsuan return IRQ_HANDLED;
40f51c108dSKate Hsuan }
41f51c108dSKate Hsuan
mrfld_pwrbtn_probe(struct platform_device * pdev)42f51c108dSKate Hsuan static int mrfld_pwrbtn_probe(struct platform_device *pdev)
43f51c108dSKate Hsuan {
44f51c108dSKate Hsuan struct device *dev = &pdev->dev;
45f51c108dSKate Hsuan struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
46f51c108dSKate Hsuan struct input_dev *input;
47f51c108dSKate Hsuan int irq, ret;
48f51c108dSKate Hsuan
49f51c108dSKate Hsuan irq = platform_get_irq(pdev, 0);
50f51c108dSKate Hsuan if (irq < 0)
51f51c108dSKate Hsuan return irq;
52f51c108dSKate Hsuan
53f51c108dSKate Hsuan input = devm_input_allocate_device(dev);
54f51c108dSKate Hsuan if (!input)
55f51c108dSKate Hsuan return -ENOMEM;
56f51c108dSKate Hsuan input->name = pdev->name;
57f51c108dSKate Hsuan input->phys = "power-button/input0";
58f51c108dSKate Hsuan input->id.bustype = BUS_HOST;
59f51c108dSKate Hsuan input->dev.parent = dev;
60f51c108dSKate Hsuan input_set_capability(input, EV_KEY, KEY_POWER);
61f51c108dSKate Hsuan ret = input_register_device(input);
62f51c108dSKate Hsuan if (ret)
63f51c108dSKate Hsuan return ret;
64f51c108dSKate Hsuan
65f51c108dSKate Hsuan dev_set_drvdata(dev, pmic->regmap);
66f51c108dSKate Hsuan
67f51c108dSKate Hsuan ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
68f51c108dSKate Hsuan IRQF_ONESHOT | IRQF_SHARED, pdev->name,
69f51c108dSKate Hsuan input);
70f51c108dSKate Hsuan if (ret)
71f51c108dSKate Hsuan return ret;
72f51c108dSKate Hsuan
73f51c108dSKate Hsuan regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
74f51c108dSKate Hsuan regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
75f51c108dSKate Hsuan
76f51c108dSKate Hsuan device_init_wakeup(dev, true);
77f51c108dSKate Hsuan dev_pm_set_wake_irq(dev, irq);
78f51c108dSKate Hsuan return 0;
79f51c108dSKate Hsuan }
80f51c108dSKate Hsuan
mrfld_pwrbtn_remove(struct platform_device * pdev)81*ee12d8b4SUwe Kleine-König static void mrfld_pwrbtn_remove(struct platform_device *pdev)
82f51c108dSKate Hsuan {
83f51c108dSKate Hsuan struct device *dev = &pdev->dev;
84f51c108dSKate Hsuan
85f51c108dSKate Hsuan dev_pm_clear_wake_irq(dev);
86f51c108dSKate Hsuan device_init_wakeup(dev, false);
87f51c108dSKate Hsuan }
88f51c108dSKate Hsuan
89f51c108dSKate Hsuan static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
90f51c108dSKate Hsuan { .name = "mrfld_bcove_pwrbtn" },
91f51c108dSKate Hsuan {}
92f51c108dSKate Hsuan };
93f51c108dSKate Hsuan MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
94f51c108dSKate Hsuan
95f51c108dSKate Hsuan static struct platform_driver mrfld_pwrbtn_driver = {
96f51c108dSKate Hsuan .driver = {
97f51c108dSKate Hsuan .name = "mrfld_bcove_pwrbtn",
98f51c108dSKate Hsuan },
99f51c108dSKate Hsuan .probe = mrfld_pwrbtn_probe,
100*ee12d8b4SUwe Kleine-König .remove_new = mrfld_pwrbtn_remove,
101f51c108dSKate Hsuan .id_table = mrfld_pwrbtn_id_table,
102f51c108dSKate Hsuan };
103f51c108dSKate Hsuan module_platform_driver(mrfld_pwrbtn_driver);
104f51c108dSKate Hsuan
105f51c108dSKate Hsuan MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
106f51c108dSKate Hsuan MODULE_LICENSE("GPL v2");
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