1 /*
2  * Intel Low Power Subsystem PWM controller driver
3  *
4  * Copyright (C) 2014, Intel Corporation
5  *
6  * Derived from the original pwm-lpss.c
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 
13 #include <linux/acpi.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/pm_runtime.h>
18 
19 #include "pwm-lpss.h"
20 
21 /* BayTrail */
22 static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
23 	.clk_rate = 25000000,
24 	.npwm = 1,
25 	.base_unit_bits = 16,
26 };
27 
28 /* Braswell */
29 static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
30 	.clk_rate = 19200000,
31 	.npwm = 1,
32 	.base_unit_bits = 16,
33 };
34 
35 /* Broxton */
36 static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
37 	.clk_rate = 19200000,
38 	.npwm = 4,
39 	.base_unit_bits = 22,
40 	.bypass = true,
41 };
42 
43 static int pwm_lpss_probe_platform(struct platform_device *pdev)
44 {
45 	const struct pwm_lpss_boardinfo *info;
46 	const struct acpi_device_id *id;
47 	struct pwm_lpss_chip *lpwm;
48 	struct resource *r;
49 
50 	id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
51 	if (!id)
52 		return -ENODEV;
53 
54 	info = (const struct pwm_lpss_boardinfo *)id->driver_data;
55 	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
56 
57 	lpwm = pwm_lpss_probe(&pdev->dev, r, info);
58 	if (IS_ERR(lpwm))
59 		return PTR_ERR(lpwm);
60 
61 	platform_set_drvdata(pdev, lpwm);
62 
63 	pm_runtime_set_active(&pdev->dev);
64 	pm_runtime_enable(&pdev->dev);
65 
66 	return 0;
67 }
68 
69 static int pwm_lpss_remove_platform(struct platform_device *pdev)
70 {
71 	struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
72 
73 	pm_runtime_disable(&pdev->dev);
74 	return pwm_lpss_remove(lpwm);
75 }
76 
77 static SIMPLE_DEV_PM_OPS(pwm_lpss_platform_pm_ops,
78 			 pwm_lpss_suspend,
79 			 pwm_lpss_resume);
80 
81 static const struct acpi_device_id pwm_lpss_acpi_match[] = {
82 	{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
83 	{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
84 	{ "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
85 	{ },
86 };
87 MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
88 
89 static struct platform_driver pwm_lpss_driver_platform = {
90 	.driver = {
91 		.name = "pwm-lpss",
92 		.acpi_match_table = pwm_lpss_acpi_match,
93 		.pm = &pwm_lpss_platform_pm_ops,
94 	},
95 	.probe = pwm_lpss_probe_platform,
96 	.remove = pwm_lpss_remove_platform,
97 };
98 module_platform_driver(pwm_lpss_driver_platform);
99 
100 MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
101 MODULE_LICENSE("GPL v2");
102 MODULE_ALIAS("platform:pwm-lpss");
103