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
pwm_lpss_probe_platform(struct platform_device * pdev)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
pwm_lpss_remove_platform(struct platform_device * pdev)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