| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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"); |