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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | // SPDX-License-Identifier: GPL-2.0-only /* * dptf_pch_fivr: DPTF PCH FIVR Participant driver * Copyright (c) 2020, Intel Corporation. */ #include <linux/acpi.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> struct pch_fivr_resp { u64 status; u64 result; }; static int pch_fivr_read(acpi_handle handle, char *method, struct pch_fivr_resp *fivr_resp) { struct acpi_buffer resp = { sizeof(struct pch_fivr_resp), fivr_resp}; struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; struct acpi_buffer format = { sizeof("NN"), "NN" }; union acpi_object *obj; acpi_status status; int ret = -EFAULT; status = acpi_evaluate_object(handle, method, NULL, &buffer); if (ACPI_FAILURE(status)) return ret; obj = buffer.pointer; if (!obj || obj->type != ACPI_TYPE_PACKAGE) goto release_buffer; status = acpi_extract_package(obj, &format, &resp); if (ACPI_FAILURE(status)) goto release_buffer; if (fivr_resp->status) goto release_buffer; ret = 0; release_buffer: kfree(buffer.pointer); return ret; } /* * Presentation of attributes which are defined for INTC10xx * They are: * freq_mhz_low_clock : Set PCH FIVR switching freq for * FIVR clock 19.2MHz and 24MHz * freq_mhz_high_clock : Set PCH FIVR switching freq for * FIVR clock 38.4MHz */ #define PCH_FIVR_SHOW(name, method) \ static ssize_t name##_show(struct device *dev,\ struct device_attribute *attr,\ char *buf)\ {\ struct acpi_device *acpi_dev = dev_get_drvdata(dev);\ struct pch_fivr_resp fivr_resp;\ int status;\ \ status = pch_fivr_read(acpi_dev->handle, #method, &fivr_resp);\ if (status)\ return status;\ \ return sprintf(buf, "%llu\n", fivr_resp.result);\ } #define PCH_FIVR_STORE(name, method) \ static ssize_t name##_store(struct device *dev,\ struct device_attribute *attr,\ const char *buf, size_t count)\ {\ struct acpi_device *acpi_dev = dev_get_drvdata(dev);\ acpi_status status;\ u32 val;\ \ if (kstrtouint(buf, 0, &val) < 0)\ return -EINVAL;\ \ status = acpi_execute_simple_method(acpi_dev->handle, #method, val);\ if (ACPI_SUCCESS(status))\ return count;\ \ return -EINVAL;\ } PCH_FIVR_SHOW(freq_mhz_low_clock, GFC0) PCH_FIVR_SHOW(freq_mhz_high_clock, GFC1) PCH_FIVR_SHOW(ssc_clock_info, GEMI) PCH_FIVR_SHOW(fivr_switching_freq_mhz, GFCS) PCH_FIVR_SHOW(fivr_switching_fault_status, GFFS) PCH_FIVR_STORE(freq_mhz_low_clock, RFC0) PCH_FIVR_STORE(freq_mhz_high_clock, RFC1) static DEVICE_ATTR_RW(freq_mhz_low_clock); static DEVICE_ATTR_RW(freq_mhz_high_clock); static DEVICE_ATTR_RO(ssc_clock_info); static DEVICE_ATTR_RO(fivr_switching_freq_mhz); static DEVICE_ATTR_RO(fivr_switching_fault_status); static struct attribute *fivr_attrs[] = { &dev_attr_freq_mhz_low_clock.attr, &dev_attr_freq_mhz_high_clock.attr, &dev_attr_ssc_clock_info.attr, &dev_attr_fivr_switching_freq_mhz.attr, &dev_attr_fivr_switching_fault_status.attr, NULL }; static const struct attribute_group pch_fivr_attribute_group = { .attrs = fivr_attrs, .name = "pch_fivr_switch_frequency" }; static int pch_fivr_add(struct platform_device *pdev) { struct acpi_device *acpi_dev; unsigned long long ptype; acpi_status status; int result; acpi_dev = ACPI_COMPANION(&(pdev->dev)); if (!acpi_dev) return -ENODEV; status = acpi_evaluate_integer(acpi_dev->handle, "PTYP", NULL, &ptype); if (ACPI_FAILURE(status) || ptype != 0x05) return -ENODEV; result = sysfs_create_group(&pdev->dev.kobj, &pch_fivr_attribute_group); if (result) return result; platform_set_drvdata(pdev, acpi_dev); return 0; } static void pch_fivr_remove(struct platform_device *pdev) { sysfs_remove_group(&pdev->dev.kobj, &pch_fivr_attribute_group); } static const struct acpi_device_id pch_fivr_device_ids[] = { {"INTC1045", 0}, {"INTC1049", 0}, {"INTC1064", 0}, {"INTC106B", 0}, {"INTC10A3", 0}, {"", 0}, }; MODULE_DEVICE_TABLE(acpi, pch_fivr_device_ids); static struct platform_driver pch_fivr_driver = { .probe = pch_fivr_add, .remove_new = pch_fivr_remove, .driver = { .name = "dptf_pch_fivr", .acpi_match_table = pch_fivr_device_ids, }, }; module_platform_driver(pch_fivr_driver); MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("ACPI DPTF PCH FIVR driver"); |