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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 | // SPDX-License-Identifier: GPL-2.0-or-later /* * PowerNV sensor code * * Copyright (C) 2013 IBM */ #include <linux/delay.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <asm/opal.h> #include <asm/machdep.h> /* * This will return sensor information to driver based on the requested sensor * handle. A handle is an opaque id for the powernv, read by the driver from the * device tree.. */ int opal_get_sensor_data(u32 sensor_hndl, u32 *sensor_data) { int ret, token; struct opal_msg msg; __be32 data; token = opal_async_get_token_interruptible(); if (token < 0) return token; ret = opal_sensor_read(sensor_hndl, token, &data); switch (ret) { case OPAL_ASYNC_COMPLETION: ret = opal_async_wait_response(token, &msg); if (ret) { pr_err("%s: Failed to wait for the async response, %d\n", __func__, ret); goto out; } ret = opal_error_code(opal_get_async_rc(msg)); *sensor_data = be32_to_cpu(data); break; case OPAL_SUCCESS: ret = 0; *sensor_data = be32_to_cpu(data); break; case OPAL_WRONG_STATE: ret = -EIO; break; default: ret = opal_error_code(ret); break; } out: opal_async_release_token(token); return ret; } EXPORT_SYMBOL_GPL(opal_get_sensor_data); int opal_get_sensor_data_u64(u32 sensor_hndl, u64 *sensor_data) { int ret, token; struct opal_msg msg; __be64 data; if (!opal_check_token(OPAL_SENSOR_READ_U64)) { u32 sdata; ret = opal_get_sensor_data(sensor_hndl, &sdata); if (!ret) *sensor_data = sdata; return ret; } token = opal_async_get_token_interruptible(); if (token < 0) return token; ret = opal_sensor_read_u64(sensor_hndl, token, &data); switch (ret) { case OPAL_ASYNC_COMPLETION: ret = opal_async_wait_response(token, &msg); if (ret) { pr_err("%s: Failed to wait for the async response, %d\n", __func__, ret); goto out_token; } ret = opal_error_code(opal_get_async_rc(msg)); *sensor_data = be64_to_cpu(data); break; case OPAL_SUCCESS: ret = 0; *sensor_data = be64_to_cpu(data); break; case OPAL_WRONG_STATE: ret = -EIO; break; default: ret = opal_error_code(ret); break; } out_token: opal_async_release_token(token); return ret; } EXPORT_SYMBOL_GPL(opal_get_sensor_data_u64); int __init opal_sensor_init(void) { struct platform_device *pdev; struct device_node *sensor; sensor = of_find_node_by_path("/ibm,opal/sensors"); if (!sensor) { pr_err("Opal node 'sensors' not found\n"); return -ENODEV; } pdev = of_platform_device_create(sensor, "opal-sensor", NULL); of_node_put(sensor); return PTR_ERR_OR_ZERO(pdev); } |