1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2018-2020 NXP. 4 */ 5 6 #include <dt-bindings/firmware/imx/rsrc.h> 7 #include <linux/err.h> 8 #include <linux/firmware/imx/sci.h> 9 #include <linux/module.h> 10 #include <linux/of.h> 11 #include <linux/of_device.h> 12 #include <linux/platform_device.h> 13 #include <linux/slab.h> 14 #include <linux/thermal.h> 15 16 #include "thermal_core.h" 17 #include "thermal_hwmon.h" 18 19 #define IMX_SC_MISC_FUNC_GET_TEMP 13 20 21 static struct imx_sc_ipc *thermal_ipc_handle; 22 23 struct imx_sc_sensor { 24 struct thermal_zone_device *tzd; 25 u32 resource_id; 26 }; 27 28 struct req_get_temp { 29 u16 resource_id; 30 u8 type; 31 } __packed __aligned(4); 32 33 struct resp_get_temp { 34 s16 celsius; 35 s8 tenths; 36 } __packed __aligned(4); 37 38 struct imx_sc_msg_misc_get_temp { 39 struct imx_sc_rpc_msg hdr; 40 union { 41 struct req_get_temp req; 42 struct resp_get_temp resp; 43 } data; 44 } __packed __aligned(4); 45 46 static int imx_sc_thermal_get_temp(struct thermal_zone_device *tz, int *temp) 47 { 48 struct imx_sc_msg_misc_get_temp msg; 49 struct imx_sc_rpc_msg *hdr = &msg.hdr; 50 struct imx_sc_sensor *sensor = tz->devdata; 51 int ret; 52 53 msg.data.req.resource_id = sensor->resource_id; 54 msg.data.req.type = IMX_SC_C_TEMP; 55 56 hdr->ver = IMX_SC_RPC_VERSION; 57 hdr->svc = IMX_SC_RPC_SVC_MISC; 58 hdr->func = IMX_SC_MISC_FUNC_GET_TEMP; 59 hdr->size = 2; 60 61 ret = imx_scu_call_rpc(thermal_ipc_handle, &msg, true); 62 if (ret) { 63 dev_err(&sensor->tzd->device, "read temp sensor %d failed, ret %d\n", 64 sensor->resource_id, ret); 65 return ret; 66 } 67 68 *temp = msg.data.resp.celsius * 1000 + msg.data.resp.tenths * 100; 69 70 return 0; 71 } 72 73 static const struct thermal_zone_device_ops imx_sc_thermal_ops = { 74 .get_temp = imx_sc_thermal_get_temp, 75 }; 76 77 static int imx_sc_thermal_probe(struct platform_device *pdev) 78 { 79 struct imx_sc_sensor *sensor; 80 const int *resource_id; 81 int i, ret; 82 83 ret = imx_scu_get_handle(&thermal_ipc_handle); 84 if (ret) 85 return ret; 86 87 resource_id = of_device_get_match_data(&pdev->dev); 88 if (!resource_id) 89 return -EINVAL; 90 91 for (i = 0; resource_id[i] > 0; i++) { 92 93 sensor = devm_kzalloc(&pdev->dev, sizeof(*sensor), GFP_KERNEL); 94 if (!sensor) 95 return -ENOMEM; 96 97 sensor->resource_id = resource_id[i]; 98 99 sensor->tzd = devm_thermal_of_zone_register(&pdev->dev, sensor->resource_id, 100 sensor, &imx_sc_thermal_ops); 101 if (IS_ERR(sensor->tzd)) { 102 /* 103 * Save the error value before freeing the 104 * sensor pointer, otherwise we endup with a 105 * use-after-free error 106 */ 107 ret = PTR_ERR(sensor->tzd); 108 109 devm_kfree(&pdev->dev, sensor); 110 111 /* 112 * The thermal framework notifies us there is 113 * no thermal zone description for such a 114 * sensor id 115 */ 116 if (ret == -ENODEV) 117 continue; 118 119 dev_err(&pdev->dev, "failed to register thermal zone\n"); 120 return ret; 121 } 122 123 if (devm_thermal_add_hwmon_sysfs(sensor->tzd)) 124 dev_warn(&pdev->dev, "failed to add hwmon sysfs attributes\n"); 125 } 126 127 return 0; 128 } 129 130 static int imx_sc_thermal_remove(struct platform_device *pdev) 131 { 132 return 0; 133 } 134 135 static int imx_sc_sensors[] = { IMX_SC_R_SYSTEM, IMX_SC_R_PMIC_0, -1 }; 136 137 static const struct of_device_id imx_sc_thermal_table[] = { 138 { .compatible = "fsl,imx-sc-thermal", .data = imx_sc_sensors }, 139 {} 140 }; 141 MODULE_DEVICE_TABLE(of, imx_sc_thermal_table); 142 143 static struct platform_driver imx_sc_thermal_driver = { 144 .probe = imx_sc_thermal_probe, 145 .remove = imx_sc_thermal_remove, 146 .driver = { 147 .name = "imx-sc-thermal", 148 .of_match_table = imx_sc_thermal_table, 149 }, 150 }; 151 module_platform_driver(imx_sc_thermal_driver); 152 153 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); 154 MODULE_DESCRIPTION("Thermal driver for NXP i.MX SoCs with system controller"); 155 MODULE_LICENSE("GPL v2"); 156