1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2024 Linaro Ltd. 4 */ 5 6 #include <linux/device.h> 7 #include <linux/mod_devicetable.h> 8 #include <linux/module.h> 9 #include <linux/pci-pwrctrl.h> 10 #include <linux/platform_device.h> 11 #include <linux/property.h> 12 #include <linux/pwrseq/consumer.h> 13 #include <linux/slab.h> 14 #include <linux/types.h> 15 16 struct pwrseq_pwrctrl { 17 struct pci_pwrctrl pwrctrl; 18 struct pwrseq_desc *pwrseq; 19 }; 20 21 struct pwrseq_pwrctrl_pdata { 22 const char *target; 23 /* 24 * Called before doing anything else to perform device-specific 25 * verification between requesting the power sequencing handle. 26 */ 27 int (*validate_device)(struct device *dev); 28 }; 29 30 static int pwrseq_pwrctrl_qcm_wcn_validate_device(struct device *dev) 31 { 32 /* 33 * Old device trees for some platforms already define wifi nodes for 34 * the WCN family of chips since before power sequencing was added 35 * upstream. 36 * 37 * These nodes don't consume the regulator outputs from the PMU, and 38 * if we allow this driver to bind to one of such "incomplete" nodes, 39 * we'll see a kernel log error about the indefinite probe deferral. 40 * 41 * Check the existence of the regulator supply that exists on all 42 * WCN models before moving forward. 43 */ 44 if (!device_property_present(dev, "vddaon-supply")) 45 return -ENODEV; 46 47 return 0; 48 } 49 50 static const struct pwrseq_pwrctrl_pdata pwrseq_pwrctrl_qcom_wcn_pdata = { 51 .target = "wlan", 52 .validate_device = pwrseq_pwrctrl_qcm_wcn_validate_device, 53 }; 54 55 static int pwrseq_pwrctrl_power_on(struct pci_pwrctrl *pwrctrl) 56 { 57 struct pwrseq_pwrctrl *pwrseq = container_of(pwrctrl, 58 struct pwrseq_pwrctrl, pwrctrl); 59 60 return pwrseq_power_on(pwrseq->pwrseq); 61 } 62 63 static int pwrseq_pwrctrl_power_off(struct pci_pwrctrl *pwrctrl) 64 { 65 struct pwrseq_pwrctrl *pwrseq = container_of(pwrctrl, 66 struct pwrseq_pwrctrl, pwrctrl); 67 68 return pwrseq_power_off(pwrseq->pwrseq); 69 } 70 71 static int pwrseq_pwrctrl_probe(struct platform_device *pdev) 72 { 73 const struct pwrseq_pwrctrl_pdata *pdata; 74 struct pwrseq_pwrctrl *pwrseq; 75 struct device *dev = &pdev->dev; 76 int ret; 77 78 pdata = device_get_match_data(dev); 79 if (!pdata || !pdata->target) 80 return -EINVAL; 81 82 if (pdata->validate_device) { 83 ret = pdata->validate_device(dev); 84 if (ret) 85 return ret; 86 } 87 88 pwrseq = devm_kzalloc(dev, sizeof(*pwrseq), GFP_KERNEL); 89 if (!pwrseq) 90 return -ENOMEM; 91 92 pwrseq->pwrseq = devm_pwrseq_get(dev, pdata->target); 93 if (IS_ERR(pwrseq->pwrseq)) 94 return dev_err_probe(dev, PTR_ERR(pwrseq->pwrseq), 95 "Failed to get the power sequencer\n"); 96 97 pwrseq->pwrctrl.power_on = pwrseq_pwrctrl_power_on; 98 pwrseq->pwrctrl.power_off = pwrseq_pwrctrl_power_off; 99 100 pci_pwrctrl_init(&pwrseq->pwrctrl, dev); 101 102 ret = devm_pci_pwrctrl_device_set_ready(dev, &pwrseq->pwrctrl); 103 if (ret) 104 return dev_err_probe(dev, ret, 105 "Failed to register the pwrctrl wrapper\n"); 106 107 return 0; 108 } 109 110 static const struct of_device_id pwrseq_pwrctrl_of_match[] = { 111 { 112 /* ATH11K in QCA6390 package. */ 113 .compatible = "pci17cb,1101", 114 .data = &pwrseq_pwrctrl_qcom_wcn_pdata, 115 }, 116 { 117 /* ATH11K in WCN6855 package. */ 118 .compatible = "pci17cb,1103", 119 .data = &pwrseq_pwrctrl_qcom_wcn_pdata, 120 }, 121 { 122 /* ATH12K in WCN7850 package. */ 123 .compatible = "pci17cb,1107", 124 .data = &pwrseq_pwrctrl_qcom_wcn_pdata, 125 }, 126 { } 127 }; 128 MODULE_DEVICE_TABLE(of, pwrseq_pwrctrl_of_match); 129 130 static struct platform_driver pwrseq_pwrctrl_driver = { 131 .driver = { 132 .name = "pci-pwrctrl-pwrseq", 133 .of_match_table = pwrseq_pwrctrl_of_match, 134 }, 135 .probe = pwrseq_pwrctrl_probe, 136 }; 137 module_platform_driver(pwrseq_pwrctrl_driver); 138 139 MODULE_AUTHOR("Bartosz Golaszewski <bartosz.golaszewski@linaro.org>"); 140 MODULE_DESCRIPTION("Generic PCI Power Control module for power sequenced devices"); 141 MODULE_LICENSE("GPL"); 142