drivers/rtc/rtc-imx-sm-bbm.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2024 NXP.
   4  */
   5
   6 #include <linux/jiffies.h>
   7 #include <linux/module.h>
   8 #include <linux/platform_device.h>
   9 #include <linux/rtc.h>
  10 #include <linux/scmi_protocol.h>
  11 #include <linux/scmi_imx_protocol.h>
  12
  13 struct scmi_imx_bbm {
  14         const struct scmi_imx_bbm_proto_ops *ops;
  15         struct rtc_device *rtc_dev;
  16         struct scmi_protocol_handle *ph;
  17         struct notifier_block nb;
  18 };
  19
  20 static int scmi_imx_bbm_read_time(struct device *dev, struct rtc_time *tm)
  21 {
  22         struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
  23         struct scmi_protocol_handle *ph = bbnsm->ph;
  24         u64 val;
  25         int ret;
  26
  27         ret = bbnsm->ops->rtc_time_get(ph, 0, &val);
  28         if (ret)
  29                 return ret;
  30
  31         rtc_time64_to_tm(val, tm);
  32
  33         return 0;
  34 }
  35
  36 static int scmi_imx_bbm_set_time(struct device *dev, struct rtc_time *tm)
  37 {
  38         struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
  39         struct scmi_protocol_handle *ph = bbnsm->ph;
  40         u64 val;
  41
  42         val = rtc_tm_to_time64(tm);
  43
  44         return bbnsm->ops->rtc_time_set(ph, 0, val);
  45 }
  46
  47 static int scmi_imx_bbm_alarm_irq_enable(struct device *dev, unsigned int enable)
  48 {
  49         struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
  50         struct scmi_protocol_handle *ph = bbnsm->ph;
  51
  52         /* scmi_imx_bbm_set_alarm enables the irq, just handle disable here */
  53         if (!enable)
  54                 return bbnsm->ops->rtc_alarm_set(ph, 0, false, 0);
  55
  56         return 0;
  57 }
  58
  59 static int scmi_imx_bbm_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
  60 {
  61         struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
  62         struct scmi_protocol_handle *ph = bbnsm->ph;
  63         struct rtc_time *alrm_tm = &alrm->time;
  64         u64 val;
  65
  66         val = rtc_tm_to_time64(alrm_tm);
  67
  68         return bbnsm->ops->rtc_alarm_set(ph, 0, true, val);
  69 }
  70
  71 static const struct rtc_class_ops smci_imx_bbm_rtc_ops = {
  72         .read_time = scmi_imx_bbm_read_time,
  73         .set_time = scmi_imx_bbm_set_time,
  74         .set_alarm = scmi_imx_bbm_set_alarm,
  75         .alarm_irq_enable = scmi_imx_bbm_alarm_irq_enable,
  76 };
  77
  78 static int scmi_imx_bbm_rtc_notifier(struct notifier_block *nb, unsigned long event, void *data)
  79 {
  80         struct scmi_imx_bbm *bbnsm = container_of(nb, struct scmi_imx_bbm, nb);
  81         struct scmi_imx_bbm_notif_report *r = data;
  82
  83         if (r->is_rtc)
  84                 rtc_update_irq(bbnsm->rtc_dev, 1, RTC_AF | RTC_IRQF);
  85         else
  86                 pr_err("Unexpected bbm event: %s\n", __func__);
  87
  88         return 0;
  89 }
  90
  91 static int scmi_imx_bbm_rtc_init(struct scmi_device *sdev)
  92 {
  93         const struct scmi_handle *handle = sdev->handle;
  94         struct device *dev = &sdev->dev;
  95         struct scmi_imx_bbm *bbnsm = dev_get_drvdata(dev);
  96         int ret;
  97
  98         bbnsm->rtc_dev = devm_rtc_allocate_device(dev);
  99         if (IS_ERR(bbnsm->rtc_dev))
 100                 return PTR_ERR(bbnsm->rtc_dev);
 101
 102         bbnsm->rtc_dev->ops = &smci_imx_bbm_rtc_ops;
 103         bbnsm->rtc_dev->range_max = U32_MAX;
 104
 105         bbnsm->nb.notifier_call = &scmi_imx_bbm_rtc_notifier;
 106         ret = handle->notify_ops->devm_event_notifier_register(sdev, SCMI_PROTOCOL_IMX_BBM,
 107                                                                SCMI_EVENT_IMX_BBM_RTC,
 108                                                                NULL, &bbnsm->nb);
 109         if (ret)
 110                 return ret;
 111
 112         return devm_rtc_register_device(bbnsm->rtc_dev);
 113 }
 114
 115 static int scmi_imx_bbm_rtc_probe(struct scmi_device *sdev)
 116 {
 117         const struct scmi_handle *handle = sdev->handle;
 118         struct device *dev = &sdev->dev;
 119         struct scmi_protocol_handle *ph;
 120         struct scmi_imx_bbm *bbnsm;
 121         int ret;
 122
 123         if (!handle)
 124                 return -ENODEV;
 125
 126         bbnsm = devm_kzalloc(dev, sizeof(*bbnsm), GFP_KERNEL);
 127         if (!bbnsm)
 128                 return -ENOMEM;
 129
 130         bbnsm->ops = handle->devm_protocol_get(sdev, SCMI_PROTOCOL_IMX_BBM, &ph);
 131         if (IS_ERR(bbnsm->ops))
 132                 return PTR_ERR(bbnsm->ops);
 133
 134         bbnsm->ph = ph;
 135
 136         device_init_wakeup(dev, true);
 137
 138         dev_set_drvdata(dev, bbnsm);
 139
 140         ret = scmi_imx_bbm_rtc_init(sdev);
 141         if (ret)
 142                 device_init_wakeup(dev, false);
 143
 144         return ret;
 145 }
 146
 147 static const struct scmi_device_id scmi_id_table[] = {
 148         { SCMI_PROTOCOL_IMX_BBM, "imx-bbm-rtc" },
 149         { },
 150 };
 151 MODULE_DEVICE_TABLE(scmi, scmi_id_table);
 152
 153 static struct scmi_driver scmi_imx_bbm_rtc_driver = {
 154         .name = "scmi-imx-bbm-rtc",
 155         .probe = scmi_imx_bbm_rtc_probe,
 156         .id_table = scmi_id_table,
 157 };
 158 module_scmi_driver(scmi_imx_bbm_rtc_driver);
 159
 160 MODULE_AUTHOR("Peng Fan <[email protected]>");
 161 MODULE_DESCRIPTION("IMX SM BBM RTC driver");
 162 MODULE_LICENSE("GPL");