1 // SPDX-License-Identifier: GPL-2.0
3  * CZ.NIC's Turris Omnia MCU system off and RTC wakeup driver
6  * real-time clock), rather the MCU implements a wakeup from powered off state
7  * at a specified time relative to MCU boot, and we expose this feature via RTC
25 #include <linux/turris-omnia-mcu-interface.h>
26 #include "turris-omnia-mcu.h"
65 	struct omnia_mcu *mcu = i2c_get_clientdata(client);  in omnia_read_alarm()  local
73 	alrm->enabled = !!wakeup;  in omnia_read_alarm()
74 	rtc_time64_to_tm(wakeup ?: mcu->rtc_alarm, &alrm->time);  in omnia_read_alarm()
82 	struct omnia_mcu *mcu = i2c_get_clientdata(client);  in omnia_set_alarm()  local
84 	mcu->rtc_alarm = rtc_tm_to_time64(&alrm->time);  in omnia_set_alarm()
86 	if (alrm->enabled)  in omnia_set_alarm()
88 					   mcu->rtc_alarm);  in omnia_set_alarm()
96 	struct omnia_mcu *mcu = i2c_get_clientdata(client);  in omnia_alarm_irq_enable()  local
99 				   enabled ? mcu->rtc_alarm : 0);  in omnia_alarm_irq_enable()
111 	struct omnia_mcu *mcu = data->cb_data;  in omnia_power_off()  local
117 	if (mcu->front_button_poweron)  in omnia_power_off()
127 	 * Although all values from and to MCU are passed in little-endian, the  in omnia_power_off()
128 	 * MCU's CRC unit uses big-endian CRC32 polynomial (0x04c11db7), so we  in omnia_power_off()
134 	err = omnia_cmd_write(mcu->client, cmd, sizeof(cmd));  in omnia_power_off()
136 		dev_err(&mcu->client->dev,  in omnia_power_off()
144 	struct omnia_mcu *mcu = data->cb_data;  in omnia_restart()  local
155 	err = omnia_cmd_write(mcu->client, cmd, sizeof(cmd));  in omnia_restart()
157 		dev_err(&mcu->client->dev,  in omnia_restart()
161 	 * MCU needs a little bit to process the I2C command, otherwise it will  in omnia_restart()
172 	struct omnia_mcu *mcu = dev_get_drvdata(dev);  in front_button_poweron_show()  local
174 	return sysfs_emit(buf, "%d\n", mcu->front_button_poweron);  in front_button_poweron_show()
181 	struct omnia_mcu *mcu = dev_get_drvdata(dev);  in front_button_poweron_store()  local
189 	mcu->front_button_poweron = val;  in front_button_poweron_store()
204 	struct omnia_mcu *mcu = dev_get_drvdata(dev);  in poweroff_attrs_visible()  local
206 	if (mcu->features & OMNIA_FEAT_POWEROFF_WAKEUP)  in poweroff_attrs_visible()
207 		return a->mode;  in poweroff_attrs_visible()
217 int omnia_mcu_register_sys_off_and_wakeup(struct omnia_mcu *mcu)  in omnia_mcu_register_sys_off_and_wakeup()  argument
219 	struct device *dev = &mcu->client->dev;  in omnia_mcu_register_sys_off_and_wakeup()
222 	/* MCU restart is always available */  in omnia_mcu_register_sys_off_and_wakeup()
225 					    omnia_restart, mcu);  in omnia_mcu_register_sys_off_and_wakeup()
234 	if (!(mcu->features & OMNIA_FEAT_POWEROFF_WAKEUP))  in omnia_mcu_register_sys_off_and_wakeup()
239 					    omnia_power_off, mcu);  in omnia_mcu_register_sys_off_and_wakeup()
244 	mcu->rtcdev = devm_rtc_allocate_device(dev);  in omnia_mcu_register_sys_off_and_wakeup()
245 	if (IS_ERR(mcu->rtcdev))  in omnia_mcu_register_sys_off_and_wakeup()
246 		return dev_err_probe(dev, PTR_ERR(mcu->rtcdev),  in omnia_mcu_register_sys_off_and_wakeup()
249 	mcu->rtcdev->ops = &omnia_rtc_ops;  in omnia_mcu_register_sys_off_and_wakeup()
250 	mcu->rtcdev->range_max = U32_MAX;  in omnia_mcu_register_sys_off_and_wakeup()
251 	set_bit(RTC_FEATURE_ALARM_WAKEUP_ONLY, mcu->rtcdev->features);  in omnia_mcu_register_sys_off_and_wakeup()
253 	err = devm_rtc_register_device(mcu->rtcdev);  in omnia_mcu_register_sys_off_and_wakeup()
257 	mcu->front_button_poweron = true;  in omnia_mcu_register_sys_off_and_wakeup()