1 // SPDX-License-Identifier: GPL-2.0-or-later
7  * Copyright (C) 2011-2012 One Laptop per Child Foundation.
18 #include <linux/regulator/driver.h>
19 #include <linux/olpc-ec.h>
39 	/* DCON regulator */
84 	spin_lock_irqsave(&ec->cmd_q_lock, flags);  in olpc_ec_worker()
85 	if (!list_empty(&ec->cmd_q)) {  in olpc_ec_worker()
86 		desc = list_first_entry(&ec->cmd_q, struct ec_cmd_desc, node);  in olpc_ec_worker()
87 		list_del(&desc->node);  in olpc_ec_worker()
89 	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);  in olpc_ec_worker()
96 	mutex_lock(&ec->cmd_lock);  in olpc_ec_worker()
97 	desc->err = ec_driver->ec_cmd(desc->cmd, desc->inbuf, desc->inlen,  in olpc_ec_worker()
98 			desc->outbuf, desc->outlen, ec_cb_arg);  in olpc_ec_worker()
99 	mutex_unlock(&ec->cmd_lock);  in olpc_ec_worker()
102 	complete(&desc->finished);  in olpc_ec_worker()
105 	schedule_work(&ec->worker);  in olpc_ec_worker()
110  * locking is pretty critical.
117 	INIT_LIST_HEAD(&desc->node);  in queue_ec_descriptor()
119 	spin_lock_irqsave(&ec->cmd_q_lock, flags);  in queue_ec_descriptor()
120 	list_add_tail(&desc->node, &ec->cmd_q);  in queue_ec_descriptor()
121 	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);  in queue_ec_descriptor()
123 	schedule_work(&ec->worker);  in queue_ec_descriptor()
133 		return -EPROBE_DEFER;  in olpc_ec_cmd()
135 	if (WARN_ON(!ec_driver->ec_cmd))  in olpc_ec_cmd()
136 		return -ENODEV;  in olpc_ec_cmd()
139 		return -ENOMEM;  in olpc_ec_cmd()
142 	if (WARN_ON(ec->suspended))  in olpc_ec_cmd()
143 		return -EBUSY;  in olpc_ec_cmd()
157 	/* Timeouts must be handled in the platform-specific EC hook */  in olpc_ec_cmd()
172 	ec->ec_wakeup_mask |= value;  in olpc_ec_wakeup_set()
183 	ec->ec_wakeup_mask &= ~value;  in olpc_ec_wakeup_clear()
192 		return -ENODEV;  in olpc_ec_mask_write()
195 	if (ec->version >= 0x5f) {  in olpc_ec_mask_write()
209  * to wake the system.
216 	return ec_driver->wakeup_available;  in olpc_ec_wakeup_available()
226 		return -ENODEV;  in olpc_ec_sci_query()
229 	if (ec->version >= 0x5f) {  in olpc_ec_sci_query()
281 		pr_debug("olpc-ec: bad ec cmd:  cmd:response-count [arg1 [arg2 ...]]\n");  in ec_dbgfs_cmd_write()
282 		size = -EINVAL;  in ec_dbgfs_cmd_write()
287 	ec_cmd_bytes = m - 2;  in ec_dbgfs_cmd_write()
291 	pr_debug("olpc-ec: debugfs cmd 0x%02x with %d args %5ph, want %d returns\n",  in ec_dbgfs_cmd_write()
298 	pr_debug("olpc-ec: response %8ph (%d bytes expected)\n",  in ec_dbgfs_cmd_write()
321 	r = rp - respbuf;  in ec_dbgfs_cmd_read()
334 	dbgfs_dir = debugfs_create_dir("olpc-ec", NULL);  in olpc_ec_setup_debugfs()
354 	if (ec->dcon_enabled == state)  in olpc_ec_set_dcon_power()
361 	ec->dcon_enabled = state;  in olpc_ec_set_dcon_power()
383 	return ec->dcon_enabled ? 1 : 0;  in dcon_regulator_is_enabled()
405 	struct regulator_dev *regulator;  in olpc_ec_probe()  local
409 		return -ENODEV;  in olpc_ec_probe()
413 		return -ENOMEM;  in olpc_ec_probe()
415 	ec->drv = ec_driver;  in olpc_ec_probe()
416 	INIT_WORK(&ec->worker, olpc_ec_worker);  in olpc_ec_probe()
417 	mutex_init(&ec->cmd_lock);  in olpc_ec_probe()
419 	INIT_LIST_HEAD(&ec->cmd_q);  in olpc_ec_probe()
420 	spin_lock_init(&ec->cmd_q_lock);  in olpc_ec_probe()
426 	err = olpc_ec_cmd(EC_FIRMWARE_REV, NULL, 0, &ec->version, 1);  in olpc_ec_probe()
430 	config.dev = pdev->dev.parent;  in olpc_ec_probe()
432 	ec->dcon_enabled = true;  in olpc_ec_probe()
433 	regulator = devm_regulator_register(&pdev->dev, &dcon_desc, &config);  in olpc_ec_probe()
434 	if (IS_ERR(regulator)) {  in olpc_ec_probe()
435 		dev_err(&pdev->dev, "failed to register DCON regulator\n");  in olpc_ec_probe()
436 		err = PTR_ERR(regulator);  in olpc_ec_probe()
440 	ec->dbgfs_dir = olpc_ec_setup_debugfs();  in olpc_ec_probe()
456 	olpc_ec_mask_write(ec->ec_wakeup_mask);  in olpc_ec_suspend()
458 	if (ec_driver->suspend)  in olpc_ec_suspend()
459 		err = ec_driver->suspend(pdev);  in olpc_ec_suspend()
461 		ec->suspended = true;  in olpc_ec_suspend()
471 	ec->suspended = false;  in olpc_ec_resume()
472 	return ec_driver->resume ? ec_driver->resume(pdev) : 0;  in olpc_ec_resume()
483 		.name = "olpc-ec",