mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/drivers/i2c/i2c-core.h
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@@ -1,15 +1,6 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * i2c-core.h - interfaces internal to the I2C framework
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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  */
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5
 
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 #include <linux/rwsem.h>
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@@ -28,19 +19,55 @@
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 extern int		__i2c_first_dynamic_bus_num;
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20
 
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 int i2c_check_7bit_addr_validity_strict(unsigned short addr);
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+int i2c_dev_irq_from_resources(const struct resource *resources,
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+			       unsigned int num_resources);
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+
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+/*
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+ * We only allow atomic transfers for very late communication, e.g. to access a
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+ * PMIC when powering down. Atomic transfers are a corner case and not for
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+ * generic use!
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+ */
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+static inline bool i2c_in_atomic_xfer_mode(void)
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+{
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+	return system_state > SYSTEM_RUNNING && irqs_disabled();
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+}
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+
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+static inline int __i2c_lock_bus_helper(struct i2c_adapter *adap)
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+{
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+	int ret = 0;
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+
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+	if (i2c_in_atomic_xfer_mode()) {
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+		WARN(!adap->algo->master_xfer_atomic && !adap->algo->smbus_xfer_atomic,
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+		     "No atomic I2C transfer handler for '%s'\n", dev_name(&adap->dev));
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+		ret = i2c_trylock_bus(adap, I2C_LOCK_SEGMENT) ? 0 : -EAGAIN;
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+	} else {
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+		i2c_lock_bus(adap, I2C_LOCK_SEGMENT);
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+	}
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+
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+	return ret;
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+}
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+
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+static inline int __i2c_check_suspended(struct i2c_adapter *adap)
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+{
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+	if (test_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags)) {
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+		if (!test_and_set_bit(I2C_ALF_SUSPEND_REPORTED, &adap->locked_flags))
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+			dev_WARN(&adap->dev, "Transfer while suspended\n");
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+		return -ESHUTDOWN;
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+	}
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+
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+	return 0;
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+}
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 #ifdef CONFIG_ACPI
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-const struct acpi_device_id *
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-i2c_acpi_match_device(const struct acpi_device_id *matches,
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-		      struct i2c_client *client);
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 void i2c_acpi_register_devices(struct i2c_adapter *adap);
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+
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+int i2c_acpi_get_irq(struct i2c_client *client);
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 #else /* CONFIG_ACPI */
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 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
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-static inline const struct acpi_device_id *
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-i2c_acpi_match_device(const struct acpi_device_id *matches,
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-		      struct i2c_client *client)
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+
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+static inline int i2c_acpi_get_irq(struct i2c_client *client)
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 {
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-	return NULL;
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+	return 0;
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 }
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 #endif /* CONFIG_ACPI */
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 extern struct notifier_block i2c_acpi_notifier;