1 // SPDX-License-Identifier: GPL-2.0
3  *  i2c slave support for Atmel's AT91 Two-Wire Interface (TWI)
13 #include "i2c-at91.h"
25 	/* slave address has been detected on I2C bus */  in atmel_twi_interrupt_slave()
28 			i2c_slave_event(dev->slave,  in atmel_twi_interrupt_slave()
30 			writeb_relaxed(value, dev->base + AT91_TWI_THR);  in atmel_twi_interrupt_slave()
34 			i2c_slave_event(dev->slave,  in atmel_twi_interrupt_slave()
44 		i2c_slave_event(dev->slave, I2C_SLAVE_READ_PROCESSED, &value);  in atmel_twi_interrupt_slave()
45 		writeb_relaxed(value, dev->base + AT91_TWI_THR);  in atmel_twi_interrupt_slave()
50 		value = readb_relaxed(dev->base + AT91_TWI_RHR);  in atmel_twi_interrupt_slave()
51 		i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_RECEIVED, &value);  in atmel_twi_interrupt_slave()
59 		i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &value);  in atmel_twi_interrupt_slave()
65 static int at91_reg_slave(struct i2c_client *slave)  in at91_reg_slave()  argument
67 	struct at91_twi_dev *dev = i2c_get_adapdata(slave->adapter);  in at91_reg_slave()
69 	if (dev->slave)  in at91_reg_slave()
70 		return -EBUSY;  in at91_reg_slave()
72 	if (slave->flags & I2C_CLIENT_TEN)  in at91_reg_slave()
73 		return -EAFNOSUPPORT;  in at91_reg_slave()
76 	pm_runtime_get_sync(dev->dev);  in at91_reg_slave()
78 	dev->slave = slave;  in at91_reg_slave()
79 	dev->smr = AT91_TWI_SMR_SADR(slave->addr);  in at91_reg_slave()
84 	dev_info(dev->dev, "entered slave mode (ADR=%d)\n", slave->addr);  in at91_reg_slave()
89 static int at91_unreg_slave(struct i2c_client *slave)  in at91_unreg_slave()  argument
91 	struct at91_twi_dev *dev = i2c_get_adapdata(slave->adapter);  in at91_unreg_slave()
93 	WARN_ON(!dev->slave);  in at91_unreg_slave()
95 	dev_info(dev->dev, "leaving slave mode\n");  in at91_unreg_slave()
97 	dev->slave = NULL;  in at91_unreg_slave()
98 	dev->smr = 0;  in at91_unreg_slave()
102 	pm_runtime_put(dev->dev);  in at91_unreg_slave()
124 	rc = devm_request_irq(&pdev->dev, dev->irq, atmel_twi_interrupt_slave,  in at91_twi_probe_slave()
125 			      0, dev_name(dev->dev), dev);  in at91_twi_probe_slave()
127 		dev_err(dev->dev, "Cannot get irq %d: %d\n", dev->irq, rc);  in at91_twi_probe_slave()
131 	dev->adapter.algo = &at91_twi_algorithm_slave;  in at91_twi_probe_slave()
139 	if (dev->slave_detected && dev->smr) {  in at91_init_twi_bus_slave()
140 		at91_twi_write(dev, AT91_TWI_SMR, dev->smr);  in at91_init_twi_bus_slave()