4  * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
5  * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
8  * chips made by NXP Semiconductors.
14  * single 8-bit register. The upstream "parent" bus fans out to two,
17  * mux can select only one sub-bus at a time; a switch can select any
29  *	i2c-virtual_cb.c from Brian Kuschak <bkuschak@yahoo.com>
42 #include <linux/i2c-mux.h>
201 	{ .compatible = "nxp,pca9540", .data = &chips[pca_9540] },
202 	{ .compatible = "nxp,pca9542", .data = &chips[pca_9542] },
203 	{ .compatible = "nxp,pca9543", .data = &chips[pca_9543] },
204 	{ .compatible = "nxp,pca9544", .data = &chips[pca_9544] },
205 	{ .compatible = "nxp,pca9545", .data = &chips[pca_9545] },
206 	{ .compatible = "nxp,pca9546", .data = &chips[pca_9546] },
207 	{ .compatible = "nxp,pca9547", .data = &chips[pca_9547] },
208 	{ .compatible = "nxp,pca9548", .data = &chips[pca_9548] },
209 	{ .compatible = "nxp,pca9846", .data = &chips[pca_9846] },
210 	{ .compatible = "nxp,pca9847", .data = &chips[pca_9847] },
211 	{ .compatible = "nxp,pca9848", .data = &chips[pca_9848] },
212 	{ .compatible = "nxp,pca9849", .data = &chips[pca_9849] },
225 	return __i2c_smbus_xfer(adap, client->addr, client->flags,  in pca954x_reg_write()
233 	struct i2c_client *client = data->client;  in pca954x_select_chan()
234 	const struct chip_desc *chip = data->chip;  in pca954x_select_chan()
239 	if (chip->muxtype == pca954x_ismux)  in pca954x_select_chan()
240 		regval = chan | chip->enable;  in pca954x_select_chan()
245 	if (data->last_chan != regval) {  in pca954x_select_chan()
246 		ret = pca954x_reg_write(muxc->parent, client, regval);  in pca954x_select_chan()
247 		data->last_chan = ret < 0 ? 0 : regval;  in pca954x_select_chan()
256 	struct i2c_client *client = data->client;  in pca954x_deselect_mux()
258 	if (!(data->deselect & (1 << chan)))  in pca954x_deselect_mux()
262 	data->last_chan = 0;  in pca954x_deselect_mux()
263 	return pca954x_reg_write(muxc->parent, client, data->last_chan);  in pca954x_deselect_mux()
270 	int ret, i, handled = 0;  in pca954x_irq_handler()  local
272 	ret = i2c_smbus_read_byte(data->client);  in pca954x_irq_handler()
276 	for (i = 0; i < data->chip->nchans; i++) {  in pca954x_irq_handler()
277 		if (ret & BIT(PCA954X_IRQ_OFFSET + i)) {  in pca954x_irq_handler()
278 			child_irq = irq_linear_revmap(data->irq, i);  in pca954x_irq_handler()
289 		return -EINVAL;  in pca954x_irq_set_type()
294 	.name = "i2c-mux-pca954x",
301 	struct i2c_client *client = data->client;  in pca954x_irq_setup()
304 	if (!data->chip->has_irq || client->irq <= 0)  in pca954x_irq_setup()
307 	raw_spin_lock_init(&data->lock);  in pca954x_irq_setup()
309 	data->irq = irq_domain_add_linear(client->dev.of_node,  in pca954x_irq_setup()
310 					  data->chip->nchans,  in pca954x_irq_setup()
312 	if (!data->irq)  in pca954x_irq_setup()
313 		return -ENODEV;  in pca954x_irq_setup()
315 	for (c = 0; c < data->chip->nchans; c++) {  in pca954x_irq_setup()
316 		irq = irq_create_mapping(data->irq, c);  in pca954x_irq_setup()
318 			dev_err(&client->dev, "failed irq create map\n");  in pca954x_irq_setup()
319 			return -EINVAL;  in pca954x_irq_setup()
334 	if (data->irq) {  in pca954x_cleanup()
335 		for (c = 0; c < data->chip->nchans; c++) {  in pca954x_cleanup()
336 			irq = irq_find_mapping(data->irq, c);  in pca954x_cleanup()
339 		irq_domain_remove(data->irq);  in pca954x_cleanup()
350 	struct i2c_adapter *adap = to_i2c_adapter(client->dev.parent);  in pca954x_probe()
351 	struct pca954x_platform_data *pdata = dev_get_platdata(&client->dev);  in pca954x_probe()
352 	struct device *dev = &client->dev;  in pca954x_probe()
353 	struct device_node *np = dev->of_node;  in pca954x_probe()
362 		return -ENODEV;  in pca954x_probe()
367 		return -ENOMEM;  in pca954x_probe()
371 	data->client = client;  in pca954x_probe()
384 	data->chip = of_device_get_match_data(dev);  in pca954x_probe()
385 	if (!data->chip)  in pca954x_probe()
386 		data->chip = &chips[id->driver_data];  in pca954x_probe()
388 	if (data->chip->id.manufacturer_id != I2C_DEVICE_ID_NONE) {  in pca954x_probe()
392 		if (ret && ret != -EOPNOTSUPP)  in pca954x_probe()
396 		    (id.manufacturer_id != data->chip->id.manufacturer_id ||  in pca954x_probe()
397 		     id.part_id != data->chip->id.part_id)) {  in pca954x_probe()
398 			dev_warn(dev, "unexpected device id %03x-%03x-%x\n",  in pca954x_probe()
401 			return -ENODEV;  in pca954x_probe()
411 		return -ENODEV;  in pca954x_probe()
414 	data->last_chan = 0;		   /* force the first selection */  in pca954x_probe()
417 		of_property_read_bool(np, "i2c-mux-idle-disconnect");  in pca954x_probe()
424 	for (num = 0; num < data->chip->nchans; num++) {  in pca954x_probe()
430 			if (num < pdata->num_modes) {  in pca954x_probe()
432 				force = pdata->modes[num].adap_id;  in pca954x_probe()
433 				class = pdata->modes[num].class;  in pca954x_probe()
437 			idle_disconnect_pd = pdata->modes[num].deselect_on_exit;  in pca954x_probe()
439 		data->deselect |= (idle_disconnect_pd ||  in pca954x_probe()
447 	if (data->irq) {  in pca954x_probe()
448 		ret = devm_request_threaded_irq(dev, data->client->irq,  in pca954x_probe()
457 		 num, data->chip->muxtype == pca954x_ismux  in pca954x_probe()
458 				? "mux" : "switch", client->name);  in pca954x_probe()
482 	data->last_chan = 0;  in pca954x_resume()