1 // SPDX-License-Identifier: GPL-2.0
27 /* ------------------------------------------------------------------------ */
30 #define KS8995_REG_ID1		0x01    /* Chip ID1 */
180 /* create_spi_cmd - create a chip specific SPI command header
197 	result <<= ks->chip->addr_width + ks->chip->addr_shift;  in create_spi_cmd()
199 	result |= address << ks->chip->addr_shift;  in create_spi_cmd()
203 /* ------------------------------------------------------------------------ */
225 	mutex_lock(&ks->lock);  in ks8995_read()
226 	err = spi_sync(ks->spi, &m);  in ks8995_read()
227 	mutex_unlock(&ks->lock);  in ks8995_read()
253 	mutex_lock(&ks->lock);  in ks8995_write()
254 	err = spi_sync(ks->spi, &m);  in ks8995_write()
255 	mutex_unlock(&ks->lock);  in ks8995_write()
272 /* ------------------------------------------------------------------------ */
321 /* ks8995_get_revision - get chip revision
324  * Verify chip family and id and get chip revision.
329 	u8 id0, id1, ksz8864_id;  in ks8995_get_revision()  local
334 		err = -EIO;  in ks8995_get_revision()
339 	if (id0 != ks->chip->family_id) {  in ks8995_get_revision()
340 		dev_err(&ks->spi->dev, "chip family id mismatch: expected 0x%02x but 0x%02x read\n",  in ks8995_get_revision()
341 			ks->chip->family_id, id0);  in ks8995_get_revision()
342 		err = -ENODEV;  in ks8995_get_revision()
346 	switch (ks->chip->family_id) {  in ks8995_get_revision()
348 		/* try reading chip id at CHIP ID1 */  in ks8995_get_revision()
349 		err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);  in ks8995_get_revision()
351 			err = -EIO;  in ks8995_get_revision()
356 		if ((get_chip_id(id1) == CHIPID_M) &&  in ks8995_get_revision()
357 		    (get_chip_id(id1) == ks->chip->chip_id)) {  in ks8995_get_revision()
359 			ks->revision_id = get_chip_rev(id1);  in ks8995_get_revision()
360 		} else if (get_chip_id(id1) != CHIPID_M) {  in ks8995_get_revision()
364 				err = -EIO;  in ks8995_get_revision()
369 			    (ks->chip->chip_id == KSZ8864_CHIP_ID)) {  in ks8995_get_revision()
370 				ks->revision_id = get_chip_rev(id1);  in ks8995_get_revision()
374 			dev_err(&ks->spi->dev, "unsupported chip id for KS8995 family: 0x%02x\n",  in ks8995_get_revision()
375 				id1);  in ks8995_get_revision()
376 			err = -ENODEV;  in ks8995_get_revision()
380 		/* try reading chip id at CHIP ID1 */  in ks8995_get_revision()
381 		err = ks8995_read_reg(ks, KS8995_REG_ID1, &id1);  in ks8995_get_revision()
383 			err = -EIO;  in ks8995_get_revision()
387 		if (get_chip_id(id1) == ks->chip->chip_id) {  in ks8995_get_revision()
388 			ks->revision_id = get_chip_rev(id1);  in ks8995_get_revision()
390 			dev_err(&ks->spi->dev, "unsupported chip id for KSZ8795 family: 0x%02x\n",  in ks8995_get_revision()
391 				id1);  in ks8995_get_revision()
392 			err = -ENODEV;  in ks8995_get_revision()
396 		dev_err(&ks->spi->dev, "unsupported family id: 0x%02x\n", id0);  in ks8995_get_revision()
397 		err = -ENODEV;  in ks8995_get_revision()
404 /* ks8995_parse_dt - setup platform data from devicetree
412 	struct device_node *np = ks->spi->dev.of_node;  in ks8995_parse_dt()
413 	struct ks8995_pdata *pdata = ks->pdata;  in ks8995_parse_dt()
418 	pdata->reset_gpio = of_get_named_gpio_flags(np, "reset-gpios", 0,  in ks8995_parse_dt()
419 		&pdata->reset_gpio_flags);  in ks8995_parse_dt()
432 /* ------------------------------------------------------------------------ */
437 	int variant = spi_get_device_id(spi)->driver_data;  in ks8995_probe()
440 		dev_err(&spi->dev, "bad chip variant %d\n", variant);  in ks8995_probe()
441 		return -ENODEV;  in ks8995_probe()
444 	ks = devm_kzalloc(&spi->dev, sizeof(*ks), GFP_KERNEL);  in ks8995_probe()
446 		return -ENOMEM;  in ks8995_probe()
448 	mutex_init(&ks->lock);  in ks8995_probe()
449 	ks->spi = spi;  in ks8995_probe()
450 	ks->chip = &ks8995_chip[variant];  in ks8995_probe()
452 	if (ks->spi->dev.of_node) {  in ks8995_probe()
453 		ks->pdata = devm_kzalloc(&spi->dev, sizeof(*ks->pdata),  in ks8995_probe()
455 		if (!ks->pdata)  in ks8995_probe()
456 			return -ENOMEM;  in ks8995_probe()
458 		ks->pdata->reset_gpio = -1;  in ks8995_probe()
463 	if (!ks->pdata)  in ks8995_probe()
464 		ks->pdata = spi->dev.platform_data;  in ks8995_probe()
466 	/* de-assert switch reset */  in ks8995_probe()
467 	if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio)) {  in ks8995_probe()
470 		flags = (ks->pdata->reset_gpio_flags == OF_GPIO_ACTIVE_LOW ?  in ks8995_probe()
473 		err = devm_gpio_request_one(&spi->dev,  in ks8995_probe()
474 					    ks->pdata->reset_gpio,  in ks8995_probe()
475 					    flags, "switch-reset");  in ks8995_probe()
477 			dev_err(&spi->dev,  in ks8995_probe()
478 				"failed to get reset-gpios: %d\n", err);  in ks8995_probe()
479 			return -EIO;  in ks8995_probe()
482 		gpiod_set_value(gpio_to_desc(ks->pdata->reset_gpio), 0);  in ks8995_probe()
487 	spi->mode = SPI_MODE_0;  in ks8995_probe()
488 	spi->bits_per_word = 8;  in ks8995_probe()
491 		dev_err(&spi->dev, "spi_setup failed, err=%d\n", err);  in ks8995_probe()
499 	memcpy(&ks->regs_attr, &ks8995_registers_attr, sizeof(ks->regs_attr));  in ks8995_probe()
500 	ks->regs_attr.size = ks->chip->regs_size;  in ks8995_probe()
506 	sysfs_attr_init(&ks->regs_attr.attr);  in ks8995_probe()
507 	err = sysfs_create_bin_file(&spi->dev.kobj, &ks->regs_attr);  in ks8995_probe()
509 		dev_err(&spi->dev, "unable to create sysfs file, err=%d\n",  in ks8995_probe()
514 	dev_info(&spi->dev, "%s device found, Chip ID:%x, Revision:%x\n",  in ks8995_probe()
515 		 ks->chip->name, ks->chip->chip_id, ks->revision_id);  in ks8995_probe()
524 	sysfs_remove_bin_file(&spi->dev.kobj, &ks->regs_attr);  in ks8995_remove()
527 	if (ks->pdata && gpio_is_valid(ks->pdata->reset_gpio))  in ks8995_remove()
528 		gpiod_set_value(gpio_to_desc(ks->pdata->reset_gpio), 1);  in ks8995_remove()
533 /* ------------------------------------------------------------------------ */
536 		.name	    = "spi-ks8995",