1 // SPDX-License-Identifier: GPL-2.0-or-later
23 #include <linux/w1.h>
58  * Using tristate pins, since i can't find any open-drain pin in whole motherboard.
60  * since we don't know motherboard schema, which has pretty unused(may be not) GPIO.
70 	writeb(reg, dev->port_index);  in matrox_w1_read_reg()
71 	ret = readb(dev->port_data);  in matrox_w1_read_reg()
79 	writeb(reg, dev->port_index);  in matrox_w1_write_reg()
80 	writeb(val, dev->port_data);  in matrox_w1_write_reg()
92 		bit = dev->data_mask;  in matrox_w1_write_ddc_bit()
95 	matrox_w1_write_reg(dev, MATROX_GET_CONTROL, ((ret & ~dev->data_mask) | bit));  in matrox_w1_write_ddc_bit()
120 	if (pdev->vendor != PCI_VENDOR_ID_MATROX || pdev->device != PCI_DEVICE_ID_MATROX_G400)  in matrox_w1_probe()
121 		return -ENODEV;  in matrox_w1_probe()
126 		return -ENOMEM;  in matrox_w1_probe()
128 	dev->bus_master = (struct w1_bus_master *)(dev + 1);  in matrox_w1_probe()
134 	dev->phys_addr = pci_resource_start(pdev, 1);  in matrox_w1_probe()
136 	dev->virt_addr = ioremap(dev->phys_addr, 16384);  in matrox_w1_probe()
137 	if (!dev->virt_addr) {  in matrox_w1_probe()
138 		dev_err(&pdev->dev, "%s: failed to ioremap(0x%lx, %d).\n",  in matrox_w1_probe()
139 			__func__, dev->phys_addr, 16384);  in matrox_w1_probe()
140 		err = -EIO;  in matrox_w1_probe()
144 	dev->base_addr = dev->virt_addr + MATROX_BASE;  in matrox_w1_probe()
145 	dev->port_index = dev->base_addr + MATROX_PORT_INDEX_OFFSET;  in matrox_w1_probe()
146 	dev->port_data = dev->base_addr + MATROX_PORT_DATA_OFFSET;  in matrox_w1_probe()
147 	dev->data_mask = (MATROX_G400_DDC_DATA);  in matrox_w1_probe()
151 	dev->bus_master->data = dev;  in matrox_w1_probe()
152 	dev->bus_master->read_bit = &matrox_w1_read_ddc_bit;  in matrox_w1_probe()
153 	dev->bus_master->write_bit = &matrox_w1_write_ddc_bit;  in matrox_w1_probe()
155 	err = w1_add_master_device(dev->bus_master);  in matrox_w1_probe()
161 	dev->found = 1;  in matrox_w1_probe()
163 	dev_info(&pdev->dev, "Matrox G400 GPIO transport layer for 1-wire.\n");  in matrox_w1_probe()
168 	if (dev->virt_addr)  in matrox_w1_probe()
169 		iounmap(dev->virt_addr);  in matrox_w1_probe()
179 	if (dev->found) {  in matrox_w1_remove()
180 		w1_remove_master_device(dev->bus_master);  in matrox_w1_remove()
181 		iounmap(dev->virt_addr);  in matrox_w1_remove()
201 MODULE_DESCRIPTION("Driver for transport(Dallas 1-wire protocol) over VGA DDC(matrox gpio).");