1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *  i2c-pca-isa.c driver for PCA9564 on ISA boards
17 #include <linux/isa.h>
19 #include <linux/i2c-algo-pca.h>
24 #define DRIVER "i2c-pca-isa"
27 static unsigned long base;  variable
28 static int irq = -1;
42 	       base+reg, val);  in pca_isa_writebyte()
44 	outb(val, base+reg);  in pca_isa_writebyte()
49 	int res = inb(base+reg);  in pca_isa_readbyte()
64 	if (irq > -1) {  in pca_isa_waitforcompletion()
95 	/* .data intentionally left NULL, not needed with ISA */
105 	.name		= "PCA9564/PCA9665 ISA Adapter",
111 	int match = base != 0;  in pca_isa_match()
114 		if (irq <= -1)  in pca_isa_match()
117 		dev_err(dev, "Please specify I/O base\n");  in pca_isa_match()
126 	dev_info(dev, "i/o base %#08lx. irq %d\n", base, irq);  in pca_isa_probe()
129 	if (check_legacy_ioport(base)) {  in pca_isa_probe()
130 		dev_err(dev, "I/O address %#08lx is not available\n", base);  in pca_isa_probe()
135 	if (!request_region(base, IO_SIZE, "i2c-pca-isa")) {  in pca_isa_probe()
136 		dev_err(dev, "I/O address %#08lx is in use\n", base);  in pca_isa_probe()
140 	if (irq > -1) {  in pca_isa_probe()
141 		if (request_irq(irq, pca_handler, 0, "i2c-pca-isa", &pca_isa_ops) < 0) {  in pca_isa_probe()
156 	if (irq > -1)  in pca_isa_probe()
159 	release_region(base, IO_SIZE);  in pca_isa_probe()
161 	return -ENODEV;  in pca_isa_probe()
168 	if (irq > -1) {  in pca_isa_remove()
172 	release_region(base, IO_SIZE);  in pca_isa_remove()
186 MODULE_DESCRIPTION("ISA base PCA9564/PCA9665 driver");
189 module_param_hw(base, ulong, ioport, 0);
190 MODULE_PARM_DESC(base, "I/O base address");
197 		"\t\tFor PCA9665:\tStandard: 60300 - 100099\n"
198 		"\t\t\t\tFast: 100100 - 400099\n"
199 		"\t\t\t\tFast+: 400100 - 10000099\n"