1 // SPDX-License-Identifier: GPL-2.0
3  * I2C driver for stand-alone PCF8584 style adapters on Zorro cards
8  * There has been a modern community re-print of this design in 2019:
11  * The card is basically a Philips PCF8584 connected straight to the
17  * This started as a fork of i2c-elektor.c and has evolved since.
18  * Thanks go to its authors for providing a base to grow on.
23  * As it turns out, i2c-algo-pcf is really written with i2c-elektor's
24  * edge-triggered ISA interrupts in mind, while the Amiga's Zorro bus has
25  * level-triggered interrupts. This means that once an interrupt occurs, we
29  * However, because of the PCF8584's host-side protocol, there is no good
32  * pin. This entails re-designing the core of i2c-algo-pcf in the future.
44 #include <linux/i2c-algo-pcf.h>
50 #include "../algos/i2c-algo-pcf.h"
61  * Functions called by i2c-algo-pcf
67 	u8 __iomem *address = ctl ? i2c->reg_s1 : i2c->reg_s0;  in icy_pcf_setpcf()
76 	u8 __iomem *address = ctl ? i2c->reg_s1 : i2c->reg_s0;  in icy_pcf_getpcf()
97  * Main i2c-icy part
108  * temp3 will be measured using a PCB loop next the chip.
113 	PROPERTY_ENTRY_U32_ARRAY("lltc,meas-mode", icy_ltc2990_meas_mode),
121 static int icy_probe(struct zorro_dev *z,  in icy_probe()  argument
131 	i2c = devm_kzalloc(&z->dev, sizeof(*i2c), GFP_KERNEL);  in icy_probe()
133 		return -ENOMEM;  in icy_probe()
135 	algo_data = devm_kzalloc(&z->dev, sizeof(*algo_data), GFP_KERNEL);  in icy_probe()
137 		return -ENOMEM;  in icy_probe()
139 	dev_set_drvdata(&z->dev, i2c);  in icy_probe()
140 	i2c->adapter.dev.parent = &z->dev;  in icy_probe()
141 	i2c->adapter.owner = THIS_MODULE;  in icy_probe()
142 	/* i2c->adapter.algo assigned by i2c_pcf_add_bus() */  in icy_probe()
143 	i2c->adapter.algo_data = algo_data;  in icy_probe()
144 	strscpy(i2c->adapter.name, "ICY I2C Zorro adapter",  in icy_probe()
145 		sizeof(i2c->adapter.name));  in icy_probe()
147 	if (!devm_request_mem_region(&z->dev,  in icy_probe()
148 				     z->resource.start,  in icy_probe()
149 				     4, i2c->adapter.name))  in icy_probe()
150 		return -ENXIO;  in icy_probe()
153 	i2c->reg_s0 = ZTWO_VADDR(z->resource.start);  in icy_probe()
154 	i2c->reg_s1 = ZTWO_VADDR(z->resource.start + 2);  in icy_probe()
156 	algo_data->data = i2c;  in icy_probe()
157 	algo_data->setpcf     = icy_pcf_setpcf;  in icy_probe()
158 	algo_data->getpcf     = icy_pcf_getpcf;  in icy_probe()
159 	algo_data->getown     = icy_pcf_getown;  in icy_probe()
160 	algo_data->getclock   = icy_pcf_getclock;  in icy_probe()
161 	algo_data->waitforpin = icy_pcf_waitforpin;  in icy_probe()
163 	if (i2c_pcf_add_bus(&i2c->adapter)) {  in icy_probe()
164 		dev_err(&z->dev, "i2c_pcf_add_bus() failed\n");  in icy_probe()
165 		return -ENXIO;  in icy_probe()
168 	dev_info(&z->dev, "ICY I2C controller at %pa, IRQ not implemented\n",  in icy_probe()
169 		 &z->resource.start);  in icy_probe()
180 	i2c->ltc2990_client = i2c_new_scanned_device(&i2c->adapter,  in icy_probe()
187 static void icy_remove(struct zorro_dev *z)  in icy_remove()  argument
189 	struct icy_i2c *i2c = dev_get_drvdata(&z->dev);  in icy_remove()
191 	i2c_unregister_device(i2c->ltc2990_client);  in icy_remove()
192 	i2c_del_adapter(&i2c->adapter);  in icy_remove()
203 	.name           = "i2c-icy",