1 // SPDX-License-Identifier: GPL-2.0-only
10    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>,
29 MODULE_DESCRIPTION("NatSemi/Winbond PC-8736x GPIO Pin Driver");
40 #define SIO_BASE1       0x2E	/* 1st command-reg to check */
41 #define SIO_BASE2       0x4E	/* alt command-reg to check */
47 #define SIO_CF1		0x21	/* chip config, bit0 is chip enable */
58 /* config-space addrs to read/write each unit's runtime addr */
62 /* GPIO config-space pin-control addresses */
70 /* GPIO port runtime access, functionality */
71 static int port_offset[] = { 0, 4, 8, 10 };	/* non-uniform offsets ! */
119 	/* select GPIO port/pin from device minor number */  in select_pin()
128 	u32 config, new_config;  in pc8736x_gpio_configure_fn()  local
135 	/* read current config value */  in pc8736x_gpio_configure_fn()
136 	config = superio_inb(func_slct);  in pc8736x_gpio_configure_fn()
138 	/* set new config */  in pc8736x_gpio_configure_fn()
139 	new_config = (config & mask) | bits;  in pc8736x_gpio_configure_fn()
144 	return config;  in pc8736x_gpio_configure_fn()
155 	int port, bit, val;  in pc8736x_gpio_get()  local
157 	port = minor >> 3;  in pc8736x_gpio_get()
159 	val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN);  in pc8736x_gpio_get()
163 	dev_dbg(&pdev->dev, "_gpio_get(%d from %x bit %d) == val %d\n",  in pc8736x_gpio_get()
164 		minor, pc8736x_gpio_base + port_offset[port] + PORT_IN, bit,  in pc8736x_gpio_get()
172 	int port, bit, curval;  in pc8736x_gpio_set()  local
175 	port = minor >> 3;  in pc8736x_gpio_set()
177 	curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);  in pc8736x_gpio_set()
179 	dev_dbg(&pdev->dev, "addr:%x cur:%x bit-pos:%d cur-bit:%x + new:%d -> bit-new:%d\n",  in pc8736x_gpio_set()
180 		pc8736x_gpio_base + port_offset[port] + PORT_OUT,  in pc8736x_gpio_set()
185 	dev_dbg(&pdev->dev, "gpio_set(minor:%d port:%d bit:%d)"  in pc8736x_gpio_set()
186 		" %2x -> %2x\n", minor, port, bit, curval, val);  in pc8736x_gpio_set()
188 	outb_p(val, pc8736x_gpio_base + port_offset[port] + PORT_OUT);  in pc8736x_gpio_set()
190 	curval = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_OUT);  in pc8736x_gpio_set()
191 	val = inb_p(pc8736x_gpio_base + port_offset[port] + PORT_IN);  in pc8736x_gpio_set()
193 	dev_dbg(&pdev->dev, "wrote %x, read: %x\n", curval, val);  in pc8736x_gpio_set()
194 	pc8736x_gpio_shadow[port] = val;  in pc8736x_gpio_set()
199 	int port, bit;  in pc8736x_gpio_current()  local
201 	port = minor >> 3;  in pc8736x_gpio_current()
203 	return ((pc8736x_gpio_shadow[port] >> bit) & 0x01);  in pc8736x_gpio_current()
224 	file->private_data = &pc8736x_gpio_ops;  in pc8736x_gpio_open()
226 	dev_dbg(&pdev->dev, "open %d\n", m);  in pc8736x_gpio_open()
229 		return -EINVAL;  in pc8736x_gpio_open()
242 	int port;  in pc8736x_init_shadow()  local
245 	for (port = 0; port < 4; ++port)  in pc8736x_init_shadow()
246 		pc8736x_gpio_shadow[port]  in pc8736x_init_shadow()
247 		    = inb_p(pc8736x_gpio_base + port_offset[port]  in pc8736x_init_shadow()
261 		return -ENOMEM;  in pc8736x_gpio_init()
265 		rc = -ENODEV;  in pc8736x_gpio_init()
268 	dev_info(&pdev->dev, "NatSemi pc8736x GPIO Driver Initializing\n");  in pc8736x_gpio_init()
271 		rc = -ENODEV;  in pc8736x_gpio_init()
272 		dev_err(&pdev->dev, "no device found\n");  in pc8736x_gpio_init()
275 	pc8736x_gpio_ops.dev = &pdev->dev;  in pc8736x_gpio_init()
282 		rc = -ENODEV;  in pc8736x_gpio_init()
283 		dev_err(&pdev->dev, "device not enabled\n");  in pc8736x_gpio_init()
288 		rc = -ENODEV;  in pc8736x_gpio_init()
289 		dev_err(&pdev->dev, "GPIO unit not enabled\n");  in pc8736x_gpio_init()
298 		rc = -ENODEV;  in pc8736x_gpio_init()
299 		dev_err(&pdev->dev, "GPIO ioport %x busy\n",  in pc8736x_gpio_init()
303 	dev_info(&pdev->dev, "GPIO ioport %x reserved\n", pc8736x_gpio_base);  in pc8736x_gpio_init()
314 		dev_err(&pdev->dev, "register-chrdev failed: %d\n", rc);  in pc8736x_gpio_init()
319 		dev_dbg(&pdev->dev, "got dynamic major %d\n", major);  in pc8736x_gpio_init()
342 	dev_dbg(&pdev->dev, "cleanup\n");  in pc8736x_gpio_cleanup()