1 // SPDX-License-Identifier: GPL-2.0-only
4    National Semiconductor common GPIO device-file/VFS methods.
5    Allows a user space process to control the GPIO pins.
7    Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
25 	/* retrieve current config w/o changing it */  in nsc_gpio_dump()
26 	u32 config = amp->gpio_config(index, ~0, 0);  in nsc_gpio_dump()  local
29 	dev_info(amp->dev, "io%02u: 0x%04x %s %s %s %s %s %s %s\tio:%d/%d\n",  in nsc_gpio_dump()
30 		 index, config,  in nsc_gpio_dump()
31 		 (config & 1) ? "OE" : "TS",      /* output-enabled/tristate */  in nsc_gpio_dump()
32 		 (config & 2) ? "PP" : "OD",      /* push pull / open drain */  in nsc_gpio_dump()
33 		 (config & 4) ? "PUE" : "PUD",    /* pull up enabled/disabled */  in nsc_gpio_dump()
34 		 (config & 8) ? "LOCKED" : "",    /* locked / unlocked */  in nsc_gpio_dump()
35 		 (config & 16) ? "LEVEL" : "EDGE",/* level/edge input */  in nsc_gpio_dump()
36 		 (config & 32) ? "HI" : "LO",     /* trigger on rise/fall edge */  in nsc_gpio_dump()
37 		 (config & 64) ? "DEBOUNCE" : "", /* debounce */  in nsc_gpio_dump()
39 		 amp->gpio_get(index), amp->gpio_current(index));  in nsc_gpio_dump()
46 	struct nsc_gpio_ops *amp = file->private_data;  in nsc_gpio_write()
47 	struct device *dev = amp->dev;  in nsc_gpio_write()
54 			return -EFAULT;  in nsc_gpio_write()
57 			amp->gpio_set(m, 0);  in nsc_gpio_write()
60 			amp->gpio_set(m, 1);  in nsc_gpio_write()
63 			dev_dbg(dev, "GPIO%d output enabled\n", m);  in nsc_gpio_write()
64 			amp->gpio_config(m, ~1, 1);  in nsc_gpio_write()
67 			dev_dbg(dev, "GPIO%d output disabled\n", m);  in nsc_gpio_write()
68 			amp->gpio_config(m, ~1, 0);  in nsc_gpio_write()
71 			dev_dbg(dev, "GPIO%d output is push pull\n", m);  in nsc_gpio_write()
72 			amp->gpio_config(m, ~2, 2);  in nsc_gpio_write()
75 			dev_dbg(dev, "GPIO%d output is open drain\n", m);  in nsc_gpio_write()
76 			amp->gpio_config(m, ~2, 0);  in nsc_gpio_write()
79 			dev_dbg(dev, "GPIO%d pull up enabled\n", m);  in nsc_gpio_write()
80 			amp->gpio_config(m, ~4, 4);  in nsc_gpio_write()
83 			dev_dbg(dev, "GPIO%d pull up disabled\n", m);  in nsc_gpio_write()
84 			amp->gpio_config(m, ~4, 0);  in nsc_gpio_write()
88 			amp->gpio_dump(amp, m);  in nsc_gpio_write()
100 		return -EINVAL;	/* full string handled, report error */  in nsc_gpio_write()
110 	struct nsc_gpio_ops *amp = file->private_data;  in nsc_gpio_read()
112 	value = amp->gpio_get(m);  in nsc_gpio_read()
114 		return -EFAULT;  in nsc_gpio_read()
119 /* common file-ops routines for both scx200_gpio and pc87360_gpio */
139 MODULE_DESCRIPTION("NatSemi GPIO Common Methods");