1 // SPDX-License-Identifier: GPL-2.0+
8  * COMEDI - Linux Control and Measurement Device Interface
19  * This module is not used directly by end-users.  Rather, it is used by
26  * Direction configuration is done in blocks, with channels 0-7, 8-15,
27  * 16-19, and 20-23 making up the 4 blocks.  The only 8255 mode
45 		outb(data, dev->iobase + regbase + port);  in subdev_8255_io()
48 	return inb(dev->iobase + regbase + port);  in subdev_8255_io()
55 		writeb(data, dev->mmio + regbase + port);  in subdev_8255_mmio()
58 	return readb(dev->mmio + regbase + port);  in subdev_8255_mmio()
66 	struct subdev_8255_private *spriv = s->private;  in subdev_8255_insn()
67 	unsigned long regbase = spriv->regbase;  in subdev_8255_insn()
68 	unsigned int mask;  in subdev_8255_insn()  local
71 	mask = comedi_dio_update_state(s, data);  in subdev_8255_insn()
72 	if (mask) {  in subdev_8255_insn()
73 		if (mask & 0xff)  in subdev_8255_insn()
74 			spriv->io(dev, 1, I8255_DATA_A_REG,  in subdev_8255_insn()
75 				  s->state & 0xff, regbase);  in subdev_8255_insn()
76 		if (mask & 0xff00)  in subdev_8255_insn()
77 			spriv->io(dev, 1, I8255_DATA_B_REG,  in subdev_8255_insn()
78 				  (s->state >> 8) & 0xff, regbase);  in subdev_8255_insn()
79 		if (mask & 0xff0000)  in subdev_8255_insn()
80 			spriv->io(dev, 1, I8255_DATA_C_REG,  in subdev_8255_insn()
81 				  (s->state >> 16) & 0xff, regbase);  in subdev_8255_insn()
84 	v = spriv->io(dev, 0, I8255_DATA_A_REG, 0, regbase);  in subdev_8255_insn()
85 	v |= (spriv->io(dev, 0, I8255_DATA_B_REG, 0, regbase) << 8);  in subdev_8255_insn()
86 	v |= (spriv->io(dev, 0, I8255_DATA_C_REG, 0, regbase) << 16);  in subdev_8255_insn()
90 	return insn->n;  in subdev_8255_insn()
96 	struct subdev_8255_private *spriv = s->private;  in subdev_8255_do_config()
97 	unsigned long regbase = spriv->regbase;  in subdev_8255_do_config()
102 	if (!(s->io_bits & 0x0000ff))  in subdev_8255_do_config()
104 	if (!(s->io_bits & 0x00ff00))  in subdev_8255_do_config()
106 	if (!(s->io_bits & 0x0f0000))  in subdev_8255_do_config()
108 	if (!(s->io_bits & 0xf00000))  in subdev_8255_do_config()
111 	spriv->io(dev, 1, I8255_CTRL_REG, config, regbase);  in subdev_8255_do_config()
119 	unsigned int chan = CR_CHAN(insn->chanspec);  in subdev_8255_insn_config()
120 	unsigned int mask;  in subdev_8255_insn_config()  local
124 		mask = 0x0000ff;  in subdev_8255_insn_config()
126 		mask = 0x00ff00;  in subdev_8255_insn_config()
128 		mask = 0x0f0000;  in subdev_8255_insn_config()
130 		mask = 0xf00000;  in subdev_8255_insn_config()
132 	ret = comedi_dio_insn_config(dev, s, insn, data, mask);  in subdev_8255_insn_config()
138 	return insn->n;  in subdev_8255_insn_config()
153 		return -ENOMEM;  in __subdev_8255_init()
156 		spriv->io = io;  in __subdev_8255_init()
158 		spriv->io = subdev_8255_mmio;  in __subdev_8255_init()
160 		spriv->io = subdev_8255_io;  in __subdev_8255_init()
161 	spriv->regbase	= regbase;  in __subdev_8255_init()
163 	s->type		= COMEDI_SUBD_DIO;  in __subdev_8255_init()
164 	s->subdev_flags	= SDF_READABLE | SDF_WRITABLE;  in __subdev_8255_init()
165 	s->n_chan	= 24;  in __subdev_8255_init()
166 	s->range_table	= &range_digital;  in __subdev_8255_init()
167 	s->maxdata	= 1;  in __subdev_8255_init()
168 	s->insn_bits	= subdev_8255_insn;  in __subdev_8255_init()
169 	s->insn_config	= subdev_8255_insn_config;  in __subdev_8255_init()
177  * subdev_8255_init - initialize DIO subdevice for driving I/O mapped 8255
180  * @io: (optional) register I/O call-back function
181  * @regbase: offset of 8255 registers from dev->iobase, or call-back context
185  * If the optional I/O call-back function is provided, its prototype is of
191  * where 'dev', and 'regbase' match the values passed to this function,
196  * If the optional I/O call-back function is not provided, an internal
197  * call-back function is used which uses consecutive I/O port addresses
198  * starting at dev->iobase + regbase.
200  * Return: -ENOMEM if failed to allocate memory, zero on success.
212  * subdev_8255_mm_init - initialize DIO subdevice for driving mmio-mapped 8255
215  * @io: (optional) register I/O call-back function
216  * @regbase: offset of 8255 registers from dev->mmio, or call-back context
220  * If the optional I/O call-back function is provided, its prototype is of
226  * where 'dev', and 'regbase' match the values passed to this function,
231  * If the optional I/O call-back function is not provided, an internal
232  * call-back function is used which uses consecutive MMIO virtual addresses
233  * starting at dev->mmio + regbase.
235  * Return: -ENOMEM if failed to allocate memory, zero on success.
247  * subdev_8255_regbase - get offset of 8255 registers or call-back context
256 	struct subdev_8255_private *spriv = s->private;  in subdev_8255_regbase()
258 	return spriv->regbase;  in subdev_8255_regbase()