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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [drivers/] [i2c/] [i2c-philips-par.c] - Blame information for rev 1774

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1 1275 phoenix 
/* ------------------------------------------------------------------------- */
2 
/* i2c-philips-par.c i2c-hw access for philips style parallel port adapters  */
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/* ------------------------------------------------------------------------- */
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/*   Copyright (C) 1995-2000 Simon G. Vogl
5 
 
6 
    This program is free software; you can redistribute it and/or modify
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    it under the terms of the GNU General Public License as published by
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    the Free Software Foundation; either version 2 of the License, or
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    (at your option) any later version.
10 
 
11 
    This program is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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    GNU General Public License for more details.
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16 
    You should have received a copy of the GNU General Public License
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    along with this program; if not, write to the Free Software
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    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.                */
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/* ------------------------------------------------------------------------- */
20 
 
21 
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
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   Frodo Looijaard <frodol@dds.nl> */
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24 
/* $Id: i2c-philips-par.c,v 1.1.1.1 2004-04-15 01:38:29 phoenix Exp $ */
25 
 
26 
#include <linux/kernel.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/stddef.h>
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#include <linux/parport.h>
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#include <linux/i2c.h>
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#include <linux/i2c-algo-bit.h>
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#ifndef __exit
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#define __exit __init
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#endif
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40 
static int type;
41 
 
42 
struct i2c_par
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{
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        struct pardevice *pdev;
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        struct i2c_adapter adapter;
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        struct i2c_algo_bit_data bit_lp_data;
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        struct i2c_par *next;
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};
49 
 
50 
static struct i2c_par *adapter_list;
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52 
 
53 
/* ----- global defines ----------------------------------------------- */
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#define DEB(x)          /* should be reasonable open, close &c.         */
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#define DEB2(x)         /* low level debugging - very slow              */
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#define DEBE(x) x       /* error messages                               */
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58 
/* ----- printer port defines ------------------------------------------*/
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                                        /* Pin Port  Inverted   name    */
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#define I2C_ON          0x20            /* 12 status N  paper           */
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                                        /* ... only for phil. not used  */
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#define I2C_SDA         0x80            /*  9 data   N  data7           */
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#define I2C_SCL         0x08            /* 17 ctrl   N  dsel            */
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#define I2C_SDAIN       0x80            /* 11 stat   Y  busy            */
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#define I2C_SCLIN       0x08            /* 15 stat   Y  enable          */
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#define I2C_DMASK       0x7f
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#define I2C_CMASK       0xf7
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71 
/* ----- local functions ---------------------------------------------- */
72 
 
73 
static void bit_lp_setscl(void *data, int state)
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{
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        /*be cautious about state of the control register -
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                touch only the one bit needed*/
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        if (state) {
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                parport_write_control((struct parport *) data,
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                      parport_read_control((struct parport *) data)|I2C_SCL);
80 
        } else {
81 
                parport_write_control((struct parport *) data,
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                      parport_read_control((struct parport *) data)&I2C_CMASK);
83 
        }
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}
85 
 
86 
static void bit_lp_setsda(void *data, int state)
87 
{
88 
        if (state) {
89 
                parport_write_data((struct parport *) data, I2C_DMASK);
90 
        } else {
91 
                parport_write_data((struct parport *) data, I2C_SDA);
92 
        }
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}
94 
 
95 
static int bit_lp_getscl(void *data)
96 
{
97 
        return parport_read_status((struct parport *) data) & I2C_SCLIN;
98 
}
99 
 
100 
static int bit_lp_getsda(void *data)
101 
{
102 
        return parport_read_status((struct parport *) data) & I2C_SDAIN;
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}
104 
 
105 
static void bit_lp_setscl2(void *data, int state)
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{
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        if (state) {
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                parport_write_data((struct parport *) data,
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                      parport_read_data((struct parport *) data)|0x1);
110 
        } else {
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                parport_write_data((struct parport *) data,
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                      parport_read_data((struct parport *) data)&0xfe);
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        }
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}
115 
 
116 
static void bit_lp_setsda2(void *data, int state)
117 
{
118 
        if (state) {
119 
                parport_write_data((struct parport *) data,
120 
                      parport_read_data((struct parport *) data)|0x2);
121 
        } else {
122 
                parport_write_data((struct parport *) data,
123 
                      parport_read_data((struct parport *) data)&0xfd);
124 
        }
125 
}
126 
 
127 
static int bit_lp_getsda2(void *data)
128 
{
129 
        return (parport_read_status((struct parport *) data) &
130 
                                     PARPORT_STATUS_BUSY) ? 0 : 1;
131 
}
132 
 
133 
static int bit_lp_reg(struct i2c_client *client)
134 
{
135 
        return 0;
136 
}
137 
 
138 
static int bit_lp_unreg(struct i2c_client *client)
139 
{
140 
        return 0;
141 
}
142 
 
143 
static void bit_lp_inc_use(struct i2c_adapter *adap)
144 
{
145 
        MOD_INC_USE_COUNT;
146 
}
147 
 
148 
static void bit_lp_dec_use(struct i2c_adapter *adap)
149 
{
150 
        MOD_DEC_USE_COUNT;
151 
}
152 
 
153 
/* ------------------------------------------------------------------------
154 
 * Encapsulate the above functions in the correct operations structure.
155 
 * This is only done when more than one hardware adapter is supported.
156 
 */
157 
 
158 
static struct i2c_algo_bit_data bit_lp_data = {
159 
        NULL,
160 
        bit_lp_setsda,
161 
        bit_lp_setscl,
162 
        bit_lp_getsda,
163 
        bit_lp_getscl,
164 
        80, 80, 100,            /*      waits, timeout */
165 
};
166 
 
167 
static struct i2c_algo_bit_data bit_lp_data2 = {
168 
        NULL,
169 
        bit_lp_setsda2,
170 
        bit_lp_setscl2,
171 
        bit_lp_getsda2,
172 
        NULL,
173 
        80, 80, 100,            /*      waits, timeout */
174 
};
175 
 
176 
static struct i2c_adapter bit_lp_ops = {
177 
        "Philips Parallel port adapter",
178 
        I2C_HW_B_LP,
179 
        NULL,
180 
        NULL,
181 
        bit_lp_inc_use,
182 
        bit_lp_dec_use,
183 
        bit_lp_reg,
184 
 
185 
        bit_lp_unreg,
186 
};
187 
 
188 
static void i2c_parport_attach (struct parport *port)
189 
{
190 
        struct i2c_par *adapter = kmalloc(sizeof(struct i2c_par),
191 
                                          GFP_KERNEL);
192 
        if (!adapter) {
193 
                printk(KERN_ERR "i2c-philips-par: Unable to malloc.\n");
194 
                return;
195 
        }
196 
 
197 
        printk(KERN_DEBUG "i2c-philips-par.o: attaching to %s\n", port->name);
198 
 
199 
        adapter->pdev = parport_register_device(port, "i2c-philips-par",
200 
                                                NULL, NULL, NULL,
201 
                                                PARPORT_FLAG_EXCL,
202 
                                                NULL);
203 
        if (!adapter->pdev) {
204 
                printk(KERN_ERR "i2c-philips-par: Unable to register with parport.\n");
205 
                return;
206 
        }
207 
 
208 
        adapter->adapter = bit_lp_ops;
209 
        adapter->adapter.algo_data = &adapter->bit_lp_data;
210 
        adapter->bit_lp_data = type ? bit_lp_data2 : bit_lp_data;
211 
        adapter->bit_lp_data.data = port;
212 
 
213 
        /* reset hardware to sane state */
214 
        parport_claim_or_block(adapter->pdev);
215 
        adapter->bit_lp_data.setsda(port, 1);
216 
        adapter->bit_lp_data.setscl(port, 1);
217 
        parport_release(adapter->pdev);
218 
 
219 
        if (i2c_bit_add_bus(&adapter->adapter) < 0)
220 
        {
221 
                printk(KERN_ERR "i2c-philips-par: Unable to register with I2C.\n");
222 
                parport_unregister_device(adapter->pdev);
223 
                kfree(adapter);
224 
                return;         /* No good */
225 
        }
226 
 
227 
        adapter->next = adapter_list;
228 
        adapter_list = adapter;
229 
}
230 
 
231 
static void i2c_parport_detach (struct parport *port)
232 
{
233 
        struct i2c_par *adapter, *prev = NULL;
234 
 
235 
        for (adapter = adapter_list; adapter; adapter = adapter->next)
236 
        {
237 
                if (adapter->pdev->port == port)
238 
                {
239 
                        parport_unregister_device(adapter->pdev);
240 
                        i2c_bit_del_bus(&adapter->adapter);
241 
                        if (prev)
242 
                                prev->next = adapter->next;
243 
                        else
244 
                                adapter_list = adapter->next;
245 
                        kfree(adapter);
246 
                        return;
247 
                }
248 
                prev = adapter;
249 
        }
250 
}
251 
 
252 
 
253 
static struct parport_driver i2c_driver = {
254 
        "i2c-philips-par",
255 
        i2c_parport_attach,
256 
        i2c_parport_detach,
257 
        NULL
258 
};
259 
 
260 
int __init i2c_bitlp_init(void)
261 
{
262 
        printk(KERN_INFO "i2c-philips-par.o: i2c Philips parallel port adapter module version %s (%s)\n", I2C_VERSION, I2C_DATE);
263 
 
264 
        parport_register_driver(&i2c_driver);
265 
 
266 
        return 0;
267 
}
268 
 
269 
void __exit i2c_bitlp_exit(void)
270 
{
271 
        parport_unregister_driver(&i2c_driver);
272 
}
273 
 
274 
EXPORT_NO_SYMBOLS;
275 
 
276 
MODULE_AUTHOR("Simon G. Vogl <simon@tk.uni-linz.ac.at>");
277 
MODULE_DESCRIPTION("I2C-Bus adapter routines for Philips parallel port adapter");
278 
MODULE_LICENSE("GPL");
279 
 
280 
MODULE_PARM(type, "i");
281 
 
282 
#ifdef MODULE
283 
int init_module(void)
284 
{
285 
        return i2c_bitlp_init();
286 
}
287 
 
288 
void cleanup_module(void)
289 
{
290 
        i2c_bitlp_exit();
291 
}
292 
#endif

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