Deleted Added
sdiff udiff text old ( 185003 ) new ( 187576 )
full compact
lpbb.c (185003) lpbb.c (187576)
1/*-
2 * Copyright (c) 1998, 2001 Nicolas Souchu, Marc Bouget
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 13 unchanged lines hidden (view full) ---

22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *
27 */
28
29#include <sys/cdefs.h>
1/*-
2 * Copyright (c) 1998, 2001 Nicolas Souchu, Marc Bouget
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 13 unchanged lines hidden (view full) ---

22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/sys/dev/ppbus/lpbb.c 185003 2008-11-16 17:42:02Z jhb $");
30__FBSDID("$FreeBSD: head/sys/dev/ppbus/lpbb.c 187576 2009-01-21 23:10:06Z jhb $");
31
32/*
33 * I2C Bit-Banging over parallel port
34 *
35 * See the Official Philips interface description in lpbb(4)
36 */
37
38#include <sys/param.h>

--- 59 unchanged lines hidden (view full) ---

98 device_t ppbus = device_get_parent(dev);
99 int error = 0;
100 int how;
101
102 switch (index) {
103 case IIC_REQUEST_BUS:
104 /* request the ppbus */
105 how = *(int *)data;
31
32/*
33 * I2C Bit-Banging over parallel port
34 *
35 * See the Official Philips interface description in lpbb(4)
36 */
37
38#include <sys/param.h>

--- 59 unchanged lines hidden (view full) ---

98 device_t ppbus = device_get_parent(dev);
99 int error = 0;
100 int how;
101
102 switch (index) {
103 case IIC_REQUEST_BUS:
104 /* request the ppbus */
105 how = *(int *)data;
106 mtx_lock(&Giant);
106 ppb_lock(ppbus);
107 error = ppb_request_bus(ppbus, dev, how);
107 error = ppb_request_bus(ppbus, dev, how);
108 mtx_unlock(&Giant);
108 ppb_unlock(ppbus);
109 break;
110
111 case IIC_RELEASE_BUS:
112 /* release the ppbus */
109 break;
110
111 case IIC_RELEASE_BUS:
112 /* release the ppbus */
113 mtx_lock(&Giant);
113 ppb_lock(ppbus);
114 error = ppb_release_bus(ppbus, dev);
114 error = ppb_release_bus(ppbus, dev);
115 mtx_unlock(&Giant);
115 ppb_unlock(ppbus);
116 break;
117
118 default:
119 error = EINVAL;
120 }
121
122 return (error);
123}
124
125#define SDA_out 0x80
126#define SCL_out 0x08
127#define SDA_in 0x80
128#define SCL_in 0x08
129#define ALIM 0x20
130#define I2CKEY 0x50
131
116 break;
117
118 default:
119 error = EINVAL;
120 }
121
122 return (error);
123}
124
125#define SDA_out 0x80
126#define SCL_out 0x08
127#define SDA_in 0x80
128#define SCL_in 0x08
129#define ALIM 0x20
130#define I2CKEY 0x50
131
132/* Reset bus by setting SDA first and then SCL. */
133static void
134lpbb_reset_bus(device_t dev)
135{
136 device_t ppbus = device_get_parent(dev);
137
138 ppb_assert_locked(ppbus);
139 ppb_wdtr(ppbus, (u_char)~SDA_out);
140 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) | SCL_out));
141}
142
132static int
133lpbb_getscl(device_t dev)
134{
143static int
144lpbb_getscl(device_t dev)
145{
146 device_t ppbus = device_get_parent(dev);
135 int rval;
136
147 int rval;
148
137 mtx_lock(&Giant);
138 rval = ((ppb_rstr(device_get_parent(dev)) & SCL_in) == SCL_in);
139 mtx_unlock(&Giant);
149 ppb_lock(ppbus);
150 rval = ((ppb_rstr(ppbus) & SCL_in) == SCL_in);
151 ppb_unlock(ppbus);
140 return (rval);
141}
142
143static int
144lpbb_getsda(device_t dev)
145{
152 return (rval);
153}
154
155static int
156lpbb_getsda(device_t dev)
157{
158 device_t ppbus = device_get_parent(dev);
146 int rval;
147
159 int rval;
160
148 mtx_lock(&Giant);
149 rval = ((ppb_rstr(device_get_parent(dev)) & SDA_in) == SDA_in);
150 mtx_unlock(&Giant);
161 ppb_lock(ppbus);
162 rval = ((ppb_rstr(ppbus) & SDA_in) == SDA_in);
163 ppb_unlock(ppbus);
151 return (rval);
152}
153
154static void
155lpbb_setsda(device_t dev, char val)
156{
157 device_t ppbus = device_get_parent(dev);
158
164 return (rval);
165}
166
167static void
168lpbb_setsda(device_t dev, char val)
169{
170 device_t ppbus = device_get_parent(dev);
171
159 mtx_lock(&Giant);
172 ppb_lock(ppbus);
160 if (val == 0)
161 ppb_wdtr(ppbus, (u_char)SDA_out);
162 else
163 ppb_wdtr(ppbus, (u_char)~SDA_out);
173 if (val == 0)
174 ppb_wdtr(ppbus, (u_char)SDA_out);
175 else
176 ppb_wdtr(ppbus, (u_char)~SDA_out);
164 mtx_unlock(&Giant);
177 ppb_unlock(ppbus);
165}
166
167static void
168lpbb_setscl(device_t dev, unsigned char val)
169{
170 device_t ppbus = device_get_parent(dev);
171
178}
179
180static void
181lpbb_setscl(device_t dev, unsigned char val)
182{
183 device_t ppbus = device_get_parent(dev);
184
172 mtx_lock(&Giant);
185 ppb_lock(ppbus);
173 if (val == 0)
174 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) & ~SCL_out));
175 else
176 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) | SCL_out));
186 if (val == 0)
187 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) & ~SCL_out));
188 else
189 ppb_wctr(ppbus, (u_char)(ppb_rctr(ppbus) | SCL_out));
177 mtx_unlock(&Giant);
190 ppb_unlock(ppbus);
178}
179
180static int
181lpbb_detect(device_t dev)
182{
183 device_t ppbus = device_get_parent(dev);
184
191}
192
193static int
194lpbb_detect(device_t dev)
195{
196 device_t ppbus = device_get_parent(dev);
197
198 ppb_lock(ppbus);
185 if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
199 if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
200 ppb_unlock(ppbus);
186 device_printf(dev, "can't allocate ppbus\n");
187 return (0);
188 }
189
201 device_printf(dev, "can't allocate ppbus\n");
202 return (0);
203 }
204
190 /* reset bus */
191 lpbb_setsda(dev, 1);
192 lpbb_setscl(dev, 1);
205 lpbb_reset_bus(dev);
193
194 if ((ppb_rstr(ppbus) & I2CKEY) ||
195 ((ppb_rstr(ppbus) & ALIM) != ALIM)) {
206
207 if ((ppb_rstr(ppbus) & I2CKEY) ||
208 ((ppb_rstr(ppbus) & ALIM) != ALIM)) {
196
197 ppb_release_bus(ppbus, dev);
209 ppb_release_bus(ppbus, dev);
210 ppb_unlock(ppbus);
198 return (0);
199 }
200
201 ppb_release_bus(ppbus, dev);
211 return (0);
212 }
213
214 ppb_release_bus(ppbus, dev);
215 ppb_unlock(ppbus);
202
203 return (1);
204}
205
206static int
207lpbb_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
208{
209 device_t ppbus = device_get_parent(dev);
210
216
217 return (1);
218}
219
220static int
221lpbb_reset(device_t dev, u_char speed, u_char addr, u_char * oldaddr)
222{
223 device_t ppbus = device_get_parent(dev);
224
211 mtx_lock(&Giant);
225 ppb_lock(ppbus);
212 if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
226 if (ppb_request_bus(ppbus, dev, PPB_DONTWAIT)) {
227 ppb_unlock(ppbus);
213 device_printf(dev, "can't allocate ppbus\n");
214 return (0);
215 }
216
228 device_printf(dev, "can't allocate ppbus\n");
229 return (0);
230 }
231
217 /* reset bus */
218 lpbb_setsda(dev, 1);
219 lpbb_setscl(dev, 1);
232 lpbb_reset_bus(dev);
220
221 ppb_release_bus(ppbus, dev);
233
234 ppb_release_bus(ppbus, dev);
222 mtx_unlock(&Giant);
235 ppb_unlock(ppbus);
223
224 return (IIC_ENOADDR);
225}
226
227static devclass_t lpbb_devclass;
228
229static device_method_t lpbb_methods[] = {
230 /* device interface */

--- 29 unchanged lines hidden --- 		236
237 return (IIC_ENOADDR);
238}
239
240static devclass_t lpbb_devclass;
241
242static device_method_t lpbb_methods[] = {
243 /* device interface */

--- 29 unchanged lines hidden ---