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path: root/drivers/i2c/chips/rtc8564.c
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Diffstat (limited to 'drivers/i2c/chips/rtc8564.c')
-rw-r--r--drivers/i2c/chips/rtc8564.c385
1 files changed, 0 insertions, 385 deletions
diff --git a/drivers/i2c/chips/rtc8564.c b/drivers/i2c/chips/rtc8564.c
deleted file mode 100644
index 0d8699b3f488..000000000000
--- a/drivers/i2c/chips/rtc8564.c
+++ /dev/null
@@ -1,385 +0,0 @@
1/*
2 * linux/drivers/i2c/chips/rtc8564.c
3 *
4 * Copyright (C) 2002-2004 Stefan Eletzhofer
5 *
6 * based on linux/drivers/acron/char/pcf8583.c
7 * Copyright (C) 2000 Russell King
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 *
13 * Driver for system3's EPSON RTC 8564 chip
14 */
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/bcd.h>
18#include <linux/i2c.h>
19#include <linux/slab.h>
20#include <linux/string.h>
21#include <linux/rtc.h> /* get the user-level API */
22#include <linux/init.h>
23
24#include "rtc8564.h"
25
26#ifdef DEBUG
27# define _DBG(x, fmt, args...) do{ if (debug>=x) printk(KERN_DEBUG"%s: " fmt "\n", __FUNCTION__, ##args); } while(0);
28#else
29# define _DBG(x, fmt, args...) do { } while(0);
30#endif
31
32#define _DBGRTCTM(x, rtctm) if (debug>=x) printk("%s: secs=%d, mins=%d, hours=%d, mday=%d, " \
33 "mon=%d, year=%d, wday=%d VL=%d\n", __FUNCTION__, \
34 (rtctm).secs, (rtctm).mins, (rtctm).hours, (rtctm).mday, \
35 (rtctm).mon, (rtctm).year, (rtctm).wday, (rtctm).vl);
36
37struct rtc8564_data {
38 struct i2c_client client;
39 u16 ctrl;
40};
41
42static inline u8 _rtc8564_ctrl1(struct i2c_client *client)
43{
44 struct rtc8564_data *data = i2c_get_clientdata(client);
45 return data->ctrl & 0xff;
46}
47static inline u8 _rtc8564_ctrl2(struct i2c_client *client)
48{
49 struct rtc8564_data *data = i2c_get_clientdata(client);
50 return (data->ctrl & 0xff00) >> 8;
51}
52
53#define CTRL1(c) _rtc8564_ctrl1(c)
54#define CTRL2(c) _rtc8564_ctrl2(c)
55
56static int debug;
57module_param(debug, int, S_IRUGO | S_IWUSR);
58
59static struct i2c_driver rtc8564_driver;
60
61static unsigned short ignore[] = { I2C_CLIENT_END };
62static unsigned short normal_addr[] = { 0x51, I2C_CLIENT_END };
63
64static struct i2c_client_address_data addr_data = {
65 .normal_i2c = normal_addr,
66 .probe = ignore,
67 .ignore = ignore,
68};
69
70static int rtc8564_read_mem(struct i2c_client *client, struct mem *mem);
71static int rtc8564_write_mem(struct i2c_client *client, struct mem *mem);
72
73static int rtc8564_read(struct i2c_client *client, unsigned char adr,
74 unsigned char *buf, unsigned char len)
75{
76 int ret = -EIO;
77 unsigned char addr[1] = { adr };
78 struct i2c_msg msgs[2] = {
79 {client->addr, 0, 1, addr},
80 {client->addr, I2C_M_RD, len, buf}
81 };
82
83 _DBG(1, "client=%p, adr=%d, buf=%p, len=%d", client, adr, buf, len);
84
85 if (!buf) {
86 ret = -EINVAL;
87 goto done;
88 }
89
90 ret = i2c_transfer(client->adapter, msgs, 2);
91 if (ret == 2) {
92 ret = 0;
93 }
94
95done:
96 return ret;
97}
98
99static int rtc8564_write(struct i2c_client *client, unsigned char adr,
100 unsigned char *data, unsigned char len)
101{
102 int ret = 0;
103 unsigned char _data[16];
104 struct i2c_msg wr;
105 int i;
106
107 if (!data || len > 15) {
108 ret = -EINVAL;
109 goto done;
110 }
111
112 _DBG(1, "client=%p, adr=%d, buf=%p, len=%d", client, adr, data, len);
113
114 _data[0] = adr;
115 for (i = 0; i < len; i++) {
116 _data[i + 1] = data[i];
117 _DBG(5, "data[%d] = 0x%02x (%d)", i, data[i], data[i]);
118 }
119
120 wr.addr = client->addr;
121 wr.flags = 0;
122 wr.len = len + 1;
123 wr.buf = _data;
124
125 ret = i2c_transfer(client->adapter, &wr, 1);
126 if (ret == 1) {
127 ret = 0;
128 }
129
130done:
131 return ret;
132}
133
134static int rtc8564_attach(struct i2c_adapter *adap, int addr, int kind)
135{
136 int ret;
137 struct i2c_client *new_client;
138 struct rtc8564_data *d;
139 unsigned char data[10];
140 unsigned char ad[1] = { 0 };
141 struct i2c_msg ctrl_wr[1] = {
142 {addr, 0, 2, data}
143 };
144 struct i2c_msg ctrl_rd[2] = {
145 {addr, 0, 1, ad},
146 {addr, I2C_M_RD, 2, data}
147 };
148
149 d = kzalloc(sizeof(struct rtc8564_data), GFP_KERNEL);
150 if (!d) {
151 ret = -ENOMEM;
152 goto done;
153 }
154 new_client = &d->client;
155
156 strlcpy(new_client->name, "RTC8564", I2C_NAME_SIZE);
157 i2c_set_clientdata(new_client, d);
158 new_client->addr = addr;
159 new_client->adapter = adap;
160 new_client->driver = &rtc8564_driver;
161
162 _DBG(1, "client=%p", new_client);
163
164 /* init ctrl1 reg */
165 data[0] = 0;
166 data[1] = 0;
167 ret = i2c_transfer(new_client->adapter, ctrl_wr, 1);
168 if (ret != 1) {
169 printk(KERN_INFO "rtc8564: cant init ctrl1\n");
170 ret = -ENODEV;
171 goto done;
172 }
173
174 /* read back ctrl1 and ctrl2 */
175 ret = i2c_transfer(new_client->adapter, ctrl_rd, 2);
176 if (ret != 2) {
177 printk(KERN_INFO "rtc8564: cant read ctrl\n");
178 ret = -ENODEV;
179 goto done;
180 }
181
182 d->ctrl = data[0] | (data[1] << 8);
183
184 _DBG(1, "RTC8564_REG_CTRL1=%02x, RTC8564_REG_CTRL2=%02x",
185 data[0], data[1]);
186
187 ret = i2c_attach_client(new_client);
188done:
189 if (ret) {
190 kfree(d);
191 }
192 return ret;
193}
194
195static int rtc8564_probe(struct i2c_adapter *adap)
196{
197 return i2c_probe(adap, &addr_data, rtc8564_attach);
198}
199
200static int rtc8564_detach(struct i2c_client *client)
201{
202 i2c_detach_client(client);
203 kfree(i2c_get_clientdata(client));
204 return 0;
205}
206
207static int rtc8564_get_datetime(struct i2c_client *client, struct rtc_tm *dt)
208{
209 int ret = -EIO;
210 unsigned char buf[15];
211
212 _DBG(1, "client=%p, dt=%p", client, dt);
213
214 if (!dt)
215 return -EINVAL;
216
217 memset(buf, 0, sizeof(buf));
218
219 ret = rtc8564_read(client, 0, buf, 15);
220 if (ret)
221 return ret;
222
223 /* century stored in minute alarm reg */
224 dt->year = BCD2BIN(buf[RTC8564_REG_YEAR]);
225 dt->year += 100 * BCD2BIN(buf[RTC8564_REG_AL_MIN] & 0x3f);
226 dt->mday = BCD2BIN(buf[RTC8564_REG_DAY] & 0x3f);
227 dt->wday = BCD2BIN(buf[RTC8564_REG_WDAY] & 7);
228 dt->mon = BCD2BIN(buf[RTC8564_REG_MON_CENT] & 0x1f);
229
230 dt->secs = BCD2BIN(buf[RTC8564_REG_SEC] & 0x7f);
231 dt->vl = (buf[RTC8564_REG_SEC] & 0x80) == 0x80;
232 dt->mins = BCD2BIN(buf[RTC8564_REG_MIN] & 0x7f);
233 dt->hours = BCD2BIN(buf[RTC8564_REG_HR] & 0x3f);
234
235 _DBGRTCTM(2, *dt);
236
237 return 0;
238}
239
240static int
241rtc8564_set_datetime(struct i2c_client *client, struct rtc_tm *dt, int datetoo)
242{
243 int ret, len = 5;
244 unsigned char buf[15];
245
246 _DBG(1, "client=%p, dt=%p", client, dt);
247
248 if (!dt)
249 return -EINVAL;
250
251 _DBGRTCTM(2, *dt);
252
253 buf[RTC8564_REG_CTRL1] = CTRL1(client) | RTC8564_CTRL1_STOP;
254 buf[RTC8564_REG_CTRL2] = CTRL2(client);
255 buf[RTC8564_REG_SEC] = BIN2BCD(dt->secs);
256 buf[RTC8564_REG_MIN] = BIN2BCD(dt->mins);
257 buf[RTC8564_REG_HR] = BIN2BCD(dt->hours);
258
259 if (datetoo) {
260 len += 5;
261 buf[RTC8564_REG_DAY] = BIN2BCD(dt->mday);
262 buf[RTC8564_REG_WDAY] = BIN2BCD(dt->wday);
263 buf[RTC8564_REG_MON_CENT] = BIN2BCD(dt->mon) & 0x1f;
264 /* century stored in minute alarm reg */
265 buf[RTC8564_REG_YEAR] = BIN2BCD(dt->year % 100);
266 buf[RTC8564_REG_AL_MIN] = BIN2BCD(dt->year / 100);
267 }
268
269 ret = rtc8564_write(client, 0, buf, len);
270 if (ret) {
271 _DBG(1, "error writing data! %d", ret);
272 }
273
274 buf[RTC8564_REG_CTRL1] = CTRL1(client);
275 ret = rtc8564_write(client, 0, buf, 1);
276 if (ret) {
277 _DBG(1, "error writing data! %d", ret);
278 }
279
280 return ret;
281}
282
283static int rtc8564_get_ctrl(struct i2c_client *client, unsigned int *ctrl)
284{
285 struct rtc8564_data *data = i2c_get_clientdata(client);
286
287 if (!ctrl)
288 return -1;
289
290 *ctrl = data->ctrl;
291 return 0;
292}
293
294static int rtc8564_set_ctrl(struct i2c_client *client, unsigned int *ctrl)
295{
296 struct rtc8564_data *data = i2c_get_clientdata(client);
297 unsigned char buf[2];
298
299 if (!ctrl)
300 return -1;
301
302 buf[0] = *ctrl & 0xff;
303 buf[1] = (*ctrl & 0xff00) >> 8;
304 data->ctrl = *ctrl;
305
306 return rtc8564_write(client, 0, buf, 2);
307}
308
309static int rtc8564_read_mem(struct i2c_client *client, struct mem *mem)
310{
311
312 if (!mem)
313 return -EINVAL;
314
315 return rtc8564_read(client, mem->loc, mem->data, mem->nr);
316}
317
318static int rtc8564_write_mem(struct i2c_client *client, struct mem *mem)
319{
320
321 if (!mem)
322 return -EINVAL;
323
324 return rtc8564_write(client, mem->loc, mem->data, mem->nr);
325}
326
327static int
328rtc8564_command(struct i2c_client *client, unsigned int cmd, void *arg)
329{
330
331 _DBG(1, "cmd=%d", cmd);
332
333 switch (cmd) {
334 case RTC_GETDATETIME:
335 return rtc8564_get_datetime(client, arg);
336
337 case RTC_SETTIME:
338 return rtc8564_set_datetime(client, arg, 0);
339
340 case RTC_SETDATETIME:
341 return rtc8564_set_datetime(client, arg, 1);
342
343 case RTC_GETCTRL:
344 return rtc8564_get_ctrl(client, arg);
345
346 case RTC_SETCTRL:
347 return rtc8564_set_ctrl(client, arg);
348
349 case MEM_READ:
350 return rtc8564_read_mem(client, arg);
351
352 case MEM_WRITE:
353 return rtc8564_write_mem(client, arg);
354
355 default:
356 return -EINVAL;
357 }
358}
359
360static struct i2c_driver rtc8564_driver = {
361 .driver = {
362 .name = "RTC8564",
363 },
364 .id = I2C_DRIVERID_RTC8564,
365 .attach_adapter = rtc8564_probe,
366 .detach_client = rtc8564_detach,
367 .command = rtc8564_command
368};
369
370static __init int rtc8564_init(void)
371{
372 return i2c_add_driver(&rtc8564_driver);
373}
374
375static __exit void rtc8564_exit(void)
376{
377 i2c_del_driver(&rtc8564_driver);
378}
379
380MODULE_AUTHOR("Stefan Eletzhofer <Stefan.Eletzhofer@eletztrick.de>");
381MODULE_DESCRIPTION("EPSON RTC8564 Driver");
382MODULE_LICENSE("GPL");
383
384module_init(rtc8564_init);
385module_exit(rtc8564_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 17:32:10 -0500