rtc-x1205.c (4edac2b442d6176afb0ae431123993dc00882987) rtc-x1205.c (2a4e2b8780c6df42b19c053243dada7fa4d311ee)
1/*
2 * An i2c driver for the Xicor/Intersil X1205 RTC
3 * Copyright 2004 Karen Spearel
4 * Copyright 2005 Alessandro Zummo
5 *
6 * please send all reports to:
7 * Karen Spearel <kas111 at gmail dot com>
8 * Alessandro Zummo <a.zummo@towertech.it>

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94
95 struct i2c_msg msgs[] = {
96 { client->addr, 0, 2, dt_addr }, /* setup read ptr */
97 { client->addr, I2C_M_RD, 8, buf }, /* read date */
98 };
99
100 /* read date registers */
101 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
1/*
2 * An i2c driver for the Xicor/Intersil X1205 RTC
3 * Copyright 2004 Karen Spearel
4 * Copyright 2005 Alessandro Zummo
5 *
6 * please send all reports to:
7 * Karen Spearel <kas111 at gmail dot com>
8 * Alessandro Zummo <a.zummo@towertech.it>

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94
95 struct i2c_msg msgs[] = {
96 { client->addr, 0, 2, dt_addr }, /* setup read ptr */
97 { client->addr, I2C_M_RD, 8, buf }, /* read date */
98 };
99
100 /* read date registers */
101 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
102 dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
102 dev_err(&client->dev, "%s: read error\n", __func__);
103 return -EIO;
104 }
105
106 dev_dbg(&client->dev,
107 "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
108 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
103 return -EIO;
104 }
105
106 dev_dbg(&client->dev,
107 "%s: raw read data - sec=%02x, min=%02x, hr=%02x, "
108 "mday=%02x, mon=%02x, year=%02x, wday=%02x, y2k=%02x\n",
109 __FUNCTION__,
109 __func__,
110 buf[0], buf[1], buf[2], buf[3],
111 buf[4], buf[5], buf[6], buf[7]);
112
113 tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
114 tm->tm_min = BCD2BIN(buf[CCR_MIN]);
115 tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
116 tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
117 tm->tm_mon = BCD2BIN(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
118 tm->tm_year = BCD2BIN(buf[CCR_YEAR])
119 + (BCD2BIN(buf[CCR_Y2K]) * 100) - 1900;
120 tm->tm_wday = buf[CCR_WDAY];
121
122 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
123 "mday=%d, mon=%d, year=%d, wday=%d\n",
110 buf[0], buf[1], buf[2], buf[3],
111 buf[4], buf[5], buf[6], buf[7]);
112
113 tm->tm_sec = BCD2BIN(buf[CCR_SEC]);
114 tm->tm_min = BCD2BIN(buf[CCR_MIN]);
115 tm->tm_hour = BCD2BIN(buf[CCR_HOUR] & 0x3F); /* hr is 0-23 */
116 tm->tm_mday = BCD2BIN(buf[CCR_MDAY]);
117 tm->tm_mon = BCD2BIN(buf[CCR_MONTH]) - 1; /* mon is 0-11 */
118 tm->tm_year = BCD2BIN(buf[CCR_YEAR])
119 + (BCD2BIN(buf[CCR_Y2K]) * 100) - 1900;
120 tm->tm_wday = buf[CCR_WDAY];
121
122 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
123 "mday=%d, mon=%d, year=%d, wday=%d\n",
124 __FUNCTION__,
124 __func__,
125 tm->tm_sec, tm->tm_min, tm->tm_hour,
126 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
127
128 return 0;
129}
130
131static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
132{
133 static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
134
135 struct i2c_msg msgs[] = {
136 { client->addr, 0, 2, sr_addr }, /* setup read ptr */
137 { client->addr, I2C_M_RD, 1, sr }, /* read status */
138 };
139
140 /* read status register */
141 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
125 tm->tm_sec, tm->tm_min, tm->tm_hour,
126 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
127
128 return 0;
129}
130
131static int x1205_get_status(struct i2c_client *client, unsigned char *sr)
132{
133 static unsigned char sr_addr[2] = { 0, X1205_REG_SR };
134
135 struct i2c_msg msgs[] = {
136 { client->addr, 0, 2, sr_addr }, /* setup read ptr */
137 { client->addr, I2C_M_RD, 1, sr }, /* read status */
138 };
139
140 /* read status register */
141 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
142 dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
142 dev_err(&client->dev, "%s: read error\n", __func__);
143 return -EIO;
144 }
145
146 return 0;
147}
148
149static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
150 int datetoo, u8 reg_base)

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157
158 static const unsigned char rwel[3] = { 0, X1205_REG_SR,
159 X1205_SR_WEL | X1205_SR_RWEL };
160
161 static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
162
163 dev_dbg(&client->dev,
164 "%s: secs=%d, mins=%d, hours=%d\n",
143 return -EIO;
144 }
145
146 return 0;
147}
148
149static int x1205_set_datetime(struct i2c_client *client, struct rtc_time *tm,
150 int datetoo, u8 reg_base)

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157
158 static const unsigned char rwel[3] = { 0, X1205_REG_SR,
159 X1205_SR_WEL | X1205_SR_RWEL };
160
161 static const unsigned char diswe[3] = { 0, X1205_REG_SR, 0 };
162
163 dev_dbg(&client->dev,
164 "%s: secs=%d, mins=%d, hours=%d\n",
165 __FUNCTION__,
165 __func__,
166 tm->tm_sec, tm->tm_min, tm->tm_hour);
167
168 buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
169 buf[CCR_MIN] = BIN2BCD(tm->tm_min);
170
171 /* set hour and 24hr bit */
172 buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL;
173
174 /* should we also set the date? */
175 if (datetoo) {
176 dev_dbg(&client->dev,
177 "%s: mday=%d, mon=%d, year=%d, wday=%d\n",
166 tm->tm_sec, tm->tm_min, tm->tm_hour);
167
168 buf[CCR_SEC] = BIN2BCD(tm->tm_sec);
169 buf[CCR_MIN] = BIN2BCD(tm->tm_min);
170
171 /* set hour and 24hr bit */
172 buf[CCR_HOUR] = BIN2BCD(tm->tm_hour) | X1205_HR_MIL;
173
174 /* should we also set the date? */
175 if (datetoo) {
176 dev_dbg(&client->dev,
177 "%s: mday=%d, mon=%d, year=%d, wday=%d\n",
178 __FUNCTION__,
178 __func__,
179 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
180
181 buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
182
183 /* month, 1 - 12 */
184 buf[CCR_MONTH] = BIN2BCD(tm->tm_mon + 1);
185
186 /* year, since the rtc epoch*/
187 buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100);
188 buf[CCR_WDAY] = tm->tm_wday & 0x07;
189 buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
190 }
191
192 /* this sequence is required to unlock the chip */
193 if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
179 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
180
181 buf[CCR_MDAY] = BIN2BCD(tm->tm_mday);
182
183 /* month, 1 - 12 */
184 buf[CCR_MONTH] = BIN2BCD(tm->tm_mon + 1);
185
186 /* year, since the rtc epoch*/
187 buf[CCR_YEAR] = BIN2BCD(tm->tm_year % 100);
188 buf[CCR_WDAY] = tm->tm_wday & 0x07;
189 buf[CCR_Y2K] = BIN2BCD(tm->tm_year / 100);
190 }
191
192 /* this sequence is required to unlock the chip */
193 if ((xfer = i2c_master_send(client, wel, 3)) != 3) {
194 dev_err(&client->dev, "%s: wel - %d\n", __FUNCTION__, xfer);
194 dev_err(&client->dev, "%s: wel - %d\n", __func__, xfer);
195 return -EIO;
196 }
197
198 if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
195 return -EIO;
196 }
197
198 if ((xfer = i2c_master_send(client, rwel, 3)) != 3) {
199 dev_err(&client->dev, "%s: rwel - %d\n", __FUNCTION__, xfer);
199 dev_err(&client->dev, "%s: rwel - %d\n", __func__, xfer);
200 return -EIO;
201 }
202
203 /* write register's data */
204 for (i = 0; i < (datetoo ? 8 : 3); i++) {
205 unsigned char rdata[3] = { 0, reg_base + i, buf[i] };
206
207 xfer = i2c_master_send(client, rdata, 3);
208 if (xfer != 3) {
209 dev_err(&client->dev,
210 "%s: xfer=%d addr=%02x, data=%02x\n",
200 return -EIO;
201 }
202
203 /* write register's data */
204 for (i = 0; i < (datetoo ? 8 : 3); i++) {
205 unsigned char rdata[3] = { 0, reg_base + i, buf[i] };
206
207 xfer = i2c_master_send(client, rdata, 3);
208 if (xfer != 3) {
209 dev_err(&client->dev,
210 "%s: xfer=%d addr=%02x, data=%02x\n",
211 __FUNCTION__,
211 __func__,
212 xfer, rdata[1], rdata[2]);
213 return -EIO;
214 }
215 };
216
217 /* disable further writes */
218 if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
212 xfer, rdata[1], rdata[2]);
213 return -EIO;
214 }
215 };
216
217 /* disable further writes */
218 if ((xfer = i2c_master_send(client, diswe, 3)) != 3) {
219 dev_err(&client->dev, "%s: diswe - %d\n", __FUNCTION__, xfer);
219 dev_err(&client->dev, "%s: diswe - %d\n", __func__, xfer);
220 return -EIO;
221 }
222
223 return 0;
224}
225
226static int x1205_fix_osc(struct i2c_client *client)
227{

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244
245 struct i2c_msg msgs[] = {
246 { client->addr, 0, 2, dtr_addr }, /* setup read ptr */
247 { client->addr, I2C_M_RD, 1, &dtr }, /* read dtr */
248 };
249
250 /* read dtr register */
251 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
220 return -EIO;
221 }
222
223 return 0;
224}
225
226static int x1205_fix_osc(struct i2c_client *client)
227{

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244
245 struct i2c_msg msgs[] = {
246 { client->addr, 0, 2, dtr_addr }, /* setup read ptr */
247 { client->addr, I2C_M_RD, 1, &dtr }, /* read dtr */
248 };
249
250 /* read dtr register */
251 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
252 dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
252 dev_err(&client->dev, "%s: read error\n", __func__);
253 return -EIO;
254 }
255
253 return -EIO;
254 }
255
256 dev_dbg(&client->dev, "%s: raw dtr=%x\n", __FUNCTION__, dtr);
256 dev_dbg(&client->dev, "%s: raw dtr=%x\n", __func__, dtr);
257
258 *trim = 0;
259
260 if (dtr & X1205_DTR_DTR0)
261 *trim += 20;
262
263 if (dtr & X1205_DTR_DTR1)
264 *trim += 10;

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276
277 struct i2c_msg msgs[] = {
278 { client->addr, 0, 2, atr_addr }, /* setup read ptr */
279 { client->addr, I2C_M_RD, 1, &atr }, /* read atr */
280 };
281
282 /* read atr register */
283 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
257
258 *trim = 0;
259
260 if (dtr & X1205_DTR_DTR0)
261 *trim += 20;
262
263 if (dtr & X1205_DTR_DTR1)
264 *trim += 10;

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276
277 struct i2c_msg msgs[] = {
278 { client->addr, 0, 2, atr_addr }, /* setup read ptr */
279 { client->addr, I2C_M_RD, 1, &atr }, /* read atr */
280 };
281
282 /* read atr register */
283 if ((i2c_transfer(client->adapter, &msgs[0], 2)) != 2) {
284 dev_err(&client->dev, "%s: read error\n", __FUNCTION__);
284 dev_err(&client->dev, "%s: read error\n", __func__);
285 return -EIO;
286 }
287
285 return -EIO;
286 }
287
288 dev_dbg(&client->dev, "%s: raw atr=%x\n", __FUNCTION__, atr);
288 dev_dbg(&client->dev, "%s: raw atr=%x\n", __func__, atr);
289
290 /* atr is a two's complement value on 6 bits,
291 * perform sign extension. The formula is
292 * Catr = (atr * 0.25pF) + 11.00pF.
293 */
294 if (atr & 0x20)
295 atr |= 0xC0;
296
289
290 /* atr is a two's complement value on 6 bits,
291 * perform sign extension. The formula is
292 * Catr = (atr * 0.25pF) + 11.00pF.
293 */
294 if (atr & 0x20)
295 atr |= 0xC0;
296
297 dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __FUNCTION__, atr, atr);
297 dev_dbg(&client->dev, "%s: raw atr=%x (%d)\n", __func__, atr, atr);
298
299 *trim = (atr * 250) + 11000;
300
298
299 *trim = (atr * 250) + 11000;
300
301 dev_dbg(&client->dev, "%s: real=%d\n", __FUNCTION__, *trim);
301 dev_dbg(&client->dev, "%s: real=%d\n", __func__, *trim);
302
303 return 0;
304}
305
306struct x1205_limit
307{
308 unsigned char reg, mask, min, max;
309};

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347 struct i2c_msg msgs[2] = {
348 { client->addr, 0, 2, addr },
349 { client->addr, I2C_M_RD, 1, &buf },
350 };
351
352 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
353 dev_err(&client->dev,
354 "%s: could not read register %x\n",
302
303 return 0;
304}
305
306struct x1205_limit
307{
308 unsigned char reg, mask, min, max;
309};

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

347 struct i2c_msg msgs[2] = {
348 { client->addr, 0, 2, addr },
349 { client->addr, I2C_M_RD, 1, &buf },
350 };
351
352 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
353 dev_err(&client->dev,
354 "%s: could not read register %x\n",
355 __FUNCTION__, probe_zero_pattern[i]);
355 __func__, probe_zero_pattern[i]);
356
357 return -EIO;
358 }
359
360 if ((buf & probe_zero_pattern[i+1]) != 0) {
361 dev_err(&client->dev,
362 "%s: register=%02x, zero pattern=%d, value=%x\n",
356
357 return -EIO;
358 }
359
360 if ((buf & probe_zero_pattern[i+1]) != 0) {
361 dev_err(&client->dev,
362 "%s: register=%02x, zero pattern=%d, value=%x\n",
363 __FUNCTION__, probe_zero_pattern[i], i, buf);
363 __func__, probe_zero_pattern[i], i, buf);
364
365 return -ENODEV;
366 }
367 }
368
369 /* check limits (only registers with bcd values) */
370 for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
371 unsigned char reg, value;
372
373 unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
374
375 struct i2c_msg msgs[2] = {
376 { client->addr, 0, 2, addr },
377 { client->addr, I2C_M_RD, 1, &reg },
378 };
379
380 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
381 dev_err(&client->dev,
382 "%s: could not read register %x\n",
364
365 return -ENODEV;
366 }
367 }
368
369 /* check limits (only registers with bcd values) */
370 for (i = 0; i < ARRAY_SIZE(probe_limits_pattern); i++) {
371 unsigned char reg, value;
372
373 unsigned char addr[2] = { 0, probe_limits_pattern[i].reg };
374
375 struct i2c_msg msgs[2] = {
376 { client->addr, 0, 2, addr },
377 { client->addr, I2C_M_RD, 1, &reg },
378 };
379
380 if ((xfer = i2c_transfer(client->adapter, msgs, 2)) != 2) {
381 dev_err(&client->dev,
382 "%s: could not read register %x\n",
383 __FUNCTION__, probe_limits_pattern[i].reg);
383 __func__, probe_limits_pattern[i].reg);
384
385 return -EIO;
386 }
387
388 value = BCD2BIN(reg & probe_limits_pattern[i].mask);
389
390 if (value > probe_limits_pattern[i].max ||
391 value < probe_limits_pattern[i].min) {
392 dev_dbg(&client->dev,
393 "%s: register=%x, lim pattern=%d, value=%d\n",
384
385 return -EIO;
386 }
387
388 value = BCD2BIN(reg & probe_limits_pattern[i].mask);
389
390 if (value > probe_limits_pattern[i].max ||
391 value < probe_limits_pattern[i].min) {
392 dev_dbg(&client->dev,
393 "%s: register=%x, lim pattern=%d, value=%d\n",
394 __FUNCTION__, probe_limits_pattern[i].reg,
394 __func__, probe_limits_pattern[i].reg,
395 i, value);
396
397 return -ENODEV;
398 }
399 }
400
401 return 0;
402}

--- 179 unchanged lines hidden --- 		395 i, value);
396
397 return -ENODEV;
398 }
399 }
400
401 return 0;
402}

--- 179 unchanged lines hidden ---