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Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -07001/*
2 * Intersil ISL1208 rtc class driver
3 *
4 * Copyright 2005,2006 Hebert Valerio Riedel <hvr@gnu.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation; either version 2 of the License, or (at your
9 * option) any later version.
10 *
11 */
12
13#include <linux/module.h>
14#include <linux/i2c.h>
15#include <linux/bcd.h>
16#include <linux/rtc.h>
17
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070018#define DRV_VERSION "0.3"
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070019
20/* Register map */
21/* rtc section */
22#define ISL1208_REG_SC 0x00
23#define ISL1208_REG_MN 0x01
24#define ISL1208_REG_HR 0x02
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070025#define ISL1208_REG_HR_MIL (1<<7) /* 24h/12h mode */
26#define ISL1208_REG_HR_PM (1<<5) /* PM/AM bit in 12h mode */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070027#define ISL1208_REG_DT 0x03
28#define ISL1208_REG_MO 0x04
29#define ISL1208_REG_YR 0x05
30#define ISL1208_REG_DW 0x06
31#define ISL1208_RTC_SECTION_LEN 7
32
33/* control/status section */
34#define ISL1208_REG_SR 0x07
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070035#define ISL1208_REG_SR_ARST (1<<7) /* auto reset */
36#define ISL1208_REG_SR_XTOSCB (1<<6) /* crystal oscillator */
37#define ISL1208_REG_SR_WRTC (1<<4) /* write rtc */
38#define ISL1208_REG_SR_ALM (1<<2) /* alarm */
39#define ISL1208_REG_SR_BAT (1<<1) /* battery */
40#define ISL1208_REG_SR_RTCF (1<<0) /* rtc fail */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070041#define ISL1208_REG_INT 0x08
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070042#define ISL1208_REG_09 0x09 /* reserved */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070043#define ISL1208_REG_ATR 0x0a
44#define ISL1208_REG_DTR 0x0b
45
46/* alarm section */
47#define ISL1208_REG_SCA 0x0c
48#define ISL1208_REG_MNA 0x0d
49#define ISL1208_REG_HRA 0x0e
50#define ISL1208_REG_DTA 0x0f
51#define ISL1208_REG_MOA 0x10
52#define ISL1208_REG_DWA 0x11
53#define ISL1208_ALARM_SECTION_LEN 6
54
55/* user section */
56#define ISL1208_REG_USR1 0x12
57#define ISL1208_REG_USR2 0x13
58#define ISL1208_USR_SECTION_LEN 2
59
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070060static struct i2c_driver isl1208_driver;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070061
62/* block read */
63static int
64isl1208_i2c_read_regs(struct i2c_client *client, u8 reg, u8 buf[],
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070065 unsigned len)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070066{
67 u8 reg_addr[1] = { reg };
68 struct i2c_msg msgs[2] = {
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070069 {client->addr, 0, sizeof(reg_addr), reg_addr}
70 ,
71 {client->addr, I2C_M_RD, len, buf}
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070072 };
73 int ret;
74
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070075 BUG_ON(reg > ISL1208_REG_USR2);
76 BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
77
78 ret = i2c_transfer(client->adapter, msgs, 2);
79 if (ret > 0)
80 ret = 0;
81 return ret;
82}
83
84/* block write */
85static int
86isl1208_i2c_set_regs(struct i2c_client *client, u8 reg, u8 const buf[],
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070087 unsigned len)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070088{
89 u8 i2c_buf[ISL1208_REG_USR2 + 2];
90 struct i2c_msg msgs[1] = {
Alessandro Zummo9edae7b2008-04-28 02:11:53 -070091 {client->addr, 0, len + 1, i2c_buf}
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070092 };
93 int ret;
94
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -070095 BUG_ON(reg > ISL1208_REG_USR2);
96 BUG_ON(reg + len > ISL1208_REG_USR2 + 1);
97
98 i2c_buf[0] = reg;
99 memcpy(&i2c_buf[1], &buf[0], len);
100
101 ret = i2c_transfer(client->adapter, msgs, 1);
102 if (ret > 0)
103 ret = 0;
104 return ret;
105}
106
107/* simple check to see wether we have a isl1208 */
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700108static int
109isl1208_i2c_validate_client(struct i2c_client *client)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700110{
111 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
112 u8 zero_mask[ISL1208_RTC_SECTION_LEN] = {
113 0x80, 0x80, 0x40, 0xc0, 0xe0, 0x00, 0xf8
114 };
115 int i;
116 int ret;
117
118 ret = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
119 if (ret < 0)
120 return ret;
121
122 for (i = 0; i < ISL1208_RTC_SECTION_LEN; ++i) {
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700123 if (regs[i] & zero_mask[i]) /* check if bits are cleared */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700124 return -ENODEV;
125 }
126
127 return 0;
128}
129
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700130static int
131isl1208_i2c_get_sr(struct i2c_client *client)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700132{
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700133 int sr = i2c_smbus_read_byte_data(client, ISL1208_REG_SR);
134 if (sr < 0)
135 return -EIO;
136
137 return sr;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700138}
139
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700140static int
141isl1208_i2c_get_atr(struct i2c_client *client)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700142{
143 int atr = i2c_smbus_read_byte_data(client, ISL1208_REG_ATR);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700144 if (atr < 0)
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700145 return atr;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700146
147 /* The 6bit value in the ATR register controls the load
148 * capacitance C_load * in steps of 0.25pF
149 *
150 * bit (1<<5) of the ATR register is inverted
151 *
152 * C_load(ATR=0x20) = 4.50pF
153 * C_load(ATR=0x00) = 12.50pF
154 * C_load(ATR=0x1f) = 20.25pF
155 *
156 */
157
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700158 atr &= 0x3f; /* mask out lsb */
159 atr ^= 1 << 5; /* invert 6th bit */
160 atr += 2 * 9; /* add offset of 4.5pF; unit[atr] = 0.25pF */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700161
162 return atr;
163}
164
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700165static int
166isl1208_i2c_get_dtr(struct i2c_client *client)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700167{
168 int dtr = i2c_smbus_read_byte_data(client, ISL1208_REG_DTR);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700169 if (dtr < 0)
170 return -EIO;
171
172 /* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700173 dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700174
175 return dtr;
176}
177
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700178static int
179isl1208_i2c_get_usr(struct i2c_client *client)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700180{
181 u8 buf[ISL1208_USR_SECTION_LEN] = { 0, };
182 int ret;
183
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700184 ret = isl1208_i2c_read_regs(client, ISL1208_REG_USR1, buf,
185 ISL1208_USR_SECTION_LEN);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700186 if (ret < 0)
187 return ret;
188
189 return (buf[1] << 8) | buf[0];
190}
191
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700192static int
193isl1208_i2c_set_usr(struct i2c_client *client, u16 usr)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700194{
195 u8 buf[ISL1208_USR_SECTION_LEN];
196
197 buf[0] = usr & 0xff;
198 buf[1] = (usr >> 8) & 0xff;
199
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700200 return isl1208_i2c_set_regs(client, ISL1208_REG_USR1, buf,
201 ISL1208_USR_SECTION_LEN);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700202}
203
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700204static int
205isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700206{
207 struct i2c_client *const client = to_i2c_client(dev);
208 int sr, dtr, atr, usr;
209
210 sr = isl1208_i2c_get_sr(client);
211 if (sr < 0) {
212 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
213 return sr;
214 }
215
216 seq_printf(seq, "status_reg\t:%s%s%s%s%s%s (0x%.2x)\n",
217 (sr & ISL1208_REG_SR_RTCF) ? " RTCF" : "",
218 (sr & ISL1208_REG_SR_BAT) ? " BAT" : "",
219 (sr & ISL1208_REG_SR_ALM) ? " ALM" : "",
220 (sr & ISL1208_REG_SR_WRTC) ? " WRTC" : "",
221 (sr & ISL1208_REG_SR_XTOSCB) ? " XTOSCB" : "",
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700222 (sr & ISL1208_REG_SR_ARST) ? " ARST" : "", sr);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700223
224 seq_printf(seq, "batt_status\t: %s\n",
225 (sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
226
227 dtr = isl1208_i2c_get_dtr(client);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700228 if (dtr >= 0 - 1)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700229 seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
230
231 atr = isl1208_i2c_get_atr(client);
232 if (atr >= 0)
233 seq_printf(seq, "analog_trim\t: %d.%.2d pF\n",
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700234 atr >> 2, (atr & 0x3) * 25);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700235
236 usr = isl1208_i2c_get_usr(client);
237 if (usr >= 0)
238 seq_printf(seq, "user_data\t: 0x%.4x\n", usr);
239
240 return 0;
241}
242
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700243static int
244isl1208_i2c_read_time(struct i2c_client *client, struct rtc_time *tm)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700245{
246 int sr;
247 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
248
249 sr = isl1208_i2c_get_sr(client);
250 if (sr < 0) {
251 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
252 return -EIO;
253 }
254
255 sr = isl1208_i2c_read_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
256 if (sr < 0) {
257 dev_err(&client->dev, "%s: reading RTC section failed\n",
258 __func__);
259 return sr;
260 }
261
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700262 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SC]);
263 tm->tm_min = bcd2bin(regs[ISL1208_REG_MN]);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700264
265 /* HR field has a more complex interpretation */
266 {
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700267 const u8 _hr = regs[ISL1208_REG_HR];
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700268 if (_hr & ISL1208_REG_HR_MIL) /* 24h format */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700269 tm->tm_hour = bcd2bin(_hr & 0x3f);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700270 else {
271 /* 12h format */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700272 tm->tm_hour = bcd2bin(_hr & 0x1f);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700273 if (_hr & ISL1208_REG_HR_PM) /* PM flag set */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700274 tm->tm_hour += 12;
275 }
276 }
277
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700278 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DT]);
279 tm->tm_mon = bcd2bin(regs[ISL1208_REG_MO]) - 1; /* rtc starts at 1 */
280 tm->tm_year = bcd2bin(regs[ISL1208_REG_YR]) + 100;
281 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DW]);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700282
283 return 0;
284}
285
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700286static int
287isl1208_i2c_read_alarm(struct i2c_client *client, struct rtc_wkalrm *alarm)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700288{
289 struct rtc_time *const tm = &alarm->time;
290 u8 regs[ISL1208_ALARM_SECTION_LEN] = { 0, };
291 int sr;
292
293 sr = isl1208_i2c_get_sr(client);
294 if (sr < 0) {
295 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
296 return sr;
297 }
298
299 sr = isl1208_i2c_read_regs(client, ISL1208_REG_SCA, regs,
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700300 ISL1208_ALARM_SECTION_LEN);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700301 if (sr < 0) {
302 dev_err(&client->dev, "%s: reading alarm section failed\n",
303 __func__);
304 return sr;
305 }
306
307 /* MSB of each alarm register is an enable bit */
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700308 tm->tm_sec = bcd2bin(regs[ISL1208_REG_SCA - ISL1208_REG_SCA] & 0x7f);
309 tm->tm_min = bcd2bin(regs[ISL1208_REG_MNA - ISL1208_REG_SCA] & 0x7f);
310 tm->tm_hour = bcd2bin(regs[ISL1208_REG_HRA - ISL1208_REG_SCA] & 0x3f);
311 tm->tm_mday = bcd2bin(regs[ISL1208_REG_DTA - ISL1208_REG_SCA] & 0x3f);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700312 tm->tm_mon =
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700313 bcd2bin(regs[ISL1208_REG_MOA - ISL1208_REG_SCA] & 0x1f) - 1;
314 tm->tm_wday = bcd2bin(regs[ISL1208_REG_DWA - ISL1208_REG_SCA] & 0x03);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700315
316 return 0;
317}
318
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700319static int
320isl1208_rtc_read_time(struct device *dev, struct rtc_time *tm)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700321{
322 return isl1208_i2c_read_time(to_i2c_client(dev), tm);
323}
324
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700325static int
326isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700327{
328 int sr;
329 u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
330
Chris Elstoncc6c2ca2008-12-23 13:57:10 -0800331 /* The clock has an 8 bit wide bcd-coded register (they never learn)
332 * for the year. tm_year is an offset from 1900 and we are interested
333 * in the 2000-2099 range, so any value less than 100 is invalid.
334 */
335 if (tm->tm_year < 100)
336 return -EINVAL;
337
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700338 regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
339 regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
340 regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700341
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700342 regs[ISL1208_REG_DT] = bin2bcd(tm->tm_mday);
343 regs[ISL1208_REG_MO] = bin2bcd(tm->tm_mon + 1);
344 regs[ISL1208_REG_YR] = bin2bcd(tm->tm_year - 100);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700345
Adrian Bunkfe20ba72008-10-18 20:28:41 -0700346 regs[ISL1208_REG_DW] = bin2bcd(tm->tm_wday & 7);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700347
348 sr = isl1208_i2c_get_sr(client);
349 if (sr < 0) {
350 dev_err(&client->dev, "%s: reading SR failed\n", __func__);
351 return sr;
352 }
353
354 /* set WRTC */
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700355 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700356 sr | ISL1208_REG_SR_WRTC);
357 if (sr < 0) {
358 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
359 return sr;
360 }
361
362 /* write RTC registers */
363 sr = isl1208_i2c_set_regs(client, 0, regs, ISL1208_RTC_SECTION_LEN);
364 if (sr < 0) {
365 dev_err(&client->dev, "%s: writing RTC section failed\n",
366 __func__);
367 return sr;
368 }
369
370 /* clear WRTC again */
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700371 sr = i2c_smbus_write_byte_data(client, ISL1208_REG_SR,
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700372 sr & ~ISL1208_REG_SR_WRTC);
373 if (sr < 0) {
374 dev_err(&client->dev, "%s: writing SR failed\n", __func__);
375 return sr;
376 }
377
378 return 0;
379}
380
381
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700382static int
383isl1208_rtc_set_time(struct device *dev, struct rtc_time *tm)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700384{
385 return isl1208_i2c_set_time(to_i2c_client(dev), tm);
386}
387
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700388static int
389isl1208_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700390{
391 return isl1208_i2c_read_alarm(to_i2c_client(dev), alarm);
392}
393
David Brownellff8371a2006-09-30 23:28:17 -0700394static const struct rtc_class_ops isl1208_rtc_ops = {
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700395 .proc = isl1208_rtc_proc,
396 .read_time = isl1208_rtc_read_time,
397 .set_time = isl1208_rtc_set_time,
398 .read_alarm = isl1208_rtc_read_alarm,
399 /*.set_alarm = isl1208_rtc_set_alarm, */
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700400};
401
402/* sysfs interface */
403
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700404static ssize_t
405isl1208_sysfs_show_atrim(struct device *dev,
406 struct device_attribute *attr, char *buf)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700407{
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700408 int atr = isl1208_i2c_get_atr(to_i2c_client(dev));
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700409 if (atr < 0)
410 return atr;
411
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700412 return sprintf(buf, "%d.%.2d pF\n", atr >> 2, (atr & 0x3) * 25);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700413}
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700414
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700415static DEVICE_ATTR(atrim, S_IRUGO, isl1208_sysfs_show_atrim, NULL);
416
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700417static ssize_t
418isl1208_sysfs_show_dtrim(struct device *dev,
419 struct device_attribute *attr, char *buf)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700420{
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700421 int dtr = isl1208_i2c_get_dtr(to_i2c_client(dev));
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700422 if (dtr < 0)
423 return dtr;
424
425 return sprintf(buf, "%d ppm\n", dtr);
426}
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700427
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700428static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);
429
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700430static ssize_t
431isl1208_sysfs_show_usr(struct device *dev,
432 struct device_attribute *attr, char *buf)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700433{
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700434 int usr = isl1208_i2c_get_usr(to_i2c_client(dev));
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700435 if (usr < 0)
436 return usr;
437
438 return sprintf(buf, "0x%.4x\n", usr);
439}
440
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700441static ssize_t
442isl1208_sysfs_store_usr(struct device *dev,
443 struct device_attribute *attr,
444 const char *buf, size_t count)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700445{
446 int usr = -1;
447
448 if (buf[0] == '0' && (buf[1] == 'x' || buf[1] == 'X')) {
449 if (sscanf(buf, "%x", &usr) != 1)
450 return -EINVAL;
451 } else {
452 if (sscanf(buf, "%d", &usr) != 1)
453 return -EINVAL;
454 }
455
456 if (usr < 0 || usr > 0xffff)
457 return -EINVAL;
458
459 return isl1208_i2c_set_usr(to_i2c_client(dev), usr) ? -EIO : count;
460}
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700461
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700462static DEVICE_ATTR(usr, S_IRUGO | S_IWUSR, isl1208_sysfs_show_usr,
463 isl1208_sysfs_store_usr);
464
H Hartley Sweetene17ab5c2010-05-24 14:33:46 -0700465static struct attribute *isl1208_rtc_attrs[] = {
466 &dev_attr_atrim.attr,
467 &dev_attr_dtrim.attr,
468 &dev_attr_usr.attr,
469 NULL
470};
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700471
H Hartley Sweetene17ab5c2010-05-24 14:33:46 -0700472static const struct attribute_group isl1208_rtc_sysfs_files = {
473 .attrs = isl1208_rtc_attrs,
474};
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700475
476static int
Jean Delvared2653e92008-04-29 23:11:39 +0200477isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700478{
479 int rc = 0;
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700480 struct rtc_device *rtc;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700481
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700482 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
483 return -ENODEV;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700484
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700485 if (isl1208_i2c_validate_client(client) < 0)
486 return -ENODEV;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700487
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700488 dev_info(&client->dev,
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700489 "chip found, driver version " DRV_VERSION "\n");
490
491 rtc = rtc_device_register(isl1208_driver.driver.name,
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700492 &client->dev, &isl1208_rtc_ops,
493 THIS_MODULE);
494 if (IS_ERR(rtc))
495 return PTR_ERR(rtc);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700496
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700497 i2c_set_clientdata(client, rtc);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700498
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700499 rc = isl1208_i2c_get_sr(client);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700500 if (rc < 0) {
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700501 dev_err(&client->dev, "reading status failed\n");
502 goto exit_unregister;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700503 }
504
505 if (rc & ISL1208_REG_SR_RTCF)
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700506 dev_warn(&client->dev, "rtc power failure detected, "
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700507 "please set clock.\n");
508
H Hartley Sweetene17ab5c2010-05-24 14:33:46 -0700509 rc = sysfs_create_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700510 if (rc)
511 goto exit_unregister;
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700512
513 return 0;
514
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700515exit_unregister:
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700516 rtc_device_unregister(rtc);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700517
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700518 return rc;
519}
520
521static int
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700522isl1208_remove(struct i2c_client *client)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700523{
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700524 struct rtc_device *rtc = i2c_get_clientdata(client);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700525
H Hartley Sweetene17ab5c2010-05-24 14:33:46 -0700526 sysfs_remove_group(&client->dev.kobj, &isl1208_rtc_sysfs_files);
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700527 rtc_device_unregister(rtc);
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700528
529 return 0;
530}
531
Jean Delvare3760f732008-04-29 23:11:40 +0200532static const struct i2c_device_id isl1208_id[] = {
533 { "isl1208", 0 },
534 { }
535};
536MODULE_DEVICE_TABLE(i2c, isl1208_id);
537
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700538static struct i2c_driver isl1208_driver = {
539 .driver = {
540 .name = "rtc-isl1208",
541 },
542 .probe = isl1208_probe,
543 .remove = isl1208_remove,
Jean Delvare3760f732008-04-29 23:11:40 +0200544 .id_table = isl1208_id,
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700545};
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700546
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700547static int __init
548isl1208_init(void)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700549{
550 return i2c_add_driver(&isl1208_driver);
551}
552
Alessandro Zummo9edae7b2008-04-28 02:11:53 -0700553static void __exit
554isl1208_exit(void)
Herbert Valerio Riedel7e56a7d2006-07-14 00:24:11 -0700555{
556 i2c_del_driver(&isl1208_driver);
557}
558
559MODULE_AUTHOR("Herbert Valerio Riedel <hvr@gnu.org>");
560MODULE_DESCRIPTION("Intersil ISL1208 RTC driver");
561MODULE_LICENSE("GPL");
562MODULE_VERSION(DRV_VERSION);
563
564module_init(isl1208_init);
565module_exit(isl1208_exit);