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1/*
2 * An SPI driver for the Philips PCF2123 RTC
3 * Copyright 2009 Cyber Switching, Inc.
4 *
5 * Author: Chris Verges <chrisv@cyberswitching.com>
6 * Maintainers: http://www.cyberswitching.com
7 *
8 * based on the RS5C348 driver in this same directory.
9 *
10 * Thanks to Christian Pellegrin <chripell@fsfe.org> for
11 * the sysfs contributions to this driver.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 * Please note that the CS is active high, so platform data
18 * should look something like:
19 *
20 * static struct spi_board_info ek_spi_devices[] = {
21 * ...
22 * {
23 * .modalias = "rtc-pcf2123",
24 * .chip_select = 1,
25 * .controller_data = (void *)AT91_PIN_PA10,
26 * .max_speed_hz = 1000 * 1000,
27 * .mode = SPI_CS_HIGH,
28 * .bus_num = 0,
29 * },
30 * ...
31 *};
32 *
33 */
34
35#include <linux/bcd.h>
36#include <linux/delay.h>
37#include <linux/device.h>
38#include <linux/errno.h>
39#include <linux/init.h>
40#include <linux/kernel.h>
41#include <linux/string.h>
42#include <linux/slab.h>
43#include <linux/rtc.h>
44#include <linux/spi/spi.h>
45
46#define DRV_VERSION "0.6"
47
48#define PCF2123_REG_CTRL1 (0x00) /* Control Register 1 */
49#define PCF2123_REG_CTRL2 (0x01) /* Control Register 2 */
50#define PCF2123_REG_SC (0x02) /* datetime */
51#define PCF2123_REG_MN (0x03)
52#define PCF2123_REG_HR (0x04)
53#define PCF2123_REG_DM (0x05)
54#define PCF2123_REG_DW (0x06)
55#define PCF2123_REG_MO (0x07)
56#define PCF2123_REG_YR (0x08)
57
58#define PCF2123_SUBADDR (1 << 4)
59#define PCF2123_WRITE ((0 << 7) | PCF2123_SUBADDR)
60#define PCF2123_READ ((1 << 7) | PCF2123_SUBADDR)
61
62static struct spi_driver pcf2123_driver;
63
64struct pcf2123_sysfs_reg {
65 struct device_attribute attr;
66 char name[2];
67};
68
69struct pcf2123_plat_data {
70 struct rtc_device *rtc;
71 struct pcf2123_sysfs_reg regs[16];
72};
73
74/*
75 * Causes a 30 nanosecond delay to ensure that the PCF2123 chip select
76 * is released properly after an SPI write. This function should be
77 * called after EVERY read/write call over SPI.
78 */
79static inline void pcf2123_delay_trec(void)
80{
81 ndelay(30);
82}
83
84static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr,
85 char *buffer)
86{
87 struct spi_device *spi = to_spi_device(dev);
88 struct pcf2123_sysfs_reg *r;
89 u8 txbuf[1], rxbuf[1];
90 unsigned long reg;
91 int ret;
92
93 r = container_of(attr, struct pcf2123_sysfs_reg, attr);
94
95 if (strict_strtoul(r->name, 16, ®))
96 return -EINVAL;
97
98 txbuf[0] = PCF2123_READ | reg;
99 ret = spi_write_then_read(spi, txbuf, 1, rxbuf, 1);
100 if (ret < 0)
101 return -EIO;
102 pcf2123_delay_trec();
103 return sprintf(buffer, "0x%x\n", rxbuf[0]);
104}
105
106static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
107 const char *buffer, size_t count) {
108 struct spi_device *spi = to_spi_device(dev);
109 struct pcf2123_sysfs_reg *r;
110 u8 txbuf[2];
111 unsigned long reg;
112 unsigned long val;
113
114 int ret;
115
116 r = container_of(attr, struct pcf2123_sysfs_reg, attr);
117
118 if (strict_strtoul(r->name, 16, ®)
119 || strict_strtoul(buffer, 10, &val))
120 return -EINVAL;
121
122 txbuf[0] = PCF2123_WRITE | reg;
123 txbuf[1] = val;
124 ret = spi_write(spi, txbuf, sizeof(txbuf));
125 if (ret < 0)
126 return -EIO;
127 pcf2123_delay_trec();
128 return count;
129}
130
131static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
132{
133 struct spi_device *spi = to_spi_device(dev);
134 u8 txbuf[1], rxbuf[7];
135 int ret;
136
137 txbuf[0] = PCF2123_READ | PCF2123_REG_SC;
138 ret = spi_write_then_read(spi, txbuf, sizeof(txbuf),
139 rxbuf, sizeof(rxbuf));
140 if (ret < 0)
141 return ret;
142 pcf2123_delay_trec();
143
144 tm->tm_sec = bcd2bin(rxbuf[0] & 0x7F);
145 tm->tm_min = bcd2bin(rxbuf[1] & 0x7F);
146 tm->tm_hour = bcd2bin(rxbuf[2] & 0x3F); /* rtc hr 0-23 */
147 tm->tm_mday = bcd2bin(rxbuf[3] & 0x3F);
148 tm->tm_wday = rxbuf[4] & 0x07;
149 tm->tm_mon = bcd2bin(rxbuf[5] & 0x1F) - 1; /* rtc mn 1-12 */
150 tm->tm_year = bcd2bin(rxbuf[6]);
151 if (tm->tm_year < 70)
152 tm->tm_year += 100; /* assume we are in 1970...2069 */
153
154 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
155 "mday=%d, mon=%d, year=%d, wday=%d\n",
156 __func__,
157 tm->tm_sec, tm->tm_min, tm->tm_hour,
158 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
159
160 /* the clock can give out invalid datetime, but we cannot return
161 * -EINVAL otherwise hwclock will refuse to set the time on bootup.
162 */
163 if (rtc_valid_tm(tm) < 0)
164 dev_err(dev, "retrieved date/time is not valid.\n");
165
166 return 0;
167}
168
169static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
170{
171 struct spi_device *spi = to_spi_device(dev);
172 u8 txbuf[8];
173 int ret;
174
175 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
176 "mday=%d, mon=%d, year=%d, wday=%d\n",
177 __func__,
178 tm->tm_sec, tm->tm_min, tm->tm_hour,
179 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
180
181 /* Stop the counter first */
182 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
183 txbuf[1] = 0x20;
184 ret = spi_write(spi, txbuf, 2);
185 if (ret < 0)
186 return ret;
187 pcf2123_delay_trec();
188
189 /* Set the new time */
190 txbuf[0] = PCF2123_WRITE | PCF2123_REG_SC;
191 txbuf[1] = bin2bcd(tm->tm_sec & 0x7F);
192 txbuf[2] = bin2bcd(tm->tm_min & 0x7F);
193 txbuf[3] = bin2bcd(tm->tm_hour & 0x3F);
194 txbuf[4] = bin2bcd(tm->tm_mday & 0x3F);
195 txbuf[5] = tm->tm_wday & 0x07;
196 txbuf[6] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
197 txbuf[7] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
198
199 ret = spi_write(spi, txbuf, sizeof(txbuf));
200 if (ret < 0)
201 return ret;
202 pcf2123_delay_trec();
203
204 /* Start the counter */
205 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
206 txbuf[1] = 0x00;
207 ret = spi_write(spi, txbuf, 2);
208 if (ret < 0)
209 return ret;
210 pcf2123_delay_trec();
211
212 return 0;
213}
214
215static const struct rtc_class_ops pcf2123_rtc_ops = {
216 .read_time = pcf2123_rtc_read_time,
217 .set_time = pcf2123_rtc_set_time,
218};
219
220static int __devinit pcf2123_probe(struct spi_device *spi)
221{
222 struct rtc_device *rtc;
223 struct pcf2123_plat_data *pdata;
224 u8 txbuf[2], rxbuf[2];
225 int ret, i;
226
227 pdata = kzalloc(sizeof(struct pcf2123_plat_data), GFP_KERNEL);
228 if (!pdata)
229 return -ENOMEM;
230 spi->dev.platform_data = pdata;
231
232 /* Send a software reset command */
233 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
234 txbuf[1] = 0x58;
235 dev_dbg(&spi->dev, "resetting RTC (0x%02X 0x%02X)\n",
236 txbuf[0], txbuf[1]);
237 ret = spi_write(spi, txbuf, 2 * sizeof(u8));
238 if (ret < 0)
239 goto kfree_exit;
240 pcf2123_delay_trec();
241
242 /* Stop the counter */
243 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
244 txbuf[1] = 0x20;
245 dev_dbg(&spi->dev, "stopping RTC (0x%02X 0x%02X)\n",
246 txbuf[0], txbuf[1]);
247 ret = spi_write(spi, txbuf, 2 * sizeof(u8));
248 if (ret < 0)
249 goto kfree_exit;
250 pcf2123_delay_trec();
251
252 /* See if the counter was actually stopped */
253 txbuf[0] = PCF2123_READ | PCF2123_REG_CTRL1;
254 dev_dbg(&spi->dev, "checking for presence of RTC (0x%02X)\n",
255 txbuf[0]);
256 ret = spi_write_then_read(spi, txbuf, 1 * sizeof(u8),
257 rxbuf, 2 * sizeof(u8));
258 dev_dbg(&spi->dev, "received data from RTC (0x%02X 0x%02X)\n",
259 rxbuf[0], rxbuf[1]);
260 if (ret < 0)
261 goto kfree_exit;
262 pcf2123_delay_trec();
263
264 if (!(rxbuf[0] & 0x20)) {
265 dev_err(&spi->dev, "chip not found\n");
266 goto kfree_exit;
267 }
268
269 dev_info(&spi->dev, "chip found, driver version " DRV_VERSION "\n");
270 dev_info(&spi->dev, "spiclk %u KHz.\n",
271 (spi->max_speed_hz + 500) / 1000);
272
273 /* Start the counter */
274 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
275 txbuf[1] = 0x00;
276 ret = spi_write(spi, txbuf, sizeof(txbuf));
277 if (ret < 0)
278 goto kfree_exit;
279 pcf2123_delay_trec();
280
281 /* Finalize the initialization */
282 rtc = rtc_device_register(pcf2123_driver.driver.name, &spi->dev,
283 &pcf2123_rtc_ops, THIS_MODULE);
284
285 if (IS_ERR(rtc)) {
286 dev_err(&spi->dev, "failed to register.\n");
287 ret = PTR_ERR(rtc);
288 goto kfree_exit;
289 }
290
291 pdata->rtc = rtc;
292
293 for (i = 0; i < 16; i++) {
294 sprintf(pdata->regs[i].name, "%1x", i);
295 pdata->regs[i].attr.attr.mode = S_IRUGO | S_IWUSR;
296 pdata->regs[i].attr.attr.name = pdata->regs[i].name;
297 pdata->regs[i].attr.show = pcf2123_show;
298 pdata->regs[i].attr.store = pcf2123_store;
299 ret = device_create_file(&spi->dev, &pdata->regs[i].attr);
300 if (ret) {
301 dev_err(&spi->dev, "Unable to create sysfs %s\n",
302 pdata->regs[i].name);
303 goto sysfs_exit;
304 }
305 }
306
307 return 0;
308
309sysfs_exit:
310 for (i--; i >= 0; i--)
311 device_remove_file(&spi->dev, &pdata->regs[i].attr);
312
313kfree_exit:
314 kfree(pdata);
315 spi->dev.platform_data = NULL;
316 return ret;
317}
318
319static int __devexit pcf2123_remove(struct spi_device *spi)
320{
321 struct pcf2123_plat_data *pdata = spi->dev.platform_data;
322 int i;
323
324 if (pdata) {
325 struct rtc_device *rtc = pdata->rtc;
326
327 if (rtc)
328 rtc_device_unregister(rtc);
329 for (i = 0; i < 16; i++)
330 if (pdata->regs[i].name[0])
331 device_remove_file(&spi->dev,
332 &pdata->regs[i].attr);
333 kfree(pdata);
334 }
335
336 return 0;
337}
338
339static struct spi_driver pcf2123_driver = {
340 .driver = {
341 .name = "rtc-pcf2123",
342 .bus = &spi_bus_type,
343 .owner = THIS_MODULE,
344 },
345 .probe = pcf2123_probe,
346 .remove = __devexit_p(pcf2123_remove),
347};
348
349static int __init pcf2123_init(void)
350{
351 return spi_register_driver(&pcf2123_driver);
352}
353
354static void __exit pcf2123_exit(void)
355{
356 spi_unregister_driver(&pcf2123_driver);
357}
358
359MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>");
360MODULE_DESCRIPTION("NXP PCF2123 RTC driver");
361MODULE_LICENSE("GPL");
362MODULE_VERSION(DRV_VERSION);
363
364module_init(pcf2123_init);
365module_exit(pcf2123_exit);
1/*
2 * An SPI driver for the Philips PCF2123 RTC
3 * Copyright 2009 Cyber Switching, Inc.
4 *
5 * Author: Chris Verges <chrisv@cyberswitching.com>
6 * Maintainers: http://www.cyberswitching.com
7 *
8 * based on the RS5C348 driver in this same directory.
9 *
10 * Thanks to Christian Pellegrin <chripell@fsfe.org> for
11 * the sysfs contributions to this driver.
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 *
17 * Please note that the CS is active high, so platform data
18 * should look something like:
19 *
20 * static struct spi_board_info ek_spi_devices[] = {
21 * ...
22 * {
23 * .modalias = "rtc-pcf2123",
24 * .chip_select = 1,
25 * .controller_data = (void *)AT91_PIN_PA10,
26 * .max_speed_hz = 1000 * 1000,
27 * .mode = SPI_CS_HIGH,
28 * .bus_num = 0,
29 * },
30 * ...
31 *};
32 *
33 */
34
35#include <linux/bcd.h>
36#include <linux/delay.h>
37#include <linux/device.h>
38#include <linux/errno.h>
39#include <linux/init.h>
40#include <linux/kernel.h>
41#include <linux/string.h>
42#include <linux/slab.h>
43#include <linux/rtc.h>
44#include <linux/spi/spi.h>
45#include <linux/module.h>
46#include <linux/sysfs.h>
47
48#define DRV_VERSION "0.6"
49
50#define PCF2123_REG_CTRL1 (0x00) /* Control Register 1 */
51#define PCF2123_REG_CTRL2 (0x01) /* Control Register 2 */
52#define PCF2123_REG_SC (0x02) /* datetime */
53#define PCF2123_REG_MN (0x03)
54#define PCF2123_REG_HR (0x04)
55#define PCF2123_REG_DM (0x05)
56#define PCF2123_REG_DW (0x06)
57#define PCF2123_REG_MO (0x07)
58#define PCF2123_REG_YR (0x08)
59
60#define PCF2123_SUBADDR (1 << 4)
61#define PCF2123_WRITE ((0 << 7) | PCF2123_SUBADDR)
62#define PCF2123_READ ((1 << 7) | PCF2123_SUBADDR)
63
64static struct spi_driver pcf2123_driver;
65
66struct pcf2123_sysfs_reg {
67 struct device_attribute attr;
68 char name[2];
69};
70
71struct pcf2123_plat_data {
72 struct rtc_device *rtc;
73 struct pcf2123_sysfs_reg regs[16];
74};
75
76/*
77 * Causes a 30 nanosecond delay to ensure that the PCF2123 chip select
78 * is released properly after an SPI write. This function should be
79 * called after EVERY read/write call over SPI.
80 */
81static inline void pcf2123_delay_trec(void)
82{
83 ndelay(30);
84}
85
86static ssize_t pcf2123_show(struct device *dev, struct device_attribute *attr,
87 char *buffer)
88{
89 struct spi_device *spi = to_spi_device(dev);
90 struct pcf2123_sysfs_reg *r;
91 u8 txbuf[1], rxbuf[1];
92 unsigned long reg;
93 int ret;
94
95 r = container_of(attr, struct pcf2123_sysfs_reg, attr);
96
97 ret = kstrtoul(r->name, 16, ®);
98 if (ret)
99 return ret;
100
101 txbuf[0] = PCF2123_READ | reg;
102 ret = spi_write_then_read(spi, txbuf, 1, rxbuf, 1);
103 if (ret < 0)
104 return -EIO;
105 pcf2123_delay_trec();
106 return sprintf(buffer, "0x%x\n", rxbuf[0]);
107}
108
109static ssize_t pcf2123_store(struct device *dev, struct device_attribute *attr,
110 const char *buffer, size_t count) {
111 struct spi_device *spi = to_spi_device(dev);
112 struct pcf2123_sysfs_reg *r;
113 u8 txbuf[2];
114 unsigned long reg;
115 unsigned long val;
116
117 int ret;
118
119 r = container_of(attr, struct pcf2123_sysfs_reg, attr);
120
121 ret = kstrtoul(r->name, 16, ®);
122 if (ret)
123 return ret;
124
125 ret = kstrtoul(buffer, 10, &val);
126 if (ret)
127 return ret;
128
129 txbuf[0] = PCF2123_WRITE | reg;
130 txbuf[1] = val;
131 ret = spi_write(spi, txbuf, sizeof(txbuf));
132 if (ret < 0)
133 return -EIO;
134 pcf2123_delay_trec();
135 return count;
136}
137
138static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
139{
140 struct spi_device *spi = to_spi_device(dev);
141 u8 txbuf[1], rxbuf[7];
142 int ret;
143
144 txbuf[0] = PCF2123_READ | PCF2123_REG_SC;
145 ret = spi_write_then_read(spi, txbuf, sizeof(txbuf),
146 rxbuf, sizeof(rxbuf));
147 if (ret < 0)
148 return ret;
149 pcf2123_delay_trec();
150
151 tm->tm_sec = bcd2bin(rxbuf[0] & 0x7F);
152 tm->tm_min = bcd2bin(rxbuf[1] & 0x7F);
153 tm->tm_hour = bcd2bin(rxbuf[2] & 0x3F); /* rtc hr 0-23 */
154 tm->tm_mday = bcd2bin(rxbuf[3] & 0x3F);
155 tm->tm_wday = rxbuf[4] & 0x07;
156 tm->tm_mon = bcd2bin(rxbuf[5] & 0x1F) - 1; /* rtc mn 1-12 */
157 tm->tm_year = bcd2bin(rxbuf[6]);
158 if (tm->tm_year < 70)
159 tm->tm_year += 100; /* assume we are in 1970...2069 */
160
161 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
162 "mday=%d, mon=%d, year=%d, wday=%d\n",
163 __func__,
164 tm->tm_sec, tm->tm_min, tm->tm_hour,
165 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
166
167 /* the clock can give out invalid datetime, but we cannot return
168 * -EINVAL otherwise hwclock will refuse to set the time on bootup.
169 */
170 if (rtc_valid_tm(tm) < 0)
171 dev_err(dev, "retrieved date/time is not valid.\n");
172
173 return 0;
174}
175
176static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
177{
178 struct spi_device *spi = to_spi_device(dev);
179 u8 txbuf[8];
180 int ret;
181
182 dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
183 "mday=%d, mon=%d, year=%d, wday=%d\n",
184 __func__,
185 tm->tm_sec, tm->tm_min, tm->tm_hour,
186 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
187
188 /* Stop the counter first */
189 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
190 txbuf[1] = 0x20;
191 ret = spi_write(spi, txbuf, 2);
192 if (ret < 0)
193 return ret;
194 pcf2123_delay_trec();
195
196 /* Set the new time */
197 txbuf[0] = PCF2123_WRITE | PCF2123_REG_SC;
198 txbuf[1] = bin2bcd(tm->tm_sec & 0x7F);
199 txbuf[2] = bin2bcd(tm->tm_min & 0x7F);
200 txbuf[3] = bin2bcd(tm->tm_hour & 0x3F);
201 txbuf[4] = bin2bcd(tm->tm_mday & 0x3F);
202 txbuf[5] = tm->tm_wday & 0x07;
203 txbuf[6] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
204 txbuf[7] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
205
206 ret = spi_write(spi, txbuf, sizeof(txbuf));
207 if (ret < 0)
208 return ret;
209 pcf2123_delay_trec();
210
211 /* Start the counter */
212 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
213 txbuf[1] = 0x00;
214 ret = spi_write(spi, txbuf, 2);
215 if (ret < 0)
216 return ret;
217 pcf2123_delay_trec();
218
219 return 0;
220}
221
222static const struct rtc_class_ops pcf2123_rtc_ops = {
223 .read_time = pcf2123_rtc_read_time,
224 .set_time = pcf2123_rtc_set_time,
225};
226
227static int pcf2123_probe(struct spi_device *spi)
228{
229 struct rtc_device *rtc;
230 struct pcf2123_plat_data *pdata;
231 u8 txbuf[2], rxbuf[2];
232 int ret, i;
233
234 pdata = devm_kzalloc(&spi->dev, sizeof(struct pcf2123_plat_data),
235 GFP_KERNEL);
236 if (!pdata)
237 return -ENOMEM;
238 spi->dev.platform_data = pdata;
239
240 /* Send a software reset command */
241 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
242 txbuf[1] = 0x58;
243 dev_dbg(&spi->dev, "resetting RTC (0x%02X 0x%02X)\n",
244 txbuf[0], txbuf[1]);
245 ret = spi_write(spi, txbuf, 2 * sizeof(u8));
246 if (ret < 0)
247 goto kfree_exit;
248 pcf2123_delay_trec();
249
250 /* Stop the counter */
251 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
252 txbuf[1] = 0x20;
253 dev_dbg(&spi->dev, "stopping RTC (0x%02X 0x%02X)\n",
254 txbuf[0], txbuf[1]);
255 ret = spi_write(spi, txbuf, 2 * sizeof(u8));
256 if (ret < 0)
257 goto kfree_exit;
258 pcf2123_delay_trec();
259
260 /* See if the counter was actually stopped */
261 txbuf[0] = PCF2123_READ | PCF2123_REG_CTRL1;
262 dev_dbg(&spi->dev, "checking for presence of RTC (0x%02X)\n",
263 txbuf[0]);
264 ret = spi_write_then_read(spi, txbuf, 1 * sizeof(u8),
265 rxbuf, 2 * sizeof(u8));
266 dev_dbg(&spi->dev, "received data from RTC (0x%02X 0x%02X)\n",
267 rxbuf[0], rxbuf[1]);
268 if (ret < 0)
269 goto kfree_exit;
270 pcf2123_delay_trec();
271
272 if (!(rxbuf[0] & 0x20)) {
273 dev_err(&spi->dev, "chip not found\n");
274 ret = -ENODEV;
275 goto kfree_exit;
276 }
277
278 dev_info(&spi->dev, "chip found, driver version " DRV_VERSION "\n");
279 dev_info(&spi->dev, "spiclk %u KHz.\n",
280 (spi->max_speed_hz + 500) / 1000);
281
282 /* Start the counter */
283 txbuf[0] = PCF2123_WRITE | PCF2123_REG_CTRL1;
284 txbuf[1] = 0x00;
285 ret = spi_write(spi, txbuf, sizeof(txbuf));
286 if (ret < 0)
287 goto kfree_exit;
288 pcf2123_delay_trec();
289
290 /* Finalize the initialization */
291 rtc = devm_rtc_device_register(&spi->dev, pcf2123_driver.driver.name,
292 &pcf2123_rtc_ops, THIS_MODULE);
293
294 if (IS_ERR(rtc)) {
295 dev_err(&spi->dev, "failed to register.\n");
296 ret = PTR_ERR(rtc);
297 goto kfree_exit;
298 }
299
300 pdata->rtc = rtc;
301
302 for (i = 0; i < 16; i++) {
303 sysfs_attr_init(&pdata->regs[i].attr.attr);
304 sprintf(pdata->regs[i].name, "%1x", i);
305 pdata->regs[i].attr.attr.mode = S_IRUGO | S_IWUSR;
306 pdata->regs[i].attr.attr.name = pdata->regs[i].name;
307 pdata->regs[i].attr.show = pcf2123_show;
308 pdata->regs[i].attr.store = pcf2123_store;
309 ret = device_create_file(&spi->dev, &pdata->regs[i].attr);
310 if (ret) {
311 dev_err(&spi->dev, "Unable to create sysfs %s\n",
312 pdata->regs[i].name);
313 goto sysfs_exit;
314 }
315 }
316
317 return 0;
318
319sysfs_exit:
320 for (i--; i >= 0; i--)
321 device_remove_file(&spi->dev, &pdata->regs[i].attr);
322
323kfree_exit:
324 spi->dev.platform_data = NULL;
325 return ret;
326}
327
328static int pcf2123_remove(struct spi_device *spi)
329{
330 struct pcf2123_plat_data *pdata = dev_get_platdata(&spi->dev);
331 int i;
332
333 if (pdata) {
334 for (i = 0; i < 16; i++)
335 if (pdata->regs[i].name[0])
336 device_remove_file(&spi->dev,
337 &pdata->regs[i].attr);
338 }
339
340 return 0;
341}
342
343static struct spi_driver pcf2123_driver = {
344 .driver = {
345 .name = "rtc-pcf2123",
346 .owner = THIS_MODULE,
347 },
348 .probe = pcf2123_probe,
349 .remove = pcf2123_remove,
350};
351
352module_spi_driver(pcf2123_driver);
353
354MODULE_AUTHOR("Chris Verges <chrisv@cyberswitching.com>");
355MODULE_DESCRIPTION("NXP PCF2123 RTC driver");
356MODULE_LICENSE("GPL");
357MODULE_VERSION(DRV_VERSION);