Root/target/linux/generic/patches-3.7/841-rtc_pt7c4338.patch

1--- a/drivers/rtc/Kconfig
2+++ b/drivers/rtc/Kconfig
3@@ -419,6 +419,15 @@ config RTC_DRV_RV3029C2
4       This driver can also be built as a module. If so, the module
5       will be called rtc-rv3029c2.
6 
7+config RTC_DRV_PT7C4338
8+ tristate "Pericom Technology Inc. PT7C4338 RTC"
9+ help
10+ If you say yes here you get support for the Pericom Technology
11+ Inc. PT7C4338 RTC chip.
12+
13+ This driver can also be built as a module. If so, the module
14+ will be called rtc-pt7c4338.
15+
16 endif # I2C
17 
18 comment "SPI RTC drivers"
19--- a/drivers/rtc/Makefile
20+++ b/drivers/rtc/Makefile
21@@ -84,6 +84,7 @@ obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030
22 obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o
23 obj-$(CONFIG_RTC_DRV_PM8XXX) += rtc-pm8xxx.o
24 obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o
25+obj-$(CONFIG_RTC_DRV_PT7C4338) += rtc-pt7c4338.o
26 obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o
27 obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o
28 obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o
29--- /dev/null
30+++ b/drivers/rtc/rtc-pt7c4338.c
31@@ -0,0 +1,216 @@
32+/*
33+ * Copyright 2010 Freescale Semiconductor, Inc.
34+ *
35+ * Author: Priyanka Jain <Priyanka.Jain@freescale.com>
36+ *
37+ * See file CREDITS for list of people who contributed to this
38+ * project.
39+ *
40+ * This program is free software; you can redistribute it and/or
41+ * modify it under the terms of the GNU General Public License as
42+ * published by the Free Software Foundation; either version 2 of
43+ * the License, or (at your option) any later version.
44+ *
45+ * This program is distributed in the hope that it will be useful,
46+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
47+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
48+ * GNU General Public License for more details.
49+ *
50+ * You should have received a copy of the GNU General Public License
51+ * along with this program; if not, write to the Free Software
52+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
53+ * MA 02111-1307 USA
54+ */
55+
56+/*
57+ * This file provides Date & Time support (no alarms) for PT7C4338 chip.
58+ *
59+ * This file is based on drivers/rtc/rtc-ds1307.c
60+ *
61+ * PT7C4338 chip is manufactured by Pericom Technology Inc.
62+ * It is a serial real-time clock which provides
63+ * 1)Low-power clock/calendar.
64+ * 2)Programmable square-wave output.
65+ * It has 56 bytes of nonvolatile RAM.
66+ */
67+
68+#include <linux/kernel.h>
69+#include <linux/module.h>
70+#include <linux/slab.h>
71+#include <linux/i2c.h>
72+#include <linux/rtc.h>
73+#include <linux/bcd.h>
74+
75+/* RTC register addresses */
76+#define PT7C4338_REG_SECONDS 0x00
77+#define PT7C4338_REG_MINUTES 0x01
78+#define PT7C4338_REG_HOURS 0x02
79+#define PT7C4338_REG_AMPM 0x02
80+#define PT7C4338_REG_DAY 0x03
81+#define PT7C4338_REG_DATE 0x04
82+#define PT7C4338_REG_MONTH 0x05
83+#define PT7C4338_REG_YEAR 0x06
84+#define PT7C4338_REG_CTRL_STAT 0x07
85+
86+/* RTC second register address bit */
87+#define PT7C4338_SEC_BIT_CH 0x80 /*Clock Halt (in Register 0)*/
88+
89+/* RTC control and status register bits */
90+#define PT7C4338_CTRL_STAT_BIT_RS0 0x1 /*Rate select 0*/
91+#define PT7C4338_CTRL_STAT_BIT_RS1 0x2 /*Rate select 1*/
92+#define PT7C4338_CTRL_STAT_BIT_SQWE 0x10 /*Square Wave Enable*/
93+#define PT7C4338_CTRL_STAT_BIT_OSF 0x20 /*Oscillator Stop Flag*/
94+#define PT7C4338_CTRL_STAT_BIT_OUT 0x80 /*Output Level Control*/
95+
96+static const struct i2c_device_id pt7c4338_id[] = {
97+ { "pt7c4338", 0 },
98+ { }
99+};
100+MODULE_DEVICE_TABLE(i2c, pt7c4338_id);
101+
102+struct pt7c4338{
103+ struct i2c_client *client;
104+ struct rtc_device *rtc;
105+};
106+
107+static int pt7c4338_read_time(struct device *dev, struct rtc_time *time)
108+{
109+ struct i2c_client *client = to_i2c_client(dev);
110+ int ret;
111+ u8 buf[7];
112+ u8 year, month, day, hour, minute, second;
113+ u8 week, twelve_hr, am_pm;
114+
115+ ret = i2c_smbus_read_i2c_block_data(client,
116+ PT7C4338_REG_SECONDS, 7, buf);
117+ if (ret < 0)
118+ return ret;
119+ if (ret < 7)
120+ return -EIO;
121+
122+ second = buf[0];
123+ minute = buf[1];
124+ hour = buf[2];
125+ week = buf[3];
126+ day = buf[4];
127+ month = buf[5];
128+ year = buf[6];
129+
130+ /* Extract additional information for AM/PM */
131+ twelve_hr = hour & 0x40;
132+ am_pm = hour & 0x20;
133+
134+ /* Write to rtc_time structure */
135+ time->tm_sec = bcd2bin(second & 0x7f);
136+ time->tm_min = bcd2bin(minute & 0x7f);
137+ if (twelve_hr) {
138+ /* Convert to 24 hr */
139+ if (am_pm)
140+ time->tm_hour = bcd2bin(hour & 0x10) + 12;
141+ else
142+ time->tm_hour = bcd2bin(hour & 0xBF);
143+ } else {
144+ time->tm_hour = bcd2bin(hour);
145+ }
146+
147+ time->tm_wday = bcd2bin(week & 0x07) - 1;
148+ time->tm_mday = bcd2bin(day & 0x3f);
149+ time->tm_mon = bcd2bin(month & 0x1F) - 1;
150+ /* assume 20YY not 19YY */
151+ time->tm_year = bcd2bin(year) + 100;
152+
153+ return 0;
154+}
155+
156+static int pt7c4338_set_time(struct device *dev, struct rtc_time *time)
157+{
158+ struct i2c_client *client = to_i2c_client(dev);
159+ u8 buf[7];
160+
161+ /* Extract time from rtc_time and load into pt7c4338*/
162+ buf[0] = bin2bcd(time->tm_sec);
163+ buf[1] = bin2bcd(time->tm_min);
164+ buf[2] = bin2bcd(time->tm_hour);
165+ buf[3] = bin2bcd(time->tm_wday + 1); /* Day of the week */
166+ buf[4] = bin2bcd(time->tm_mday); /* Date */
167+ buf[5] = bin2bcd(time->tm_mon + 1);
168+
169+ /* assume 20YY not 19YY */
170+ if (time->tm_year >= 100)
171+ buf[6] = bin2bcd(time->tm_year - 100);
172+ else
173+ buf[6] = bin2bcd(time->tm_year);
174+
175+ return i2c_smbus_write_i2c_block_data(client,
176+ PT7C4338_REG_SECONDS, 7, buf);
177+}
178+
179+static const struct rtc_class_ops pt7c4338_rtc_ops = {
180+ .read_time = pt7c4338_read_time,
181+ .set_time = pt7c4338_set_time,
182+};
183+
184+static int pt7c4338_probe(struct i2c_client *client,
185+ const struct i2c_device_id *id)
186+{
187+ struct pt7c4338 *pt7c4338;
188+ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
189+ int ret;
190+
191+ pt7c4338 = kzalloc(sizeof(struct pt7c4338), GFP_KERNEL);
192+ if (!pt7c4338)
193+ return -ENOMEM;
194+
195+ pt7c4338->client = client;
196+ i2c_set_clientdata(client, pt7c4338);
197+ pt7c4338->rtc = rtc_device_register(client->name, &client->dev,
198+ &pt7c4338_rtc_ops, THIS_MODULE);
199+ if (IS_ERR(pt7c4338->rtc)) {
200+ ret = PTR_ERR(pt7c4338->rtc);
201+ dev_err(&client->dev, "unable to register the class device\n");
202+ goto out_free;
203+ }
204+
205+ return 0;
206+out_free:
207+ i2c_set_clientdata(client, NULL);
208+ kfree(pt7c4338);
209+ return ret;
210+}
211+
212+static int __devexit pt7c4338_remove(struct i2c_client *client)
213+{
214+ struct pt7c4338 *pt7c4338 = i2c_get_clientdata(client);
215+
216+ rtc_device_unregister(pt7c4338->rtc);
217+ i2c_set_clientdata(client, NULL);
218+ kfree(pt7c4338);
219+ return 0;
220+}
221+
222+static struct i2c_driver pt7c4338_driver = {
223+ .driver = {
224+ .name = "rtc-pt7c4338",
225+ .owner = THIS_MODULE,
226+ },
227+ .probe = pt7c4338_probe,
228+ .remove = __devexit_p(pt7c4338_remove),
229+ .id_table = pt7c4338_id,
230+};
231+
232+static int __init pt7c4338_init(void)
233+{
234+ return i2c_add_driver(&pt7c4338_driver);
235+}
236+
237+static void __exit pt7c4338_exit(void)
238+{
239+ i2c_del_driver(&pt7c4338_driver);
240+}
241+
242+module_init(pt7c4338_init);
243+module_exit(pt7c4338_exit);
244+
245+MODULE_AUTHOR("Priyanka Jain <Priyanka.Jain@freescale.com>");
246+MODULE_DESCRIPTION("pericom Technology Inc. PT7C4338 RTC Driver");
247+MODULE_LICENSE("GPL");
248

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