| 1 | --- a/drivers/rtc/Kconfig |
| 2 | +++ b/drivers/rtc/Kconfig |
| 3 | @@ -389,6 +389,15 @@ 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 | @@ -82,6 +82,7 @@ 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 | |
