diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/841-rtc_pt7c4338.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/841-rtc_pt7c4338.patch | 247 |
1 files changed, 247 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/841-rtc_pt7c4338.patch b/target/linux/generic/patches-4.4/841-rtc_pt7c4338.patch new file mode 100644 index 0000000000..4235efa38a --- /dev/null +++ b/target/linux/generic/patches-4.4/841-rtc_pt7c4338.patch @@ -0,0 +1,247 @@ +--- a/drivers/rtc/Kconfig ++++ b/drivers/rtc/Kconfig +@@ -612,6 +612,15 @@ config RTC_DRV_S5M + This driver can also be built as a module. If so, the module + will be called rtc-s5m. + ++config RTC_DRV_PT7C4338 ++ tristate "Pericom Technology Inc. PT7C4338 RTC" ++ help ++ If you say yes here you get support for the Pericom Technology ++ Inc. PT7C4338 RTC chip. ++ ++ This driver can also be built as a module. If so, the module ++ will be called rtc-pt7c4338. ++ + endif # I2C + + comment "SPI RTC drivers" +--- a/drivers/rtc/Makefile ++++ b/drivers/rtc/Makefile +@@ -116,6 +116,7 @@ obj-$(CONFIG_RTC_DRV_PL030) += rtc-pl030 + obj-$(CONFIG_RTC_DRV_PL031) += rtc-pl031.o + obj-$(CONFIG_RTC_DRV_PM8XXX) += rtc-pm8xxx.o + obj-$(CONFIG_RTC_DRV_PS3) += rtc-ps3.o ++obj-$(CONFIG_RTC_DRV_PT7C4338) += rtc-pt7c4338.o + obj-$(CONFIG_RTC_DRV_PUV3) += rtc-puv3.o + obj-$(CONFIG_RTC_DRV_PXA) += rtc-pxa.o + obj-$(CONFIG_RTC_DRV_R9701) += rtc-r9701.o +--- /dev/null ++++ b/drivers/rtc/rtc-pt7c4338.c +@@ -0,0 +1,216 @@ ++/* ++ * Copyright 2010 Freescale Semiconductor, Inc. ++ * ++ * Author: Priyanka Jain <Priyanka.Jain@freescale.com> ++ * ++ * See file CREDITS for list of people who contributed to this ++ * project. ++ * ++ * This program is free software; you can redistribute it and/or ++ * modify it under the terms of the GNU General Public License as ++ * published by the Free Software Foundation; either version 2 of ++ * the License, or (at your option) any later version. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the ++ * GNU General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this program; if not, write to the Free Software ++ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, ++ * MA 02111-1307 USA ++ */ ++ ++/* ++ * This file provides Date & Time support (no alarms) for PT7C4338 chip. ++ * ++ * This file is based on drivers/rtc/rtc-ds1307.c ++ * ++ * PT7C4338 chip is manufactured by Pericom Technology Inc. ++ * It is a serial real-time clock which provides ++ * 1)Low-power clock/calendar. ++ * 2)Programmable square-wave output. ++ * It has 56 bytes of nonvolatile RAM. ++ */ ++ ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/slab.h> ++#include <linux/i2c.h> ++#include <linux/rtc.h> ++#include <linux/bcd.h> ++ ++/* RTC register addresses */ ++#define PT7C4338_REG_SECONDS 0x00 ++#define PT7C4338_REG_MINUTES 0x01 ++#define PT7C4338_REG_HOURS 0x02 ++#define PT7C4338_REG_AMPM 0x02 ++#define PT7C4338_REG_DAY 0x03 ++#define PT7C4338_REG_DATE 0x04 ++#define PT7C4338_REG_MONTH 0x05 ++#define PT7C4338_REG_YEAR 0x06 ++#define PT7C4338_REG_CTRL_STAT 0x07 ++ ++/* RTC second register address bit */ ++#define PT7C4338_SEC_BIT_CH 0x80 /*Clock Halt (in Register 0)*/ ++ ++/* RTC control and status register bits */ ++#define PT7C4338_CTRL_STAT_BIT_RS0 0x1 /*Rate select 0*/ ++#define PT7C4338_CTRL_STAT_BIT_RS1 0x2 /*Rate select 1*/ ++#define PT7C4338_CTRL_STAT_BIT_SQWE 0x10 /*Square Wave Enable*/ ++#define PT7C4338_CTRL_STAT_BIT_OSF 0x20 /*Oscillator Stop Flag*/ ++#define PT7C4338_CTRL_STAT_BIT_OUT 0x80 /*Output Level Control*/ ++ ++static const struct i2c_device_id pt7c4338_id[] = { ++ { "pt7c4338", 0 }, ++ { } ++}; ++MODULE_DEVICE_TABLE(i2c, pt7c4338_id); ++ ++struct pt7c4338{ ++ struct i2c_client *client; ++ struct rtc_device *rtc; ++}; ++ ++static int pt7c4338_read_time(struct device *dev, struct rtc_time *time) ++{ ++ struct i2c_client *client = to_i2c_client(dev); ++ int ret; ++ u8 buf[7]; ++ u8 year, month, day, hour, minute, second; ++ u8 week, twelve_hr, am_pm; ++ ++ ret = i2c_smbus_read_i2c_block_data(client, ++ PT7C4338_REG_SECONDS, 7, buf); ++ if (ret < 0) ++ return ret; ++ if (ret < 7) ++ return -EIO; ++ ++ second = buf[0]; ++ minute = buf[1]; ++ hour = buf[2]; ++ week = buf[3]; ++ day = buf[4]; ++ month = buf[5]; ++ year = buf[6]; ++ ++ /* Extract additional information for AM/PM */ ++ twelve_hr = hour & 0x40; ++ am_pm = hour & 0x20; ++ ++ /* Write to rtc_time structure */ ++ time->tm_sec = bcd2bin(second & 0x7f); ++ time->tm_min = bcd2bin(minute & 0x7f); ++ if (twelve_hr) { ++ /* Convert to 24 hr */ ++ if (am_pm) ++ time->tm_hour = bcd2bin(hour & 0x10) + 12; ++ else ++ time->tm_hour = bcd2bin(hour & 0xBF); ++ } else { ++ time->tm_hour = bcd2bin(hour); ++ } ++ ++ time->tm_wday = bcd2bin(week & 0x07) - 1; ++ time->tm_mday = bcd2bin(day & 0x3f); ++ time->tm_mon = bcd2bin(month & 0x1F) - 1; ++ /* assume 20YY not 19YY */ ++ time->tm_year = bcd2bin(year) + 100; ++ ++ return 0; ++} ++ ++static int pt7c4338_set_time(struct device *dev, struct rtc_time *time) ++{ ++ struct i2c_client *client = to_i2c_client(dev); ++ u8 buf[7]; ++ ++ /* Extract time from rtc_time and load into pt7c4338*/ ++ buf[0] = bin2bcd(time->tm_sec); ++ buf[1] = bin2bcd(time->tm_min); ++ buf[2] = bin2bcd(time->tm_hour); ++ buf[3] = bin2bcd(time->tm_wday + 1); /* Day of the week */ ++ buf[4] = bin2bcd(time->tm_mday); /* Date */ ++ buf[5] = bin2bcd(time->tm_mon + 1); ++ ++ /* assume 20YY not 19YY */ ++ if (time->tm_year >= 100) ++ buf[6] = bin2bcd(time->tm_year - 100); ++ else ++ buf[6] = bin2bcd(time->tm_year); ++ ++ return i2c_smbus_write_i2c_block_data(client, ++ PT7C4338_REG_SECONDS, 7, buf); ++} ++ ++static const struct rtc_class_ops pt7c4338_rtc_ops = { ++ .read_time = pt7c4338_read_time, ++ .set_time = pt7c4338_set_time, ++}; ++ ++static int pt7c4338_probe(struct i2c_client *client, ++ const struct i2c_device_id *id) ++{ ++ struct pt7c4338 *pt7c4338; ++ struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); ++ int ret; ++ ++ pt7c4338 = kzalloc(sizeof(struct pt7c4338), GFP_KERNEL); ++ if (!pt7c4338) ++ return -ENOMEM; ++ ++ pt7c4338->client = client; ++ i2c_set_clientdata(client, pt7c4338); ++ pt7c4338->rtc = rtc_device_register(client->name, &client->dev, ++ &pt7c4338_rtc_ops, THIS_MODULE); ++ if (IS_ERR(pt7c4338->rtc)) { ++ ret = PTR_ERR(pt7c4338->rtc); ++ dev_err(&client->dev, "unable to register the class device\n"); ++ goto out_free; ++ } ++ ++ return 0; ++out_free: ++ i2c_set_clientdata(client, NULL); ++ kfree(pt7c4338); ++ return ret; ++} ++ ++static int pt7c4338_remove(struct i2c_client *client) ++{ ++ struct pt7c4338 *pt7c4338 = i2c_get_clientdata(client); ++ ++ rtc_device_unregister(pt7c4338->rtc); ++ i2c_set_clientdata(client, NULL); ++ kfree(pt7c4338); ++ return 0; ++} ++ ++static struct i2c_driver pt7c4338_driver = { ++ .driver = { ++ .name = "rtc-pt7c4338", ++ .owner = THIS_MODULE, ++ }, ++ .probe = pt7c4338_probe, ++ .remove = pt7c4338_remove, ++ .id_table = pt7c4338_id, ++}; ++ ++static int __init pt7c4338_init(void) ++{ ++ return i2c_add_driver(&pt7c4338_driver); ++} ++ ++static void __exit pt7c4338_exit(void) ++{ ++ i2c_del_driver(&pt7c4338_driver); ++} ++ ++module_init(pt7c4338_init); ++module_exit(pt7c4338_exit); ++ ++MODULE_AUTHOR("Priyanka Jain <Priyanka.Jain@freescale.com>"); ++MODULE_DESCRIPTION("pericom Technology Inc. PT7C4338 RTC Driver"); ++MODULE_LICENSE("GPL"); |