diff options
Diffstat (limited to 'drivers/i2c/chips/m41t00.c')
| -rw-r--r-- | drivers/i2c/chips/m41t00.c | 243 |
1 files changed, 0 insertions, 243 deletions
diff --git a/drivers/i2c/chips/m41t00.c b/drivers/i2c/chips/m41t00.c deleted file mode 100644 index 778d7e12859..00000000000 --- a/drivers/i2c/chips/m41t00.c +++ /dev/null @@ -1,243 +0,0 @@ -/* - * drivers/i2c/chips/m41t00.c - * - * I2C client/driver for the ST M41T00 Real-Time Clock chip. - * - * Author: Mark A. Greer <mgreer@mvista.com> - * - * 2005 (c) MontaVista Software, Inc. This file is licensed under - * the terms of the GNU General Public License version 2. This program - * is licensed "as is" without any warranty of any kind, whether express - * or implied. - */ -/* - * This i2c client/driver wedges between the drivers/char/genrtc.c RTC - * interface and the SMBus interface of the i2c subsystem. - * It would be more efficient to use i2c msgs/i2c_transfer directly but, as - * recommened in .../Documentation/i2c/writing-clients section - * "Sending and receiving", using SMBus level communication is preferred. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/interrupt.h> -#include <linux/i2c.h> -#include <linux/rtc.h> -#include <linux/bcd.h> - -#include <asm/time.h> -#include <asm/rtc.h> - -#define M41T00_DRV_NAME "m41t00" - -static DECLARE_MUTEX(m41t00_mutex); - -static struct i2c_driver m41t00_driver; -static struct i2c_client *save_client; - -static unsigned short ignore[] = { I2C_CLIENT_END }; -static unsigned short normal_addr[] = { 0x68, I2C_CLIENT_END }; - -static struct i2c_client_address_data addr_data = { - .normal_i2c = normal_addr, - .probe = ignore, - .ignore = ignore, - .force = ignore, -}; - -ulong -m41t00_get_rtc_time(void) -{ - s32 sec, min, hour, day, mon, year; - s32 sec1, min1, hour1, day1, mon1, year1; - ulong limit = 10; - - sec = min = hour = day = mon = year = 0; - sec1 = min1 = hour1 = day1 = mon1 = year1 = 0; - - down(&m41t00_mutex); - do { - if (((sec = i2c_smbus_read_byte_data(save_client, 0)) >= 0) - && ((min = i2c_smbus_read_byte_data(save_client, 1)) - >= 0) - && ((hour = i2c_smbus_read_byte_data(save_client, 2)) - >= 0) - && ((day = i2c_smbus_read_byte_data(save_client, 4)) - >= 0) - && ((mon = i2c_smbus_read_byte_data(save_client, 5)) - >= 0) - && ((year = i2c_smbus_read_byte_data(save_client, 6)) - >= 0) - && ((sec == sec1) && (min == min1) && (hour == hour1) - && (day == day1) && (mon == mon1) - && (year == year1))) - - break; - - sec1 = sec; - min1 = min; - hour1 = hour; - day1 = day; - mon1 = mon; - year1 = year; - } while (--limit > 0); - up(&m41t00_mutex); - - if (limit == 0) { - dev_warn(&save_client->dev, - "m41t00: can't read rtc chip\n"); - sec = min = hour = day = mon = year = 0; - } - - sec &= 0x7f; - min &= 0x7f; - hour &= 0x3f; - day &= 0x3f; - mon &= 0x1f; - year &= 0xff; - - BCD_TO_BIN(sec); - BCD_TO_BIN(min); - BCD_TO_BIN(hour); - BCD_TO_BIN(day); - BCD_TO_BIN(mon); - BCD_TO_BIN(year); - - year += 1900; - if (year < 1970) - year += 100; - - return mktime(year, mon, day, hour, min, sec); -} - -static void -m41t00_set_tlet(ulong arg) -{ - struct rtc_time tm; - ulong nowtime = *(ulong *)arg; - - to_tm(nowtime, &tm); - tm.tm_year = (tm.tm_year - 1900) % 100; - - BIN_TO_BCD(tm.tm_sec); - BIN_TO_BCD(tm.tm_min); - BIN_TO_BCD(tm.tm_hour); - BIN_TO_BCD(tm.tm_mon); - BIN_TO_BCD(tm.tm_mday); - BIN_TO_BCD(tm.tm_year); - - down(&m41t00_mutex); - if ((i2c_smbus_write_byte_data(save_client, 0, tm.tm_sec & 0x7f) < 0) - || (i2c_smbus_write_byte_data(save_client, 1, tm.tm_min & 0x7f) - < 0) - || (i2c_smbus_write_byte_data(save_client, 2, tm.tm_hour & 0x7f) - < 0) - || (i2c_smbus_write_byte_data(save_client, 4, tm.tm_mday & 0x7f) - < 0) - || (i2c_smbus_write_byte_data(save_client, 5, tm.tm_mon & 0x7f) - < 0) - || (i2c_smbus_write_byte_data(save_client, 6, tm.tm_year & 0x7f) - < 0)) - - dev_warn(&save_client->dev,"m41t00: can't write to rtc chip\n"); - - up(&m41t00_mutex); - return; -} - -ulong new_time; - -DECLARE_TASKLET_DISABLED(m41t00_tasklet, m41t00_set_tlet, (ulong)&new_time); - -int -m41t00_set_rtc_time(ulong nowtime) -{ - new_time = nowtime; - - if (in_interrupt()) - tasklet_schedule(&m41t00_tasklet); - else - m41t00_set_tlet((ulong)&new_time); - - return 0; -} - -/* - ***************************************************************************** - * - * Driver Interface - * - ***************************************************************************** - */ -static int -m41t00_probe(struct i2c_adapter *adap, int addr, int kind) -{ - struct i2c_client *client; - int rc; - - client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); - if (!client) - return -ENOMEM; - - memset(client, 0, sizeof(struct i2c_client)); - strncpy(client->name, M41T00_DRV_NAME, I2C_NAME_SIZE); - client->flags = I2C_DF_NOTIFY; - client->addr = addr; - client->adapter = adap; - client->driver = &m41t00_driver; - - if ((rc = i2c_attach_client(client)) != 0) { - kfree(client); - return rc; - } - - save_client = client; - return 0; -} - -static int -m41t00_attach(struct i2c_adapter *adap) -{ - return i2c_probe(adap, &addr_data, m41t00_probe); -} - -static int -m41t00_detach(struct i2c_client *client) -{ - int rc; - - if ((rc = i2c_detach_client(client)) == 0) { - kfree(client); - tasklet_kill(&m41t00_tasklet); - } - return rc; -} - -static struct i2c_driver m41t00_driver = { - .owner = THIS_MODULE, - .name = M41T00_DRV_NAME, - .id = I2C_DRIVERID_STM41T00, - .flags = I2C_DF_NOTIFY, - .attach_adapter = m41t00_attach, - .detach_client = m41t00_detach, -}; - -static int __init -m41t00_init(void) -{ - return i2c_add_driver(&m41t00_driver); -} - -static void __exit -m41t00_exit(void) -{ - i2c_del_driver(&m41t00_driver); - return; -} - -module_init(m41t00_init); -module_exit(m41t00_exit); - -MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>"); -MODULE_DESCRIPTION("ST Microelectronics M41T00 RTC I2C Client Driver"); -MODULE_LICENSE("GPL"); |