luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rtc: ds1307: add trickle charger support

Browse Source 
Some DS13XX devices have "trickle chargers".  Its configuration register
is at different locations, the setup is the same, though.  Since the
configuration is board specific, introduce a platform_data to this driver.
Tested with a DS1339 on a custom board.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Alessandro Zummo <alessandro.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wolfram Sang 2012-05-29 15:07:38 -07:00 committed by Linus Torvalds
parent f8ae97019f
commit eb86c3064b
2 changed files with 38 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/rtc/rtc-ds1307.c
View File

@ -17,8 +17,7 @@
#include <linux/string.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/rtc/ds1307.h>
/*
* We can't determine type by probing, but if we expect pre-Linux code
@ -92,7 +91,8 @@ enum ds_type {
# define DS1337_BIT_A2I 0x02
# define DS1337_BIT_A1I 0x01
#define DS1339_REG_ALARM1_SECS 0x07
#define DS1339_REG_TRICKLE 0x10
#define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0
#define RX8025_REG_CTRL1 0x0e
# define RX8025_BIT_2412 0x20
@ -124,6 +124,7 @@ struct chip_desc {
unsigned alarm:1;
u16 nvram_offset;
u16 nvram_size;
u16 trickle_charger_reg;
};
static const struct chip_desc chips[last_ds_type] = {
@ -140,6 +141,13 @@ static const struct chip_desc chips[last_ds_type] = {
},
[ds_1339] = {
.alarm = 1,
.trickle_charger_reg = 0x10,
},
[ds_1340] = {
.trickle_charger_reg = 0x08,
},
[ds_1388] = {
.trickle_charger_reg = 0x0a,
},
[ds_3231] = {
.alarm = 1,
@ -619,6 +627,7 @@ static int __devinit ds1307_probe(struct i2c_client *client,
struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
int want_irq = false;
unsigned char *buf;
struct ds1307_platform_data *pdata = client->dev.platform_data;
static const int bbsqi_bitpos[] = {
[ds_1337] = 0,
[ds_1339] = DS1339_BIT_BBSQI,
@ -638,6 +647,10 @@ static int __devinit ds1307_probe(struct i2c_client *client,
ds1307->client = client;
ds1307->type = id->driver_data;
if (pdata && pdata->trickle_charger_setup && chip->trickle_charger_reg)
i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
DS13XX_TRICKLE_CHARGER_MAGIC | pdata->trickle_charger_setup);
buf = ds1307->regs;
if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
ds1307->read_block_data = i2c_smbus_read_i2c_block_data;

22
include/linux/rtc/ds1307.h Normal file
View File

@ -0,0 +1,22 @@
/*
* ds1307.h - platform_data for the ds1307 (and variants) rtc driver
* (C) Copyright 2012 by Wolfram Sang, Pengutronix e.K.
* same license as the driver
*/
#ifndef _LINUX_DS1307_H
#define _LINUX_DS1307_H
#include <linux/types.h>
#define DS1307_TRICKLE_CHARGER_250_OHM 0x01
#define DS1307_TRICKLE_CHARGER_2K_OHM 0x02
#define DS1307_TRICKLE_CHARGER_4K_OHM 0x03
#define DS1307_TRICKLE_CHARGER_NO_DIODE 0x04
#define DS1307_TRICKLE_CHARGER_DIODE 0x08
struct ds1307_platform_data {
u8 trickle_charger_setup;
};
#endif /* _LINUX_DS1307_H */