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rtc: ds1307: add trickle charger support

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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>
tirimbino
Wolfram Sang 13 years ago committed by Linus Torvalds
parent f8ae97019f
commit eb86c3064b
2 changed files with 38 additions and 3 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 19
      drivers/rtc/rtc-ds1307.c
  2. 22
      include/linux/rtc/ds1307.h

19
drivers/rtc/rtc-ds1307.c
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@ -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
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@ -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 */
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