rtc: ds1307: add trickle charger support
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>
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@ -17,8 +17,7 @@
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#include <linux/string.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#include <linux/rtc/ds1307.h>
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/*
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* We can't determine type by probing, but if we expect pre-Linux code
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@ -92,7 +91,8 @@ enum ds_type {
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# define DS1337_BIT_A2I 0x02
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# define DS1337_BIT_A1I 0x01
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#define DS1339_REG_ALARM1_SECS 0x07
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#define DS1339_REG_TRICKLE 0x10
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#define DS13XX_TRICKLE_CHARGER_MAGIC 0xa0
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#define RX8025_REG_CTRL1 0x0e
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# define RX8025_BIT_2412 0x20
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@ -124,6 +124,7 @@ struct chip_desc {
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unsigned alarm:1;
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u16 nvram_offset;
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u16 nvram_size;
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u16 trickle_charger_reg;
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};
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static const struct chip_desc chips[last_ds_type] = {
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@ -140,6 +141,13 @@ static const struct chip_desc chips[last_ds_type] = {
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},
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[ds_1339] = {
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.alarm = 1,
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.trickle_charger_reg = 0x10,
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},
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[ds_1340] = {
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.trickle_charger_reg = 0x08,
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},
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[ds_1388] = {
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.trickle_charger_reg = 0x0a,
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},
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[ds_3231] = {
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.alarm = 1,
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@ -619,6 +627,7 @@ static int __devinit ds1307_probe(struct i2c_client *client,
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struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
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int want_irq = false;
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unsigned char *buf;
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struct ds1307_platform_data *pdata = client->dev.platform_data;
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static const int bbsqi_bitpos[] = {
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[ds_1337] = 0,
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[ds_1339] = DS1339_BIT_BBSQI,
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@ -638,6 +647,10 @@ static int __devinit ds1307_probe(struct i2c_client *client,
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ds1307->client = client;
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ds1307->type = id->driver_data;
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if (pdata && pdata->trickle_charger_setup && chip->trickle_charger_reg)
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i2c_smbus_write_byte_data(client, chip->trickle_charger_reg,
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DS13XX_TRICKLE_CHARGER_MAGIC | pdata->trickle_charger_setup);
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buf = ds1307->regs;
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if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
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ds1307->read_block_data = i2c_smbus_read_i2c_block_data;
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22
include/linux/rtc/ds1307.h
Normal file
22
include/linux/rtc/ds1307.h
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@ -0,0 +1,22 @@
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/*
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* ds1307.h - platform_data for the ds1307 (and variants) rtc driver
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* (C) Copyright 2012 by Wolfram Sang, Pengutronix e.K.
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* same license as the driver
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*/
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#ifndef _LINUX_DS1307_H
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#define _LINUX_DS1307_H
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#include <linux/types.h>
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#define DS1307_TRICKLE_CHARGER_250_OHM 0x01
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#define DS1307_TRICKLE_CHARGER_2K_OHM 0x02
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#define DS1307_TRICKLE_CHARGER_4K_OHM 0x03
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#define DS1307_TRICKLE_CHARGER_NO_DIODE 0x04
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#define DS1307_TRICKLE_CHARGER_DIODE 0x08
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struct ds1307_platform_data {
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u8 trickle_charger_setup;
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};
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#endif /* _LINUX_DS1307_H */
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