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max17042: Add support for signalling change in SOC

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If platform has the alert pin attached to an interrupt source have the
driver signal a change in the SOC every 1 percent.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
This commit is contained in:
Ramakrishna Pallala 2012-01-24 09:26:06 -08:00 committed by Anton Vorontsov
parent f3a71a6eb1
commit e5f3872d20
1 changed files with 53 additions and 0 deletions
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53
drivers/power/max17042_battery.c
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@ -27,6 +27,7 @@
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mod_devicetable.h>
#include <linux/power_supply.h>
#include <linux/power/max17042_battery.h>
@ -43,6 +44,11 @@
#define STATUS_SMX_BIT (1 << 14)
#define STATUS_BR_BIT (1 << 15)
/* Interrupt mask bits */
#define CONFIG_ALRT_BIT_ENBL (1 << 2)
#define STATUS_INTR_SOC_BIT (1 << 14)
#define STATUS_INTR_LOW_SOC_BIT (1 << 10)
#define VFSOC0_LOCK 0x0000
#define VFSOC0_UNLOCK 0x0080
#define MODEL_UNLOCK1 0X0059
@ -552,6 +558,39 @@ static int max17042_init_chip(struct max17042_chip *chip)
return 0;
}
static void max17042_set_soc_threshold(struct max17042_chip *chip, u16 off)
{
u16 soc, soc_tr;
/* program interrupt thesholds such that we should
* get interrupt for every 'off' perc change in the soc
*/
soc = max17042_read_reg(chip->client, MAX17042_RepSOC) >> 8;
soc_tr = (soc + off) << 8;
soc_tr |= (soc - off);
max17042_write_reg(chip->client, MAX17042_SALRT_Th, soc_tr);
}
static irqreturn_t max17042_intr_handler(int id, void *dev)
{
return IRQ_WAKE_THREAD;
}
static irqreturn_t max17042_thread_handler(int id, void *dev)
{
struct max17042_chip *chip = dev;
u16 val;
val = max17042_read_reg(chip->client, MAX17042_STATUS);
if ((val & STATUS_INTR_SOC_BIT) ||
(val & STATUS_INTR_LOW_SOC_BIT)) {
dev_info(&chip->client->dev, "SOC threshold INTR\n");
max17042_set_soc_threshold(chip, 1);
}
power_supply_changed(&chip->battery);
return IRQ_HANDLED;
}
static void max17042_init_worker(struct work_struct *work)
{
@ -613,6 +652,20 @@ static int __devinit max17042_probe(struct i2c_client *client,
max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
}
if (client->irq) {
ret = request_threaded_irq(client->irq, max17042_intr_handler,
max17042_thread_handler,
0, chip->battery.name, chip);
if (!ret) {
reg = max17042_read_reg(client, MAX17042_CONFIG);
reg |= CONFIG_ALRT_BIT_ENBL;
max17042_write_reg(client, MAX17042_CONFIG, reg);
max17042_set_soc_threshold(chip, 1);
} else
dev_err(&client->dev, "%s(): cannot get IRQ\n",
__func__);
}
reg = max17042_read_reg(chip->client, MAX17042_STATUS);
if (reg & STATUS_POR_BIT) {