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Commit e5f3872d authored by Ramakrishna Pallala's avatar Ramakrishna Pallala Committed by Anton Vorontsov
Browse files

max17042: Add support for signalling change in SOC 



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: default avatarRamakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: default avatarDirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: default avatarAnton Vorontsov <anton.vorontsov@linaro.org>
parent f3a71a6e

drivers/power/max17042_battery.c

+53 −0
Original line number Diff line number Diff line
@@ -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) {