diff options
| author | Ramakrishna Pallala <ramakrishna.pallala@intel.com> | 2012-01-24 09:26:06 -0800 |
|---|---|---|
| committer | Anton Vorontsov <anton.vorontsov@linaro.org> | 2012-03-26 20:38:41 +0400 |
| commit | e5f3872d20448706d3bb8083ee82a9226d3f8b5c (patch) | |
| tree | e6631f09e2465a3770e5c6d2a9eeeb3c33b3b6f0 /drivers | |
| parent | f3a71a6eb13b71cc8a3dc5b6e5692e3db66b92f0 (diff) | |
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: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/power/max17042_battery.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c index fde7ccd62953..3a30a27b094c 100644 --- a/drivers/power/max17042_battery.c +++ b/drivers/power/max17042_battery.c @@ -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) { |