diff options
Diffstat (limited to 'drivers/thermal/qcom-spmi-temp-alarm.c')
| -rw-r--r-- | drivers/thermal/qcom-spmi-temp-alarm.c | 92 |
1 files changed, 71 insertions, 21 deletions
diff --git a/drivers/thermal/qcom-spmi-temp-alarm.c b/drivers/thermal/qcom-spmi-temp-alarm.c index 95f987d5aa71..ad4f3a8d6560 100644 --- a/drivers/thermal/qcom-spmi-temp-alarm.c +++ b/drivers/thermal/qcom-spmi-temp-alarm.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2011-2015, The Linux Foundation. All rights reserved. + * Copyright (c) 2011-2015, 2017, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -11,6 +11,7 @@ * GNU General Public License for more details. */ +#include <linux/bitops.h> #include <linux/delay.h> #include <linux/err.h> #include <linux/iio/consumer.h> @@ -29,13 +30,17 @@ #define QPNP_TM_REG_ALARM_CTRL 0x46 #define QPNP_TM_TYPE 0x09 -#define QPNP_TM_SUBTYPE 0x08 +#define QPNP_TM_SUBTYPE_GEN1 0x08 +#define QPNP_TM_SUBTYPE_GEN2 0x09 -#define STATUS_STAGE_MASK 0x03 +#define STATUS_GEN1_STAGE_MASK GENMASK(1, 0) +#define STATUS_GEN2_STATE_MASK GENMASK(6, 4) +#define STATUS_GEN2_STATE_SHIFT 4 -#define SHUTDOWN_CTRL1_THRESHOLD_MASK 0x03 +#define SHUTDOWN_CTRL1_OVERRIDE_MASK GENMASK(7, 6) +#define SHUTDOWN_CTRL1_THRESHOLD_MASK GENMASK(1, 0) -#define ALARM_CTRL_FORCE_ENABLE 0x80 +#define ALARM_CTRL_FORCE_ENABLE BIT(7) /* * Trip point values based on threshold control @@ -58,6 +63,7 @@ struct qpnp_tm_chip { struct regmap *map; struct thermal_zone_device *tz_dev; + unsigned int subtype; long temp; unsigned int thresh; unsigned int stage; @@ -66,6 +72,9 @@ struct qpnp_tm_chip { struct iio_channel *adc; }; +/* This array maps from GEN2 alarm state to GEN1 alarm stage */ +static const unsigned int alarm_state_map[8] = {0, 1, 1, 2, 2, 3, 3, 3}; + static int qpnp_tm_read(struct qpnp_tm_chip *chip, u16 addr, u8 *data) { unsigned int val; @@ -84,30 +93,59 @@ static int qpnp_tm_write(struct qpnp_tm_chip *chip, u16 addr, u8 data) return regmap_write(chip->map, chip->base + addr, data); } +/** + * qpnp_tm_get_temp_stage() - return over-temperature stage + * @chip: Pointer to the qpnp_tm chip + * + * Return: stage (GEN1) or state (GEN2) on success, or errno on failure. + */ +static int qpnp_tm_get_temp_stage(struct qpnp_tm_chip *chip) +{ + int ret; + u8 reg = 0; + + ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®); + if (ret < 0) + return ret; + + if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) + ret = reg & STATUS_GEN1_STAGE_MASK; + else + ret = (reg & STATUS_GEN2_STATE_MASK) >> STATUS_GEN2_STATE_SHIFT; + + return ret; +} + /* * This function updates the internal temp value based on the * current thermal stage and threshold as well as the previous stage */ static int qpnp_tm_update_temp_no_adc(struct qpnp_tm_chip *chip) { - unsigned int stage; + unsigned int stage, stage_new, stage_old; int ret; - u8 reg = 0; - ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®); + ret = qpnp_tm_get_temp_stage(chip); if (ret < 0) return ret; + stage = ret; - stage = reg & STATUS_STAGE_MASK; + if (chip->subtype == QPNP_TM_SUBTYPE_GEN1) { + stage_new = stage; + stage_old = chip->stage; + } else { + stage_new = alarm_state_map[stage]; + stage_old = alarm_state_map[chip->stage]; + } - if (stage > chip->stage) { + if (stage_new > stage_old) { /* increasing stage, use lower bound */ - chip->temp = (stage - 1) * TEMP_STAGE_STEP + + chip->temp = (stage_new - 1) * TEMP_STAGE_STEP + chip->thresh * TEMP_THRESH_STEP + TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN; - } else if (stage < chip->stage) { + } else if (stage_new < stage_old) { /* decreasing stage, use upper bound */ - chip->temp = stage * TEMP_STAGE_STEP + + chip->temp = stage_new * TEMP_STAGE_STEP + chip->thresh * TEMP_THRESH_STEP - TEMP_STAGE_HYSTERESIS + TEMP_THRESH_MIN; } @@ -162,28 +200,37 @@ static irqreturn_t qpnp_tm_isr(int irq, void *data) */ static int qpnp_tm_init(struct qpnp_tm_chip *chip) { + unsigned int stage; int ret; - u8 reg; + u8 reg = 0; - chip->thresh = THRESH_MIN; + ret = qpnp_tm_read(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, ®); + if (ret < 0) + return ret; + + chip->thresh = reg & SHUTDOWN_CTRL1_THRESHOLD_MASK; chip->temp = DEFAULT_TEMP; - ret = qpnp_tm_read(chip, QPNP_TM_REG_STATUS, ®); + ret = qpnp_tm_get_temp_stage(chip); if (ret < 0) return ret; + chip->stage = ret; - chip->stage = reg & STATUS_STAGE_MASK; + stage = chip->subtype == QPNP_TM_SUBTYPE_GEN1 + ? chip->stage : alarm_state_map[chip->stage]; - if (chip->stage) + if (stage) chip->temp = chip->thresh * TEMP_THRESH_STEP + - (chip->stage - 1) * TEMP_STAGE_STEP + + (stage - 1) * TEMP_STAGE_STEP + TEMP_THRESH_MIN; /* * Set threshold and disable software override of stage 2 and 3 * shutdowns. */ - reg = chip->thresh & SHUTDOWN_CTRL1_THRESHOLD_MASK; + chip->thresh = THRESH_MIN; + reg &= ~(SHUTDOWN_CTRL1_OVERRIDE_MASK | SHUTDOWN_CTRL1_THRESHOLD_MASK); + reg |= chip->thresh & SHUTDOWN_CTRL1_THRESHOLD_MASK; ret = qpnp_tm_write(chip, QPNP_TM_REG_SHUTDOWN_CTRL1, reg); if (ret < 0) return ret; @@ -246,12 +293,15 @@ static int qpnp_tm_probe(struct platform_device *pdev) return ret; } - if (type != QPNP_TM_TYPE || subtype != QPNP_TM_SUBTYPE) { + if (type != QPNP_TM_TYPE || (subtype != QPNP_TM_SUBTYPE_GEN1 + && subtype != QPNP_TM_SUBTYPE_GEN2)) { dev_err(&pdev->dev, "invalid type 0x%02x or subtype 0x%02x\n", type, subtype); return -ENODEV; } + chip->subtype = subtype; + ret = qpnp_tm_init(chip); if (ret < 0) { dev_err(&pdev->dev, "init failed\n"); |