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d27bb69dc8
Receiving the Over-Current Protection interrupt while the regulator is
disabled does not count as unhandled/failure (IRQ_NONE, or 0 as it were)
but a "fake event", usually due to inrush as the is regulator about to
be enabled.
Fixes: 390af53e04
("regulator: qcom-labibb: Implement short-circuit and over-current IRQs")
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Link: https://lore.kernel.org/r/20211224113450.107958-1-marijn.suijten@somainline.org
Signed-off-by: Mark Brown <broonie@kernel.org>
906 lines
26 KiB
C
906 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2020, The Linux Foundation. All rights reserved.
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#include <linux/module.h>
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#include <linux/of_irq.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/driver.h>
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#include <linux/regulator/of_regulator.h>
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#define REG_PERPH_TYPE 0x04
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#define QCOM_LAB_TYPE 0x24
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#define QCOM_IBB_TYPE 0x20
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#define PMI8998_LAB_REG_BASE 0xde00
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#define PMI8998_IBB_REG_BASE 0xdc00
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#define PMI8998_IBB_LAB_REG_OFFSET 0x200
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#define REG_LABIBB_STATUS1 0x08
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#define LABIBB_STATUS1_SC_BIT BIT(6)
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#define LABIBB_STATUS1_VREG_OK_BIT BIT(7)
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#define REG_LABIBB_INT_SET_TYPE 0x11
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#define REG_LABIBB_INT_POLARITY_HIGH 0x12
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#define REG_LABIBB_INT_POLARITY_LOW 0x13
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#define REG_LABIBB_INT_LATCHED_CLR 0x14
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#define REG_LABIBB_INT_EN_SET 0x15
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#define REG_LABIBB_INT_EN_CLR 0x16
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#define LABIBB_INT_VREG_OK BIT(0)
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#define LABIBB_INT_VREG_TYPE_LEVEL 0
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#define REG_LABIBB_VOLTAGE 0x41
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#define LABIBB_VOLTAGE_OVERRIDE_EN BIT(7)
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#define LAB_VOLTAGE_SET_MASK GENMASK(3, 0)
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#define IBB_VOLTAGE_SET_MASK GENMASK(5, 0)
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#define REG_LABIBB_ENABLE_CTL 0x46
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#define LABIBB_CONTROL_ENABLE BIT(7)
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#define REG_LABIBB_PD_CTL 0x47
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#define LAB_PD_CTL_MASK GENMASK(1, 0)
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#define IBB_PD_CTL_MASK (BIT(0) | BIT(7))
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#define LAB_PD_CTL_STRONG_PULL BIT(0)
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#define IBB_PD_CTL_HALF_STRENGTH BIT(0)
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#define IBB_PD_CTL_EN BIT(7)
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#define REG_LABIBB_CURRENT_LIMIT 0x4b
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#define LAB_CURRENT_LIMIT_MASK GENMASK(2, 0)
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#define IBB_CURRENT_LIMIT_MASK GENMASK(4, 0)
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#define LAB_CURRENT_LIMIT_OVERRIDE_EN BIT(3)
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#define LABIBB_CURRENT_LIMIT_EN BIT(7)
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#define REG_IBB_PWRUP_PWRDN_CTL_1 0x58
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#define IBB_CTL_1_DISCHARGE_EN BIT(2)
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#define REG_LABIBB_SOFT_START_CTL 0x5f
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#define REG_LABIBB_SEC_ACCESS 0xd0
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#define LABIBB_SEC_UNLOCK_CODE 0xa5
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#define LAB_ENABLE_CTL_MASK BIT(7)
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#define IBB_ENABLE_CTL_MASK (BIT(7) | BIT(6))
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#define LABIBB_OFF_ON_DELAY 1000
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#define LAB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 2)
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#define IBB_ENABLE_TIME (LABIBB_OFF_ON_DELAY * 10)
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#define LABIBB_POLL_ENABLED_TIME 1000
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#define OCP_RECOVERY_INTERVAL_MS 500
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#define SC_RECOVERY_INTERVAL_MS 250
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#define LABIBB_MAX_OCP_COUNT 4
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#define LABIBB_MAX_SC_COUNT 3
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#define LABIBB_MAX_FATAL_COUNT 2
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struct labibb_current_limits {
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u32 uA_min;
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u32 uA_step;
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u8 ovr_val;
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};
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struct labibb_regulator {
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struct regulator_desc desc;
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struct device *dev;
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struct regmap *regmap;
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struct regulator_dev *rdev;
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struct labibb_current_limits uA_limits;
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struct delayed_work ocp_recovery_work;
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struct delayed_work sc_recovery_work;
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u16 base;
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u8 type;
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u8 dischg_sel;
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u8 soft_start_sel;
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int sc_irq;
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int sc_count;
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int ocp_irq;
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int ocp_irq_count;
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int fatal_count;
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};
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struct labibb_regulator_data {
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const char *name;
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u8 type;
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u16 base;
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const struct regulator_desc *desc;
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};
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static int qcom_labibb_ocp_hw_enable(struct regulator_dev *rdev)
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{
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struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
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int ret;
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/* Clear irq latch status to avoid spurious event */
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ret = regmap_update_bits(rdev->regmap,
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vreg->base + REG_LABIBB_INT_LATCHED_CLR,
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LABIBB_INT_VREG_OK, 1);
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if (ret)
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return ret;
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/* Enable OCP HW interrupt */
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return regmap_update_bits(rdev->regmap,
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vreg->base + REG_LABIBB_INT_EN_SET,
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LABIBB_INT_VREG_OK, 1);
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}
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static int qcom_labibb_ocp_hw_disable(struct regulator_dev *rdev)
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{
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struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
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return regmap_update_bits(rdev->regmap,
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vreg->base + REG_LABIBB_INT_EN_CLR,
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LABIBB_INT_VREG_OK, 1);
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}
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/**
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* qcom_labibb_check_ocp_status - Check the Over-Current Protection status
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* @vreg: Main driver structure
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*
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* This function checks the STATUS1 register for the VREG_OK bit: if it is
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* set, then there is no Over-Current event.
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*
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* Returns: Zero if there is no over-current, 1 if in over-current or
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* negative number for error
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*/
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static int qcom_labibb_check_ocp_status(struct labibb_regulator *vreg)
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{
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u32 cur_status;
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int ret;
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ret = regmap_read(vreg->rdev->regmap, vreg->base + REG_LABIBB_STATUS1,
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&cur_status);
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if (ret)
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return ret;
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return !(cur_status & LABIBB_STATUS1_VREG_OK_BIT);
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}
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/**
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* qcom_labibb_ocp_recovery_worker - Handle OCP event
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* @work: OCP work structure
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*
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* This is the worker function to handle the Over Current Protection
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* hardware event; This will check if the hardware is still
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* signaling an over-current condition and will eventually stop
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* the regulator if such condition is still signaled after
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* LABIBB_MAX_OCP_COUNT times.
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*
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* If the driver that is consuming the regulator did not take action
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* for the OCP condition, or the hardware did not stabilize, a cut
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* of the LAB and IBB regulators will be forced (regulators will be
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* disabled).
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*
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* As last, if the writes to shut down the LAB/IBB regulators fail
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* for more than LABIBB_MAX_FATAL_COUNT, then a kernel panic will be
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* triggered, as a last resort to protect the hardware from burning;
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* this, however, is expected to never happen, but this is kept to
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* try to further ensure that we protect the hardware at all costs.
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*/
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static void qcom_labibb_ocp_recovery_worker(struct work_struct *work)
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{
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struct labibb_regulator *vreg;
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const struct regulator_ops *ops;
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int ret;
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vreg = container_of(work, struct labibb_regulator,
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ocp_recovery_work.work);
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ops = vreg->rdev->desc->ops;
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if (vreg->ocp_irq_count >= LABIBB_MAX_OCP_COUNT) {
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/*
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* If we tried to disable the regulator multiple times but
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* we kept failing, there's only one last hope to save our
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* hardware from the death: raise a kernel bug, reboot and
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* hope that the bootloader kindly saves us. This, though
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* is done only as paranoid checking, because failing the
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* regmap write to disable the vreg is almost impossible,
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* since we got here after multiple regmap R/W.
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*/
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BUG_ON(vreg->fatal_count > LABIBB_MAX_FATAL_COUNT);
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dev_err(&vreg->rdev->dev, "LABIBB: CRITICAL: Disabling regulator\n");
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/* Disable the regulator immediately to avoid damage */
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ret = ops->disable(vreg->rdev);
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if (ret) {
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vreg->fatal_count++;
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goto reschedule;
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}
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enable_irq(vreg->ocp_irq);
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vreg->fatal_count = 0;
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return;
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}
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ret = qcom_labibb_check_ocp_status(vreg);
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if (ret != 0) {
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vreg->ocp_irq_count++;
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goto reschedule;
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}
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ret = qcom_labibb_ocp_hw_enable(vreg->rdev);
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if (ret) {
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/* We cannot trust it without OCP enabled. */
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dev_err(vreg->dev, "Cannot enable OCP IRQ\n");
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vreg->ocp_irq_count++;
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goto reschedule;
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}
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enable_irq(vreg->ocp_irq);
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/* Everything went fine: reset the OCP count! */
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vreg->ocp_irq_count = 0;
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return;
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reschedule:
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mod_delayed_work(system_wq, &vreg->ocp_recovery_work,
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msecs_to_jiffies(OCP_RECOVERY_INTERVAL_MS));
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}
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/**
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* qcom_labibb_ocp_isr - Interrupt routine for OverCurrent Protection
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* @irq: Interrupt number
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* @chip: Main driver structure
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*
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* Over Current Protection (OCP) will signal to the client driver
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* that an over-current event has happened and then will schedule
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* a recovery worker.
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*
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* Disabling and eventually re-enabling the regulator is expected
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* to be done by the driver, as some hardware may be triggering an
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* over-current condition only at first initialization or it may
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* be expected only for a very brief amount of time, after which
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* the attached hardware may be expected to stabilize its current
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* draw.
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*
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* Returns: IRQ_HANDLED for success or IRQ_NONE for failure.
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*/
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static irqreturn_t qcom_labibb_ocp_isr(int irq, void *chip)
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{
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struct labibb_regulator *vreg = chip;
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const struct regulator_ops *ops = vreg->rdev->desc->ops;
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int ret;
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/* If the regulator is not enabled, this is a fake event */
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if (!ops->is_enabled(vreg->rdev))
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return IRQ_HANDLED;
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/* If we tried to recover for too many times it's not getting better */
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if (vreg->ocp_irq_count > LABIBB_MAX_OCP_COUNT)
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return IRQ_NONE;
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/*
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* If we (unlikely) can't read this register, to prevent hardware
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* damage at all costs, we assume that the overcurrent event was
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* real; Moreover, if the status register is not signaling OCP,
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* it was a spurious event, so it's all ok.
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*/
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ret = qcom_labibb_check_ocp_status(vreg);
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if (ret == 0) {
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vreg->ocp_irq_count = 0;
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goto end;
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}
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vreg->ocp_irq_count++;
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/*
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* Disable the interrupt temporarily, or it will fire continuously;
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* we will re-enable it in the recovery worker function.
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*/
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disable_irq_nosync(irq);
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/* Warn the user for overcurrent */
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dev_warn(vreg->dev, "Over-Current interrupt fired!\n");
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/* Disable the interrupt to avoid hogging */
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ret = qcom_labibb_ocp_hw_disable(vreg->rdev);
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if (ret)
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goto end;
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/* Signal overcurrent event to drivers */
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regulator_notifier_call_chain(vreg->rdev,
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REGULATOR_EVENT_OVER_CURRENT, NULL);
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end:
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/* Schedule the recovery work */
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schedule_delayed_work(&vreg->ocp_recovery_work,
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msecs_to_jiffies(OCP_RECOVERY_INTERVAL_MS));
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if (ret)
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return IRQ_NONE;
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return IRQ_HANDLED;
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}
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static int qcom_labibb_set_ocp(struct regulator_dev *rdev, int lim,
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int severity, bool enable)
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{
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struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
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char *ocp_irq_name;
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u32 irq_flags = IRQF_ONESHOT;
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int irq_trig_low, ret;
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/*
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* labibb supports only protection - and does not support setting
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* limit. Furthermore, we don't support disabling protection.
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*/
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if (lim || severity != REGULATOR_SEVERITY_PROT || !enable)
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return -EINVAL;
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/* If there is no OCP interrupt, there's nothing to set */
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if (vreg->ocp_irq <= 0)
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return -EINVAL;
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ocp_irq_name = devm_kasprintf(vreg->dev, GFP_KERNEL, "%s-over-current",
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vreg->desc.name);
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if (!ocp_irq_name)
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return -ENOMEM;
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/* IRQ polarities - LAB: trigger-low, IBB: trigger-high */
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switch (vreg->type) {
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case QCOM_LAB_TYPE:
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irq_flags |= IRQF_TRIGGER_LOW;
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irq_trig_low = 1;
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break;
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case QCOM_IBB_TYPE:
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irq_flags |= IRQF_TRIGGER_HIGH;
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irq_trig_low = 0;
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break;
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default:
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return -EINVAL;
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}
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/* Activate OCP HW level interrupt */
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ret = regmap_update_bits(rdev->regmap,
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vreg->base + REG_LABIBB_INT_SET_TYPE,
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LABIBB_INT_VREG_OK,
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LABIBB_INT_VREG_TYPE_LEVEL);
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if (ret)
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return ret;
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/* Set OCP interrupt polarity */
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ret = regmap_update_bits(rdev->regmap,
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vreg->base + REG_LABIBB_INT_POLARITY_HIGH,
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LABIBB_INT_VREG_OK, !irq_trig_low);
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if (ret)
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return ret;
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ret = regmap_update_bits(rdev->regmap,
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vreg->base + REG_LABIBB_INT_POLARITY_LOW,
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LABIBB_INT_VREG_OK, irq_trig_low);
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if (ret)
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return ret;
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ret = qcom_labibb_ocp_hw_enable(rdev);
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if (ret)
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return ret;
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return devm_request_threaded_irq(vreg->dev, vreg->ocp_irq, NULL,
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qcom_labibb_ocp_isr, irq_flags,
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ocp_irq_name, vreg);
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}
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/**
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* qcom_labibb_check_sc_status - Check the Short Circuit Protection status
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* @vreg: Main driver structure
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*
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* This function checks the STATUS1 register on both LAB and IBB regulators
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* for the ShortCircuit bit: if it is set on *any* of them, then we have
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* experienced a short-circuit event.
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*
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* Returns: Zero if there is no short-circuit, 1 if in short-circuit or
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* negative number for error
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*/
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static int qcom_labibb_check_sc_status(struct labibb_regulator *vreg)
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{
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u32 ibb_status, ibb_reg, lab_status, lab_reg;
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int ret;
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/* We have to work on both regulators due to PBS... */
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lab_reg = ibb_reg = vreg->base + REG_LABIBB_STATUS1;
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if (vreg->type == QCOM_LAB_TYPE)
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ibb_reg -= PMI8998_IBB_LAB_REG_OFFSET;
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else
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lab_reg += PMI8998_IBB_LAB_REG_OFFSET;
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ret = regmap_read(vreg->rdev->regmap, lab_reg, &lab_status);
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if (ret)
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return ret;
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ret = regmap_read(vreg->rdev->regmap, ibb_reg, &ibb_status);
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if (ret)
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return ret;
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return !!(lab_status & LABIBB_STATUS1_SC_BIT) ||
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!!(ibb_status & LABIBB_STATUS1_SC_BIT);
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}
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/**
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* qcom_labibb_sc_recovery_worker - Handle Short Circuit event
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* @work: SC work structure
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*
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* This is the worker function to handle the Short Circuit Protection
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* hardware event; This will check if the hardware is still
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* signaling a short-circuit condition and will eventually never
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* re-enable the regulator if such condition is still signaled after
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* LABIBB_MAX_SC_COUNT times.
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*
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* If the driver that is consuming the regulator did not take action
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* for the SC condition, or the hardware did not stabilize, this
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* worker will stop rescheduling, leaving the regulators disabled
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* as already done by the Portable Batch System (PBS).
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*
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* Returns: IRQ_HANDLED for success or IRQ_NONE for failure.
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*/
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static void qcom_labibb_sc_recovery_worker(struct work_struct *work)
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{
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struct labibb_regulator *vreg;
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const struct regulator_ops *ops;
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u32 lab_reg, ibb_reg, lab_val, ibb_val, val;
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bool pbs_cut = false;
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int i, sc, ret;
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vreg = container_of(work, struct labibb_regulator,
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sc_recovery_work.work);
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ops = vreg->rdev->desc->ops;
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/*
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* If we tried to check the regulator status multiple times but we
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* kept failing, then just bail out, as the Portable Batch System
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* (PBS) will disable the vregs for us, preventing hardware damage.
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*/
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if (vreg->fatal_count > LABIBB_MAX_FATAL_COUNT)
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return;
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/* Too many short-circuit events. Throw in the towel. */
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if (vreg->sc_count > LABIBB_MAX_SC_COUNT)
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return;
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/*
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* The Portable Batch System (PBS) automatically disables LAB
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* and IBB when a short-circuit event is detected, so we have to
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* check and work on both of them at the same time.
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*/
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lab_reg = ibb_reg = vreg->base + REG_LABIBB_ENABLE_CTL;
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if (vreg->type == QCOM_LAB_TYPE)
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ibb_reg -= PMI8998_IBB_LAB_REG_OFFSET;
|
|
else
|
|
lab_reg += PMI8998_IBB_LAB_REG_OFFSET;
|
|
|
|
sc = qcom_labibb_check_sc_status(vreg);
|
|
if (sc)
|
|
goto reschedule;
|
|
|
|
for (i = 0; i < LABIBB_MAX_SC_COUNT; i++) {
|
|
ret = regmap_read(vreg->regmap, lab_reg, &lab_val);
|
|
if (ret) {
|
|
vreg->fatal_count++;
|
|
goto reschedule;
|
|
}
|
|
|
|
ret = regmap_read(vreg->regmap, ibb_reg, &ibb_val);
|
|
if (ret) {
|
|
vreg->fatal_count++;
|
|
goto reschedule;
|
|
}
|
|
val = lab_val & ibb_val;
|
|
|
|
if (!(val & LABIBB_CONTROL_ENABLE)) {
|
|
pbs_cut = true;
|
|
break;
|
|
}
|
|
usleep_range(5000, 6000);
|
|
}
|
|
if (pbs_cut)
|
|
goto reschedule;
|
|
|
|
|
|
/*
|
|
* If we have reached this point, we either have successfully
|
|
* recovered from the SC condition or we had a spurious SC IRQ,
|
|
* which means that we can re-enable the regulators, if they
|
|
* have ever been disabled by the PBS.
|
|
*/
|
|
ret = ops->enable(vreg->rdev);
|
|
if (ret)
|
|
goto reschedule;
|
|
|
|
/* Everything went fine: reset the OCP count! */
|
|
vreg->sc_count = 0;
|
|
enable_irq(vreg->sc_irq);
|
|
return;
|
|
|
|
reschedule:
|
|
/*
|
|
* Now that we have done basic handling of the short-circuit,
|
|
* reschedule this worker in the regular system workqueue, as
|
|
* taking action is not truly urgent anymore.
|
|
*/
|
|
vreg->sc_count++;
|
|
mod_delayed_work(system_wq, &vreg->sc_recovery_work,
|
|
msecs_to_jiffies(SC_RECOVERY_INTERVAL_MS));
|
|
}
|
|
|
|
/**
|
|
* qcom_labibb_sc_isr - Interrupt routine for Short Circuit Protection
|
|
* @irq: Interrupt number
|
|
* @chip: Main driver structure
|
|
*
|
|
* Short Circuit Protection (SCP) will signal to the client driver
|
|
* that a regulation-out event has happened and then will schedule
|
|
* a recovery worker.
|
|
*
|
|
* The LAB and IBB regulators will be automatically disabled by the
|
|
* Portable Batch System (PBS) and they will be enabled again by
|
|
* the worker function if the hardware stops signaling the short
|
|
* circuit event.
|
|
*
|
|
* Returns: IRQ_HANDLED for success or IRQ_NONE for failure.
|
|
*/
|
|
static irqreturn_t qcom_labibb_sc_isr(int irq, void *chip)
|
|
{
|
|
struct labibb_regulator *vreg = chip;
|
|
|
|
if (vreg->sc_count > LABIBB_MAX_SC_COUNT)
|
|
return IRQ_NONE;
|
|
|
|
/* Warn the user for short circuit */
|
|
dev_warn(vreg->dev, "Short-Circuit interrupt fired!\n");
|
|
|
|
/*
|
|
* Disable the interrupt temporarily, or it will fire continuously;
|
|
* we will re-enable it in the recovery worker function.
|
|
*/
|
|
disable_irq_nosync(irq);
|
|
|
|
/* Signal out of regulation event to drivers */
|
|
regulator_notifier_call_chain(vreg->rdev,
|
|
REGULATOR_EVENT_REGULATION_OUT, NULL);
|
|
|
|
/* Schedule the short-circuit handling as high-priority work */
|
|
mod_delayed_work(system_highpri_wq, &vreg->sc_recovery_work,
|
|
msecs_to_jiffies(SC_RECOVERY_INTERVAL_MS));
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
|
|
static int qcom_labibb_set_current_limit(struct regulator_dev *rdev,
|
|
int min_uA, int max_uA)
|
|
{
|
|
struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
|
|
struct regulator_desc *desc = &vreg->desc;
|
|
struct labibb_current_limits *lim = &vreg->uA_limits;
|
|
u32 mask, val;
|
|
int i, ret, sel = -1;
|
|
|
|
if (min_uA < lim->uA_min || max_uA < lim->uA_min)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < desc->n_current_limits; i++) {
|
|
int uA_limit = (lim->uA_step * i) + lim->uA_min;
|
|
|
|
if (max_uA >= uA_limit && min_uA <= uA_limit)
|
|
sel = i;
|
|
}
|
|
if (sel < 0)
|
|
return -EINVAL;
|
|
|
|
/* Current limit setting needs secure access */
|
|
ret = regmap_write(vreg->regmap, vreg->base + REG_LABIBB_SEC_ACCESS,
|
|
LABIBB_SEC_UNLOCK_CODE);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mask = desc->csel_mask | lim->ovr_val;
|
|
mask |= LABIBB_CURRENT_LIMIT_EN;
|
|
val = (u32)sel | lim->ovr_val;
|
|
val |= LABIBB_CURRENT_LIMIT_EN;
|
|
|
|
return regmap_update_bits(vreg->regmap, desc->csel_reg, mask, val);
|
|
}
|
|
|
|
static int qcom_labibb_get_current_limit(struct regulator_dev *rdev)
|
|
{
|
|
struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
|
|
struct regulator_desc *desc = &vreg->desc;
|
|
struct labibb_current_limits *lim = &vreg->uA_limits;
|
|
unsigned int cur_step;
|
|
int ret;
|
|
|
|
ret = regmap_read(vreg->regmap, desc->csel_reg, &cur_step);
|
|
if (ret)
|
|
return ret;
|
|
cur_step &= desc->csel_mask;
|
|
|
|
return (cur_step * lim->uA_step) + lim->uA_min;
|
|
}
|
|
|
|
static int qcom_labibb_set_soft_start(struct regulator_dev *rdev)
|
|
{
|
|
struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
|
|
u32 val = 0;
|
|
|
|
if (vreg->type == QCOM_IBB_TYPE)
|
|
val = vreg->dischg_sel;
|
|
else
|
|
val = vreg->soft_start_sel;
|
|
|
|
return regmap_write(rdev->regmap, rdev->desc->soft_start_reg, val);
|
|
}
|
|
|
|
static int qcom_labibb_get_table_sel(const int *table, int sz, u32 value)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < sz; i++)
|
|
if (table[i] == value)
|
|
return i;
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* IBB discharge resistor values in KOhms */
|
|
static const int dischg_resistor_values[] = { 300, 64, 32, 16 };
|
|
|
|
/* Soft start time in microseconds */
|
|
static const int soft_start_values[] = { 200, 400, 600, 800 };
|
|
|
|
static int qcom_labibb_of_parse_cb(struct device_node *np,
|
|
const struct regulator_desc *desc,
|
|
struct regulator_config *config)
|
|
{
|
|
struct labibb_regulator *vreg = config->driver_data;
|
|
u32 dischg_kohms, soft_start_time;
|
|
int ret;
|
|
|
|
ret = of_property_read_u32(np, "qcom,discharge-resistor-kohms",
|
|
&dischg_kohms);
|
|
if (ret)
|
|
dischg_kohms = 300;
|
|
|
|
ret = qcom_labibb_get_table_sel(dischg_resistor_values,
|
|
ARRAY_SIZE(dischg_resistor_values),
|
|
dischg_kohms);
|
|
if (ret < 0)
|
|
return ret;
|
|
vreg->dischg_sel = (u8)ret;
|
|
|
|
ret = of_property_read_u32(np, "qcom,soft-start-us",
|
|
&soft_start_time);
|
|
if (ret)
|
|
soft_start_time = 200;
|
|
|
|
ret = qcom_labibb_get_table_sel(soft_start_values,
|
|
ARRAY_SIZE(soft_start_values),
|
|
soft_start_time);
|
|
if (ret < 0)
|
|
return ret;
|
|
vreg->soft_start_sel = (u8)ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct regulator_ops qcom_labibb_ops = {
|
|
.enable = regulator_enable_regmap,
|
|
.disable = regulator_disable_regmap,
|
|
.is_enabled = regulator_is_enabled_regmap,
|
|
.set_voltage_sel = regulator_set_voltage_sel_regmap,
|
|
.get_voltage_sel = regulator_get_voltage_sel_regmap,
|
|
.list_voltage = regulator_list_voltage_linear,
|
|
.map_voltage = regulator_map_voltage_linear,
|
|
.set_active_discharge = regulator_set_active_discharge_regmap,
|
|
.set_pull_down = regulator_set_pull_down_regmap,
|
|
.set_current_limit = qcom_labibb_set_current_limit,
|
|
.get_current_limit = qcom_labibb_get_current_limit,
|
|
.set_soft_start = qcom_labibb_set_soft_start,
|
|
.set_over_current_protection = qcom_labibb_set_ocp,
|
|
};
|
|
|
|
static const struct regulator_desc pmi8998_lab_desc = {
|
|
.enable_mask = LAB_ENABLE_CTL_MASK,
|
|
.enable_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_ENABLE_CTL),
|
|
.enable_val = LABIBB_CONTROL_ENABLE,
|
|
.enable_time = LAB_ENABLE_TIME,
|
|
.poll_enabled_time = LABIBB_POLL_ENABLED_TIME,
|
|
.soft_start_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_SOFT_START_CTL),
|
|
.pull_down_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_PD_CTL),
|
|
.pull_down_mask = LAB_PD_CTL_MASK,
|
|
.pull_down_val_on = LAB_PD_CTL_STRONG_PULL,
|
|
.vsel_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE),
|
|
.vsel_mask = LAB_VOLTAGE_SET_MASK,
|
|
.apply_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE),
|
|
.apply_bit = LABIBB_VOLTAGE_OVERRIDE_EN,
|
|
.csel_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_CURRENT_LIMIT),
|
|
.csel_mask = LAB_CURRENT_LIMIT_MASK,
|
|
.n_current_limits = 8,
|
|
.off_on_delay = LABIBB_OFF_ON_DELAY,
|
|
.owner = THIS_MODULE,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.min_uV = 4600000,
|
|
.uV_step = 100000,
|
|
.n_voltages = 16,
|
|
.ops = &qcom_labibb_ops,
|
|
.of_parse_cb = qcom_labibb_of_parse_cb,
|
|
};
|
|
|
|
static const struct regulator_desc pmi8998_ibb_desc = {
|
|
.enable_mask = IBB_ENABLE_CTL_MASK,
|
|
.enable_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_ENABLE_CTL),
|
|
.enable_val = LABIBB_CONTROL_ENABLE,
|
|
.enable_time = IBB_ENABLE_TIME,
|
|
.poll_enabled_time = LABIBB_POLL_ENABLED_TIME,
|
|
.soft_start_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_SOFT_START_CTL),
|
|
.active_discharge_off = 0,
|
|
.active_discharge_on = IBB_CTL_1_DISCHARGE_EN,
|
|
.active_discharge_mask = IBB_CTL_1_DISCHARGE_EN,
|
|
.active_discharge_reg = (PMI8998_IBB_REG_BASE + REG_IBB_PWRUP_PWRDN_CTL_1),
|
|
.pull_down_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_PD_CTL),
|
|
.pull_down_mask = IBB_PD_CTL_MASK,
|
|
.pull_down_val_on = IBB_PD_CTL_HALF_STRENGTH | IBB_PD_CTL_EN,
|
|
.vsel_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE),
|
|
.vsel_mask = IBB_VOLTAGE_SET_MASK,
|
|
.apply_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE),
|
|
.apply_bit = LABIBB_VOLTAGE_OVERRIDE_EN,
|
|
.csel_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_CURRENT_LIMIT),
|
|
.csel_mask = IBB_CURRENT_LIMIT_MASK,
|
|
.n_current_limits = 32,
|
|
.off_on_delay = LABIBB_OFF_ON_DELAY,
|
|
.owner = THIS_MODULE,
|
|
.type = REGULATOR_VOLTAGE,
|
|
.min_uV = 1400000,
|
|
.uV_step = 100000,
|
|
.n_voltages = 64,
|
|
.ops = &qcom_labibb_ops,
|
|
.of_parse_cb = qcom_labibb_of_parse_cb,
|
|
};
|
|
|
|
static const struct labibb_regulator_data pmi8998_labibb_data[] = {
|
|
{"lab", QCOM_LAB_TYPE, PMI8998_LAB_REG_BASE, &pmi8998_lab_desc},
|
|
{"ibb", QCOM_IBB_TYPE, PMI8998_IBB_REG_BASE, &pmi8998_ibb_desc},
|
|
{ },
|
|
};
|
|
|
|
static const struct of_device_id qcom_labibb_match[] = {
|
|
{ .compatible = "qcom,pmi8998-lab-ibb", .data = &pmi8998_labibb_data},
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, qcom_labibb_match);
|
|
|
|
static int qcom_labibb_regulator_probe(struct platform_device *pdev)
|
|
{
|
|
struct labibb_regulator *vreg;
|
|
struct device *dev = &pdev->dev;
|
|
struct regulator_config cfg = {};
|
|
struct device_node *reg_node;
|
|
const struct of_device_id *match;
|
|
const struct labibb_regulator_data *reg_data;
|
|
struct regmap *reg_regmap;
|
|
unsigned int type;
|
|
int ret;
|
|
|
|
reg_regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
|
if (!reg_regmap) {
|
|
dev_err(&pdev->dev, "Couldn't get parent's regmap\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
match = of_match_device(qcom_labibb_match, &pdev->dev);
|
|
if (!match)
|
|
return -ENODEV;
|
|
|
|
for (reg_data = match->data; reg_data->name; reg_data++) {
|
|
char *sc_irq_name;
|
|
int irq = 0;
|
|
|
|
/* Validate if the type of regulator is indeed
|
|
* what's mentioned in DT.
|
|
*/
|
|
ret = regmap_read(reg_regmap, reg_data->base + REG_PERPH_TYPE,
|
|
&type);
|
|
if (ret < 0) {
|
|
dev_err(dev,
|
|
"Peripheral type read failed ret=%d\n",
|
|
ret);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (WARN_ON((type != QCOM_LAB_TYPE) && (type != QCOM_IBB_TYPE)) ||
|
|
WARN_ON(type != reg_data->type))
|
|
return -EINVAL;
|
|
|
|
vreg = devm_kzalloc(&pdev->dev, sizeof(*vreg),
|
|
GFP_KERNEL);
|
|
if (!vreg)
|
|
return -ENOMEM;
|
|
|
|
sc_irq_name = devm_kasprintf(dev, GFP_KERNEL,
|
|
"%s-short-circuit",
|
|
reg_data->name);
|
|
if (!sc_irq_name)
|
|
return -ENOMEM;
|
|
|
|
reg_node = of_get_child_by_name(pdev->dev.of_node,
|
|
reg_data->name);
|
|
if (!reg_node)
|
|
return -EINVAL;
|
|
|
|
/* The Short Circuit interrupt is critical */
|
|
irq = of_irq_get_byname(reg_node, "sc-err");
|
|
if (irq <= 0) {
|
|
if (irq == 0)
|
|
irq = -EINVAL;
|
|
|
|
return dev_err_probe(vreg->dev, irq,
|
|
"Short-circuit irq not found.\n");
|
|
}
|
|
vreg->sc_irq = irq;
|
|
|
|
/* OverCurrent Protection IRQ is optional */
|
|
irq = of_irq_get_byname(reg_node, "ocp");
|
|
vreg->ocp_irq = irq;
|
|
vreg->ocp_irq_count = 0;
|
|
of_node_put(reg_node);
|
|
|
|
vreg->regmap = reg_regmap;
|
|
vreg->dev = dev;
|
|
vreg->base = reg_data->base;
|
|
vreg->type = reg_data->type;
|
|
INIT_DELAYED_WORK(&vreg->sc_recovery_work,
|
|
qcom_labibb_sc_recovery_worker);
|
|
|
|
if (vreg->ocp_irq > 0)
|
|
INIT_DELAYED_WORK(&vreg->ocp_recovery_work,
|
|
qcom_labibb_ocp_recovery_worker);
|
|
|
|
switch (vreg->type) {
|
|
case QCOM_LAB_TYPE:
|
|
/* LAB Limits: 200-1600mA */
|
|
vreg->uA_limits.uA_min = 200000;
|
|
vreg->uA_limits.uA_step = 200000;
|
|
vreg->uA_limits.ovr_val = LAB_CURRENT_LIMIT_OVERRIDE_EN;
|
|
break;
|
|
case QCOM_IBB_TYPE:
|
|
/* IBB Limits: 0-1550mA */
|
|
vreg->uA_limits.uA_min = 0;
|
|
vreg->uA_limits.uA_step = 50000;
|
|
vreg->uA_limits.ovr_val = 0; /* No override bit */
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
memcpy(&vreg->desc, reg_data->desc, sizeof(vreg->desc));
|
|
vreg->desc.of_match = reg_data->name;
|
|
vreg->desc.name = reg_data->name;
|
|
|
|
cfg.dev = vreg->dev;
|
|
cfg.driver_data = vreg;
|
|
cfg.regmap = vreg->regmap;
|
|
|
|
vreg->rdev = devm_regulator_register(vreg->dev, &vreg->desc,
|
|
&cfg);
|
|
|
|
if (IS_ERR(vreg->rdev)) {
|
|
dev_err(dev, "qcom_labibb: error registering %s : %d\n",
|
|
reg_data->name, ret);
|
|
return PTR_ERR(vreg->rdev);
|
|
}
|
|
|
|
ret = devm_request_threaded_irq(vreg->dev, vreg->sc_irq, NULL,
|
|
qcom_labibb_sc_isr,
|
|
IRQF_ONESHOT |
|
|
IRQF_TRIGGER_RISING,
|
|
sc_irq_name, vreg);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver qcom_labibb_regulator_driver = {
|
|
.driver = {
|
|
.name = "qcom-lab-ibb-regulator",
|
|
.of_match_table = qcom_labibb_match,
|
|
},
|
|
.probe = qcom_labibb_regulator_probe,
|
|
};
|
|
module_platform_driver(qcom_labibb_regulator_driver);
|
|
|
|
MODULE_DESCRIPTION("Qualcomm labibb driver");
|
|
MODULE_AUTHOR("Nisha Kumari <nishakumari@codeaurora.org>");
|
|
MODULE_AUTHOR("Sumit Semwal <sumit.semwal@linaro.org>");
|
|
MODULE_LICENSE("GPL v2");
|