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1// SPDX-License-Identifier: GPL-2.02/*3 * ESM (Error Signal Monitor) driver for TI TPS6594/TPS6593/LP8764 PMICs4 *5 * Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/6 */7 8#include <linux/interrupt.h>9#include <linux/module.h>10#include <linux/platform_device.h>11#include <linux/pm_runtime.h>12#include <linux/regmap.h>13 14#include <linux/mfd/tps6594.h>15 16#define TPS6594_DEV_REV_1 0x0817 18static irqreturn_t tps6594_esm_isr(int irq, void *dev_id)19{20 struct platform_device *pdev = dev_id;21 int i;22 23 for (i = 0 ; i < pdev->num_resources ; i++) {24 if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) {25 dev_err(pdev->dev.parent, "%s error detected\n", pdev->resource[i].name);26 return IRQ_HANDLED;27 }28 }29 30 return IRQ_NONE;31}32 33static int tps6594_esm_probe(struct platform_device *pdev)34{35 struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);36 struct device *dev = &pdev->dev;37 unsigned int rev;38 int irq;39 int ret;40 int i;41 42 /*43 * Due to a bug in revision 1 of the PMIC, the GPIO3 used for the44 * SoC ESM function is used to power the load switch instead.45 * As a consequence, ESM can not be used on those PMIC.46 * Check the version and return an error in case of revision 1.47 */48 ret = regmap_read(tps->regmap, TPS6594_REG_DEV_REV, &rev);49 if (ret)50 return dev_err_probe(dev, ret,51 "Failed to read PMIC revision\n");52 if (rev == TPS6594_DEV_REV_1)53 return dev_err_probe(dev, -ENODEV,54 "ESM not supported for revision 1 PMIC\n");55 56 for (i = 0; i < pdev->num_resources; i++) {57 irq = platform_get_irq_byname(pdev, pdev->resource[i].name);58 if (irq < 0)59 return irq;60 61 ret = devm_request_threaded_irq(dev, irq, NULL,62 tps6594_esm_isr, IRQF_ONESHOT,63 pdev->resource[i].name, pdev);64 if (ret)65 return dev_err_probe(dev, ret, "Failed to request irq\n");66 }67 68 ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG,69 TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV);70 if (ret)71 return dev_err_probe(dev, ret, "Failed to configure ESM\n");72 73 ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,74 TPS6594_BIT_ESM_SOC_START);75 if (ret)76 return dev_err_probe(dev, ret, "Failed to start ESM\n");77 78 pm_runtime_enable(dev);79 pm_runtime_get_sync(dev);80 81 return 0;82}83 84static void tps6594_esm_remove(struct platform_device *pdev)85{86 struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);87 struct device *dev = &pdev->dev;88 int ret;89 90 ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,91 TPS6594_BIT_ESM_SOC_START);92 if (ret) {93 dev_err(dev, "Failed to stop ESM\n");94 goto out;95 }96 97 ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG,98 TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV);99 if (ret)100 dev_err(dev, "Failed to unconfigure ESM\n");101 102out:103 pm_runtime_put_sync(dev);104 pm_runtime_disable(dev);105}106 107static int tps6594_esm_suspend(struct device *dev)108{109 struct tps6594 *tps = dev_get_drvdata(dev->parent);110 int ret;111 112 ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,113 TPS6594_BIT_ESM_SOC_START);114 115 pm_runtime_put_sync(dev);116 117 return ret;118}119 120static int tps6594_esm_resume(struct device *dev)121{122 struct tps6594 *tps = dev_get_drvdata(dev->parent);123 124 pm_runtime_get_sync(dev);125 126 return regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,127 TPS6594_BIT_ESM_SOC_START);128}129 130static DEFINE_SIMPLE_DEV_PM_OPS(tps6594_esm_pm_ops, tps6594_esm_suspend, tps6594_esm_resume);131 132static struct platform_driver tps6594_esm_driver = {133 .driver = {134 .name = "tps6594-esm",135 .pm = pm_sleep_ptr(&tps6594_esm_pm_ops),136 },137 .probe = tps6594_esm_probe,138 .remove_new = tps6594_esm_remove,139};140 141module_platform_driver(tps6594_esm_driver);142 143MODULE_ALIAS("platform:tps6594-esm");144MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");145MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver");146MODULE_LICENSE("GPL");147