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// SPDX-License-Identifier: GPL-2.0
/*
* ESM (Error Signal Monitor) driver for TI TPS6594/TPS6593/LP8764 PMICs
*
* Copyright (C) 2023 BayLibre Incorporated - https://www.baylibre.com/
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/mfd/tps6594.h>
#define TPS6594_DEV_REV_1 0x08
static irqreturn_t tps6594_esm_isr(int irq, void *dev_id)
{
struct platform_device *pdev = dev_id;
int i;
for (i = 0 ; i < pdev->num_resources ; i++) {
if (irq == platform_get_irq_byname(pdev, pdev->resource[i].name)) {
dev_err(pdev->dev.parent, "%s error detected\n", pdev->resource[i].name);
return IRQ_HANDLED;
}
}
return IRQ_NONE;
}
static int tps6594_esm_probe(struct platform_device *pdev)
{
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
unsigned int rev;
int irq;
int ret;
int i;
/*
* Due to a bug in revision 1 of the PMIC, the GPIO3 used for the
* SoC ESM function is used to power the load switch instead.
* As a consequence, ESM can not be used on those PMIC.
* Check the version and return an error in case of revision 1.
*/
ret = regmap_read(tps->regmap, TPS6594_REG_DEV_REV, &rev);
if (ret)
return dev_err_probe(dev, ret,
"Failed to read PMIC revision\n");
if (rev == TPS6594_DEV_REV_1)
return dev_err_probe(dev, -ENODEV,
"ESM not supported for revision 1 PMIC\n");
for (i = 0; i < pdev->num_resources; i++) {
irq = platform_get_irq_byname(pdev, pdev->resource[i].name);
if (irq < 0)
return irq;
ret = devm_request_threaded_irq(dev, irq, NULL,
tps6594_esm_isr, IRQF_ONESHOT,
pdev->resource[i].name, pdev);
if (ret)
return dev_err_probe(dev, ret, "Failed to request irq\n");
}
ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG,
TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV);
if (ret)
return dev_err_probe(dev, ret, "Failed to configure ESM\n");
ret = regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
if (ret)
return dev_err_probe(dev, ret, "Failed to start ESM\n");
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
return 0;
}
static void tps6594_esm_remove(struct platform_device *pdev)
{
struct tps6594 *tps = dev_get_drvdata(pdev->dev.parent);
struct device *dev = &pdev->dev;
int ret;
ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
if (ret) {
dev_err(dev, "Failed to stop ESM\n");
goto out;
}
ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_MODE_CFG,
TPS6594_BIT_ESM_SOC_EN | TPS6594_BIT_ESM_SOC_ENDRV);
if (ret)
dev_err(dev, "Failed to unconfigure ESM\n");
out:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
}
static int tps6594_esm_suspend(struct device *dev)
{
struct tps6594 *tps = dev_get_drvdata(dev->parent);
int ret;
ret = regmap_clear_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
pm_runtime_put_sync(dev);
return ret;
}
static int tps6594_esm_resume(struct device *dev)
{
struct tps6594 *tps = dev_get_drvdata(dev->parent);
pm_runtime_get_sync(dev);
return regmap_set_bits(tps->regmap, TPS6594_REG_ESM_SOC_START_REG,
TPS6594_BIT_ESM_SOC_START);
}
static DEFINE_SIMPLE_DEV_PM_OPS(tps6594_esm_pm_ops, tps6594_esm_suspend, tps6594_esm_resume);
static struct platform_driver tps6594_esm_driver = {
.driver = {
.name = "tps6594-esm",
.pm = pm_sleep_ptr(&tps6594_esm_pm_ops),
},
.probe = tps6594_esm_probe,
.remove = tps6594_esm_remove,
};
module_platform_driver(tps6594_esm_driver);
MODULE_ALIAS("platform:tps6594-esm");
MODULE_AUTHOR("Julien Panis <jpanis@baylibre.com>");
MODULE_DESCRIPTION("TPS6594 Error Signal Monitor Driver");
MODULE_LICENSE("GPL");
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