mirror of
https://github.com/torvalds/linux.git
synced 2024-12-24 11:51:27 +00:00
e75850b457
We need the char/misc fixes in here as well to build on top of. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
147 lines
3.8 KiB
C
147 lines
3.8 KiB
C
// 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_new = 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");
|