diff options
Diffstat (limited to 'drivers/misc/tps6594-esm.c')
| -rw-r--r-- | drivers/misc/tps6594-esm.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/misc/tps6594-esm.c b/drivers/misc/tps6594-esm.c new file mode 100644 index 0000000000..b4d67a1a24 --- /dev/null +++ b/drivers/misc/tps6594-esm.c @@ -0,0 +1,146 @@ +// 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"); |