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Diffstat (limited to 'drivers/misc/tps6594-esm.c')
-rw-r--r--drivers/misc/tps6594-esm.c146
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");