summaryrefslogtreecommitdiffstats
path: root/drivers/mfd/qcom-spmi-pmic.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mfd/qcom-spmi-pmic.c')
-rw-r--r--drivers/mfd/qcom-spmi-pmic.c310
1 files changed, 310 insertions, 0 deletions
diff --git a/drivers/mfd/qcom-spmi-pmic.c b/drivers/mfd/qcom-spmi-pmic.c
new file mode 100644
index 0000000000..8e449cff5c
--- /dev/null
+++ b/drivers/mfd/qcom-spmi-pmic.c
@@ -0,0 +1,310 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/gfp.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/spmi.h>
+#include <linux/types.h>
+#include <linux/regmap.h>
+#include <linux/of_platform.h>
+#include <soc/qcom/qcom-spmi-pmic.h>
+
+#define PMIC_REV2 0x101
+#define PMIC_REV3 0x102
+#define PMIC_REV4 0x103
+#define PMIC_TYPE 0x104
+#define PMIC_SUBTYPE 0x105
+#define PMIC_FAB_ID 0x1f2
+
+#define PMIC_TYPE_VALUE 0x51
+
+#define PMIC_REV4_V2 0x02
+
+struct qcom_spmi_dev {
+ int num_usids;
+ struct qcom_spmi_pmic pmic;
+};
+
+static DEFINE_MUTEX(pmic_spmi_revid_lock);
+
+#define N_USIDS(n) ((void *)n)
+
+static const struct of_device_id pmic_spmi_id_table[] = {
+ { .compatible = "qcom,pm660", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm660l", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8004", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8005", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8019", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8028", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8110", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8150", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8150b", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8150c", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8150l", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8226", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8841", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8901", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8909", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8916", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8941", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8950", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8994", .data = N_USIDS(2) },
+ { .compatible = "qcom,pm8998", .data = N_USIDS(2) },
+ { .compatible = "qcom,pma8084", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmd9635", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmi8950", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmi8962", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmi8994", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmi8998", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmk8002", .data = N_USIDS(2) },
+ { .compatible = "qcom,pmp8074", .data = N_USIDS(2) },
+ { .compatible = "qcom,smb2351", .data = N_USIDS(2) },
+ { .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) },
+ { }
+};
+
+/*
+ * A PMIC can be represented by multiple SPMI devices, but
+ * only the base PMIC device will contain a reference to
+ * the revision information.
+ *
+ * This function takes a pointer to a pmic device and
+ * returns a pointer to the base PMIC device.
+ *
+ * This only supports PMICs with 1 or 2 USIDs.
+ */
+static struct spmi_device *qcom_pmic_get_base_usid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx)
+{
+ struct device_node *spmi_bus;
+ struct device_node *child;
+ int function_parent_usid, ret;
+ u32 pmic_addr;
+
+ /*
+ * Quick return if the function device is already in the base
+ * USID. This will always be hit for PMICs with only 1 USID.
+ */
+ if (sdev->usid % ctx->num_usids == 0) {
+ get_device(&sdev->dev);
+ return sdev;
+ }
+
+ function_parent_usid = sdev->usid;
+
+ /*
+ * Walk through the list of PMICs until we find the sibling USID.
+ * The goal is to find the first USID which is less than the
+ * number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs
+ * where the function device is under USID 3, we want to find the
+ * device for USID 2.
+ */
+ spmi_bus = of_get_parent(sdev->dev.of_node);
+ sdev = ERR_PTR(-ENODATA);
+ for_each_child_of_node(spmi_bus, child) {
+ ret = of_property_read_u32_index(child, "reg", 0, &pmic_addr);
+ if (ret) {
+ of_node_put(child);
+ sdev = ERR_PTR(ret);
+ break;
+ }
+
+ if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) {
+ sdev = spmi_device_from_of(child);
+ if (!sdev) {
+ /*
+ * If the base USID for this PMIC hasn't been
+ * registered yet then we need to defer.
+ */
+ sdev = ERR_PTR(-EPROBE_DEFER);
+ }
+ of_node_put(child);
+ break;
+ }
+ }
+
+ of_node_put(spmi_bus);
+
+ return sdev;
+}
+
+static int pmic_spmi_get_base_revid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx)
+{
+ struct qcom_spmi_dev *base_ctx;
+ struct spmi_device *base;
+ int ret = 0;
+
+ base = qcom_pmic_get_base_usid(sdev, ctx);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ /*
+ * Copy revid info from base device if it has probed and is still
+ * bound to its driver.
+ */
+ mutex_lock(&pmic_spmi_revid_lock);
+ base_ctx = spmi_device_get_drvdata(base);
+ if (!base_ctx) {
+ ret = -EPROBE_DEFER;
+ goto out_unlock;
+ }
+ memcpy(&ctx->pmic, &base_ctx->pmic, sizeof(ctx->pmic));
+out_unlock:
+ mutex_unlock(&pmic_spmi_revid_lock);
+
+ put_device(&base->dev);
+
+ return ret;
+}
+
+static int pmic_spmi_load_revid(struct regmap *map, struct device *dev,
+ struct qcom_spmi_pmic *pmic)
+{
+ int ret;
+
+ ret = regmap_read(map, PMIC_TYPE, &pmic->type);
+ if (ret < 0)
+ return ret;
+
+ if (pmic->type != PMIC_TYPE_VALUE)
+ return ret;
+
+ ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype);
+ if (ret < 0)
+ return ret;
+
+ pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible;
+
+ ret = regmap_read(map, PMIC_REV2, &pmic->rev2);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(map, PMIC_REV3, &pmic->minor);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(map, PMIC_REV4, &pmic->major);
+ if (ret < 0)
+ return ret;
+
+ if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) {
+ ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id);
+ if (ret < 0)
+ return ret;
+ }
+
+ /*
+ * In early versions of PM8941 and PM8226, the major revision number
+ * started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
+ * Increment the major revision number here if the chip is an early
+ * version of PM8941 or PM8226.
+ */
+ if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) &&
+ pmic->major < PMIC_REV4_V2)
+ pmic->major++;
+
+ if (pmic->subtype == PM8110_SUBTYPE)
+ pmic->minor = pmic->rev2;
+
+ dev_dbg(dev, "%x: %s v%d.%d\n",
+ pmic->subtype, pmic->name, pmic->major, pmic->minor);
+
+ return 0;
+}
+
+/**
+ * qcom_pmic_get() - Get a pointer to the base PMIC device
+ *
+ * This function takes a struct device for a driver which is a child of a PMIC.
+ * And locates the PMIC revision information for it.
+ *
+ * @dev: the pmic function device
+ * @return: the struct qcom_spmi_pmic* pointer associated with the function device
+ */
+const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev)
+{
+ struct spmi_device *sdev;
+ struct qcom_spmi_dev *spmi;
+
+ /*
+ * Make sure the device is actually a child of a PMIC
+ */
+ if (!of_match_device(pmic_spmi_id_table, dev->parent))
+ return ERR_PTR(-EINVAL);
+
+ sdev = to_spmi_device(dev->parent);
+ spmi = dev_get_drvdata(&sdev->dev);
+
+ return &spmi->pmic;
+}
+EXPORT_SYMBOL(qcom_pmic_get);
+
+static const struct regmap_config spmi_regmap_config = {
+ .reg_bits = 16,
+ .val_bits = 8,
+ .max_register = 0xffff,
+ .fast_io = true,
+};
+
+static int pmic_spmi_probe(struct spmi_device *sdev)
+{
+ struct regmap *regmap;
+ struct qcom_spmi_dev *ctx;
+ int ret;
+
+ regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->num_usids = (uintptr_t)of_device_get_match_data(&sdev->dev);
+
+ /* Only the first slave id for a PMIC contains this information */
+ if (sdev->usid % ctx->num_usids == 0) {
+ ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic);
+ if (ret < 0)
+ return ret;
+ } else {
+ ret = pmic_spmi_get_base_revid(sdev, ctx);
+ if (ret)
+ return ret;
+ }
+
+ mutex_lock(&pmic_spmi_revid_lock);
+ spmi_device_set_drvdata(sdev, ctx);
+ mutex_unlock(&pmic_spmi_revid_lock);
+
+ return devm_of_platform_populate(&sdev->dev);
+}
+
+static void pmic_spmi_remove(struct spmi_device *sdev)
+{
+ mutex_lock(&pmic_spmi_revid_lock);
+ spmi_device_set_drvdata(sdev, NULL);
+ mutex_unlock(&pmic_spmi_revid_lock);
+}
+
+MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
+
+static struct spmi_driver pmic_spmi_driver = {
+ .probe = pmic_spmi_probe,
+ .remove = pmic_spmi_remove,
+ .driver = {
+ .name = "pmic-spmi",
+ .of_match_table = pmic_spmi_id_table,
+ },
+};
+module_spmi_driver(pmic_spmi_driver);
+
+MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
+MODULE_ALIAS("spmi:spmi-pmic");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
+MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");