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015d188002
Avoids the need for manual cleanup of_node_put() in early exits from the loop. Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com> Link: https://lore.kernel.org/r/20240826092734.2899562-3-ruanjinjie@huawei.com Signed-off-by: Lee Jones <lee@kernel.org>
310 lines
8.3 KiB
C
310 lines
8.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*/
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/spmi.h>
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#include <linux/types.h>
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#include <linux/regmap.h>
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#include <soc/qcom/qcom-spmi-pmic.h>
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#define PMIC_REV2 0x101
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#define PMIC_REV3 0x102
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#define PMIC_REV4 0x103
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#define PMIC_TYPE 0x104
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#define PMIC_SUBTYPE 0x105
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#define PMIC_FAB_ID 0x1f2
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#define PMIC_TYPE_VALUE 0x51
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#define PMIC_REV4_V2 0x02
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struct qcom_spmi_dev {
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int num_usids;
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struct qcom_spmi_pmic pmic;
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};
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static DEFINE_MUTEX(pmic_spmi_revid_lock);
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#define N_USIDS(n) ((void *)n)
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static const struct of_device_id pmic_spmi_id_table[] = {
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{ .compatible = "qcom,pm660", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm660l", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8004", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8005", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8019", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8028", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8110", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150b", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150c", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8150l", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8226", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8841", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8901", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8909", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8916", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8937", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8941", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8950", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8994", .data = N_USIDS(2) },
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{ .compatible = "qcom,pm8998", .data = N_USIDS(2) },
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{ .compatible = "qcom,pma8084", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmd9635", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8950", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8962", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8994", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmi8998", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmk8002", .data = N_USIDS(2) },
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{ .compatible = "qcom,pmp8074", .data = N_USIDS(2) },
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{ .compatible = "qcom,smb2351", .data = N_USIDS(2) },
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{ .compatible = "qcom,spmi-pmic", .data = N_USIDS(1) },
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{ }
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};
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/*
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* A PMIC can be represented by multiple SPMI devices, but
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* only the base PMIC device will contain a reference to
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* the revision information.
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*
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* This function takes a pointer to a pmic device and
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* returns a pointer to the base PMIC device.
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*
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* This only supports PMICs with 1 or 2 USIDs.
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*/
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static struct spmi_device *qcom_pmic_get_base_usid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx)
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{
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struct device_node *spmi_bus;
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int function_parent_usid, ret;
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u32 pmic_addr;
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/*
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* Quick return if the function device is already in the base
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* USID. This will always be hit for PMICs with only 1 USID.
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*/
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if (sdev->usid % ctx->num_usids == 0) {
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get_device(&sdev->dev);
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return sdev;
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}
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function_parent_usid = sdev->usid;
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/*
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* Walk through the list of PMICs until we find the sibling USID.
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* The goal is to find the first USID which is less than the
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* number of USIDs in the PMIC array, e.g. for a PMIC with 2 USIDs
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* where the function device is under USID 3, we want to find the
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* device for USID 2.
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*/
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spmi_bus = of_get_parent(sdev->dev.of_node);
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sdev = ERR_PTR(-ENODATA);
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for_each_child_of_node_scoped(spmi_bus, child) {
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ret = of_property_read_u32_index(child, "reg", 0, &pmic_addr);
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if (ret) {
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sdev = ERR_PTR(ret);
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break;
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}
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if (pmic_addr == function_parent_usid - (ctx->num_usids - 1)) {
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sdev = spmi_find_device_by_of_node(child);
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if (!sdev) {
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/*
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* If the base USID for this PMIC hasn't been
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* registered yet then we need to defer.
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*/
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sdev = ERR_PTR(-EPROBE_DEFER);
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}
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break;
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}
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}
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of_node_put(spmi_bus);
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return sdev;
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}
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static int pmic_spmi_get_base_revid(struct spmi_device *sdev, struct qcom_spmi_dev *ctx)
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{
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struct qcom_spmi_dev *base_ctx;
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struct spmi_device *base;
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int ret = 0;
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base = qcom_pmic_get_base_usid(sdev, ctx);
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if (IS_ERR(base))
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return PTR_ERR(base);
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/*
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* Copy revid info from base device if it has probed and is still
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* bound to its driver.
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*/
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mutex_lock(&pmic_spmi_revid_lock);
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base_ctx = spmi_device_get_drvdata(base);
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if (!base_ctx) {
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ret = -EPROBE_DEFER;
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goto out_unlock;
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}
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memcpy(&ctx->pmic, &base_ctx->pmic, sizeof(ctx->pmic));
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out_unlock:
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mutex_unlock(&pmic_spmi_revid_lock);
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put_device(&base->dev);
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return ret;
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}
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static int pmic_spmi_load_revid(struct regmap *map, struct device *dev,
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struct qcom_spmi_pmic *pmic)
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{
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int ret;
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ret = regmap_read(map, PMIC_TYPE, &pmic->type);
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if (ret < 0)
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return ret;
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if (pmic->type != PMIC_TYPE_VALUE)
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return ret;
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ret = regmap_read(map, PMIC_SUBTYPE, &pmic->subtype);
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if (ret < 0)
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return ret;
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pmic->name = of_match_device(pmic_spmi_id_table, dev)->compatible;
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ret = regmap_read(map, PMIC_REV2, &pmic->rev2);
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if (ret < 0)
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return ret;
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ret = regmap_read(map, PMIC_REV3, &pmic->minor);
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if (ret < 0)
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return ret;
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ret = regmap_read(map, PMIC_REV4, &pmic->major);
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if (ret < 0)
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return ret;
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if (pmic->subtype == PMI8998_SUBTYPE || pmic->subtype == PM660_SUBTYPE) {
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ret = regmap_read(map, PMIC_FAB_ID, &pmic->fab_id);
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if (ret < 0)
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return ret;
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}
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/*
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* In early versions of PM8941 and PM8226, the major revision number
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* started incrementing from 0 (eg 0 = v1.0, 1 = v2.0).
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* Increment the major revision number here if the chip is an early
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* version of PM8941 or PM8226.
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*/
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if ((pmic->subtype == PM8941_SUBTYPE || pmic->subtype == PM8226_SUBTYPE) &&
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pmic->major < PMIC_REV4_V2)
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pmic->major++;
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if (pmic->subtype == PM8110_SUBTYPE)
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pmic->minor = pmic->rev2;
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dev_dbg(dev, "%x: %s v%d.%d\n",
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pmic->subtype, pmic->name, pmic->major, pmic->minor);
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return 0;
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}
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/**
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* qcom_pmic_get() - Get a pointer to the base PMIC device
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*
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* This function takes a struct device for a driver which is a child of a PMIC.
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* And locates the PMIC revision information for it.
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*
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* @dev: the pmic function device
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* @return: the struct qcom_spmi_pmic* pointer associated with the function device
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*/
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const struct qcom_spmi_pmic *qcom_pmic_get(struct device *dev)
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{
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struct spmi_device *sdev;
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struct qcom_spmi_dev *spmi;
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/*
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* Make sure the device is actually a child of a PMIC
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*/
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if (!of_match_device(pmic_spmi_id_table, dev->parent))
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return ERR_PTR(-EINVAL);
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sdev = to_spmi_device(dev->parent);
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spmi = dev_get_drvdata(&sdev->dev);
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return &spmi->pmic;
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}
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EXPORT_SYMBOL_GPL(qcom_pmic_get);
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static const struct regmap_config spmi_regmap_config = {
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.reg_bits = 16,
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.val_bits = 8,
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.max_register = 0xffff,
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.fast_io = true,
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};
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static int pmic_spmi_probe(struct spmi_device *sdev)
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{
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struct regmap *regmap;
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struct qcom_spmi_dev *ctx;
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int ret;
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regmap = devm_regmap_init_spmi_ext(sdev, &spmi_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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ctx = devm_kzalloc(&sdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->num_usids = (uintptr_t)device_get_match_data(&sdev->dev);
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/* Only the first slave id for a PMIC contains this information */
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if (sdev->usid % ctx->num_usids == 0) {
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ret = pmic_spmi_load_revid(regmap, &sdev->dev, &ctx->pmic);
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if (ret < 0)
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return ret;
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} else {
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ret = pmic_spmi_get_base_revid(sdev, ctx);
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if (ret)
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return ret;
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}
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mutex_lock(&pmic_spmi_revid_lock);
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spmi_device_set_drvdata(sdev, ctx);
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mutex_unlock(&pmic_spmi_revid_lock);
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return devm_of_platform_populate(&sdev->dev);
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}
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static void pmic_spmi_remove(struct spmi_device *sdev)
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{
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mutex_lock(&pmic_spmi_revid_lock);
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spmi_device_set_drvdata(sdev, NULL);
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mutex_unlock(&pmic_spmi_revid_lock);
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}
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MODULE_DEVICE_TABLE(of, pmic_spmi_id_table);
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static struct spmi_driver pmic_spmi_driver = {
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.probe = pmic_spmi_probe,
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.remove = pmic_spmi_remove,
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.driver = {
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.name = "pmic-spmi",
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.of_match_table = pmic_spmi_id_table,
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},
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};
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module_spmi_driver(pmic_spmi_driver);
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MODULE_DESCRIPTION("Qualcomm SPMI PMIC driver");
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MODULE_ALIAS("spmi:spmi-pmic");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Josh Cartwright <joshc@codeaurora.org>");
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MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>");
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