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d9c58aeb40
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Acked-by: Andrew Donnellan <ajd@linux.ibm.com> # cxl Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230718143102.1065481-1-robh@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
144 lines
3.6 KiB
C
144 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
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* Copyright (c) 2015, Sony Mobile Communications Inc.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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#include <linux/platform_device.h>
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struct qcom_coincell {
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struct device *dev;
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struct regmap *regmap;
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u32 base_addr;
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};
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#define QCOM_COINCELL_REG_RSET 0x44
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#define QCOM_COINCELL_REG_VSET 0x45
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#define QCOM_COINCELL_REG_ENABLE 0x46
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#define QCOM_COINCELL_ENABLE BIT(7)
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static const int qcom_rset_map[] = { 2100, 1700, 1200, 800 };
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static const int qcom_vset_map[] = { 2500, 3200, 3100, 3000 };
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/* NOTE: for pm8921 and others, voltage of 2500 is 16 (10000b), not 0 */
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/* if enable==0, rset and vset are ignored */
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static int qcom_coincell_chgr_config(struct qcom_coincell *chgr, int rset,
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int vset, bool enable)
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{
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int i, j, rc;
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/* if disabling, just do that and skip other operations */
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if (!enable)
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return regmap_write(chgr->regmap,
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chgr->base_addr + QCOM_COINCELL_REG_ENABLE, 0);
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/* find index for current-limiting resistor */
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for (i = 0; i < ARRAY_SIZE(qcom_rset_map); i++)
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if (rset == qcom_rset_map[i])
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break;
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if (i >= ARRAY_SIZE(qcom_rset_map)) {
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dev_err(chgr->dev, "invalid rset-ohms value %d\n", rset);
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return -EINVAL;
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}
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/* find index for charge voltage */
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for (j = 0; j < ARRAY_SIZE(qcom_vset_map); j++)
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if (vset == qcom_vset_map[j])
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break;
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if (j >= ARRAY_SIZE(qcom_vset_map)) {
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dev_err(chgr->dev, "invalid vset-millivolts value %d\n", vset);
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return -EINVAL;
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}
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rc = regmap_write(chgr->regmap,
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chgr->base_addr + QCOM_COINCELL_REG_RSET, i);
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if (rc) {
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/*
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* This is mainly to flag a bad base_addr (reg) from dts.
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* Other failures writing to the registers should be
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* extremely rare, or indicative of problems that
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* should be reported elsewhere (eg. spmi failure).
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*/
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dev_err(chgr->dev, "could not write to RSET register\n");
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return rc;
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}
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rc = regmap_write(chgr->regmap,
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chgr->base_addr + QCOM_COINCELL_REG_VSET, j);
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if (rc)
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return rc;
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/* set 'enable' register */
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return regmap_write(chgr->regmap,
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chgr->base_addr + QCOM_COINCELL_REG_ENABLE,
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QCOM_COINCELL_ENABLE);
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}
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static int qcom_coincell_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct qcom_coincell chgr;
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u32 rset = 0;
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u32 vset = 0;
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bool enable;
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int rc;
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chgr.dev = &pdev->dev;
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chgr.regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!chgr.regmap) {
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dev_err(chgr.dev, "Unable to get regmap\n");
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return -EINVAL;
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}
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rc = of_property_read_u32(node, "reg", &chgr.base_addr);
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if (rc)
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return rc;
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enable = !of_property_read_bool(node, "qcom,charger-disable");
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if (enable) {
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rc = of_property_read_u32(node, "qcom,rset-ohms", &rset);
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if (rc) {
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dev_err(chgr.dev,
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"can't find 'qcom,rset-ohms' in DT block");
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return rc;
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}
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rc = of_property_read_u32(node, "qcom,vset-millivolts", &vset);
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if (rc) {
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dev_err(chgr.dev,
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"can't find 'qcom,vset-millivolts' in DT block");
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return rc;
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}
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}
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return qcom_coincell_chgr_config(&chgr, rset, vset, enable);
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}
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static const struct of_device_id qcom_coincell_match_table[] = {
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{ .compatible = "qcom,pm8941-coincell", },
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{}
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};
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MODULE_DEVICE_TABLE(of, qcom_coincell_match_table);
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static struct platform_driver qcom_coincell_driver = {
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.driver = {
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.name = "qcom-spmi-coincell",
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.of_match_table = qcom_coincell_match_table,
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},
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.probe = qcom_coincell_probe,
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};
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module_platform_driver(qcom_coincell_driver);
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MODULE_DESCRIPTION("Qualcomm PMIC coincell charger driver");
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MODULE_LICENSE("GPL v2");
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