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145 lines
3.6 KiB
145 lines
3.6 KiB
// 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/of_device.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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