154 lines
4 KiB
C
154 lines
4 KiB
C
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.
|
|
* Copyright (c) 2015, Sony Mobile Communications Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 and
|
|
* only version 2 as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/of.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
struct qcom_coincell {
|
|
struct device *dev;
|
|
struct regmap *regmap;
|
|
u32 base_addr;
|
|
};
|
|
|
|
#define QCOM_COINCELL_REG_RSET 0x44
|
|
#define QCOM_COINCELL_REG_VSET 0x45
|
|
#define QCOM_COINCELL_REG_ENABLE 0x46
|
|
|
|
#define QCOM_COINCELL_ENABLE BIT(7)
|
|
|
|
static const int qcom_rset_map[] = { 2100, 1700, 1200, 800 };
|
|
static const int qcom_vset_map[] = { 2500, 3200, 3100, 3000 };
|
|
/* NOTE: for pm8921 and others, voltage of 2500 is 16 (10000b), not 0 */
|
|
|
|
/* if enable==0, rset and vset are ignored */
|
|
static int qcom_coincell_chgr_config(struct qcom_coincell *chgr, int rset,
|
|
int vset, bool enable)
|
|
{
|
|
int i, j, rc;
|
|
|
|
/* if disabling, just do that and skip other operations */
|
|
if (!enable)
|
|
return regmap_write(chgr->regmap,
|
|
chgr->base_addr + QCOM_COINCELL_REG_ENABLE, 0);
|
|
|
|
/* find index for current-limiting resistor */
|
|
for (i = 0; i < ARRAY_SIZE(qcom_rset_map); i++)
|
|
if (rset == qcom_rset_map[i])
|
|
break;
|
|
|
|
if (i >= ARRAY_SIZE(qcom_rset_map)) {
|
|
dev_err(chgr->dev, "invalid rset-ohms value %d\n", rset);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* find index for charge voltage */
|
|
for (j = 0; j < ARRAY_SIZE(qcom_vset_map); j++)
|
|
if (vset == qcom_vset_map[j])
|
|
break;
|
|
|
|
if (j >= ARRAY_SIZE(qcom_vset_map)) {
|
|
dev_err(chgr->dev, "invalid vset-millivolts value %d\n", vset);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = regmap_write(chgr->regmap,
|
|
chgr->base_addr + QCOM_COINCELL_REG_RSET, i);
|
|
if (rc) {
|
|
/*
|
|
* This is mainly to flag a bad base_addr (reg) from dts.
|
|
* Other failures writing to the registers should be
|
|
* extremely rare, or indicative of problems that
|
|
* should be reported elsewhere (eg. spmi failure).
|
|
*/
|
|
dev_err(chgr->dev, "could not write to RSET register\n");
|
|
return rc;
|
|
}
|
|
|
|
rc = regmap_write(chgr->regmap,
|
|
chgr->base_addr + QCOM_COINCELL_REG_VSET, j);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* set 'enable' register */
|
|
return regmap_write(chgr->regmap,
|
|
chgr->base_addr + QCOM_COINCELL_REG_ENABLE,
|
|
QCOM_COINCELL_ENABLE);
|
|
}
|
|
|
|
static int qcom_coincell_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *node = pdev->dev.of_node;
|
|
struct qcom_coincell chgr;
|
|
u32 rset = 0;
|
|
u32 vset = 0;
|
|
bool enable;
|
|
int rc;
|
|
|
|
chgr.dev = &pdev->dev;
|
|
|
|
chgr.regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
|
if (!chgr.regmap) {
|
|
dev_err(chgr.dev, "Unable to get regmap\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = of_property_read_u32(node, "reg", &chgr.base_addr);
|
|
if (rc)
|
|
return rc;
|
|
|
|
enable = !of_property_read_bool(node, "qcom,charger-disable");
|
|
|
|
if (enable) {
|
|
rc = of_property_read_u32(node, "qcom,rset-ohms", &rset);
|
|
if (rc) {
|
|
dev_err(chgr.dev,
|
|
"can't find 'qcom,rset-ohms' in DT block");
|
|
return rc;
|
|
}
|
|
|
|
rc = of_property_read_u32(node, "qcom,vset-millivolts", &vset);
|
|
if (rc) {
|
|
dev_err(chgr.dev,
|
|
"can't find 'qcom,vset-millivolts' in DT block");
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return qcom_coincell_chgr_config(&chgr, rset, vset, enable);
|
|
}
|
|
|
|
static const struct of_device_id qcom_coincell_match_table[] = {
|
|
{ .compatible = "qcom,pm8941-coincell", },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(of, qcom_coincell_match_table);
|
|
|
|
static struct platform_driver qcom_coincell_driver = {
|
|
.driver = {
|
|
.name = "qcom-spmi-coincell",
|
|
.of_match_table = qcom_coincell_match_table,
|
|
},
|
|
.probe = qcom_coincell_probe,
|
|
};
|
|
|
|
module_platform_driver(qcom_coincell_driver);
|
|
|
|
MODULE_DESCRIPTION("Qualcomm PMIC coincell charger driver");
|
|
MODULE_LICENSE("GPL v2");
|