541 lines
12 KiB
C
541 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Spreadtrum Communications Inc.
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/usb/phy.h>
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#include <linux/regmap.h>
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#include <linux/notifier.h>
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#include <linux/of.h>
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/* PMIC global registers definition */
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#define SC2731_CHARGE_STATUS 0xedc
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#define SC2731_CHARGE_FULL BIT(4)
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#define SC2731_MODULE_EN1 0xc0c
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#define SC2731_CHARGE_EN BIT(5)
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/* SC2731 switch charger registers definition */
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#define SC2731_CHG_CFG0 0x0
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#define SC2731_CHG_CFG1 0x4
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#define SC2731_CHG_CFG2 0x8
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#define SC2731_CHG_CFG3 0xc
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#define SC2731_CHG_CFG4 0x10
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#define SC2731_CHG_CFG5 0x28
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/* SC2731_CHG_CFG0 register definition */
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#define SC2731_PRECHG_RNG_SHIFT 11
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#define SC2731_PRECHG_RNG_MASK GENMASK(12, 11)
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#define SC2731_TERMINATION_VOL_MASK GENMASK(2, 1)
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#define SC2731_TERMINATION_VOL_SHIFT 1
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#define SC2731_TERMINATION_VOL_CAL_MASK GENMASK(8, 3)
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#define SC2731_TERMINATION_VOL_CAL_SHIFT 3
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#define SC2731_TERMINATION_CUR_MASK GENMASK(2, 0)
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#define SC2731_CC_EN BIT(13)
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#define SC2731_CHARGER_PD BIT(0)
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/* SC2731_CHG_CFG1 register definition */
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#define SC2731_CUR_MASK GENMASK(5, 0)
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/* SC2731_CHG_CFG5 register definition */
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#define SC2731_CUR_LIMIT_SHIFT 8
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#define SC2731_CUR_LIMIT_MASK GENMASK(9, 8)
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/* Default current definition (unit is mA) */
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#define SC2731_CURRENT_LIMIT_100 100
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#define SC2731_CURRENT_LIMIT_500 500
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#define SC2731_CURRENT_LIMIT_900 900
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#define SC2731_CURRENT_LIMIT_2000 2000
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#define SC2731_CURRENT_PRECHG 450
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#define SC2731_CURRENT_STEP 50
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struct sc2731_charger_info {
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struct device *dev;
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struct regmap *regmap;
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struct usb_phy *usb_phy;
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struct notifier_block usb_notify;
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struct power_supply *psy_usb;
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struct work_struct work;
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struct mutex lock;
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bool charging;
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u32 base;
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u32 limit;
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};
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static void sc2731_charger_stop_charge(struct sc2731_charger_info *info)
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{
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regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
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SC2731_CC_EN, 0);
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regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
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SC2731_CHARGER_PD, SC2731_CHARGER_PD);
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}
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static int sc2731_charger_start_charge(struct sc2731_charger_info *info)
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{
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int ret;
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/* Enable charger constant current mode */
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ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
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SC2731_CC_EN, SC2731_CC_EN);
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if (ret)
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return ret;
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/* Start charging */
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return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
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SC2731_CHARGER_PD, 0);
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}
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static int sc2731_charger_set_current_limit(struct sc2731_charger_info *info,
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u32 limit)
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{
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u32 val;
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if (limit <= SC2731_CURRENT_LIMIT_100)
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val = 0;
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else if (limit <= SC2731_CURRENT_LIMIT_500)
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val = 3;
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else if (limit <= SC2731_CURRENT_LIMIT_900)
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val = 2;
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else
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val = 1;
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return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG5,
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SC2731_CUR_LIMIT_MASK,
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val << SC2731_CUR_LIMIT_SHIFT);
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}
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static int sc2731_charger_set_current(struct sc2731_charger_info *info, u32 cur)
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{
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u32 val;
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int ret;
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if (cur > SC2731_CURRENT_LIMIT_2000)
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cur = SC2731_CURRENT_LIMIT_2000;
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else if (cur < SC2731_CURRENT_PRECHG)
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cur = SC2731_CURRENT_PRECHG;
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/* Calculate the step value, each step is 50 mA */
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val = (cur - SC2731_CURRENT_PRECHG) / SC2731_CURRENT_STEP;
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/* Set pre-charge current as 450 mA */
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ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
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SC2731_PRECHG_RNG_MASK,
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0x3 << SC2731_PRECHG_RNG_SHIFT);
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if (ret)
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return ret;
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return regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG1,
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SC2731_CUR_MASK, val);
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}
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static int sc2731_charger_get_status(struct sc2731_charger_info *info)
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{
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u32 val;
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int ret;
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ret = regmap_read(info->regmap, SC2731_CHARGE_STATUS, &val);
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if (ret)
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return ret;
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if (val & SC2731_CHARGE_FULL)
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return POWER_SUPPLY_STATUS_FULL;
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return POWER_SUPPLY_STATUS_CHARGING;
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}
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static int sc2731_charger_get_current(struct sc2731_charger_info *info,
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u32 *cur)
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{
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int ret;
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u32 val;
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ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG1, &val);
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if (ret)
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return ret;
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val &= SC2731_CUR_MASK;
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*cur = val * SC2731_CURRENT_STEP + SC2731_CURRENT_PRECHG;
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return 0;
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}
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static int sc2731_charger_get_current_limit(struct sc2731_charger_info *info,
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u32 *cur)
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{
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int ret;
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u32 val;
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ret = regmap_read(info->regmap, info->base + SC2731_CHG_CFG5, &val);
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if (ret)
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return ret;
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val = (val & SC2731_CUR_LIMIT_MASK) >> SC2731_CUR_LIMIT_SHIFT;
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switch (val) {
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case 0:
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*cur = SC2731_CURRENT_LIMIT_100;
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break;
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case 1:
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*cur = SC2731_CURRENT_LIMIT_2000;
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break;
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case 2:
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*cur = SC2731_CURRENT_LIMIT_900;
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break;
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case 3:
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*cur = SC2731_CURRENT_LIMIT_500;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int
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sc2731_charger_usb_set_property(struct power_supply *psy,
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enum power_supply_property psp,
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const union power_supply_propval *val)
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{
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struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
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int ret;
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mutex_lock(&info->lock);
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if (!info->charging) {
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mutex_unlock(&info->lock);
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return -ENODEV;
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}
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switch (psp) {
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
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ret = sc2731_charger_set_current(info, val->intval / 1000);
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if (ret < 0)
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dev_err(info->dev, "set charge current failed\n");
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break;
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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ret = sc2731_charger_set_current_limit(info,
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val->intval / 1000);
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if (ret < 0)
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dev_err(info->dev, "set input current limit failed\n");
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break;
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default:
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ret = -EINVAL;
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}
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mutex_unlock(&info->lock);
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return ret;
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}
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static int sc2731_charger_usb_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct sc2731_charger_info *info = power_supply_get_drvdata(psy);
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int ret = 0;
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u32 cur;
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mutex_lock(&info->lock);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (info->charging)
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val->intval = sc2731_charger_get_status(info);
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else
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
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if (!info->charging) {
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val->intval = 0;
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} else {
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ret = sc2731_charger_get_current(info, &cur);
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if (ret)
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goto out;
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val->intval = cur * 1000;
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}
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break;
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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if (!info->charging) {
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val->intval = 0;
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} else {
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ret = sc2731_charger_get_current_limit(info, &cur);
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if (ret)
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goto out;
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val->intval = cur * 1000;
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}
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break;
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default:
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ret = -EINVAL;
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}
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out:
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mutex_unlock(&info->lock);
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return ret;
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}
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static int sc2731_charger_property_is_writeable(struct power_supply *psy,
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enum power_supply_property psp)
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{
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int ret;
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switch (psp) {
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case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
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case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
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ret = 1;
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break;
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default:
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ret = 0;
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}
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return ret;
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}
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static enum power_supply_property sc2731_usb_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
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POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
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};
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static const struct power_supply_desc sc2731_charger_desc = {
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.name = "sc2731_charger",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = sc2731_usb_props,
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.num_properties = ARRAY_SIZE(sc2731_usb_props),
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.get_property = sc2731_charger_usb_get_property,
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.set_property = sc2731_charger_usb_set_property,
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.property_is_writeable = sc2731_charger_property_is_writeable,
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};
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static void sc2731_charger_work(struct work_struct *data)
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{
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struct sc2731_charger_info *info =
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container_of(data, struct sc2731_charger_info, work);
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int ret;
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mutex_lock(&info->lock);
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if (info->limit > 0 && !info->charging) {
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/* set current limitation and start to charge */
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ret = sc2731_charger_set_current_limit(info, info->limit);
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if (ret)
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goto out;
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ret = sc2731_charger_set_current(info, info->limit);
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if (ret)
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goto out;
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ret = sc2731_charger_start_charge(info);
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if (ret)
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goto out;
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info->charging = true;
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} else if (!info->limit && info->charging) {
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/* Stop charging */
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info->charging = false;
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sc2731_charger_stop_charge(info);
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}
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out:
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mutex_unlock(&info->lock);
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}
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static int sc2731_charger_usb_change(struct notifier_block *nb,
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unsigned long limit, void *data)
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{
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struct sc2731_charger_info *info =
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container_of(nb, struct sc2731_charger_info, usb_notify);
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info->limit = limit;
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schedule_work(&info->work);
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return NOTIFY_OK;
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}
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static int sc2731_charger_hw_init(struct sc2731_charger_info *info)
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{
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struct power_supply_battery_info bat_info = { };
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u32 term_currrent, term_voltage, cur_val, vol_val;
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int ret;
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/* Enable charger module */
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ret = regmap_update_bits(info->regmap, SC2731_MODULE_EN1,
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SC2731_CHARGE_EN, SC2731_CHARGE_EN);
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if (ret)
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return ret;
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ret = power_supply_get_battery_info(info->psy_usb, &bat_info);
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if (ret) {
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dev_warn(info->dev, "no battery information is supplied\n");
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/*
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* If no battery information is supplied, we should set
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* default charge termination current to 120 mA, and default
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* charge termination voltage to 4.35V.
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*/
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cur_val = 0x2;
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vol_val = 0x1;
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} else {
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term_currrent = bat_info.charge_term_current_ua / 1000;
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if (term_currrent <= 90)
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cur_val = 0;
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else if (term_currrent >= 265)
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cur_val = 0x7;
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else
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cur_val = ((term_currrent - 90) / 25) + 1;
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term_voltage = bat_info.constant_charge_voltage_max_uv / 1000;
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if (term_voltage > 4500)
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term_voltage = 4500;
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if (term_voltage > 4200)
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vol_val = (term_voltage - 4200) / 100;
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else
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vol_val = 0;
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power_supply_put_battery_info(info->psy_usb, &bat_info);
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}
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/* Set charge termination current */
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ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG2,
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SC2731_TERMINATION_CUR_MASK, cur_val);
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if (ret)
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goto error;
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/* Set charge termination voltage */
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ret = regmap_update_bits(info->regmap, info->base + SC2731_CHG_CFG0,
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SC2731_TERMINATION_VOL_MASK |
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SC2731_TERMINATION_VOL_CAL_MASK,
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(vol_val << SC2731_TERMINATION_VOL_SHIFT) |
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(0x6 << SC2731_TERMINATION_VOL_CAL_SHIFT));
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if (ret)
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goto error;
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return 0;
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error:
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regmap_update_bits(info->regmap, SC2731_MODULE_EN1, SC2731_CHARGE_EN, 0);
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return ret;
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}
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static void sc2731_charger_detect_status(struct sc2731_charger_info *info)
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{
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unsigned int min, max;
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/*
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* If the USB charger status has been USB_CHARGER_PRESENT before
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* registering the notifier, we should start to charge with getting
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* the charge current.
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*/
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if (info->usb_phy->chg_state != USB_CHARGER_PRESENT)
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return;
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usb_phy_get_charger_current(info->usb_phy, &min, &max);
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info->limit = min;
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schedule_work(&info->work);
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}
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static int sc2731_charger_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct sc2731_charger_info *info;
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struct power_supply_config charger_cfg = { };
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int ret;
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info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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mutex_init(&info->lock);
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info->dev = &pdev->dev;
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INIT_WORK(&info->work, sc2731_charger_work);
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info->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!info->regmap) {
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dev_err(&pdev->dev, "failed to get charger regmap\n");
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return -ENODEV;
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}
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ret = of_property_read_u32(np, "reg", &info->base);
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if (ret) {
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dev_err(&pdev->dev, "failed to get register address\n");
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return -ENODEV;
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}
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charger_cfg.drv_data = info;
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charger_cfg.of_node = np;
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info->psy_usb = devm_power_supply_register(&pdev->dev,
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&sc2731_charger_desc,
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&charger_cfg);
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if (IS_ERR(info->psy_usb)) {
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dev_err(&pdev->dev, "failed to register power supply\n");
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return PTR_ERR(info->psy_usb);
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}
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ret = sc2731_charger_hw_init(info);
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if (ret)
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return ret;
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info->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "phys", 0);
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if (IS_ERR(info->usb_phy)) {
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dev_err(&pdev->dev, "failed to find USB phy\n");
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return PTR_ERR(info->usb_phy);
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}
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info->usb_notify.notifier_call = sc2731_charger_usb_change;
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ret = usb_register_notifier(info->usb_phy, &info->usb_notify);
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if (ret) {
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dev_err(&pdev->dev, "failed to register notifier: %d\n", ret);
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return ret;
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}
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sc2731_charger_detect_status(info);
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return 0;
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}
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static int sc2731_charger_remove(struct platform_device *pdev)
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{
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struct sc2731_charger_info *info = platform_get_drvdata(pdev);
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usb_unregister_notifier(info->usb_phy, &info->usb_notify);
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return 0;
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}
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static const struct of_device_id sc2731_charger_of_match[] = {
|
|
{ .compatible = "sprd,sc2731-charger", },
|
|
{ }
|
|
};
|
|
|
|
static struct platform_driver sc2731_charger_driver = {
|
|
.driver = {
|
|
.name = "sc2731-charger",
|
|
.of_match_table = sc2731_charger_of_match,
|
|
},
|
|
.probe = sc2731_charger_probe,
|
|
.remove = sc2731_charger_remove,
|
|
};
|
|
|
|
module_platform_driver(sc2731_charger_driver);
|
|
|
|
MODULE_DESCRIPTION("Spreadtrum SC2731 Charger Driver");
|
|
MODULE_LICENSE("GPL v2");
|