diff options
Diffstat (limited to 'drivers/power')
| -rw-r--r-- | drivers/power/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/power/Makefile | 1 | ||||
| -rw-r--r-- | drivers/power/tps65090-charger.c | 315 |
3 files changed, 323 insertions, 0 deletions
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index 07e1a8f8d03e..339f802b91c1 100644 --- a/drivers/power/Kconfig +++ b/drivers/power/Kconfig @@ -340,6 +340,13 @@ config CHARGER_SMB347 Say Y to include support for Summit Microelectronics SMB347 Battery Charger. +config CHARGER_TPS65090 + tristate "TPS65090 battery charger driver" + depends on MFD_TPS65090 + help + Say Y here to enable support for battery charging with TPS65090 + PMIC chips. + config AB8500_BM bool "AB8500 Battery Management Driver" depends on AB8500_CORE && AB8500_GPADC diff --git a/drivers/power/Makefile b/drivers/power/Makefile index eb520ea74970..653bf6ceff30 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -52,4 +52,5 @@ obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o obj-$(CONFIG_POWER_AVS) += avs/ obj-$(CONFIG_CHARGER_SMB347) += smb347-charger.o +obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o obj-$(CONFIG_POWER_RESET) += reset/ diff --git a/drivers/power/tps65090-charger.c b/drivers/power/tps65090-charger.c new file mode 100644 index 000000000000..0c66c6656b13 --- /dev/null +++ b/drivers/power/tps65090-charger.c @@ -0,0 +1,315 @@ +/* + * Battery charger driver for TI's tps65090 + * + * Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved. + + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + + * This program is distributed in the hope 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. + + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/mfd/tps65090.h> + +#define TPS65090_REG_INTR_STS 0x00 +#define TPS65090_REG_CG_CTRL0 0x04 +#define TPS65090_REG_CG_CTRL1 0x05 +#define TPS65090_REG_CG_CTRL2 0x06 +#define TPS65090_REG_CG_CTRL3 0x07 +#define TPS65090_REG_CG_CTRL4 0x08 +#define TPS65090_REG_CG_CTRL5 0x09 +#define TPS65090_REG_CG_STATUS1 0x0a +#define TPS65090_REG_CG_STATUS2 0x0b + +#define TPS65090_CHARGER_ENABLE BIT(0) +#define TPS65090_VACG BIT(1) +#define TPS65090_NOITERM BIT(5) + +struct tps65090_charger { + struct device *dev; + int ac_online; + int prev_ac_online; + int irq; + struct power_supply ac; + struct tps65090_platform_data *pdata; +}; + +static enum power_supply_property tps65090_ac_props[] = { + POWER_SUPPLY_PROP_ONLINE, +}; + +static int tps65090_low_chrg_current(struct tps65090_charger *charger) +{ + int ret; + + ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL5, + TPS65090_NOITERM); + if (ret < 0) { + dev_err(charger->dev, "%s(): error reading in register 0x%x\n", + __func__, TPS65090_REG_CG_CTRL5); + return ret; + } + return 0; +} + +static int tps65090_enable_charging(struct tps65090_charger *charger, + uint8_t enable) +{ + int ret; + uint8_t ctrl0 = 0; + + ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_CTRL0, + &ctrl0); + if (ret < 0) { + dev_err(charger->dev, "%s(): error reading in register 0x%x\n", + __func__, TPS65090_REG_CG_CTRL0); + return ret; + } + + ret = tps65090_write(charger->dev->parent, TPS65090_REG_CG_CTRL0, + (ctrl0 | TPS65090_CHARGER_ENABLE)); + if (ret < 0) { + dev_err(charger->dev, "%s(): error reading in register 0x%x\n", + __func__, TPS65090_REG_CG_CTRL0); + return ret; + } + return 0; +} + +static int tps65090_config_charger(struct tps65090_charger *charger) +{ + int ret; + + if (charger->pdata->enable_low_current_chrg) { + ret = tps65090_low_chrg_current(charger); + if (ret < 0) { + dev_err(charger->dev, + "error configuring low charge current\n"); + return ret; + } + } + + return 0; +} + +static int tps65090_ac_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct tps65090_charger *charger = container_of(psy, + struct tps65090_charger, ac); + + if (psp == POWER_SUPPLY_PROP_ONLINE) { + val->intval = charger->ac_online; + charger->prev_ac_online = charger->ac_online; + return 0; + } + return -EINVAL; +} + +static irqreturn_t tps65090_charger_isr(int irq, void *dev_id) +{ + struct tps65090_charger *charger = dev_id; + int ret; + uint8_t status1 = 0; + uint8_t intrsts = 0; + + ret = tps65090_read(charger->dev->parent, TPS65090_REG_CG_STATUS1, + &status1); + if (ret < 0) { + dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n", + __func__, TPS65090_REG_CG_STATUS1); + return IRQ_HANDLED; + } + msleep(75); + ret = tps65090_read(charger->dev->parent, TPS65090_REG_INTR_STS, + &intrsts); + if (ret < 0) { + dev_err(charger->dev, "%s(): Error in reading reg 0x%x\n", + __func__, TPS65090_REG_INTR_STS); + return IRQ_HANDLED; + } + + if (intrsts & TPS65090_VACG) { + ret = tps65090_enable_charging(charger, 1); + if (ret < 0) + return IRQ_HANDLED; + charger->ac_online = 1; + } else { + charger->ac_online = 0; + } + + if (charger->prev_ac_online != charger->ac_online) + power_supply_changed(&charger->ac); + + return IRQ_HANDLED; +} + +#if defined(CONFIG_OF) + +#include <linux/of_device.h> + +static struct tps65090_platform_data * + tps65090_parse_dt_charger_data(struct platform_device *pdev) +{ + struct tps65090_platform_data *pdata; + struct device_node *np = pdev->dev.parent->of_node; + unsigned int prop; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL); + if (!pdata) { + dev_err(&pdev->dev, "Memory alloc for tps65090_pdata failed\n"); + return NULL; + } + + prop = of_property_read_bool(np, "ti,enable-low-current-chrg"); + pdata->enable_low_current_chrg = prop; + + pdata->irq_base = -1; + + return pdata; + +} +#else +static struct tps65090_platform_data * + tps65090_parse_dt_charger_data(struct platform_device *pdev) +{ + return NULL; +} +#endif + +static int tps65090_charger_probe(struct platform_device *pdev) +{ + struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent); + struct tps65090_charger *cdata; + struct tps65090_platform_data *pdata; + uint8_t status1 = 0; + int ret; + int irq; + + pdata = dev_get_platdata(pdev->dev.parent); + + if (!pdata && tps65090_mfd->dev->of_node) + pdata = tps65090_parse_dt_charger_data(pdev); + + if (!pdata) { + dev_err(&pdev->dev, "%s():no platform data available\n", + __func__); + return -ENODEV; + } + + cdata = devm_kzalloc(&pdev->dev, sizeof(*cdata), GFP_KERNEL); + if (!cdata) { + dev_err(&pdev->dev, "failed to allocate memory status\n"); + return -ENOMEM; + } + + dev_set_drvdata(&pdev->dev, cdata); + + cdata->dev = &pdev->dev; + cdata->pdata = pdata; + + cdata->ac.name = "tps65090-ac"; + cdata->ac.type = POWER_SUPPLY_TYPE_MAINS; + cdata->ac.get_property = tps65090_ac_get_property; + cdata->ac.properties = tps65090_ac_props; + cdata->ac.num_properties = ARRAY_SIZE(tps65090_ac_props); + cdata->ac.supplied_to = pdata->supplied_to; + cdata->ac.num_supplicants = pdata->num_supplicants; + + ret = power_supply_register(&pdev->dev, &cdata->ac); + if (ret) { + dev_err(&pdev->dev, "failed: power supply register\n"); + return ret; + } + + irq = platform_get_irq(pdev, 0); + if (irq <= 0) { + dev_warn(&pdev->dev, "Unable to get charger irq = %d\n", irq); + ret = irq; + goto fail_unregister_supply; + } + + cdata->irq = irq; + + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, + tps65090_charger_isr, 0, "tps65090-charger", cdata); + if (ret) { + dev_err(cdata->dev, "Unable to register irq %d err %d\n", irq, + ret); + goto fail_free_irq; + } + + ret = tps65090_config_charger(cdata); + if (ret < 0) { + dev_err(&pdev->dev, "charger config failed, err %d\n", ret); + goto fail_free_irq; + } + + /* Check for charger presence */ + ret = tps65090_read(cdata->dev->parent, TPS65090_REG_CG_STATUS1, + &status1); + if (ret < 0) { + dev_err(cdata->dev, "%s(): Error in reading reg 0x%x", __func__, + TPS65090_REG_CG_STATUS1); + goto fail_free_irq; + } + + if (status1 != 0) { + ret = tps65090_enable_charging(cdata, 1); + if (ret < 0) { + dev_err(cdata->dev, "error enabling charger\n"); + goto fail_free_irq; + } + cdata->ac_online = 1; + power_supply_changed(&cdata->ac); + } + + return 0; + +fail_free_irq: + devm_free_irq(cdata->dev, irq, cdata); +fail_unregister_supply: + power_supply_unregister(&cdata->ac); + + return ret; +} + +static int tps65090_charger_remove(struct platform_device *pdev) +{ + struct tps65090_charger *cdata = dev_get_drvdata(&pdev->dev); + + devm_free_irq(cdata->dev, cdata->irq, cdata); + power_supply_unregister(&cdata->ac); + + return 0; +} + +static struct platform_driver tps65090_charger_driver = { + .driver = { + .name = "tps65090-charger", + .owner = THIS_MODULE, + }, + .probe = tps65090_charger_probe, + .remove = tps65090_charger_remove, +}; +module_platform_driver(tps65090_charger_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Syed Rafiuddin <srafiuddin@nvidia.com>"); +MODULE_DESCRIPTION("tps65090 battery charger driver"); |