power_supply: Add LP8727 charger driver
National Semiconductor LP8727 is the battery charger with Micro/Mini USB interface. This IC includes below functions: - I2C interface for accessing user registers - Single input Li-Ion battery charger - Charger input ID detection from Micro/Mini USB - Multiplexing switches on USB, UART Signed-off-by: Woogyom Kim <milo.kim@ti.com> Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
This commit is contained in:
Woogyom Kim
Anton Vorontsov
parent
ad3d13eee7
commit
2165c8a45b
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@ -225,6 +225,12 @@ config CHARGER_TWL4030
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help
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Say Y here to enable support for TWL4030 Battery Charge Interface.
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config CHARGER_LP8727
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tristate "National Semiconductor LP8727 charger driver"
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depends on I2C
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help
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Say Y here to enable support for LP8727 Charger Driver.
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config CHARGER_GPIO
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tristate "GPIO charger"
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depends on GPIOLIB
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@ -35,6 +35,7 @@ obj-$(CONFIG_BATTERY_INTEL_MID) += intel_mid_battery.o
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obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
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obj-$(CONFIG_CHARGER_MAX8903) += max8903_charger.o
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obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
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obj-$(CONFIG_CHARGER_LP8727) += lp8727_charger.o
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obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
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obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
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obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
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@ -0,0 +1,491 @@
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/*
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* Driver for LP8727 Micro/Mini USB IC with intergrated charger
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*
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* Copyright (C) 2011 National Semiconductor
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/i2c.h>
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#include <linux/power_supply.h>
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#include <linux/lp8727.h>
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#define DEBOUNCE_MSEC 270
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/* Registers */
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#define CTRL1 0x1
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#define CTRL2 0x2
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#define SWCTRL 0x3
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#define INT1 0x4
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#define INT2 0x5
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#define STATUS1 0x6
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#define STATUS2 0x7
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#define CHGCTRL2 0x9
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/* CTRL1 register */
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#define CP_EN (1 << 0)
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#define ADC_EN (1 << 1)
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#define ID200_EN (1 << 4)
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/* CTRL2 register */
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#define CHGDET_EN (1 << 1)
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#define INT_EN (1 << 6)
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/* SWCTRL register */
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#define SW_DM1_DM (0x0 << 0)
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#define SW_DM1_U1 (0x1 << 0)
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#define SW_DM1_HiZ (0x7 << 0)
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#define SW_DP2_DP (0x0 << 3)
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#define SW_DP2_U2 (0x1 << 3)
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#define SW_DP2_HiZ (0x7 << 3)
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/* INT1 register */
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#define IDNO (0xF << 0)
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#define VBUS (1 << 4)
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/* STATUS1 register */
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#define CHGSTAT (3 << 4)
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#define CHPORT (1 << 6)
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#define DCPORT (1 << 7)
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/* STATUS2 register */
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#define TEMP_STAT (3 << 5)
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enum lp8727_dev_id {
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ID_NONE,
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ID_TA,
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ID_DEDICATED_CHG,
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ID_USB_CHG,
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ID_USB_DS,
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ID_MAX,
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};
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enum lp8727_chg_stat {
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PRECHG,
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CC,
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CV,
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EOC,
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};
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struct lp8727_psy {
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struct power_supply ac;
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struct power_supply usb;
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struct power_supply batt;
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};
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struct lp8727_chg {
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struct device *dev;
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struct i2c_client *client;
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struct mutex xfer_lock;
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struct delayed_work work;
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struct workqueue_struct *irqthread;
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struct lp8727_platform_data *pdata;
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struct lp8727_psy *psy;
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struct lp8727_chg_param *chg_parm;
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enum lp8727_dev_id devid;
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};
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static int lp8727_i2c_read(struct lp8727_chg *pchg, u8 reg, u8 * data, u8 len)
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{
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s32 ret;
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mutex_lock(&pchg->xfer_lock);
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ret = i2c_smbus_read_i2c_block_data(pchg->client, reg, len, data);
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mutex_unlock(&pchg->xfer_lock);
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return (ret != len) ? -EIO : 0;
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}
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static int lp8727_i2c_write(struct lp8727_chg *pchg, u8 reg, u8 * data, u8 len)
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{
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s32 ret;
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mutex_lock(&pchg->xfer_lock);
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ret = i2c_smbus_write_i2c_block_data(pchg->client, reg, len, data);
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mutex_unlock(&pchg->xfer_lock);
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return ret;
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}
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static inline int lp8727_i2c_read_byte(struct lp8727_chg *pchg, u8 reg,
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u8 * data)
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{
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return lp8727_i2c_read(pchg, reg, data, 1);
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}
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static inline int lp8727_i2c_write_byte(struct lp8727_chg *pchg, u8 reg,
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u8 * data)
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{
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return lp8727_i2c_write(pchg, reg, data, 1);
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}
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static int lp8727_is_charger_attached(const char *name, int id)
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{
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if (name) {
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if (!strcmp(name, "ac"))
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return (id == ID_TA || id == ID_DEDICATED_CHG) ? 1 : 0;
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else if (!strcmp(name, "usb"))
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return (id == ID_USB_CHG) ? 1 : 0;
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}
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return (id >= ID_TA && id <= ID_USB_CHG) ? 1 : 0;
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}
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static void lp8727_init_device(struct lp8727_chg *pchg)
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{
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u8 val;
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val = ID200_EN | ADC_EN | CP_EN;
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if (lp8727_i2c_write_byte(pchg, CTRL1, &val))
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dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL1);
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val = INT_EN | CHGDET_EN;
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if (lp8727_i2c_write_byte(pchg, CTRL2, &val))
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dev_err(pchg->dev, "i2c write err : addr=0x%.2x\n", CTRL2);
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}
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static int lp8727_is_dedicated_charger(struct lp8727_chg *pchg)
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{
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u8 val;
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(void)lp8727_i2c_read_byte(pchg, STATUS1, &val);
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return (val & DCPORT);
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}
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static int lp8727_is_usb_charger(struct lp8727_chg *pchg)
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{
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u8 val;
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(void)lp8727_i2c_read_byte(pchg, STATUS1, &val);
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return (val & CHPORT);
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}
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static void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
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{
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u8 val = sw;
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(void)lp8727_i2c_write_byte(pchg, SWCTRL, &val);
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}
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static void lp8727_id_detection(struct lp8727_chg *pchg, u8 id, int vbusin)
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{
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u8 devid = ID_NONE;
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u8 swctrl = SW_DM1_HiZ | SW_DP2_HiZ;
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switch (id) {
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case 0x5:
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devid = ID_TA;
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pchg->chg_parm = &pchg->pdata->ac;
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break;
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case 0xB:
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if (lp8727_is_dedicated_charger(pchg)) {
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pchg->chg_parm = &pchg->pdata->ac;
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devid = ID_DEDICATED_CHG;
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} else if (lp8727_is_usb_charger(pchg)) {
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pchg->chg_parm = &pchg->pdata->usb;
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devid = ID_USB_CHG;
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swctrl = SW_DM1_DM | SW_DP2_DP;
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} else if (vbusin) {
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devid = ID_USB_DS;
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swctrl = SW_DM1_DM | SW_DP2_DP;
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}
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break;
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default:
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devid = ID_NONE;
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pchg->chg_parm = NULL;
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break;
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}
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pchg->devid = devid;
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lp8727_ctrl_switch(pchg, swctrl);
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}
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static void lp8727_enable_chgdet(struct lp8727_chg *pchg)
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{
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u8 val;
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(void)lp8727_i2c_read_byte(pchg, CTRL2, &val);
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val |= CHGDET_EN;
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(void)lp8727_i2c_write_byte(pchg, CTRL2, &val);
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}
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static void lp8727_delayed_func(struct work_struct *_work)
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{
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u8 intstat[2], idno, vbus;
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struct lp8727_chg *pchg =
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container_of(_work, struct lp8727_chg, work.work);
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if (lp8727_i2c_read(pchg, INT1, intstat, 2)) {
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dev_err(pchg->dev, "can not read INT registers\n");
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return;
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}
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idno = intstat[0] & IDNO;
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vbus = intstat[0] & VBUS;
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lp8727_id_detection(pchg, idno, vbus);
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lp8727_enable_chgdet(pchg);
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power_supply_changed(&pchg->psy->ac);
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power_supply_changed(&pchg->psy->usb);
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power_supply_changed(&pchg->psy->batt);
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}
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static irqreturn_t lp8727_isr_func(int irq, void *ptr)
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{
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struct lp8727_chg *pchg = ptr;
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unsigned long delay = msecs_to_jiffies(DEBOUNCE_MSEC);
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queue_delayed_work(pchg->irqthread, &pchg->work, delay);
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return IRQ_HANDLED;
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}
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static void lp8727_intr_config(struct lp8727_chg *pchg)
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{
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INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
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pchg->irqthread = create_singlethread_workqueue("lp8727-irqthd");
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if (!pchg->irqthread)
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dev_err(pchg->dev, "can not create thread for lp8727\n");
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if (request_threaded_irq(pchg->client->irq,
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NULL,
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lp8727_isr_func,
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IRQF_TRIGGER_FALLING, "lp8727_irq", pchg)) {
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dev_err(pchg->dev, "lp8727 irq can not be registered\n");
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}
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}
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static enum power_supply_property lp8727_charger_prop[] = {
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POWER_SUPPLY_PROP_ONLINE,
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};
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static enum power_supply_property lp8727_battery_prop[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_TEMP,
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};
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static char *battery_supplied_to[] = {
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"main_batt",
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};
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static int lp8727_charger_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 lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
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if (psp == POWER_SUPPLY_PROP_ONLINE) {
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val->intval = lp8727_is_charger_attached(psy->name,
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pchg->devid);
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}
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return 0;
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}
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static int lp8727_battery_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 lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
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u8 read;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
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(void)lp8727_i2c_read_byte(pchg, STATUS1, &read);
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if (((read & CHGSTAT) >> 4) == EOC)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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} else {
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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}
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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(void)lp8727_i2c_read_byte(pchg, STATUS2, &read);
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read = (read & TEMP_STAT) >> 5;
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if (read >= 0x1 && read <= 0x3)
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val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
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else
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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if (pchg->pdata->get_batt_present)
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val->intval = pchg->pdata->get_batt_present();
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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if (pchg->pdata->get_batt_level)
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val->intval = pchg->pdata->get_batt_level();
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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if (pchg->pdata->get_batt_capacity)
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val->intval = pchg->pdata->get_batt_capacity();
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break;
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case POWER_SUPPLY_PROP_TEMP:
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if (pchg->pdata->get_batt_temp)
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val->intval = pchg->pdata->get_batt_temp();
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break;
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default:
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break;
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}
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return 0;
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}
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static void lp8727_charger_changed(struct power_supply *psy)
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{
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struct lp8727_chg *pchg = dev_get_drvdata(psy->dev->parent);
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u8 val;
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u8 eoc_level, ichg;
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if (lp8727_is_charger_attached(psy->name, pchg->devid)) {
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if (pchg->chg_parm) {
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eoc_level = pchg->chg_parm->eoc_level;
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ichg = pchg->chg_parm->ichg;
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val = (ichg << 4) | eoc_level;
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(void)lp8727_i2c_write_byte(pchg, CHGCTRL2, &val);
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}
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}
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}
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static int lp8727_register_psy(struct lp8727_chg *pchg)
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{
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struct lp8727_psy *psy;
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psy = kzalloc(sizeof(*psy), GFP_KERNEL);
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if (!psy)
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goto err_mem;
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pchg->psy = psy;
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psy->ac.name = "ac";
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psy->ac.type = POWER_SUPPLY_TYPE_MAINS;
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psy->ac.properties = lp8727_charger_prop;
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psy->ac.num_properties = ARRAY_SIZE(lp8727_charger_prop);
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psy->ac.get_property = lp8727_charger_get_property;
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psy->ac.supplied_to = battery_supplied_to;
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psy->ac.num_supplicants = ARRAY_SIZE(battery_supplied_to);
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if (power_supply_register(pchg->dev, &psy->ac))
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goto err_psy;
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psy->usb.name = "usb";
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psy->usb.type = POWER_SUPPLY_TYPE_USB;
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psy->usb.properties = lp8727_charger_prop;
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psy->usb.num_properties = ARRAY_SIZE(lp8727_charger_prop);
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psy->usb.get_property = lp8727_charger_get_property;
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psy->usb.supplied_to = battery_supplied_to;
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psy->usb.num_supplicants = ARRAY_SIZE(battery_supplied_to);
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if (power_supply_register(pchg->dev, &psy->usb))
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goto err_psy;
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psy->batt.name = "main_batt";
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psy->batt.type = POWER_SUPPLY_TYPE_BATTERY;
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psy->batt.properties = lp8727_battery_prop;
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psy->batt.num_properties = ARRAY_SIZE(lp8727_battery_prop);
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psy->batt.get_property = lp8727_battery_get_property;
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psy->batt.external_power_changed = lp8727_charger_changed;
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if (power_supply_register(pchg->dev, &psy->batt))
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goto err_psy;
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return 0;
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err_mem:
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return -ENOMEM;
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err_psy:
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kfree(psy);
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return -EPERM;
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}
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static void lp8727_unregister_psy(struct lp8727_chg *pchg)
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{
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struct lp8727_psy *psy = pchg->psy;
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if (psy) {
|
||||
power_supply_unregister(&psy->ac);
|
||||
power_supply_unregister(&psy->usb);
|
||||
power_supply_unregister(&psy->batt);
|
||||
kfree(psy);
|
||||
}
|
||||
}
|
||||
|
||||
static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
|
||||
{
|
||||
struct lp8727_chg *pchg;
|
||||
int ret;
|
||||
|
||||
pchg = kzalloc(sizeof(*pchg), GFP_KERNEL);
|
||||
if (!pchg)
|
||||
return -ENOMEM;
|
||||
|
||||
pchg->client = cl;
|
||||
pchg->dev = &cl->dev;
|
||||
pchg->pdata = cl->dev.platform_data;
|
||||
i2c_set_clientdata(cl, pchg);
|
||||
|
||||
mutex_init(&pchg->xfer_lock);
|
||||
|
||||
lp8727_init_device(pchg);
|
||||
lp8727_intr_config(pchg);
|
||||
|
||||
ret = lp8727_register_psy(pchg);
|
||||
if (ret) {
|
||||
dev_err(pchg->dev,
|
||||
"can not register power supplies. err=%d", ret);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devexit lp8727_remove(struct i2c_client *cl)
|
||||
{
|
||||
struct lp8727_chg *pchg = i2c_get_clientdata(cl);
|
||||
|
||||
lp8727_unregister_psy(pchg);
|
||||
free_irq(pchg->client->irq, pchg);
|
||||
flush_workqueue(pchg->irqthread);
|
||||
destroy_workqueue(pchg->irqthread);
|
||||
kfree(pchg);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct i2c_device_id lp8727_ids[] = {
|
||||
{"lp8727", 0},
|
||||
};
|
||||
|
||||
static struct i2c_driver lp8727_driver = {
|
||||
.driver = {
|
||||
.name = "lp8727",
|
||||
},
|
||||
.probe = lp8727_probe,
|
||||
.remove = __devexit_p(lp8727_remove),
|
||||
.id_table = lp8727_ids,
|
||||
};
|
||||
|
||||
static int __init lp8727_init(void)
|
||||
{
|
||||
return i2c_add_driver(&lp8727_driver);
|
||||
}
|
||||
|
||||
static void __exit lp8727_chg_exit(void)
|
||||
{
|
||||
i2c_del_driver(&lp8727_driver);
|
||||
}
|
||||
|
||||
module_init(lp8727_init);
|
||||
module_exit(lp8727_chg_exit);
|
||||
|
||||
MODULE_DESCRIPTION("National Semiconductor LP8727 charger driver");
|
||||
MODULE_AUTHOR("Woogyom Kim <milo.kim@nsc.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue