632 lines
14 KiB
C
632 lines
14 KiB
C
/*
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* Driver for LP8727 Micro/Mini USB IC with integrated charger
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*
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* Copyright (C) 2011 Texas Instruments
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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/platform_data/lp8727.h>
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#include <linux/of.h>
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#define LP8788_NUM_INTREGS 2
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#define DEFAULT_DEBOUNCE_MSEC 270
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/* Registers */
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#define LP8727_CTRL1 0x1
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#define LP8727_CTRL2 0x2
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#define LP8727_SWCTRL 0x3
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#define LP8727_INT1 0x4
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#define LP8727_INT2 0x5
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#define LP8727_STATUS1 0x6
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#define LP8727_STATUS2 0x7
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#define LP8727_CHGCTRL2 0x9
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/* CTRL1 register */
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#define LP8727_CP_EN BIT(0)
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#define LP8727_ADC_EN BIT(1)
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#define LP8727_ID200_EN BIT(4)
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/* CTRL2 register */
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#define LP8727_CHGDET_EN BIT(1)
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#define LP8727_INT_EN BIT(6)
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/* SWCTRL register */
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#define LP8727_SW_DM1_DM (0x0 << 0)
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#define LP8727_SW_DM1_HiZ (0x7 << 0)
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#define LP8727_SW_DP2_DP (0x0 << 3)
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#define LP8727_SW_DP2_HiZ (0x7 << 3)
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/* INT1 register */
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#define LP8727_IDNO (0xF << 0)
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#define LP8727_VBUS BIT(4)
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/* STATUS1 register */
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#define LP8727_CHGSTAT (3 << 4)
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#define LP8727_CHPORT BIT(6)
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#define LP8727_DCPORT BIT(7)
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#define LP8727_STAT_EOC 0x30
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/* STATUS2 register */
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#define LP8727_TEMP_STAT (3 << 5)
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#define LP8727_TEMP_SHIFT 5
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/* CHGCTRL2 register */
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#define LP8727_ICHG_SHIFT 4
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enum lp8727_dev_id {
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LP8727_ID_NONE,
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LP8727_ID_TA,
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LP8727_ID_DEDICATED_CHG,
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LP8727_ID_USB_CHG,
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LP8727_ID_USB_DS,
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LP8727_ID_MAX,
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};
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enum lp8727_die_temp {
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LP8788_TEMP_75C,
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LP8788_TEMP_95C,
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LP8788_TEMP_115C,
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LP8788_TEMP_135C,
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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 lp8727_psy *psy;
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struct lp8727_platform_data *pdata;
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/* Charger Data */
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enum lp8727_dev_id devid;
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struct lp8727_chg_param *chg_param;
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/* Interrupt Handling */
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int irq;
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struct delayed_work work;
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unsigned long debounce_jiffies;
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};
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static int lp8727_read_bytes(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 inline int lp8727_read_byte(struct lp8727_chg *pchg, u8 reg, u8 *data)
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{
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return lp8727_read_bytes(pchg, reg, data, 1);
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}
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static int lp8727_write_byte(struct lp8727_chg *pchg, u8 reg, u8 data)
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{
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int ret;
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mutex_lock(&pchg->xfer_lock);
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ret = i2c_smbus_write_byte_data(pchg->client, reg, 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 bool lp8727_is_charger_attached(const char *name, int id)
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{
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if (!strcmp(name, "ac"))
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return id == LP8727_ID_TA || id == LP8727_ID_DEDICATED_CHG;
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else if (!strcmp(name, "usb"))
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return id == LP8727_ID_USB_CHG;
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return id >= LP8727_ID_TA && id <= LP8727_ID_USB_CHG;
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}
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static int lp8727_init_device(struct lp8727_chg *pchg)
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{
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u8 val;
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int ret;
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u8 intstat[LP8788_NUM_INTREGS];
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/* clear interrupts */
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ret = lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS);
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if (ret)
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return ret;
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val = LP8727_ID200_EN | LP8727_ADC_EN | LP8727_CP_EN;
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ret = lp8727_write_byte(pchg, LP8727_CTRL1, val);
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if (ret)
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return ret;
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val = LP8727_INT_EN | LP8727_CHGDET_EN;
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return lp8727_write_byte(pchg, LP8727_CTRL2, val);
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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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lp8727_read_byte(pchg, LP8727_STATUS1, &val);
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return val & LP8727_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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lp8727_read_byte(pchg, LP8727_STATUS1, &val);
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return val & LP8727_CHPORT;
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}
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static inline void lp8727_ctrl_switch(struct lp8727_chg *pchg, u8 sw)
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{
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lp8727_write_byte(pchg, LP8727_SWCTRL, sw);
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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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struct lp8727_platform_data *pdata = pchg->pdata;
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u8 devid = LP8727_ID_NONE;
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u8 swctrl = LP8727_SW_DM1_HiZ | LP8727_SW_DP2_HiZ;
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switch (id) {
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case 0x5:
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devid = LP8727_ID_TA;
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pchg->chg_param = pdata ? pdata->ac : NULL;
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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_param = pdata ? pdata->ac : NULL;
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devid = LP8727_ID_DEDICATED_CHG;
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} else if (lp8727_is_usb_charger(pchg)) {
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pchg->chg_param = pdata ? pdata->usb : NULL;
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devid = LP8727_ID_USB_CHG;
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swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
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} else if (vbusin) {
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devid = LP8727_ID_USB_DS;
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swctrl = LP8727_SW_DM1_DM | LP8727_SW_DP2_DP;
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}
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break;
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default:
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devid = LP8727_ID_NONE;
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pchg->chg_param = 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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lp8727_read_byte(pchg, LP8727_CTRL2, &val);
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val |= LP8727_CHGDET_EN;
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lp8727_write_byte(pchg, LP8727_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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struct lp8727_chg *pchg = container_of(_work, struct lp8727_chg,
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work.work);
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u8 intstat[LP8788_NUM_INTREGS];
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u8 idno;
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u8 vbus;
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if (lp8727_read_bytes(pchg, LP8727_INT1, intstat, LP8788_NUM_INTREGS)) {
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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] & LP8727_IDNO;
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vbus = intstat[0] & LP8727_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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schedule_delayed_work(&pchg->work, pchg->debounce_jiffies);
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return IRQ_HANDLED;
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}
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static int lp8727_setup_irq(struct lp8727_chg *pchg)
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{
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int ret;
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int irq = pchg->client->irq;
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unsigned delay_msec = pchg->pdata ? pchg->pdata->debounce_msec :
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DEFAULT_DEBOUNCE_MSEC;
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INIT_DELAYED_WORK(&pchg->work, lp8727_delayed_func);
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if (irq <= 0) {
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dev_warn(pchg->dev, "invalid irq number: %d\n", irq);
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return 0;
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}
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ret = request_threaded_irq(irq, NULL, lp8727_isr_func,
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
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"lp8727_irq", pchg);
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if (ret)
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return ret;
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pchg->irq = irq;
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pchg->debounce_jiffies = msecs_to_jiffies(delay_msec);
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return 0;
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}
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static void lp8727_release_irq(struct lp8727_chg *pchg)
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{
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cancel_delayed_work_sync(&pchg->work);
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if (pchg->irq)
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free_irq(pchg->irq, pchg);
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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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return -EINVAL;
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val->intval = lp8727_is_charger_attached(psy->desc->name, pchg->devid);
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return 0;
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}
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static bool lp8727_is_high_temperature(enum lp8727_die_temp temp)
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{
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switch (temp) {
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case LP8788_TEMP_95C:
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case LP8788_TEMP_115C:
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case LP8788_TEMP_135C:
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return true;
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default:
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return false;
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}
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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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struct lp8727_platform_data *pdata = pchg->pdata;
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enum lp8727_die_temp temp;
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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->desc->name, pchg->devid)) {
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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return 0;
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}
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lp8727_read_byte(pchg, LP8727_STATUS1, &read);
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val->intval = (read & LP8727_CHGSTAT) == LP8727_STAT_EOC ?
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POWER_SUPPLY_STATUS_FULL :
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POWER_SUPPLY_STATUS_CHARGING;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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lp8727_read_byte(pchg, LP8727_STATUS2, &read);
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temp = (read & LP8727_TEMP_STAT) >> LP8727_TEMP_SHIFT;
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val->intval = lp8727_is_high_temperature(temp) ?
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POWER_SUPPLY_HEALTH_OVERHEAT :
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POWER_SUPPLY_HEALTH_GOOD;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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if (!pdata)
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return -EINVAL;
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if (pdata->get_batt_present)
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val->intval = pdata->get_batt_present();
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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if (!pdata)
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return -EINVAL;
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if (pdata->get_batt_level)
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val->intval = pdata->get_batt_level();
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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if (!pdata)
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return -EINVAL;
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if (pdata->get_batt_capacity)
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val->intval = pdata->get_batt_capacity();
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break;
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case POWER_SUPPLY_PROP_TEMP:
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if (!pdata)
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return -EINVAL;
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if (pdata->get_batt_temp)
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val->intval = 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 eoc_level;
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u8 ichg;
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u8 val;
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/* skip if no charger exists */
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if (!lp8727_is_charger_attached(psy->desc->name, pchg->devid))
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return;
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/* update charging parameters */
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if (pchg->chg_param) {
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eoc_level = pchg->chg_param->eoc_level;
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ichg = pchg->chg_param->ichg;
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val = (ichg << LP8727_ICHG_SHIFT) | eoc_level;
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lp8727_write_byte(pchg, LP8727_CHGCTRL2, val);
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}
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}
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static const struct power_supply_desc lp8727_ac_desc = {
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.name = "ac",
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.type = POWER_SUPPLY_TYPE_MAINS,
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.properties = lp8727_charger_prop,
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.num_properties = ARRAY_SIZE(lp8727_charger_prop),
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.get_property = lp8727_charger_get_property,
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};
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static const struct power_supply_desc lp8727_usb_desc = {
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.name = "usb",
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.type = POWER_SUPPLY_TYPE_USB,
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.properties = lp8727_charger_prop,
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.num_properties = ARRAY_SIZE(lp8727_charger_prop),
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.get_property = lp8727_charger_get_property,
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};
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static const struct power_supply_desc lp8727_batt_desc = {
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.name = "main_batt",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = lp8727_battery_prop,
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.num_properties = ARRAY_SIZE(lp8727_battery_prop),
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.get_property = lp8727_battery_get_property,
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.external_power_changed = lp8727_charger_changed,
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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 power_supply_config psy_cfg = {}; /* Only for ac and usb */
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struct lp8727_psy *psy;
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psy = devm_kzalloc(pchg->dev, sizeof(*psy), GFP_KERNEL);
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if (!psy)
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return -ENOMEM;
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pchg->psy = psy;
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psy_cfg.supplied_to = battery_supplied_to;
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psy_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
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psy->ac = power_supply_register(pchg->dev, &lp8727_ac_desc, &psy_cfg);
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if (IS_ERR(psy->ac))
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goto err_psy_ac;
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psy->usb = power_supply_register(pchg->dev, &lp8727_usb_desc,
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&psy_cfg);
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if (IS_ERR(psy->usb))
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goto err_psy_usb;
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psy->batt = power_supply_register(pchg->dev, &lp8727_batt_desc, NULL);
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if (IS_ERR(psy->batt))
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goto err_psy_batt;
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return 0;
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err_psy_batt:
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power_supply_unregister(psy->usb);
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err_psy_usb:
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power_supply_unregister(psy->ac);
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err_psy_ac:
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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)
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return;
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power_supply_unregister(psy->ac);
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power_supply_unregister(psy->usb);
|
|
power_supply_unregister(psy->batt);
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static struct lp8727_chg_param
|
|
*lp8727_parse_charge_pdata(struct device *dev, struct device_node *np)
|
|
{
|
|
struct lp8727_chg_param *param;
|
|
|
|
param = devm_kzalloc(dev, sizeof(*param), GFP_KERNEL);
|
|
if (!param)
|
|
goto out;
|
|
|
|
of_property_read_u8(np, "eoc-level", (u8 *)¶m->eoc_level);
|
|
of_property_read_u8(np, "charging-current", (u8 *)¶m->ichg);
|
|
out:
|
|
return param;
|
|
}
|
|
|
|
static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
struct device_node *child;
|
|
struct lp8727_platform_data *pdata;
|
|
const char *type;
|
|
|
|
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
|
|
if (!pdata)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
of_property_read_u32(np, "debounce-ms", &pdata->debounce_msec);
|
|
|
|
/* If charging parameter is not defined, just skip parsing the dt */
|
|
if (of_get_child_count(np) == 0)
|
|
return pdata;
|
|
|
|
for_each_child_of_node(np, child) {
|
|
of_property_read_string(child, "charger-type", &type);
|
|
|
|
if (!strcmp(type, "ac"))
|
|
pdata->ac = lp8727_parse_charge_pdata(dev, child);
|
|
|
|
if (!strcmp(type, "usb"))
|
|
pdata->usb = lp8727_parse_charge_pdata(dev, child);
|
|
}
|
|
|
|
return pdata;
|
|
}
|
|
#else
|
|
static struct lp8727_platform_data *lp8727_parse_dt(struct device *dev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
static int lp8727_probe(struct i2c_client *cl, const struct i2c_device_id *id)
|
|
{
|
|
struct lp8727_chg *pchg;
|
|
struct lp8727_platform_data *pdata;
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(cl->adapter, I2C_FUNC_SMBUS_I2C_BLOCK))
|
|
return -EIO;
|
|
|
|
if (cl->dev.of_node) {
|
|
pdata = lp8727_parse_dt(&cl->dev);
|
|
if (IS_ERR(pdata))
|
|
return PTR_ERR(pdata);
|
|
} else {
|
|
pdata = dev_get_platdata(&cl->dev);
|
|
}
|
|
|
|
pchg = devm_kzalloc(&cl->dev, sizeof(*pchg), GFP_KERNEL);
|
|
if (!pchg)
|
|
return -ENOMEM;
|
|
|
|
pchg->client = cl;
|
|
pchg->dev = &cl->dev;
|
|
pchg->pdata = pdata;
|
|
i2c_set_clientdata(cl, pchg);
|
|
|
|
mutex_init(&pchg->xfer_lock);
|
|
|
|
ret = lp8727_init_device(pchg);
|
|
if (ret) {
|
|
dev_err(pchg->dev, "i2c communication err: %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = lp8727_register_psy(pchg);
|
|
if (ret) {
|
|
dev_err(pchg->dev, "power supplies register err: %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = lp8727_setup_irq(pchg);
|
|
if (ret) {
|
|
dev_err(pchg->dev, "irq handler err: %d", ret);
|
|
lp8727_unregister_psy(pchg);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int lp8727_remove(struct i2c_client *cl)
|
|
{
|
|
struct lp8727_chg *pchg = i2c_get_clientdata(cl);
|
|
|
|
lp8727_release_irq(pchg);
|
|
lp8727_unregister_psy(pchg);
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id lp8727_dt_ids[] = {
|
|
{ .compatible = "ti,lp8727", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, lp8727_dt_ids);
|
|
|
|
static const struct i2c_device_id lp8727_ids[] = {
|
|
{"lp8727", 0},
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, lp8727_ids);
|
|
|
|
static struct i2c_driver lp8727_driver = {
|
|
.driver = {
|
|
.name = "lp8727",
|
|
.of_match_table = of_match_ptr(lp8727_dt_ids),
|
|
},
|
|
.probe = lp8727_probe,
|
|
.remove = lp8727_remove,
|
|
.id_table = lp8727_ids,
|
|
};
|
|
module_i2c_driver(lp8727_driver);
|
|
|
|
MODULE_DESCRIPTION("TI/National Semiconductor LP8727 charger driver");
|
|
MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>, Daniel Jeong <daniel.jeong@ti.com>");
|
|
MODULE_LICENSE("GPL");
|