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linux/drivers/power/twl4030_charger.c

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/*
* TWL4030/TPS65950 BCI (Battery Charger Interface) driver
*
* Copyright (C) 2010 Gražvydas Ignotas <notasas@gmail.com>
*
* based on twl4030_bci_battery.c by TI
* Copyright (C) 2008 Texas Instruments, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/i2c/twl.h>
#include <linux/power_supply.h>
#include <linux/notifier.h>
#include <linux/usb/otg.h>
#include <linux/iio/consumer.h>
#define TWL4030_BCIMDEN 0x00
#define TWL4030_BCIMDKEY 0x01
#define TWL4030_BCIMSTATEC 0x02
#define TWL4030_BCIICHG 0x08
#define TWL4030_BCIVAC 0x0a
#define TWL4030_BCIVBUS 0x0c
#define TWL4030_BCIMFSTS3 0x0F
#define TWL4030_BCIMFSTS4 0x10
#define TWL4030_BCICTL1 0x23
#define TWL4030_BB_CFG 0x12
#define TWL4030_BCIIREF1 0x27
#define TWL4030_BCIIREF2 0x28
#define TWL4030_BCIMFKEY 0x11
#define TWL4030_BCIMFEN3 0x14
#define TWL4030_BCIMFTH8 0x1d
#define TWL4030_BCIMFTH9 0x1e
#define TWL4030_BCIWDKEY 0x21
#define TWL4030_BCIMFSTS1 0x01
#define TWL4030_BCIAUTOWEN BIT(5)
#define TWL4030_CONFIG_DONE BIT(4)
#define TWL4030_CVENAC BIT(2)
#define TWL4030_BCIAUTOUSB BIT(1)
#define TWL4030_BCIAUTOAC BIT(0)
#define TWL4030_CGAIN BIT(5)
#define TWL4030_USBFASTMCHG BIT(2)
#define TWL4030_STS_VBUS BIT(7)
#define TWL4030_STS_USB_ID BIT(2)
#define TWL4030_BBCHEN BIT(4)
#define TWL4030_BBSEL_MASK 0x0c
#define TWL4030_BBSEL_2V5 0x00
#define TWL4030_BBSEL_3V0 0x04
#define TWL4030_BBSEL_3V1 0x08
#define TWL4030_BBSEL_3V2 0x0c
#define TWL4030_BBISEL_MASK 0x03
#define TWL4030_BBISEL_25uA 0x00
#define TWL4030_BBISEL_150uA 0x01
#define TWL4030_BBISEL_500uA 0x02
#define TWL4030_BBISEL_1000uA 0x03
#define TWL4030_BATSTSPCHG BIT(2)
#define TWL4030_BATSTSMCHG BIT(6)
/* BCI interrupts */
#define TWL4030_WOVF BIT(0) /* Watchdog overflow */
#define TWL4030_TMOVF BIT(1) /* Timer overflow */
#define TWL4030_ICHGHIGH BIT(2) /* Battery charge current high */
#define TWL4030_ICHGLOW BIT(3) /* Battery cc. low / FSM state change */
#define TWL4030_ICHGEOC BIT(4) /* Battery current end-of-charge */
#define TWL4030_TBATOR2 BIT(5) /* Battery temperature out of range 2 */
#define TWL4030_TBATOR1 BIT(6) /* Battery temperature out of range 1 */
#define TWL4030_BATSTS BIT(7) /* Battery status */
#define TWL4030_VBATLVL BIT(0) /* VBAT level */
#define TWL4030_VBATOV BIT(1) /* VBAT overvoltage */
#define TWL4030_VBUSOV BIT(2) /* VBUS overvoltage */
#define TWL4030_ACCHGOV BIT(3) /* Ac charger overvoltage */
#define TWL4030_MSTATEC_USB BIT(4)
#define TWL4030_MSTATEC_AC BIT(5)
#define TWL4030_MSTATEC_MASK 0x0f
#define TWL4030_MSTATEC_QUICK1 0x02
#define TWL4030_MSTATEC_QUICK7 0x07
#define TWL4030_MSTATEC_COMPLETE1 0x0b
#define TWL4030_MSTATEC_COMPLETE4 0x0e
/*
* If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
* then AC is available.
*/
static inline int ac_available(struct iio_channel *channel_vac)
{
int val, err;
if (!channel_vac)
return 0;
err = iio_read_channel_processed(channel_vac, &val);
if (err < 0)
return 0;
return val > 4500;
}
static bool allow_usb;
module_param(allow_usb, bool, 0644);
MODULE_PARM_DESC(allow_usb, "Allow USB charge drawing default current");
struct twl4030_bci {
struct device *dev;
struct power_supply *ac;
struct power_supply *usb;
struct usb_phy *transceiver;
struct notifier_block usb_nb;
struct work_struct work;
int irq_chg;
int irq_bci;
int usb_enabled;
/*
* ichg_* and *_cur values in uA. If any are 'large', we set
* CGAIN to '1' which doubles the range for half the
* precision.
*/
unsigned int ichg_eoc, ichg_lo, ichg_hi;
unsigned int usb_cur, ac_cur;
struct iio_channel *channel_vac;
bool ac_is_active;
int usb_mode, ac_mode; /* charging mode requested */
#define CHARGE_OFF 0
#define CHARGE_AUTO 1
#define CHARGE_LINEAR 2
/* When setting the USB current we slowly increase the
* requested current until target is reached or the voltage
* drops below 4.75V. In the latter case we step back one
* step.
*/
unsigned int usb_cur_target;
struct delayed_work current_worker;
#define USB_CUR_STEP 20000 /* 20mA at a time */
#define USB_MIN_VOLT 4750000 /* 4.75V */
#define USB_CUR_DELAY msecs_to_jiffies(100)
#define USB_MAX_CURRENT 1700000 /* TWL4030 caps at 1.7A */
unsigned long event;
};
/* strings for 'usb_mode' values */
static char *modes[] = { "off", "auto", "continuous" };
/*
* clear and set bits on an given register on a given module
*/
static int twl4030_clear_set(u8 mod_no, u8 clear, u8 set, u8 reg)
{
u8 val = 0;
int ret;
ret = twl_i2c_read_u8(mod_no, &val, reg);
if (ret)
return ret;
val &= ~clear;
val |= set;
return twl_i2c_write_u8(mod_no, val, reg);
}
static int twl4030_bci_read(u8 reg, u8 *val)
{
return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
}
static int twl4030_clear_set_boot_bci(u8 clear, u8 set)
{
return twl4030_clear_set(TWL_MODULE_PM_MASTER, clear,
TWL4030_CONFIG_DONE | TWL4030_BCIAUTOWEN | set,
TWL4030_PM_MASTER_BOOT_BCI);
}
static int twl4030bci_read_adc_val(u8 reg)
{
int ret, temp;
u8 val;
/* read MSB */
ret = twl4030_bci_read(reg + 1, &val);
if (ret)
return ret;
temp = (int)(val & 0x03) << 8;
/* read LSB */
ret = twl4030_bci_read(reg, &val);
if (ret)
return ret;
return temp | val;
}
/*
* Check if Battery Pack was present
*/
static int twl4030_is_battery_present(struct twl4030_bci *bci)
{
int ret;
u8 val = 0;
/* Battery presence in Main charge? */
ret = twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, &val, TWL4030_BCIMFSTS3);
if (ret)
return ret;
if (val & TWL4030_BATSTSMCHG)
return 0;
/*
* OK, It could be that bootloader did not enable main charger,
* pre-charge is h/w auto. So, Battery presence in Pre-charge?
*/
ret = twl_i2c_read_u8(TWL4030_MODULE_PRECHARGE, &val,
TWL4030_BCIMFSTS1);
if (ret)
return ret;
if (val & TWL4030_BATSTSPCHG)
return 0;
return -ENODEV;
}
/*
* TI provided formulas:
* CGAIN == 0: ICHG = (BCIICHG * 1.7) / (2^10 - 1) - 0.85
* CGAIN == 1: ICHG = (BCIICHG * 3.4) / (2^10 - 1) - 1.7
* Here we use integer approximation of:
* CGAIN == 0: val * 1.6618 - 0.85 * 1000
* CGAIN == 1: (val * 1.6618 - 0.85 * 1000) * 2
*/
/*
* convert twl register value for currents into uA
*/
static int regval2ua(int regval, bool cgain)
{
if (cgain)
return (regval * 16618 - 8500 * 1000) / 5;
else
return (regval * 16618 - 8500 * 1000) / 10;
}
/*
* convert uA currents into twl register value
*/
static int ua2regval(int ua, bool cgain)
{
int ret;
if (cgain)
ua /= 2;
ret = (ua * 10 + 8500 * 1000) / 16618;
/* rounding problems */
if (ret < 512)
ret = 512;
return ret;
}
static int twl4030_charger_update_current(struct twl4030_bci *bci)
{
int status;
int cur;
unsigned reg, cur_reg;
u8 bcictl1, oldreg, fullreg;
bool cgain = false;
u8 boot_bci;
/*
* If AC (Accessory Charger) voltage exceeds 4.5V (MADC 11)
* and AC is enabled, set current for 'ac'
*/
if (ac_available(bci->channel_vac)) {
cur = bci->ac_cur;
bci->ac_is_active = true;
} else {
cur = bci->usb_cur;
bci->ac_is_active = false;
if (cur > bci->usb_cur_target) {
cur = bci->usb_cur_target;
bci->usb_cur = cur;
}
if (cur < bci->usb_cur_target)
schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
}
/* First, check thresholds and see if cgain is needed */
if (bci->ichg_eoc >= 200000)
cgain = true;
if (bci->ichg_lo >= 400000)
cgain = true;
if (bci->ichg_hi >= 820000)
cgain = true;
if (cur > 852000)
cgain = true;
status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
if (status < 0)
return status;
if (twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &boot_bci,
TWL4030_PM_MASTER_BOOT_BCI) < 0)
boot_bci = 0;
boot_bci &= 7;
if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN))
/* Need to turn for charging while we change the
* CGAIN bit. Leave it off while everything is
* updated.
*/
twl4030_clear_set_boot_bci(boot_bci, 0);
/*
* For ichg_eoc, the hardware only supports reg values matching
* 100XXXX000, and requires the XXXX be stored in the high nibble
* of TWL4030_BCIMFTH8.
*/
reg = ua2regval(bci->ichg_eoc, cgain);
if (reg > 0x278)
reg = 0x278;
if (reg < 0x200)
reg = 0x200;
reg = (reg >> 3) & 0xf;
fullreg = reg << 4;
/*
* For ichg_lo, reg value must match 10XXXX0000.
* XXXX is stored in low nibble of TWL4030_BCIMFTH8.
*/
reg = ua2regval(bci->ichg_lo, cgain);
if (reg > 0x2F0)
reg = 0x2F0;
if (reg < 0x200)
reg = 0x200;
reg = (reg >> 4) & 0xf;
fullreg |= reg;
/* ichg_eoc and ichg_lo live in same register */
status = twl4030_bci_read(TWL4030_BCIMFTH8, &oldreg);
if (status < 0)
return status;
if (oldreg != fullreg) {
status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xF4,
TWL4030_BCIMFKEY);
if (status < 0)
return status;
twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
fullreg, TWL4030_BCIMFTH8);
}
/* ichg_hi threshold must be 1XXXX01100 (I think) */
reg = ua2regval(bci->ichg_hi, cgain);
if (reg > 0x3E0)
reg = 0x3E0;
if (reg < 0x200)
reg = 0x200;
fullreg = (reg >> 5) & 0xF;
fullreg <<= 4;
status = twl4030_bci_read(TWL4030_BCIMFTH9, &oldreg);
if (status < 0)
return status;
if ((oldreg & 0xF0) != fullreg) {
fullreg |= (oldreg & 0x0F);
status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
TWL4030_BCIMFKEY);
if (status < 0)
return status;
twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
fullreg, TWL4030_BCIMFTH9);
}
/*
* And finally, set the current. This is stored in
* two registers.
*/
reg = ua2regval(cur, cgain);
/* we have only 10 bits */
if (reg > 0x3ff)
reg = 0x3ff;
status = twl4030_bci_read(TWL4030_BCIIREF1, &oldreg);
if (status < 0)
return status;
cur_reg = oldreg;
status = twl4030_bci_read(TWL4030_BCIIREF2, &oldreg);
if (status < 0)
return status;
cur_reg |= oldreg << 8;
if (reg != oldreg) {
/* disable write protection for one write access for
* BCIIREF */
status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
TWL4030_BCIMFKEY);
if (status < 0)
return status;
status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
(reg & 0x100) ? 3 : 2,
TWL4030_BCIIREF2);
if (status < 0)
return status;
/* disable write protection for one write access for
* BCIIREF */
status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xE7,
TWL4030_BCIMFKEY);
if (status < 0)
return status;
status = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
reg & 0xff,
TWL4030_BCIIREF1);
}
if ((!!cgain) != !!(bcictl1 & TWL4030_CGAIN)) {
/* Flip CGAIN and re-enable charging */
bcictl1 ^= TWL4030_CGAIN;
twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE,
bcictl1, TWL4030_BCICTL1);
twl4030_clear_set_boot_bci(0, boot_bci);
}
return 0;
}
static int twl4030_charger_get_current(void);
static void twl4030_current_worker(struct work_struct *data)
{
int v, curr;
int res;
struct twl4030_bci *bci = container_of(data, struct twl4030_bci,
current_worker.work);
res = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
if (res < 0)
v = 0;
else
/* BCIVBUS uses ADCIN8, 7/1023 V/step */
v = res * 6843;
curr = twl4030_charger_get_current();
dev_dbg(bci->dev, "v=%d cur=%d limit=%d target=%d\n", v, curr,
bci->usb_cur, bci->usb_cur_target);
if (v < USB_MIN_VOLT) {
/* Back up and stop adjusting. */
bci->usb_cur -= USB_CUR_STEP;
bci->usb_cur_target = bci->usb_cur;
} else if (bci->usb_cur >= bci->usb_cur_target ||
bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
/* Reached target and voltage is OK - stop */
return;
} else {
bci->usb_cur += USB_CUR_STEP;
schedule_delayed_work(&bci->current_worker, USB_CUR_DELAY);
}
twl4030_charger_update_current(bci);
}
/*
* Enable/Disable USB Charge functionality.
*/
static int twl4030_charger_enable_usb(struct twl4030_bci *bci, bool enable)
{
int ret;
if (bci->usb_mode == CHARGE_OFF)
enable = false;
if (enable && !IS_ERR_OR_NULL(bci->transceiver)) {
twl4030_charger_update_current(bci);
/* Need to keep phy powered */
if (!bci->usb_enabled) {
pm_runtime_get_sync(bci->transceiver->dev);
bci->usb_enabled = 1;
}
if (bci->usb_mode == CHARGE_AUTO)
/* forcing the field BCIAUTOUSB (BOOT_BCI[1]) to 1 */
ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOUSB);
/* forcing USBFASTMCHG(BCIMFSTS4[2]) to 1 */
ret = twl4030_clear_set(TWL_MODULE_MAIN_CHARGE, 0,
TWL4030_USBFASTMCHG, TWL4030_BCIMFSTS4);
if (bci->usb_mode == CHARGE_LINEAR) {
twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC|TWL4030_CVENAC, 0);
/* Watch dog key: WOVF acknowledge */
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x33,
TWL4030_BCIWDKEY);
/* 0x24 + EKEY6: off mode */
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
TWL4030_BCIMDKEY);
/* EKEY2: Linear charge: USB path */
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x26,
TWL4030_BCIMDKEY);
/* WDKEY5: stop watchdog count */
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf3,
TWL4030_BCIWDKEY);
/* enable MFEN3 access */
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x9c,
TWL4030_BCIMFKEY);
/* ICHGEOCEN - end-of-charge monitor (current < 80mA)
* (charging continues)
* ICHGLOWEN - current level monitor (charge continues)
* don't monitor over-current or heat save
*/
ret = twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0xf0,
TWL4030_BCIMFEN3);
}
} else {
ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOUSB, 0);
ret |= twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, 0x2a,
TWL4030_BCIMDKEY);
if (bci->usb_enabled) {
pm_runtime_mark_last_busy(bci->transceiver->dev);
pm_runtime_put_autosuspend(bci->transceiver->dev);
bci->usb_enabled = 0;
}
bci->usb_cur = 0;
}
return ret;
}
/*
* Enable/Disable AC Charge funtionality.
*/
static int twl4030_charger_enable_ac(struct twl4030_bci *bci, bool enable)
{
int ret;
if (bci->ac_mode == CHARGE_OFF)
enable = false;
if (enable)
ret = twl4030_clear_set_boot_bci(0, TWL4030_BCIAUTOAC);
else
ret = twl4030_clear_set_boot_bci(TWL4030_BCIAUTOAC, 0);
return ret;
}
/*
* Enable/Disable charging of Backup Battery.
*/
static int twl4030_charger_enable_backup(int uvolt, int uamp)
{
int ret;
u8 flags;
if (uvolt < 2500000 ||
uamp < 25) {
/* disable charging of backup battery */
ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
TWL4030_BBCHEN, 0, TWL4030_BB_CFG);
return ret;
}
flags = TWL4030_BBCHEN;
if (uvolt >= 3200000)
flags |= TWL4030_BBSEL_3V2;
else if (uvolt >= 3100000)
flags |= TWL4030_BBSEL_3V1;
else if (uvolt >= 3000000)
flags |= TWL4030_BBSEL_3V0;
else
flags |= TWL4030_BBSEL_2V5;
if (uamp >= 1000)
flags |= TWL4030_BBISEL_1000uA;
else if (uamp >= 500)
flags |= TWL4030_BBISEL_500uA;
else if (uamp >= 150)
flags |= TWL4030_BBISEL_150uA;
else
flags |= TWL4030_BBISEL_25uA;
ret = twl4030_clear_set(TWL_MODULE_PM_RECEIVER,
TWL4030_BBSEL_MASK | TWL4030_BBISEL_MASK,
flags,
TWL4030_BB_CFG);
return ret;
}
/*
* TWL4030 CHG_PRES (AC charger presence) events
*/
static irqreturn_t twl4030_charger_interrupt(int irq, void *arg)
{
struct twl4030_bci *bci = arg;
dev_dbg(bci->dev, "CHG_PRES irq\n");
/* reset current on each 'plug' event */
bci->ac_cur = 500000;
twl4030_charger_update_current(bci);
power_supply_changed(bci->ac);
power_supply_changed(bci->usb);
return IRQ_HANDLED;
}
/*
* TWL4030 BCI monitoring events
*/
static irqreturn_t twl4030_bci_interrupt(int irq, void *arg)
{
struct twl4030_bci *bci = arg;
u8 irqs1, irqs2;
int ret;
ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs1,
TWL4030_INTERRUPTS_BCIISR1A);
if (ret < 0)
return IRQ_HANDLED;
ret = twl_i2c_read_u8(TWL4030_MODULE_INTERRUPTS, &irqs2,
TWL4030_INTERRUPTS_BCIISR2A);
if (ret < 0)
return IRQ_HANDLED;
dev_dbg(bci->dev, "BCI irq %02x %02x\n", irqs2, irqs1);
if (irqs1 & (TWL4030_ICHGLOW | TWL4030_ICHGEOC)) {
/* charger state change, inform the core */
power_supply_changed(bci->ac);
power_supply_changed(bci->usb);
}
twl4030_charger_update_current(bci);
/* various monitoring events, for now we just log them here */
if (irqs1 & (TWL4030_TBATOR2 | TWL4030_TBATOR1))
dev_warn(bci->dev, "battery temperature out of range\n");
if (irqs1 & TWL4030_BATSTS)
dev_crit(bci->dev, "battery disconnected\n");
if (irqs2 & TWL4030_VBATOV)
dev_crit(bci->dev, "VBAT overvoltage\n");
if (irqs2 & TWL4030_VBUSOV)
dev_crit(bci->dev, "VBUS overvoltage\n");
if (irqs2 & TWL4030_ACCHGOV)
dev_crit(bci->dev, "Ac charger overvoltage\n");
return IRQ_HANDLED;
}
/*
* Provide "max_current" attribute in sysfs.
*/
static ssize_t
twl4030_bci_max_current_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int cur = 0;
int status = 0;
status = kstrtoint(buf, 10, &cur);
if (status)
return status;
if (cur < 0)
return -EINVAL;
if (dev == &bci->ac->dev)
bci->ac_cur = cur;
else
bci->usb_cur_target = cur;
twl4030_charger_update_current(bci);
return n;
}
/*
* sysfs max_current show
*/
static ssize_t twl4030_bci_max_current_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int status = 0;
int cur = -1;
u8 bcictl1;
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
if (dev == &bci->ac->dev) {
if (!bci->ac_is_active)
cur = bci->ac_cur;
} else {
if (bci->ac_is_active)
cur = bci->usb_cur_target;
}
if (cur < 0) {
cur = twl4030bci_read_adc_val(TWL4030_BCIIREF1);
if (cur < 0)
return cur;
status = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
if (status < 0)
return status;
cur = regval2ua(cur, bcictl1 & TWL4030_CGAIN);
}
return scnprintf(buf, PAGE_SIZE, "%u\n", cur);
}
static DEVICE_ATTR(max_current, 0644, twl4030_bci_max_current_show,
twl4030_bci_max_current_store);
static void twl4030_bci_usb_work(struct work_struct *data)
{
struct twl4030_bci *bci = container_of(data, struct twl4030_bci, work);
switch (bci->event) {
case USB_EVENT_VBUS:
case USB_EVENT_CHARGER:
twl4030_charger_enable_usb(bci, true);
break;
case USB_EVENT_NONE:
twl4030_charger_enable_usb(bci, false);
break;
}
}
static int twl4030_bci_usb_ncb(struct notifier_block *nb, unsigned long val,
void *priv)
{
struct twl4030_bci *bci = container_of(nb, struct twl4030_bci, usb_nb);
dev_dbg(bci->dev, "OTG notify %lu\n", val);
/* reset current on each 'plug' event */
if (allow_usb)
bci->usb_cur_target = 500000;
else
bci->usb_cur_target = 100000;
bci->event = val;
schedule_work(&bci->work);
return NOTIFY_OK;
}
/*
* sysfs charger enabled store
*/
static ssize_t
twl4030_bci_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t n)
{
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int mode;
int status;
if (sysfs_streq(buf, modes[0]))
mode = 0;
else if (sysfs_streq(buf, modes[1]))
mode = 1;
else if (sysfs_streq(buf, modes[2]))
mode = 2;
else
return -EINVAL;
if (dev == &bci->ac->dev) {
if (mode == 2)
return -EINVAL;
twl4030_charger_enable_ac(bci, false);
bci->ac_mode = mode;
status = twl4030_charger_enable_ac(bci, true);
} else {
twl4030_charger_enable_usb(bci, false);
bci->usb_mode = mode;
status = twl4030_charger_enable_usb(bci, true);
}
return (status == 0) ? n : status;
}
/*
* sysfs charger enabled show
*/
static ssize_t
twl4030_bci_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct twl4030_bci *bci = dev_get_drvdata(dev->parent);
int len = 0;
int i;
int mode = bci->usb_mode;
if (dev == &bci->ac->dev)
mode = bci->ac_mode;
for (i = 0; i < ARRAY_SIZE(modes); i++)
if (mode == i)
len += snprintf(buf+len, PAGE_SIZE-len,
"[%s] ", modes[i]);
else
len += snprintf(buf+len, PAGE_SIZE-len,
"%s ", modes[i]);
buf[len-1] = '\n';
return len;
}
static DEVICE_ATTR(mode, 0644, twl4030_bci_mode_show,
twl4030_bci_mode_store);
static int twl4030_charger_get_current(void)
{
int curr;
int ret;
u8 bcictl1;
curr = twl4030bci_read_adc_val(TWL4030_BCIICHG);
if (curr < 0)
return curr;
ret = twl4030_bci_read(TWL4030_BCICTL1, &bcictl1);
if (ret)
return ret;
return regval2ua(curr, bcictl1 & TWL4030_CGAIN);
}
/*
* Returns the main charge FSM state
* Or < 0 on failure.
*/
static int twl4030bci_state(struct twl4030_bci *bci)
{
int ret;
u8 state;
ret = twl4030_bci_read(TWL4030_BCIMSTATEC, &state);
if (ret) {
pr_err("twl4030_bci: error reading BCIMSTATEC\n");
return ret;
}
dev_dbg(bci->dev, "state: %02x\n", state);
return state;
}
static int twl4030_bci_state_to_status(int state)
{
state &= TWL4030_MSTATEC_MASK;
if (TWL4030_MSTATEC_QUICK1 <= state && state <= TWL4030_MSTATEC_QUICK7)
return POWER_SUPPLY_STATUS_CHARGING;
else if (TWL4030_MSTATEC_COMPLETE1 <= state &&
state <= TWL4030_MSTATEC_COMPLETE4)
return POWER_SUPPLY_STATUS_FULL;
else
return POWER_SUPPLY_STATUS_NOT_CHARGING;
}
static int twl4030_bci_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct twl4030_bci *bci = dev_get_drvdata(psy->dev.parent);
int is_charging;
int state;
int ret;
state = twl4030bci_state(bci);
if (state < 0)
return state;
if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
is_charging = state & TWL4030_MSTATEC_USB;
else
is_charging = state & TWL4030_MSTATEC_AC;
if (!is_charging) {
u8 s;
twl4030_bci_read(TWL4030_BCIMDEN, &s);
if (psy->desc->type == POWER_SUPPLY_TYPE_USB)
is_charging = s & 1;
else
is_charging = s & 2;
if (is_charging)
/* A little white lie */
state = TWL4030_MSTATEC_QUICK1;
}
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
if (is_charging)
val->intval = twl4030_bci_state_to_status(state);
else
val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
/* charging must be active for meaningful result */
if (!is_charging)
return -ENODATA;
if (psy->desc->type == POWER_SUPPLY_TYPE_USB) {
ret = twl4030bci_read_adc_val(TWL4030_BCIVBUS);
if (ret < 0)
return ret;
/* BCIVBUS uses ADCIN8, 7/1023 V/step */
val->intval = ret * 6843;
} else {
ret = twl4030bci_read_adc_val(TWL4030_BCIVAC);
if (ret < 0)
return ret;
/* BCIVAC uses ADCIN11, 10/1023 V/step */
val->intval = ret * 9775;
}
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
if (!is_charging)
return -ENODATA;
/* current measurement is shared between AC and USB */
ret = twl4030_charger_get_current();
if (ret < 0)
return ret;
val->intval = ret;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = is_charging &&
twl4030_bci_state_to_status(state) !=
POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
default:
return -EINVAL;
}
return 0;
}
static enum power_supply_property twl4030_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
#ifdef CONFIG_OF
static const struct twl4030_bci_platform_data *
twl4030_bci_parse_dt(struct device *dev)
{
struct device_node *np = dev->of_node;
struct twl4030_bci_platform_data *pdata;
u32 num;
if (!np)
return NULL;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return pdata;
if (of_property_read_u32(np, "ti,bb-uvolt", &num) == 0)
pdata->bb_uvolt = num;
if (of_property_read_u32(np, "ti,bb-uamp", &num) == 0)
pdata->bb_uamp = num;
return pdata;
}
#else
static inline const struct twl4030_bci_platform_data *
twl4030_bci_parse_dt(struct device *dev)
{
return NULL;
}
#endif
static const struct power_supply_desc twl4030_bci_ac_desc = {
.name = "twl4030_ac",
.type = POWER_SUPPLY_TYPE_MAINS,
.properties = twl4030_charger_props,
.num_properties = ARRAY_SIZE(twl4030_charger_props),
.get_property = twl4030_bci_get_property,
};
static const struct power_supply_desc twl4030_bci_usb_desc = {
.name = "twl4030_usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = twl4030_charger_props,
.num_properties = ARRAY_SIZE(twl4030_charger_props),
.get_property = twl4030_bci_get_property,
};
static int twl4030_bci_probe(struct platform_device *pdev)
{
struct twl4030_bci *bci;
const struct twl4030_bci_platform_data *pdata = pdev->dev.platform_data;
int ret;
u32 reg;
bci = devm_kzalloc(&pdev->dev, sizeof(*bci), GFP_KERNEL);
if (bci == NULL)
return -ENOMEM;
if (!pdata)
pdata = twl4030_bci_parse_dt(&pdev->dev);
bci->ichg_eoc = 80100; /* Stop charging when current drops to here */
bci->ichg_lo = 241000; /* Low threshold */
bci->ichg_hi = 500000; /* High threshold */
bci->ac_cur = 500000; /* 500mA */
if (allow_usb)
bci->usb_cur_target = 500000; /* 500mA */
else
bci->usb_cur_target = 100000; /* 100mA */
bci->usb_mode = CHARGE_AUTO;
bci->ac_mode = CHARGE_AUTO;
bci->dev = &pdev->dev;
bci->irq_chg = platform_get_irq(pdev, 0);
bci->irq_bci = platform_get_irq(pdev, 1);
/* Only proceed further *IF* battery is physically present */
ret = twl4030_is_battery_present(bci);
if (ret) {
dev_crit(&pdev->dev, "Battery was not detected:%d\n", ret);
return ret;
}
platform_set_drvdata(pdev, bci);
bci->ac = devm_power_supply_register(&pdev->dev, &twl4030_bci_ac_desc,
NULL);
if (IS_ERR(bci->ac)) {
ret = PTR_ERR(bci->ac);
dev_err(&pdev->dev, "failed to register ac: %d\n", ret);
return ret;
}
bci->usb = devm_power_supply_register(&pdev->dev, &twl4030_bci_usb_desc,
NULL);
if (IS_ERR(bci->usb)) {
ret = PTR_ERR(bci->usb);
dev_err(&pdev->dev, "failed to register usb: %d\n", ret);
return ret;
}
ret = devm_request_threaded_irq(&pdev->dev, bci->irq_chg, NULL,
twl4030_charger_interrupt, IRQF_ONESHOT, pdev->name,
bci);
if (ret < 0) {
dev_err(&pdev->dev, "could not request irq %d, status %d\n",
bci->irq_chg, ret);
return ret;
}
ret = devm_request_threaded_irq(&pdev->dev, bci->irq_bci, NULL,
twl4030_bci_interrupt, IRQF_ONESHOT, pdev->name, bci);
if (ret < 0) {
dev_err(&pdev->dev, "could not request irq %d, status %d\n",
bci->irq_bci, ret);
return ret;
}
bci->channel_vac = iio_channel_get(&pdev->dev, "vac");
if (IS_ERR(bci->channel_vac)) {
bci->channel_vac = NULL;
dev_warn(&pdev->dev, "could not request vac iio channel");
}
INIT_WORK(&bci->work, twl4030_bci_usb_work);
INIT_DELAYED_WORK(&bci->current_worker, twl4030_current_worker);
bci->usb_nb.notifier_call = twl4030_bci_usb_ncb;
if (bci->dev->of_node) {
struct device_node *phynode;
phynode = of_find_compatible_node(bci->dev->of_node->parent,
NULL, "ti,twl4030-usb");
if (phynode)
bci->transceiver = devm_usb_get_phy_by_node(
bci->dev, phynode, &bci->usb_nb);
}
/* Enable interrupts now. */
reg = ~(u32)(TWL4030_ICHGLOW | TWL4030_ICHGEOC | TWL4030_TBATOR2 |
TWL4030_TBATOR1 | TWL4030_BATSTS);
ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
TWL4030_INTERRUPTS_BCIIMR1A);
if (ret < 0) {
dev_err(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
goto fail;
}
reg = ~(u32)(TWL4030_VBATOV | TWL4030_VBUSOV | TWL4030_ACCHGOV);
ret = twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, reg,
TWL4030_INTERRUPTS_BCIIMR2A);
if (ret < 0)
dev_warn(&pdev->dev, "failed to unmask interrupts: %d\n", ret);
twl4030_charger_update_current(bci);
if (device_create_file(&bci->usb->dev, &dev_attr_max_current))
dev_warn(&pdev->dev, "could not create sysfs file\n");
if (device_create_file(&bci->usb->dev, &dev_attr_mode))
dev_warn(&pdev->dev, "could not create sysfs file\n");
if (device_create_file(&bci->ac->dev, &dev_attr_mode))
dev_warn(&pdev->dev, "could not create sysfs file\n");
if (device_create_file(&bci->ac->dev, &dev_attr_max_current))
dev_warn(&pdev->dev, "could not create sysfs file\n");
twl4030_charger_enable_ac(bci, true);
if (!IS_ERR_OR_NULL(bci->transceiver))
twl4030_bci_usb_ncb(&bci->usb_nb,
bci->transceiver->last_event,
NULL);
else
twl4030_charger_enable_usb(bci, false);
if (pdata)
twl4030_charger_enable_backup(pdata->bb_uvolt,
pdata->bb_uamp);
else
twl4030_charger_enable_backup(0, 0);
return 0;
fail:
iio_channel_release(bci->channel_vac);
return ret;
}
static int __exit twl4030_bci_remove(struct platform_device *pdev)
{
struct twl4030_bci *bci = platform_get_drvdata(pdev);
twl4030_charger_enable_ac(bci, false);
twl4030_charger_enable_usb(bci, false);
twl4030_charger_enable_backup(0, 0);
iio_channel_release(bci->channel_vac);
device_remove_file(&bci->usb->dev, &dev_attr_max_current);
device_remove_file(&bci->usb->dev, &dev_attr_mode);
device_remove_file(&bci->ac->dev, &dev_attr_max_current);
device_remove_file(&bci->ac->dev, &dev_attr_mode);
/* mask interrupts */
twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
TWL4030_INTERRUPTS_BCIIMR1A);
twl_i2c_write_u8(TWL4030_MODULE_INTERRUPTS, 0xff,
TWL4030_INTERRUPTS_BCIIMR2A);
return 0;
}
static const struct of_device_id twl_bci_of_match[] = {
{.compatible = "ti,twl4030-bci", },
{ }
};
MODULE_DEVICE_TABLE(of, twl_bci_of_match);
static struct platform_driver twl4030_bci_driver = {
.probe = twl4030_bci_probe,
.driver = {
.name = "twl4030_bci",
.of_match_table = of_match_ptr(twl_bci_of_match),
},
.remove = __exit_p(twl4030_bci_remove),
};
module_platform_driver(twl4030_bci_driver);
MODULE_AUTHOR("Gražvydas Ignotas");
MODULE_DESCRIPTION("TWL4030 Battery Charger Interface driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:twl4030_bci");
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