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linux-stable/drivers/mfd/tps65010.c
Jinjie Ruan 2174f9a8c9 mfd: tps65010: Use IRQF_NO_AUTOEN flag in request_irq() to fix race 
As the comment said, disable_irq() after request_irq() still has a
time gap in which interrupts can come. request_irq() with IRQF_NO_AUTOEN
flag will disable IRQ auto-enable when request IRQ.

Fixes: 72cd799544 ("[PATCH] I2C: add i2c driver for TPS6501x")
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://lore.kernel.org/r/20240912031530.2211654-1-ruanjinjie@huawei.com
Signed-off-by: Lee Jones <lee@kernel.org>
2024-10-16 09:04:09 +01:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* tps65010 - driver for tps6501x power management chips
*
* Copyright (C) 2004 Texas Instruments
* Copyright (C) 2004-2005 David Brownell
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/mfd/tps65010.h>
#include <linux/gpio/driver.h>
/*-------------------------------------------------------------------------*/
#define DRIVER_VERSION "2 May 2005"
#define DRIVER_NAME (tps65010_driver.driver.name)
MODULE_DESCRIPTION("TPS6501x Power Management Driver");
MODULE_LICENSE("GPL");
static struct i2c_driver tps65010_driver;
/*-------------------------------------------------------------------------*/
/* This driver handles a family of multipurpose chips, which incorporate
* voltage regulators, lithium ion/polymer battery charging, GPIOs, LEDs,
* and other features often needed in portable devices like cell phones
* or digital cameras.
*
* The tps65011 and tps65013 have different voltage settings compared
* to tps65010 and tps65012. The tps65013 has a NO_CHG status/irq.
* All except tps65010 have "wait" mode, possibly defaulted so that
* battery-insert != device-on.
*
* We could distinguish between some models by checking VDCDC1.UVLO or
* other registers, unless they've been changed already after powerup
* as part of board setup by a bootloader.
*/
enum tps_model {
TPS65010,
TPS65011,
TPS65012,
TPS65013,
};
struct tps65010 {
struct i2c_client *client;
struct mutex lock;
struct delayed_work work;
struct dentry *file;
unsigned charging:1;
unsigned por:1;
unsigned model:8;
u16 vbus;
unsigned long flags;
#define FLAG_VBUS_CHANGED 0
#define FLAG_IRQ_ENABLE 1
/* copies of last register state */
u8 chgstatus, regstatus, chgconf;
u8 nmask1, nmask2;
u8 outmask;
struct gpio_chip chip;
struct platform_device *leds;
};
#define POWER_POLL_DELAY msecs_to_jiffies(5000)
/*-------------------------------------------------------------------------*/
#if defined(DEBUG) || defined(CONFIG_DEBUG_FS)
static void dbg_chgstat(char *buf, size_t len, u8 chgstatus)
{
snprintf(buf, len, "%02x%s%s%s%s%s%s%s%s\n",
chgstatus,
(chgstatus & TPS_CHG_USB) ? " USB" : "",
(chgstatus & TPS_CHG_AC) ? " AC" : "",
(chgstatus & TPS_CHG_THERM) ? " therm" : "",
(chgstatus & TPS_CHG_TERM) ? " done" :
((chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
? " (charging)" : ""),
(chgstatus & TPS_CHG_TAPER_TMO) ? " taper_tmo" : "",
(chgstatus & TPS_CHG_CHG_TMO) ? " charge_tmo" : "",
(chgstatus & TPS_CHG_PRECHG_TMO) ? " prechg_tmo" : "",
(chgstatus & TPS_CHG_TEMP_ERR) ? " temp_err" : "");
}
static void dbg_regstat(char *buf, size_t len, u8 regstatus)
{
snprintf(buf, len, "%02x %s%s%s%s%s%s%s%s\n",
regstatus,
(regstatus & TPS_REG_ONOFF) ? "off" : "(on)",
(regstatus & TPS_REG_COVER) ? " uncover" : "",
(regstatus & TPS_REG_UVLO) ? " UVLO" : "",
(regstatus & TPS_REG_NO_CHG) ? " NO_CHG" : "",
(regstatus & TPS_REG_PG_LD02) ? " ld02_bad" : "",
(regstatus & TPS_REG_PG_LD01) ? " ld01_bad" : "",
(regstatus & TPS_REG_PG_MAIN) ? " main_bad" : "",
(regstatus & TPS_REG_PG_CORE) ? " core_bad" : "");
}
static void dbg_chgconf(int por, char *buf, size_t len, u8 chgconfig)
{
const char *hibit;
if (por)
hibit = (chgconfig & TPS_CHARGE_POR)
? "POR=69ms" : "POR=1sec";
else
hibit = (chgconfig & TPS65013_AUA) ? "AUA" : "";
snprintf(buf, len, "%02x %s%s%s AC=%d%% USB=%dmA %sCharge\n",
chgconfig, hibit,
(chgconfig & TPS_CHARGE_RESET) ? " reset" : "",
(chgconfig & TPS_CHARGE_FAST) ? " fast" : "",
({int p; switch ((chgconfig >> 3) & 3) {
case 3: p = 100; break;
case 2: p = 75; break;
case 1: p = 50; break;
default: p = 25; break;
}; p; }),
(chgconfig & TPS_VBUS_CHARGING)
? ((chgconfig & TPS_VBUS_500MA) ? 500 : 100)
: 0,
(chgconfig & TPS_CHARGE_ENABLE) ? "" : "No");
}
#endif
#ifdef DEBUG
static void show_chgstatus(const char *label, u8 chgstatus)
{
char buf [100];
dbg_chgstat(buf, sizeof buf, chgstatus);
pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
}
static void show_regstatus(const char *label, u8 regstatus)
{
char buf [100];
dbg_regstat(buf, sizeof buf, regstatus);
pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
}
static void show_chgconfig(int por, const char *label, u8 chgconfig)
{
char buf [100];
dbg_chgconf(por, buf, sizeof buf, chgconfig);
pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
}
#else
static inline void show_chgstatus(const char *label, u8 chgstatus) { }
static inline void show_regstatus(const char *label, u8 chgstatus) { }
static inline void show_chgconfig(int por, const char *label, u8 chgconfig) { }
#endif
#ifdef CONFIG_DEBUG_FS
static int dbg_show(struct seq_file *s, void *_)
{
struct tps65010 *tps = s->private;
u8 value, v2;
unsigned i;
char buf[100];
const char *chip;
switch (tps->model) {
case TPS65010: chip = "tps65010"; break;
case TPS65011: chip = "tps65011"; break;
case TPS65012: chip = "tps65012"; break;
case TPS65013: chip = "tps65013"; break;
default: chip = NULL; break;
}
seq_printf(s, "driver %s\nversion %s\nchip %s\n\n",
DRIVER_NAME, DRIVER_VERSION, chip);
mutex_lock(&tps->lock);
/* FIXME how can we tell whether a battery is present?
* likely involves a charge gauging chip (like BQ26501).
*/
seq_printf(s, "%scharging\n\n", tps->charging ? "" : "(not) ");
/* registers for monitoring battery charging and status; note
* that reading chgstat and regstat may ack IRQs...
*/
value = i2c_smbus_read_byte_data(tps->client, TPS_CHGCONFIG);
dbg_chgconf(tps->por, buf, sizeof buf, value);
seq_printf(s, "chgconfig %s", buf);
value = i2c_smbus_read_byte_data(tps->client, TPS_CHGSTATUS);
dbg_chgstat(buf, sizeof buf, value);
seq_printf(s, "chgstat %s", buf);
value = i2c_smbus_read_byte_data(tps->client, TPS_MASK1);
dbg_chgstat(buf, sizeof buf, value);
seq_printf(s, "mask1 %s", buf);
/* ignore ackint1 */
value = i2c_smbus_read_byte_data(tps->client, TPS_REGSTATUS);
dbg_regstat(buf, sizeof buf, value);
seq_printf(s, "regstat %s", buf);
value = i2c_smbus_read_byte_data(tps->client, TPS_MASK2);
dbg_regstat(buf, sizeof buf, value);
seq_printf(s, "mask2 %s\n", buf);
/* ignore ackint2 */
queue_delayed_work(system_power_efficient_wq, &tps->work,
POWER_POLL_DELAY);
/* VMAIN voltage, enable lowpower, etc */
value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC1);
seq_printf(s, "vdcdc1 %02x\n", value);
/* VCORE voltage, vibrator on/off */
value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC2);
seq_printf(s, "vdcdc2 %02x\n", value);
/* both LD0s, and their lowpower behavior */
value = i2c_smbus_read_byte_data(tps->client, TPS_VREGS1);
seq_printf(s, "vregs1 %02x\n\n", value);
/* LEDs and GPIOs */
value = i2c_smbus_read_byte_data(tps->client, TPS_LED1_ON);
v2 = i2c_smbus_read_byte_data(tps->client, TPS_LED1_PER);
seq_printf(s, "led1 %s, on=%02x, per=%02x, %d/%d msec\n",
(value & 0x80)
? ((v2 & 0x80) ? "on" : "off")
: ((v2 & 0x80) ? "blink" : "(nPG)"),
value, v2,
(value & 0x7f) * 10, (v2 & 0x7f) * 100);
value = i2c_smbus_read_byte_data(tps->client, TPS_LED2_ON);
v2 = i2c_smbus_read_byte_data(tps->client, TPS_LED2_PER);
seq_printf(s, "led2 %s, on=%02x, per=%02x, %d/%d msec\n",
(value & 0x80)
? ((v2 & 0x80) ? "on" : "off")
: ((v2 & 0x80) ? "blink" : "off"),
value, v2,
(value & 0x7f) * 10, (v2 & 0x7f) * 100);
value = i2c_smbus_read_byte_data(tps->client, TPS_DEFGPIO);
v2 = i2c_smbus_read_byte_data(tps->client, TPS_MASK3);
seq_printf(s, "defgpio %02x mask3 %02x\n", value, v2);
for (i = 0; i < 4; i++) {
if (value & (1 << (4 + i)))
seq_printf(s, " gpio%d-out %s\n", i + 1,
(value & (1 << i)) ? "low" : "hi ");
else
seq_printf(s, " gpio%d-in %s %s %s\n", i + 1,
(value & (1 << i)) ? "hi " : "low",
(v2 & (1 << i)) ? "no-irq" : "irq",
(v2 & (1 << (4 + i))) ? "rising" : "falling");
}
mutex_unlock(&tps->lock);
return 0;
}
static int dbg_tps_open(struct inode *inode, struct file *file)
{
return single_open(file, dbg_show, inode->i_private);
}
static const struct file_operations debug_fops = {
.open = dbg_tps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#define DEBUG_FOPS &debug_fops
#else
#define DEBUG_FOPS NULL
#endif
/*-------------------------------------------------------------------------*/
/* handle IRQS in a task context, so we can use I2C calls */
static void tps65010_interrupt(struct tps65010 *tps)
{
u8 tmp = 0, mask, poll;
/* IRQs won't trigger for certain events, but we can get
* others by polling (normally, with external power applied).
*/
poll = 0;
/* regstatus irqs */
if (tps->nmask2) {
tmp = i2c_smbus_read_byte_data(tps->client, TPS_REGSTATUS);
mask = tmp ^ tps->regstatus;
tps->regstatus = tmp;
mask &= tps->nmask2;
} else
mask = 0;
if (mask) {
tps->regstatus = tmp;
/* may need to shut something down ... */
/* "off" usually means deep sleep */
if (tmp & TPS_REG_ONOFF) {
pr_info("%s: power off button\n", DRIVER_NAME);
#if 0
/* REVISIT: this might need its own workqueue
* plus tweaks including deadlock avoidance ...
* also needs to get error handling and probably
* an #ifdef CONFIG_HIBERNATION
*/
hibernate();
#endif
poll = 1;
}
}
/* chgstatus irqs */
if (tps->nmask1) {
tmp = i2c_smbus_read_byte_data(tps->client, TPS_CHGSTATUS);
mask = tmp ^ tps->chgstatus;
tps->chgstatus = tmp;
mask &= tps->nmask1;
} else
mask = 0;
if (mask) {
unsigned charging = 0;
show_chgstatus("chg/irq", tmp);
if (tmp & (TPS_CHG_USB|TPS_CHG_AC))
show_chgconfig(tps->por, "conf", tps->chgconf);
/* Unless it was turned off or disabled, we charge any
* battery whenever there's power available for it
* and the charger hasn't been disabled.
*/
if (!(tps->chgstatus & ~(TPS_CHG_USB|TPS_CHG_AC))
&& (tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
&& (tps->chgconf & TPS_CHARGE_ENABLE)
) {
if (tps->chgstatus & TPS_CHG_USB) {
/* VBUS options are readonly until reconnect */
if (mask & TPS_CHG_USB)
set_bit(FLAG_VBUS_CHANGED, &tps->flags);
charging = 1;
} else if (tps->chgstatus & TPS_CHG_AC)
charging = 1;
}
if (charging != tps->charging) {
tps->charging = charging;
pr_info("%s: battery %scharging\n",
DRIVER_NAME, charging ? "" :
((tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
? "NOT " : "dis"));
}
}
/* always poll to detect (a) power removal, without tps65013
* NO_CHG IRQ; or (b) restart of charging after stop.
*/
if ((tps->model != TPS65013 || !tps->charging)
&& (tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC)))
poll = 1;
if (poll)
queue_delayed_work(system_power_efficient_wq, &tps->work,
POWER_POLL_DELAY);
/* also potentially gpio-in rise or fall */
}
/* handle IRQs and polling using keventd for now */
static void tps65010_work(struct work_struct *work)
{
struct tps65010 *tps;
tps = container_of(to_delayed_work(work), struct tps65010, work);
mutex_lock(&tps->lock);
tps65010_interrupt(tps);
if (test_and_clear_bit(FLAG_VBUS_CHANGED, &tps->flags)) {
u8 chgconfig, tmp;
chgconfig = i2c_smbus_read_byte_data(tps->client,
TPS_CHGCONFIG);
chgconfig &= ~(TPS_VBUS_500MA | TPS_VBUS_CHARGING);
if (tps->vbus == 500)
chgconfig |= TPS_VBUS_500MA | TPS_VBUS_CHARGING;
else if (tps->vbus >= 100)
chgconfig |= TPS_VBUS_CHARGING;
i2c_smbus_write_byte_data(tps->client,
TPS_CHGCONFIG, chgconfig);
/* vbus update fails unless VBUS is connected! */
tmp = i2c_smbus_read_byte_data(tps->client, TPS_CHGCONFIG);
tps->chgconf = tmp;
show_chgconfig(tps->por, "update vbus", tmp);
}
if (test_and_clear_bit(FLAG_IRQ_ENABLE, &tps->flags))
enable_irq(tps->client->irq);
mutex_unlock(&tps->lock);
}
static irqreturn_t tps65010_irq(int irq, void *_tps)
{
struct tps65010 *tps = _tps;
disable_irq_nosync(irq);
set_bit(FLAG_IRQ_ENABLE, &tps->flags);
queue_delayed_work(system_power_efficient_wq, &tps->work, 0);
return IRQ_HANDLED;
}
/*-------------------------------------------------------------------------*/
/* offsets 0..3 == GPIO1..GPIO4
* offsets 4..5 == LED1/nPG, LED2 (we set one of the non-BLINK modes)
* offset 6 == vibrator motor driver
*/
static void
tps65010_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
if (offset < 4)
tps65010_set_gpio_out_value(offset + 1, value);
else if (offset < 6)
tps65010_set_led(offset - 3, value ? ON : OFF);
else
tps65010_set_vib(value);
}
static int
tps65010_output(struct gpio_chip *chip, unsigned offset, int value)
{
/* GPIOs may be input-only */
if (offset < 4) {
struct tps65010 *tps;
tps = gpiochip_get_data(chip);
if (!(tps->outmask & (1 << offset)))
return -EINVAL;
tps65010_set_gpio_out_value(offset + 1, value);
} else if (offset < 6)
tps65010_set_led(offset - 3, value ? ON : OFF);
else
tps65010_set_vib(value);
return 0;
}
static int tps65010_gpio_get(struct gpio_chip *chip, unsigned offset)
{
int value;
struct tps65010 *tps;
tps = gpiochip_get_data(chip);
if (offset < 4) {
value = i2c_smbus_read_byte_data(tps->client, TPS_DEFGPIO);
if (value < 0)
return value;
if (value & (1 << (offset + 4))) /* output */
return !(value & (1 << offset));
else /* input */
return !!(value & (1 << offset));
}
/* REVISIT we *could* report LED1/nPG and LED2 state ... */
return 0;
}
/*-------------------------------------------------------------------------*/
static struct tps65010 *the_tps;
static void tps65010_remove(struct i2c_client *client)
{
struct tps65010 *tps = i2c_get_clientdata(client);
struct tps65010_board *board = dev_get_platdata(&client->dev);
if (board && board->teardown)
board->teardown(client, &tps->chip);
if (client->irq > 0)
free_irq(client->irq, tps);
cancel_delayed_work_sync(&tps->work);
debugfs_remove(tps->file);
the_tps = NULL;
}
static int tps65010_probe(struct i2c_client *client)
{
const struct i2c_device_id *id = i2c_client_get_device_id(client);
struct tps65010 *tps;
int status;
struct tps65010_board *board = dev_get_platdata(&client->dev);
if (the_tps) {
dev_dbg(&client->dev, "only one tps6501x chip allowed\n");
return -ENODEV;
}
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EINVAL;
tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
if (!tps)
return -ENOMEM;
mutex_init(&tps->lock);
INIT_DELAYED_WORK(&tps->work, tps65010_work);
tps->client = client;
tps->model = id->driver_data;
/* the IRQ is active low, but many gpio lines can't support that
* so this driver uses falling-edge triggers instead.
*/
if (client->irq > 0) {
status = request_irq(client->irq, tps65010_irq,
IRQF_TRIGGER_FALLING | IRQF_NO_AUTOEN,
DRIVER_NAME, tps);
if (status < 0) {
dev_dbg(&client->dev, "can't get IRQ %d, err %d\n",
client->irq, status);
return status;
}
set_bit(FLAG_IRQ_ENABLE, &tps->flags);
} else
dev_warn(&client->dev, "IRQ not configured!\n");
switch (tps->model) {
case TPS65010:
case TPS65012:
tps->por = 1;
break;
/* else CHGCONFIG.POR is replaced by AUA, enabling a WAIT mode */
}
tps->chgconf = i2c_smbus_read_byte_data(client, TPS_CHGCONFIG);
show_chgconfig(tps->por, "conf/init", tps->chgconf);
show_chgstatus("chg/init",
i2c_smbus_read_byte_data(client, TPS_CHGSTATUS));
show_regstatus("reg/init",
i2c_smbus_read_byte_data(client, TPS_REGSTATUS));
pr_debug("%s: vdcdc1 0x%02x, vdcdc2 %02x, vregs1 %02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(client, TPS_VDCDC1),
i2c_smbus_read_byte_data(client, TPS_VDCDC2),
i2c_smbus_read_byte_data(client, TPS_VREGS1));
pr_debug("%s: defgpio 0x%02x, mask3 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(client, TPS_DEFGPIO),
i2c_smbus_read_byte_data(client, TPS_MASK3));
i2c_set_clientdata(client, tps);
the_tps = tps;
#if defined(CONFIG_USB_GADGET) && !defined(CONFIG_USB_OTG)
/* USB hosts can't draw VBUS. OTG devices could, later
* when OTG infrastructure enables it. USB peripherals
* could be relying on VBUS while booting, though.
*/
tps->vbus = 100;
#endif
/* unmask the "interesting" irqs, then poll once to
* kickstart monitoring, initialize shadowed status
* registers, and maybe disable VBUS draw.
*/
tps->nmask1 = ~0;
(void) i2c_smbus_write_byte_data(client, TPS_MASK1, ~tps->nmask1);
tps->nmask2 = TPS_REG_ONOFF;
if (tps->model == TPS65013)
tps->nmask2 |= TPS_REG_NO_CHG;
(void) i2c_smbus_write_byte_data(client, TPS_MASK2, ~tps->nmask2);
(void) i2c_smbus_write_byte_data(client, TPS_MASK3, 0x0f
| i2c_smbus_read_byte_data(client, TPS_MASK3));
tps65010_work(&tps->work.work);
tps->file = debugfs_create_file(DRIVER_NAME, S_IRUGO, NULL,
tps, DEBUG_FOPS);
/* optionally register GPIOs */
if (board) {
tps->outmask = board->outmask;
tps->chip.label = client->name;
tps->chip.parent = &client->dev;
tps->chip.owner = THIS_MODULE;
tps->chip.set = tps65010_gpio_set;
tps->chip.direction_output = tps65010_output;
/* NOTE: only partial support for inputs; nyet IRQs */
tps->chip.get = tps65010_gpio_get;
tps->chip.base = -1;
tps->chip.ngpio = 7;
tps->chip.can_sleep = 1;
status = gpiochip_add_data(&tps->chip, tps);
if (status < 0)
dev_err(&client->dev, "can't add gpiochip, err %d\n",
status);
else if (board->setup) {
status = board->setup(client, &tps->chip);
if (status < 0) {
dev_dbg(&client->dev,
"board %s %s err %d\n",
"setup", client->name, status);
status = 0;
}
}
}
return 0;
}
static const struct i2c_device_id tps65010_id[] = {
{ "tps65010", TPS65010 },
{ "tps65011", TPS65011 },
{ "tps65012", TPS65012 },
{ "tps65013", TPS65013 },
{ "tps65014", TPS65011 }, /* tps65011 charging at 6.5V max */
{ }
};
MODULE_DEVICE_TABLE(i2c, tps65010_id);
static struct i2c_driver tps65010_driver = {
.driver = {
.name = "tps65010",
},
.probe = tps65010_probe,
.remove = tps65010_remove,
.id_table = tps65010_id,
};
/*-------------------------------------------------------------------------*/
/* Draw from VBUS:
* 0 mA -- DON'T DRAW (might supply power instead)
* 100 mA -- usb unit load (slowest charge rate)
* 500 mA -- usb high power (fast battery charge)
*/
int tps65010_set_vbus_draw(unsigned mA)
{
unsigned long flags;
if (!the_tps)
return -ENODEV;
/* assumes non-SMP */
local_irq_save(flags);
if (mA >= 500)
mA = 500;
else if (mA >= 100)
mA = 100;
else
mA = 0;
the_tps->vbus = mA;
if ((the_tps->chgstatus & TPS_CHG_USB)
&& test_and_set_bit(
FLAG_VBUS_CHANGED, &the_tps->flags)) {
/* gadget drivers call this in_irq() */
queue_delayed_work(system_power_efficient_wq, &the_tps->work,
0);
}
local_irq_restore(flags);
return 0;
}
EXPORT_SYMBOL(tps65010_set_vbus_draw);
/*-------------------------------------------------------------------------*/
/* tps65010_set_gpio_out_value parameter:
* gpio: GPIO1, GPIO2, GPIO3 or GPIO4
* value: LOW or HIGH
*/
int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
{
int status;
unsigned defgpio;
if (!the_tps)
return -ENODEV;
if ((gpio < GPIO1) || (gpio > GPIO4))
return -EINVAL;
mutex_lock(&the_tps->lock);
defgpio = i2c_smbus_read_byte_data(the_tps->client, TPS_DEFGPIO);
/* Configure GPIO for output */
defgpio |= 1 << (gpio + 3);
/* Writing 1 forces a logic 0 on that GPIO and vice versa */
switch (value) {
case LOW:
defgpio |= 1 << (gpio - 1); /* set GPIO low by writing 1 */
break;
/* case HIGH: */
default:
defgpio &= ~(1 << (gpio - 1)); /* set GPIO high by writing 0 */
break;
}
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_DEFGPIO, defgpio);
pr_debug("%s: gpio%dout = %s, defgpio 0x%02x\n", DRIVER_NAME,
gpio, value ? "high" : "low",
i2c_smbus_read_byte_data(the_tps->client, TPS_DEFGPIO));
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65010_set_gpio_out_value);
/*-------------------------------------------------------------------------*/
/* tps65010_set_led parameter:
* led: LED1 or LED2
* mode: ON, OFF or BLINK
*/
int tps65010_set_led(unsigned led, unsigned mode)
{
int status;
unsigned led_on, led_per, offs;
if (!the_tps)
return -ENODEV;
if (led == LED1)
offs = 0;
else {
offs = 2;
led = LED2;
}
mutex_lock(&the_tps->lock);
pr_debug("%s: led%i_on 0x%02x\n", DRIVER_NAME, led,
i2c_smbus_read_byte_data(the_tps->client,
TPS_LED1_ON + offs));
pr_debug("%s: led%i_per 0x%02x\n", DRIVER_NAME, led,
i2c_smbus_read_byte_data(the_tps->client,
TPS_LED1_PER + offs));
switch (mode) {
case OFF:
led_on = 1 << 7;
led_per = 0 << 7;
break;
case ON:
led_on = 1 << 7;
led_per = 1 << 7;
break;
case BLINK:
led_on = 0x30 | (0 << 7);
led_per = 0x08 | (1 << 7);
break;
default:
printk(KERN_ERR "%s: Wrong mode parameter for set_led()\n",
DRIVER_NAME);
mutex_unlock(&the_tps->lock);
return -EINVAL;
}
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_LED1_ON + offs, led_on);
if (status != 0) {
printk(KERN_ERR "%s: Failed to write led%i_on register\n",
DRIVER_NAME, led);
mutex_unlock(&the_tps->lock);
return status;
}
pr_debug("%s: led%i_on 0x%02x\n", DRIVER_NAME, led,
i2c_smbus_read_byte_data(the_tps->client, TPS_LED1_ON + offs));
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_LED1_PER + offs, led_per);
if (status != 0) {
printk(KERN_ERR "%s: Failed to write led%i_per register\n",
DRIVER_NAME, led);
mutex_unlock(&the_tps->lock);
return status;
}
pr_debug("%s: led%i_per 0x%02x\n", DRIVER_NAME, led,
i2c_smbus_read_byte_data(the_tps->client,
TPS_LED1_PER + offs));
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65010_set_led);
/*-------------------------------------------------------------------------*/
/* tps65010_set_vib parameter:
* value: ON or OFF
*/
int tps65010_set_vib(unsigned value)
{
int status;
unsigned vdcdc2;
if (!the_tps)
return -ENODEV;
mutex_lock(&the_tps->lock);
vdcdc2 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC2);
vdcdc2 &= ~(1 << 1);
if (value)
vdcdc2 |= (1 << 1);
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_VDCDC2, vdcdc2);
pr_debug("%s: vibrator %s\n", DRIVER_NAME, value ? "on" : "off");
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65010_set_vib);
/*-------------------------------------------------------------------------*/
/* tps65010_set_low_pwr parameter:
* mode: ON or OFF
*/
int tps65010_set_low_pwr(unsigned mode)
{
int status;
unsigned vdcdc1;
if (!the_tps)
return -ENODEV;
mutex_lock(&the_tps->lock);
pr_debug("%s: %s low_pwr, vdcdc1 0x%02x\n", DRIVER_NAME,
mode ? "enable" : "disable",
i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
vdcdc1 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1);
switch (mode) {
case OFF:
vdcdc1 &= ~TPS_ENABLE_LP; /* disable ENABLE_LP bit */
break;
/* case ON: */
default:
vdcdc1 |= TPS_ENABLE_LP; /* enable ENABLE_LP bit */
break;
}
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_VDCDC1, vdcdc1);
if (status != 0)
printk(KERN_ERR "%s: Failed to write vdcdc1 register\n",
DRIVER_NAME);
else
pr_debug("%s: vdcdc1 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65010_set_low_pwr);
/*-------------------------------------------------------------------------*/
/* tps65010_config_vregs1 parameter:
* value to be written to VREGS1 register
* Note: The complete register is written, set all bits you need
*/
int tps65010_config_vregs1(unsigned value)
{
int status;
if (!the_tps)
return -ENODEV;
mutex_lock(&the_tps->lock);
pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_VREGS1, value);
if (status != 0)
printk(KERN_ERR "%s: Failed to write vregs1 register\n",
DRIVER_NAME);
else
pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65010_config_vregs1);
int tps65010_config_vdcdc2(unsigned value)
{
struct i2c_client *c;
int status;
if (!the_tps)
return -ENODEV;
c = the_tps->client;
mutex_lock(&the_tps->lock);
pr_debug("%s: vdcdc2 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(c, TPS_VDCDC2));
status = i2c_smbus_write_byte_data(c, TPS_VDCDC2, value);
if (status != 0)
printk(KERN_ERR "%s: Failed to write vdcdc2 register\n",
DRIVER_NAME);
else
pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(c, TPS_VDCDC2));
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65010_config_vdcdc2);
/*-------------------------------------------------------------------------*/
/* tps65013_set_low_pwr parameter:
* mode: ON or OFF
*/
/* FIXME: Assumes AC or USB power is present. Setting AUA bit is not
required if power supply is through a battery */
int tps65013_set_low_pwr(unsigned mode)
{
int status;
unsigned vdcdc1, chgconfig;
if (!the_tps || the_tps->por)
return -ENODEV;
mutex_lock(&the_tps->lock);
pr_debug("%s: %s low_pwr, chgconfig 0x%02x vdcdc1 0x%02x\n",
DRIVER_NAME,
mode ? "enable" : "disable",
i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG),
i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
chgconfig = i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG);
vdcdc1 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1);
switch (mode) {
case OFF:
chgconfig &= ~TPS65013_AUA; /* disable AUA bit */
vdcdc1 &= ~TPS_ENABLE_LP; /* disable ENABLE_LP bit */
break;
/* case ON: */
default:
chgconfig |= TPS65013_AUA; /* enable AUA bit */
vdcdc1 |= TPS_ENABLE_LP; /* enable ENABLE_LP bit */
break;
}
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_CHGCONFIG, chgconfig);
if (status != 0) {
printk(KERN_ERR "%s: Failed to write chconfig register\n",
DRIVER_NAME);
mutex_unlock(&the_tps->lock);
return status;
}
chgconfig = i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG);
the_tps->chgconf = chgconfig;
show_chgconfig(0, "chgconf", chgconfig);
status = i2c_smbus_write_byte_data(the_tps->client,
TPS_VDCDC1, vdcdc1);
if (status != 0)
printk(KERN_ERR "%s: Failed to write vdcdc1 register\n",
DRIVER_NAME);
else
pr_debug("%s: vdcdc1 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));
mutex_unlock(&the_tps->lock);
return status;
}
EXPORT_SYMBOL(tps65013_set_low_pwr);
/*-------------------------------------------------------------------------*/
static int __init tps_init(void)
{
return i2c_add_driver(&tps65010_driver);
}
/* NOTE: this MUST be initialized before the other parts of the system
* that rely on it ... but after the i2c bus on which this relies.
* That is, much earlier than on PC-type systems, which don't often use
* I2C as a core system bus.
*/
subsys_initcall(tps_init);
static void __exit tps_exit(void)
{
i2c_del_driver(&tps65010_driver);
}
module_exit(tps_exit);
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