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kernel-ark/drivers/i2c/chips/tps65010.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

1070 lines
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/*
* tps65010 - driver for tps6501x power management chips
*
* Copyright (C) 2004 Texas Instruments
* Copyright (C) 2004-2005 David Brownell
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/suspend.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <asm/irq.h>
#include <asm/mach-types.h>
#include <asm/arch/gpio.h>
#include <asm/arch/mux.h>
#include <asm/arch/tps65010.h>
/*-------------------------------------------------------------------------*/
#define DRIVER_VERSION "2 May 2005"
#define DRIVER_NAME (tps65010_driver.driver.name)
MODULE_DESCRIPTION("TPS6501x Power Management Driver");
MODULE_LICENSE("GPL");
static unsigned short normal_i2c[] = { 0x48, /* 0x49, */ I2C_CLIENT_END };
I2C_CLIENT_INSMOD;
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 {
TPS_UNKNOWN = 0,
TPS65010,
TPS65011,
TPS65012,
TPS65013,
};
struct tps65010 {
struct i2c_client client;
struct mutex lock;
int irq;
struct work_struct 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;
/* not currently tracking GPIO state */
};
#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 */
(void) schedule_delayed_work(&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 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 irqs 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 ...
*/
software_suspend();
#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)
(void) schedule_delayed_work(&tps->work, POWER_POLL_DELAY);
/* also potentially gpio-in rise or fall */
}
/* handle IRQs and polling using keventd for now */
static void tps65010_work(void *_tps)
{
struct tps65010 *tps = _tps;
mutex_lock(&tps->lock);
tps65010_interrupt(tps);
if (test_and_clear_bit(FLAG_VBUS_CHANGED, &tps->flags)) {
int status;
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;
status = 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->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);
(void) schedule_work(&tps->work);
return IRQ_HANDLED;
}
/*-------------------------------------------------------------------------*/
static struct tps65010 *the_tps;
static int __exit tps65010_detach_client(struct i2c_client *client)
{
struct tps65010 *tps;
tps = container_of(client, struct tps65010, client);
#ifdef CONFIG_ARM
if (machine_is_omap_h2())
omap_free_gpio(58);
if (machine_is_omap_osk())
omap_free_gpio(OMAP_MPUIO(1));
#endif
free_irq(tps->irq, tps);
debugfs_remove(tps->file);
if (i2c_detach_client(client) == 0)
kfree(tps);
the_tps = NULL;
return 0;
}
static int tps65010_noscan(struct i2c_adapter *bus)
{
/* pure paranoia, in case someone adds another i2c bus
* after our init section's gone...
*/
return -ENODEV;
}
/* no error returns, they'd just make bus scanning stop */
static int __init
tps65010_probe(struct i2c_adapter *bus, int address, int kind)
{
struct tps65010 *tps;
int status;
unsigned long irqflags;
if (the_tps) {
dev_dbg(&bus->dev, "only one %s for now\n", DRIVER_NAME);
return 0;
}
tps = kzalloc(sizeof *tps, GFP_KERNEL);
if (!tps)
return 0;
mutex_init(&tps->lock);
INIT_WORK(&tps->work, tps65010_work, tps);
tps->irq = -1;
tps->client.addr = address;
tps->client.adapter = bus;
tps->client.driver = &tps65010_driver;
strlcpy(tps->client.name, DRIVER_NAME, I2C_NAME_SIZE);
status = i2c_attach_client(&tps->client);
if (status < 0) {
dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
DRIVER_NAME, address, status);
goto fail1;
}
/* the IRQ is active low, but many gpio lines can't support that
* so this driver can use falling-edge triggers instead.
*/
irqflags = IRQF_SAMPLE_RANDOM;
#ifdef CONFIG_ARM
if (machine_is_omap_h2()) {
tps->model = TPS65010;
omap_cfg_reg(W4_GPIO58);
tps->irq = OMAP_GPIO_IRQ(58);
omap_request_gpio(58);
omap_set_gpio_direction(58, 1);
irqflags |= IRQF_TRIGGER_FALLING;
}
if (machine_is_omap_osk()) {
tps->model = TPS65010;
// omap_cfg_reg(U19_1610_MPUIO1);
tps->irq = OMAP_GPIO_IRQ(OMAP_MPUIO(1));
omap_request_gpio(OMAP_MPUIO(1));
omap_set_gpio_direction(OMAP_MPUIO(1), 1);
irqflags |= IRQF_TRIGGER_FALLING;
}
if (machine_is_omap_h3()) {
tps->model = TPS65013;
// FIXME set up this board's IRQ ...
}
#endif
if (tps->irq > 0) {
status = request_irq(tps->irq, tps65010_irq,
irqflags, DRIVER_NAME, tps);
if (status < 0) {
dev_dbg(&tps->client.dev, "can't get IRQ %d, err %d\n",
tps->irq, status);
i2c_detach_client(&tps->client);
goto fail1;
}
#ifdef CONFIG_ARM
/* annoying race here, ideally we'd have an option
* to claim the irq now and enable it later.
*/
disable_irq(tps->irq);
set_bit(FLAG_IRQ_ENABLE, &tps->flags);
#endif
} else
printk(KERN_WARNING "%s: IRQ not configured!\n",
DRIVER_NAME);
switch (tps->model) {
case TPS65010:
case TPS65012:
tps->por = 1;
break;
case TPS_UNKNOWN:
printk(KERN_WARNING "%s: unknown TPS chip\n", DRIVER_NAME);
break;
/* else CHGCONFIG.POR is replaced by AUA, enabling a WAIT mode */
}
tps->chgconf = i2c_smbus_read_byte_data(&tps->client, TPS_CHGCONFIG);
show_chgconfig(tps->por, "conf/init", tps->chgconf);
show_chgstatus("chg/init",
i2c_smbus_read_byte_data(&tps->client, TPS_CHGSTATUS));
show_regstatus("reg/init",
i2c_smbus_read_byte_data(&tps->client, TPS_REGSTATUS));
pr_debug("%s: vdcdc1 0x%02x, vdcdc2 %02x, vregs1 %02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(&tps->client, TPS_VDCDC1),
i2c_smbus_read_byte_data(&tps->client, TPS_VDCDC2),
i2c_smbus_read_byte_data(&tps->client, TPS_VREGS1));
pr_debug("%s: defgpio 0x%02x, mask3 0x%02x\n", DRIVER_NAME,
i2c_smbus_read_byte_data(&tps->client, TPS_DEFGPIO),
i2c_smbus_read_byte_data(&tps->client, TPS_MASK3));
tps65010_driver.attach_adapter = tps65010_noscan;
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(&tps->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(&tps->client, TPS_MASK2, ~tps->nmask2);
(void) i2c_smbus_write_byte_data(&tps->client, TPS_MASK3, 0x0f
| i2c_smbus_read_byte_data(&tps->client, TPS_MASK3));
tps65010_work(tps);
tps->file = debugfs_create_file(DRIVER_NAME, S_IRUGO, NULL,
tps, DEBUG_FOPS);
return 0;
fail1:
kfree(tps);
return 0;
}
static int __init tps65010_scan_bus(struct i2c_adapter *bus)
{
if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA))
return -EINVAL;
return i2c_probe(bus, &addr_data, tps65010_probe);
}
static struct i2c_driver tps65010_driver = {
.driver = {
.name = "tps65010",
},
.attach_adapter = tps65010_scan_bus,
.detach_client = __exit_p(tps65010_detach_client),
};
/*-------------------------------------------------------------------------*/
/* 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() */
(void) schedule_work(&the_tps->work);
}
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);
/*-------------------------------------------------------------------------*/
/* 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)
{
u32 tries = 3;
int status = -ENODEV;
printk(KERN_INFO "%s: version %s\n", DRIVER_NAME, DRIVER_VERSION);
/* some boards have startup glitches */
while (tries--) {
status = i2c_add_driver(&tps65010_driver);
if (the_tps)
break;
i2c_del_driver(&tps65010_driver);
if (!tries) {
printk(KERN_ERR "%s: no chip?\n", DRIVER_NAME);
return -ENODEV;
}
pr_debug("%s: re-probe ...\n", DRIVER_NAME);
msleep(10);
}
#ifdef CONFIG_ARM
if (machine_is_omap_osk()) {
// FIXME: More should be placed in the initialization code
// of the submodules (DSP, ethernet, power management,
// board-osk.c). Careful: I2C is initialized "late".
/* Let LED1 (D9) blink */
tps65010_set_led(LED1, BLINK);
/* Disable LED 2 (D2) */
tps65010_set_led(LED2, OFF);
/* Set GPIO 1 HIGH to disable VBUS power supply;
* OHCI driver powers it up/down as needed.
*/
tps65010_set_gpio_out_value(GPIO1, HIGH);
/* Set GPIO 2 low to turn on LED D3 */
tps65010_set_gpio_out_value(GPIO2, HIGH);
/* Set GPIO 3 low to take ethernet out of reset */
tps65010_set_gpio_out_value(GPIO3, LOW);
/* gpio4 for VDD_DSP */
/* Enable LOW_PWR */
tps65010_set_low_pwr(ON);
/* Switch VLDO2 to 3.0V for AIC23 */
tps65010_config_vregs1(TPS_LDO2_ENABLE | TPS_VLDO2_3_0V | TPS_LDO1_ENABLE);
} else if (machine_is_omap_h2()) {
/* gpio3 for SD, gpio4 for VDD_DSP */
/* Enable LOW_PWR */
tps65010_set_low_pwr(ON);
} else if (machine_is_omap_h3()) {
/* gpio4 for SD, gpio3 for VDD_DSP */
#ifdef CONFIG_PM
/* Enable LOW_PWR */
tps65013_set_low_pwr(ON);
#endif
}
#endif
return status;
}
/* 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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