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Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds

Browse Source 
* 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds:
  leds: Ensure led->trigger is set earlier
  leds: Add support for Philips PCA955x I2C LED drivers
  leds: Fix sparse warnings in leds-h1940 driver
  leds: mark led_classdev.default_trigger as const
  leds: fix unsigned value overflow in atmel pwm driver
  leds: Add pca9532 platform data for Thecus N2100
  leds: Add pca9532 led driver
This commit is contained in:
Linus Torvalds 2008-07-24 12:16:02 -07:00
commit c54554d388
10 changed files with 860 additions and 6 deletions
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52
arch/arm/mach-iop32x/n2100.c
View File

@ -17,6 +17,7 @@
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/f75375s.h>
#include <linux/leds-pca9532.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/pci.h>
@ -206,6 +207,53 @@ static struct f75375s_platform_data n2100_f75375s = {
.pwm_enable = { 0, 0 },
};
static struct pca9532_platform_data n2100_leds = {
.leds = {
{ .name = "n2100:red:satafail0",
.state = PCA9532_OFF,
.type = PCA9532_TYPE_LED,
},
{ .name = "n2100:red:satafail1",
.state = PCA9532_OFF,
.type = PCA9532_TYPE_LED,
},
{ .name = "n2100:blue:usb",
.state = PCA9532_OFF,
.type = PCA9532_TYPE_LED,
},
{ .type = PCA9532_TYPE_NONE },
{ .type = PCA9532_TYPE_NONE },
{ .type = PCA9532_TYPE_NONE },
{ .type = PCA9532_TYPE_NONE },
{ .name = "n2100:red:usb",
.state = PCA9532_OFF,
.type = PCA9532_TYPE_LED,
},
{ .type = PCA9532_TYPE_NONE }, /* power OFF gpio */
{ .type = PCA9532_TYPE_NONE }, /* reset gpio */
{ .type = PCA9532_TYPE_NONE },
{ .type = PCA9532_TYPE_NONE },
{ .type = PCA9532_TYPE_NONE },
{ .name = "n2100:orange:system",
.state = PCA9532_OFF,
.type = PCA9532_TYPE_LED,
},
{ .name = "n2100:red:system",
.state = PCA9532_OFF,
.type = PCA9532_TYPE_LED,
},
{ .name = "N2100 beeper" ,
.state = PCA9532_OFF,
.type = PCA9532_TYPE_N2100_BEEP,
},
},
.psc = { 0, 0 },
.pwm = { 0, 0 },
};
static struct i2c_board_info __initdata n2100_i2c_devices[] = {
{
I2C_BOARD_INFO("rs5c372b", 0x32),
@ -214,6 +262,10 @@ static struct i2c_board_info __initdata n2100_i2c_devices[] = {
I2C_BOARD_INFO("f75375", 0x2e),
.platform_data = &n2100_f75375s,
},
{
I2C_BOARD_INFO("pca9532", 0x60),
.platform_data = &n2100_leds,
},
};
/*

16
drivers/leds/Kconfig
View File

@ -103,6 +103,14 @@ config LEDS_HP6XX
This option enables led support for the handheld
HP Jornada 620/660/680/690.
config LEDS_PCA9532
tristate "LED driver for PCA9532 dimmer"
depends on LEDS_CLASS && I2C && INPUT && EXPERIMENTAL
help
This option enables support for NXP pca9532
led controller. It is generally only usefull
as a platform driver
config LEDS_GPIO
tristate "LED Support for GPIO connected LEDs"
depends on LEDS_CLASS && GENERIC_GPIO
@ -147,6 +155,14 @@ config LEDS_CLEVO_MAIL
To compile this driver as a module, choose M here: the
module will be called leds-clevo-mail.
config LEDS_PCA955X
tristate "LED Support for PCA955x I2C chips"
depends on LEDS_CLASS && I2C
help
This option enables support for LEDs connected to PCA955x
LED driver chips accessed via the I2C bus. Supported
devices include PCA9550, PCA9551, PCA9552, and PCA9553.
comment "LED Triggers"
config LEDS_TRIGGERS

2
drivers/leds/Makefile
View File

@ -16,11 +16,13 @@ obj-$(CONFIG_LEDS_WRAP) += leds-wrap.o
obj-$(CONFIG_LEDS_H1940) += leds-h1940.o
obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o
obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o
obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o
obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o
obj-$(CONFIG_LEDS_CM_X270) += leds-cm-x270.o
obj-$(CONFIG_LEDS_CLEVO_MAIL) += leds-clevo-mail.o
obj-$(CONFIG_LEDS_HP6XX) += leds-hp6xx.o
obj-$(CONFIG_LEDS_FSG) += leds-fsg.o
obj-$(CONFIG_LEDS_PCA955X) += leds-pca955x.o
# LED Triggers
obj-$(CONFIG_LEDS_TRIGGER_TIMER) += ledtrig-timer.o

3
drivers/leds/led-triggers.c
View File

@ -111,16 +111,17 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger)
flags);
if (led_cdev->trigger->deactivate)
led_cdev->trigger->deactivate(led_cdev);
led_cdev->trigger = NULL;
led_set_brightness(led_cdev, LED_OFF);
}
if (trigger) {
write_lock_irqsave(&trigger->leddev_list_lock, flags);
list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs);
write_unlock_irqrestore(&trigger->leddev_list_lock, flags);
led_cdev->trigger = trigger;
if (trigger->activate)
trigger->activate(led_cdev);
}
led_cdev->trigger = trigger;
}
EXPORT_SYMBOL_GPL(led_trigger_set);

2
drivers/leds/leds-atmel-pwm.c
View File

@ -37,7 +37,7 @@ static int __init pwmled_probe(struct platform_device *pdev)
{
const struct gpio_led_platform_data *pdata;
struct pwmled *leds;
unsigned i;
int i;
int status;
pdata = pdev->dev.platform_data;

9
drivers/leds/leds-h1940.c
View File

@ -23,7 +23,8 @@
/*
* Green led.
*/
void h1940_greenled_set(struct led_classdev *led_dev, enum led_brightness value)
static void h1940_greenled_set(struct led_classdev *led_dev,
enum led_brightness value)
{
switch (value) {
case LED_HALF:
@ -52,7 +53,8 @@ static struct led_classdev h1940_greenled = {
/*
* Red led.
*/
void h1940_redled_set(struct led_classdev *led_dev, enum led_brightness value)
static void h1940_redled_set(struct led_classdev *led_dev,
enum led_brightness value)
{
switch (value) {
case LED_HALF:
@ -82,7 +84,8 @@ static struct led_classdev h1940_redled = {
* Blue led.
* (it can only be blue flashing led)
*/
void h1940_blueled_set(struct led_classdev *led_dev, enum led_brightness value)
static void h1940_blueled_set(struct led_classdev *led_dev,
enum led_brightness value)
{
if (value) {
/* flashing Blue */

337
drivers/leds/leds-pca9532.c Normal file
View File

@ -0,0 +1,337 @@
/*
* pca9532.c - 16-bit Led dimmer
*
* Copyright (C) 2008 Riku Voipio <riku.voipio@movial.fi>
*
* 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; version 2 of the License.
*
* Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf
*
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/input.h>
#include <linux/mutex.h>
#include <linux/leds-pca9532.h>
static const unsigned short normal_i2c[] = { /*0x60,*/ I2C_CLIENT_END};
I2C_CLIENT_INSMOD_1(pca9532);
#define PCA9532_REG_PSC(i) (0x2+(i)*2)
#define PCA9532_REG_PWM(i) (0x3+(i)*2)
#define PCA9532_REG_LS0 0x6
#define LED_REG(led) ((led>>2)+PCA9532_REG_LS0)
#define LED_NUM(led) (led & 0x3)
#define ldev_to_led(c) container_of(c, struct pca9532_led, ldev)
struct pca9532_data {
struct i2c_client *client;
struct pca9532_led leds[16];
struct mutex update_lock;
struct input_dev *idev;
u8 pwm[2];
u8 psc[2];
};
static int pca9532_probe(struct i2c_client *client,
const struct i2c_device_id *id);
static int pca9532_remove(struct i2c_client *client);
static const struct i2c_device_id pca9532_id[] = {
{ "pca9532", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pca9532_id);
static struct i2c_driver pca9532_driver = {
.driver = {
.name = "pca9532",
},
.probe = pca9532_probe,
.remove = pca9532_remove,
.id_table = pca9532_id,
};
/* We have two pwm/blinkers, but 16 possible leds to drive. Additionaly,
* the clever Thecus people are using one pwm to drive the beeper. So,
* as a compromise we average one pwm to the values requested by all
* leds that are not ON/OFF.
* */
static int pca9532_setpwm(struct i2c_client *client, int pwm, int blink,
enum led_brightness value)
{
int a = 0, b = 0, i = 0;
struct pca9532_data *data = i2c_get_clientdata(client);
for (i = 0; i < 16; i++) {
if (data->leds[i].type == PCA9532_TYPE_LED &&
data->leds[i].state == PCA9532_PWM0+pwm) {
a++;
b += data->leds[i].ldev.brightness;
}
}
if (a == 0) {
dev_err(&client->dev,
"fear of division by zero %d/%d, wanted %d\n",
b, a, value);
return -EINVAL;
}
b = b/a;
if (b > 0xFF)
return -EINVAL;
mutex_lock(&data->update_lock);
data->pwm[pwm] = b;
i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(pwm),
data->pwm[pwm]);
data->psc[pwm] = blink;
i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(pwm),
data->psc[pwm]);
mutex_unlock(&data->update_lock);
return 0;
}
/* Set LED routing */
static void pca9532_setled(struct pca9532_led *led)
{
struct i2c_client *client = led->client;
struct pca9532_data *data = i2c_get_clientdata(client);
char reg;
mutex_lock(&data->update_lock);
reg = i2c_smbus_read_byte_data(client, LED_REG(led->id));
/* zero led bits */
reg = reg & ~(0x3<<LED_NUM(led->id)*2);
/* set the new value */
reg = reg | (led->state << LED_NUM(led->id)*2);
i2c_smbus_write_byte_data(client, LED_REG(led->id), reg);
mutex_unlock(&data->update_lock);
}
static void pca9532_set_brightness(struct led_classdev *led_cdev,
enum led_brightness value)
{
int err = 0;
struct pca9532_led *led = ldev_to_led(led_cdev);
if (value == LED_OFF)
led->state = PCA9532_OFF;
else if (value == LED_FULL)
led->state = PCA9532_ON;
else {
led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
err = pca9532_setpwm(led->client, 0, 0, value);
if (err)
return; /* XXX: led api doesn't allow error code? */
}
pca9532_setled(led);
}
static int pca9532_set_blink(struct led_classdev *led_cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
struct pca9532_led *led = ldev_to_led(led_cdev);
struct i2c_client *client = led->client;
int psc;
if (*delay_on == 0 && *delay_off == 0) {
/* led subsystem ask us for a blink rate */
*delay_on = 1000;
*delay_off = 1000;
}
if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
return -EINVAL;
/* Thecus specific: only use PSC/PWM 0 */
psc = (*delay_on * 152-1)/1000;
return pca9532_setpwm(client, 0, psc, led_cdev->brightness);
}
int pca9532_event(struct input_dev *dev, unsigned int type, unsigned int code,
int value)
{
struct pca9532_data *data = input_get_drvdata(dev);
if (type != EV_SND && (code != SND_BELL || code != SND_TONE))
return -1;
/* XXX: allow different kind of beeps with psc/pwm modifications */
if (value > 1 && value < 32767)
data->pwm[1] = 127;
else
data->pwm[1] = 0;
dev_info(&dev->dev, "setting beep to %d \n", data->pwm[1]);
mutex_lock(&data->update_lock);
i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(1),
data->pwm[1]);
mutex_unlock(&data->update_lock);
return 0;
}
static int pca9532_configure(struct i2c_client *client,
struct pca9532_data *data, struct pca9532_platform_data *pdata)
{
int i, err = 0;
for (i = 0; i < 2; i++) {
data->pwm[i] = pdata->pwm[i];
data->psc[i] = pdata->psc[i];
i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(i),
data->pwm[i]);
i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(i),
data->psc[i]);
}
for (i = 0; i < 16; i++) {
struct pca9532_led *led = &data->leds[i];
struct pca9532_led *pled = &pdata->leds[i];
led->client = client;
led->id = i;
led->type = pled->type;
switch (led->type) {
case PCA9532_TYPE_NONE:
break;
case PCA9532_TYPE_LED:
led->state = pled->state;
led->name = pled->name;
led->ldev.name = led->name;
led->ldev.brightness = LED_OFF;
led->ldev.brightness_set = pca9532_set_brightness;
led->ldev.blink_set = pca9532_set_blink;
if (led_classdev_register(&client->dev,
&led->ldev) < 0) {
dev_err(&client->dev,
"couldn't register LED %s\n",
led->name);
goto exit;
}
pca9532_setled(led);
break;
case PCA9532_TYPE_N2100_BEEP:
BUG_ON(data->idev);
led->state = PCA9532_PWM1;
pca9532_setled(led);
data->idev = input_allocate_device();
if (data->idev == NULL) {
err = -ENOMEM;
goto exit;
}
data->idev->name = pled->name;
data->idev->phys = "i2c/pca9532";
data->idev->id.bustype = BUS_HOST;
data->idev->id.vendor = 0x001f;
data->idev->id.product = 0x0001;
data->idev->id.version = 0x0100;
data->idev->evbit[0] = BIT_MASK(EV_SND);
data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
BIT_MASK(SND_TONE);
data->idev->event = pca9532_event;
input_set_drvdata(data->idev, data);
err = input_register_device(data->idev);
if (err) {
input_free_device(data->idev);
data->idev = NULL;
goto exit;
}
break;
}
}
return 0;
exit:
if (i > 0)
for (i = i - 1; i >= 0; i--)
switch (data->leds[i].type) {
case PCA9532_TYPE_NONE:
break;
case PCA9532_TYPE_LED:
led_classdev_unregister(&data->leds[i].ldev);
break;
case PCA9532_TYPE_N2100_BEEP:
if (data->idev != NULL) {
input_unregister_device(data->idev);
input_free_device(data->idev);
data->idev = NULL;
}
break;
}
return err;
}
static int pca9532_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca9532_data *data = i2c_get_clientdata(client);
struct pca9532_platform_data *pca9532_pdata = client->dev.platform_data;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
data = kzalloc(sizeof(struct pca9532_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
dev_info(&client->dev, "setting platform data\n");
i2c_set_clientdata(client, data);
data->client = client;
mutex_init(&data->update_lock);
if (pca9532_pdata == NULL)
return -EIO;
pca9532_configure(client, data, pca9532_pdata);
return 0;
}
static int pca9532_remove(struct i2c_client *client)
{
struct pca9532_data *data = i2c_get_clientdata(client);
int i;
for (i = 0; i < 16; i++)
switch (data->leds[i].type) {
case PCA9532_TYPE_NONE:
break;
case PCA9532_TYPE_LED:
led_classdev_unregister(&data->leds[i].ldev);
break;
case PCA9532_TYPE_N2100_BEEP:
if (data->idev != NULL) {
input_unregister_device(data->idev);
input_free_device(data->idev);
data->idev = NULL;
}
break;
}
kfree(data);
i2c_set_clientdata(client, NULL);
return 0;
}
static int __init pca9532_init(void)
{
return i2c_add_driver(&pca9532_driver);
}
static void __exit pca9532_exit(void)
{
i2c_del_driver(&pca9532_driver);
}
MODULE_AUTHOR("Riku Voipio <riku.voipio@movial.fi>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PCA 9532 LED dimmer");
module_init(pca9532_init);
module_exit(pca9532_exit);

384
drivers/leds/leds-pca955x.c Normal file
View File

@ -0,0 +1,384 @@
/*
* Copyright 2007-2008 Extreme Engineering Solutions, Inc.
*
* Author: Nate Case <ncase@xes-inc.com>
*
* This file is subject to the terms and conditions of version 2 of
* the GNU General Public License. See the file COPYING in the main
* directory of this archive for more details.
*
* LED driver for various PCA955x I2C LED drivers
*
* Supported devices:
*
* Device Description 7-bit slave address
* ------ ----------- -------------------
* PCA9550 2-bit driver 0x60 .. 0x61
* PCA9551 8-bit driver 0x60 .. 0x67
* PCA9552 16-bit driver 0x60 .. 0x67
* PCA9553/01 4-bit driver 0x62
* PCA9553/02 4-bit driver 0x63
*
* Philips PCA955x LED driver chips follow a register map as shown below:
*
* Control Register Description
* ---------------- -----------
* 0x0 Input register 0
* ..
* NUM_INPUT_REGS - 1 Last Input register X
*
* NUM_INPUT_REGS Frequency prescaler 0
* NUM_INPUT_REGS + 1 PWM register 0
* NUM_INPUT_REGS + 2 Frequency prescaler 1
* NUM_INPUT_REGS + 3 PWM register 1
*
* NUM_INPUT_REGS + 4 LED selector 0
* NUM_INPUT_REGS + 4
* + NUM_LED_REGS - 1 Last LED selector
*
* where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many
* bits the chip supports.
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/leds.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/workqueue.h>
/* LED select registers determine the source that drives LED outputs */
#define PCA955X_LS_LED_ON 0x0 /* Output LOW */
#define PCA955X_LS_LED_OFF 0x1 /* Output HI-Z */
#define PCA955X_LS_BLINK0 0x2 /* Blink at PWM0 rate */
#define PCA955X_LS_BLINK1 0x3 /* Blink at PWM1 rate */
enum pca955x_type {
pca9550,
pca9551,
pca9552,
pca9553,
};
struct pca955x_chipdef {
int bits;
u8 slv_addr; /* 7-bit slave address mask */
int slv_addr_shift; /* Number of bits to ignore */
};
static struct pca955x_chipdef pca955x_chipdefs[] = {
[pca9550] = {
.bits = 2,
.slv_addr = /* 110000x */ 0x60,
.slv_addr_shift = 1,
},
[pca9551] = {
.bits = 8,
.slv_addr = /* 1100xxx */ 0x60,
.slv_addr_shift = 3,
},
[pca9552] = {
.bits = 16,
.slv_addr = /* 1100xxx */ 0x60,
.slv_addr_shift = 3,
},
[pca9553] = {
.bits = 4,
.slv_addr = /* 110001x */ 0x62,
.slv_addr_shift = 1,
},
};
static const struct i2c_device_id pca955x_id[] = {
{ "pca9550", pca9550 },
{ "pca9551", pca9551 },
{ "pca9552", pca9552 },
{ "pca9553", pca9553 },
{ }
};
MODULE_DEVICE_TABLE(i2c, pca955x_id);
struct pca955x_led {
struct pca955x_chipdef *chipdef;
struct i2c_client *client;
struct work_struct work;
spinlock_t lock;
enum led_brightness brightness;
struct led_classdev led_cdev;
int led_num; /* 0 .. 15 potentially */
char name[32];
};
/* 8 bits per input register */
static inline int pca95xx_num_input_regs(int bits)
{
return (bits + 7) / 8;
}
/* 4 bits per LED selector register */
static inline int pca95xx_num_led_regs(int bits)
{
return (bits + 3) / 4;
}
/*
* Return an LED selector register value based on an existing one, with
* the appropriate 2-bit state value set for the given LED number (0-3).
*/
static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
{
return (oldval & (~(0x3 << (led_num << 1)))) |
((state & 0x3) << (led_num << 1));
}
/*
* Write to frequency prescaler register, used to program the
* period of the PWM output. period = (PSCx + 1) / 38
*/
static void pca955x_write_psc(struct i2c_client *client, int n, u8 val)
{
struct pca955x_led *pca955x = i2c_get_clientdata(client);
i2c_smbus_write_byte_data(client,
pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
val);
}
/*
* Write to PWM register, which determines the duty cycle of the
* output. LED is OFF when the count is less than the value of this
* register, and ON when it is greater. If PWMx == 0, LED is always OFF.
*
* Duty cycle is (256 - PWMx) / 256
*/
static void pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
{
struct pca955x_led *pca955x = i2c_get_clientdata(client);
i2c_smbus_write_byte_data(client,
pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
val);
}
/*
* Write to LED selector register, which determines the source that
* drives the LED output.
*/
static void pca955x_write_ls(struct i2c_client *client, int n, u8 val)
{
struct pca955x_led *pca955x = i2c_get_clientdata(client);
i2c_smbus_write_byte_data(client,
pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
val);
}
/*
* Read the LED selector register, which determines the source that
* drives the LED output.
*/
static u8 pca955x_read_ls(struct i2c_client *client, int n)
{
struct pca955x_led *pca955x = i2c_get_clientdata(client);
return (u8) i2c_smbus_read_byte_data(client,
pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
}
static void pca955x_led_work(struct work_struct *work)
{
struct pca955x_led *pca955x;
u8 ls;
int chip_ls; /* which LSx to use (0-3 potentially) */
int ls_led; /* which set of bits within LSx to use (0-3) */
pca955x = container_of(work, struct pca955x_led, work);
chip_ls = pca955x->led_num / 4;
ls_led = pca955x->led_num % 4;
ls = pca955x_read_ls(pca955x->client, chip_ls);
switch (pca955x->brightness) {
case LED_FULL:
ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
break;
case LED_OFF:
ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
break;
case LED_HALF:
ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
break;
default:
/*
* Use PWM1 for all other values. This has the unwanted
* side effect of making all LEDs on the chip share the
* same brightness level if set to a value other than
* OFF, HALF, or FULL. But, this is probably better than
* just turning off for all other values.
*/
pca955x_write_pwm(pca955x->client, 1, 255-pca955x->brightness);
ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
break;
}
pca955x_write_ls(pca955x->client, chip_ls, ls);
}
void pca955x_led_set(struct led_classdev *led_cdev, enum led_brightness value)
{
struct pca955x_led *pca955x;
pca955x = container_of(led_cdev, struct pca955x_led, led_cdev);
spin_lock(&pca955x->lock);
pca955x->brightness = value;
/*
* Must use workqueue for the actual I/O since I2C operations
* can sleep.
*/
schedule_work(&pca955x->work);
spin_unlock(&pca955x->lock);
}
static int __devinit pca955x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pca955x_led *pca955x;
int i;
int err = -ENODEV;
struct pca955x_chipdef *chip;
struct i2c_adapter *adapter;
struct led_platform_data *pdata;
chip = &pca955x_chipdefs[id->driver_data];
adapter = to_i2c_adapter(client->dev.parent);
pdata = client->dev.platform_data;
/* Make sure the slave address / chip type combo given is possible */
if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
chip->slv_addr) {
dev_err(&client->dev, "invalid slave address %02x\n",
client->addr);
return -ENODEV;
}
printk(KERN_INFO "leds-pca955x: Using %s %d-bit LED driver at "
"slave address 0x%02x\n",
id->name, chip->bits, client->addr);
if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
return -EIO;
if (pdata) {
if (pdata->num_leds != chip->bits) {
dev_err(&client->dev, "board info claims %d LEDs"
" on a %d-bit chip\n",
pdata->num_leds, chip->bits);
return -ENODEV;
}
}
for (i = 0; i < chip->bits; i++) {
pca955x = kzalloc(sizeof(struct pca955x_led), GFP_KERNEL);
if (!pca955x) {
err = -ENOMEM;
goto exit;
}
pca955x->chipdef = chip;
pca955x->client = client;
pca955x->led_num = i;
/* Platform data can specify LED names and default triggers */
if (pdata) {
if (pdata->leds[i].name)
snprintf(pca955x->name, 32, "pca955x:%s",
pdata->leds[i].name);
if (pdata->leds[i].default_trigger)
pca955x->led_cdev.default_trigger =
pdata->leds[i].default_trigger;
} else {
snprintf(pca955x->name, 32, "pca955x:%d", i);
}
spin_lock_init(&pca955x->lock);
pca955x->led_cdev.name = pca955x->name;
pca955x->led_cdev.brightness_set =
pca955x_led_set;
/*
* Client data is a pointer to the _first_ pca955x_led
* struct
*/
if (i == 0)
i2c_set_clientdata(client, pca955x);
INIT_WORK(&(pca955x->work), pca955x_led_work);
led_classdev_register(&client->dev, &(pca955x->led_cdev));
}
/* Turn off LEDs */
for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++)
pca955x_write_ls(client, i, 0x55);
/* PWM0 is used for half brightness or 50% duty cycle */
pca955x_write_pwm(client, 0, 255-LED_HALF);
/* PWM1 is used for variable brightness, default to OFF */
pca955x_write_pwm(client, 1, 0);
/* Set to fast frequency so we do not see flashing */
pca955x_write_psc(client, 0, 0);
pca955x_write_psc(client, 1, 0);
return 0;
exit:
return err;
}
static int __devexit pca955x_remove(struct i2c_client *client)
{
struct pca955x_led *pca955x = i2c_get_clientdata(client);
int leds = pca955x->chipdef->bits;
int i;
for (i = 0; i < leds; i++) {
led_classdev_unregister(&(pca955x->led_cdev));
cancel_work_sync(&(pca955x->work));
kfree(pca955x);
pca955x = pca955x + 1;
}
return 0;
}
static struct i2c_driver pca955x_driver = {
.driver = {
.name = "leds-pca955x",
.owner = THIS_MODULE,
},
.probe = pca955x_probe,
.remove = __devexit_p(pca955x_remove),
.id_table = pca955x_id,
};
static int __init pca955x_leds_init(void)
{
return i2c_add_driver(&pca955x_driver);
}
static void __exit pca955x_leds_exit(void)
{
i2c_del_driver(&pca955x_driver);
}
module_init(pca955x_leds_init);
module_exit(pca955x_leds_exit);
MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
MODULE_DESCRIPTION("PCA955x LED driver");
MODULE_LICENSE("GPL v2");

45
include/linux/leds-pca9532.h Normal file
View File

@ -0,0 +1,45 @@
/*
* pca9532.h - platform data structure for pca9532 led controller
*
* Copyright (C) 2008 Riku Voipio <riku.voipio@movial.fi>
*
* 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; version 2 of the License.
*
* Datasheet: http://www.nxp.com/acrobat/datasheets/PCA9532_3.pdf
*
*/
#ifndef __LINUX_PCA9532_H
#define __LINUX_PCA9532_H
#include <linux/leds.h>
enum pca9532_state {
PCA9532_OFF = 0x0,
PCA9532_ON = 0x1,
PCA9532_PWM0 = 0x2,
PCA9532_PWM1 = 0x3
};
enum pca9532_type { PCA9532_TYPE_NONE, PCA9532_TYPE_LED,
PCA9532_TYPE_N2100_BEEP };
struct pca9532_led {
u8 id;
struct i2c_client *client;
char *name;
struct led_classdev ldev;
enum pca9532_type type;
enum pca9532_state state;
};
struct pca9532_platform_data {
struct pca9532_led leds[16];
u8 pwm[2];
u8 psc[2];
};
#endif /* __LINUX_PCA9532_H */

16
include/linux/leds.h
View File

@ -48,7 +48,7 @@ struct led_classdev {
struct device *dev;
struct list_head node; /* LED Device list */
char *default_trigger; /* Trigger to use */
const char *default_trigger; /* Trigger to use */
#ifdef CONFIG_LEDS_TRIGGERS
/* Protects the trigger data below */
@ -118,6 +118,20 @@ extern void ledtrig_ide_activity(void);
#define ledtrig_ide_activity() do {} while(0)
#endif
/*
* Generic LED platform data for describing LED names and default triggers.
*/
struct led_info {
const char *name;
char *default_trigger;
int flags;
};
struct led_platform_data {
int num_leds;
struct led_info *leds;
};
/* For the leds-gpio driver */
struct gpio_led {
const char *name;