- 根目录:
- drivers
- leds
- leds-lp5523.c
/*
* lp5523.c - LP5523 LED Driver
*
* Copyright (C) 2010 Nokia Corporation
*
* Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/i2c.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/ctype.h>
#include <linux/spinlock.h>
#include <linux/wait.h>
#include <linux/leds.h>
#include <linux/leds-lp5523.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#define LP5523_REG_ENABLE 0x00
#define LP5523_REG_OP_MODE 0x01
#define LP5523_REG_RATIOMETRIC_MSB 0x02
#define LP5523_REG_RATIOMETRIC_LSB 0x03
#define LP5523_REG_ENABLE_LEDS_MSB 0x04
#define LP5523_REG_ENABLE_LEDS_LSB 0x05
#define LP5523_REG_LED_CNTRL_BASE 0x06
#define LP5523_REG_LED_PWM_BASE 0x16
#define LP5523_REG_LED_CURRENT_BASE 0x26
#define LP5523_REG_CONFIG 0x36
#define LP5523_REG_CHANNEL1_PC 0x37
#define LP5523_REG_CHANNEL2_PC 0x38
#define LP5523_REG_CHANNEL3_PC 0x39
#define LP5523_REG_STATUS 0x3a
#define LP5523_REG_GPO 0x3b
#define LP5523_REG_VARIABLE 0x3c
#define LP5523_REG_RESET 0x3d
#define LP5523_REG_TEMP_CTRL 0x3e
#define LP5523_REG_TEMP_READ 0x3f
#define LP5523_REG_TEMP_WRITE 0x40
#define LP5523_REG_LED_TEST_CTRL 0x41
#define LP5523_REG_LED_TEST_ADC 0x42
#define LP5523_REG_ENG1_VARIABLE 0x45
#define LP5523_REG_ENG2_VARIABLE 0x46
#define LP5523_REG_ENG3_VARIABLE 0x47
#define LP5523_REG_MASTER_FADER1 0x48
#define LP5523_REG_MASTER_FADER2 0x49
#define LP5523_REG_MASTER_FADER3 0x4a
#define LP5523_REG_CH1_PROG_START 0x4c
#define LP5523_REG_CH2_PROG_START 0x4d
#define LP5523_REG_CH3_PROG_START 0x4e
#define LP5523_REG_PROG_PAGE_SEL 0x4f
#define LP5523_REG_PROG_MEM 0x50
#define LP5523_CMD_LOAD 0x15 /* 00010101 */
#define LP5523_CMD_RUN 0x2a /* 00101010 */
#define LP5523_CMD_DISABLED 0x00 /* 00000000 */
#define LP5523_ENABLE 0x40
#define LP5523_AUTO_INC 0x40
#define LP5523_PWR_SAVE 0x20
#define LP5523_PWM_PWR_SAVE 0x04
#define LP5523_CP_1 0x08
#define LP5523_CP_1_5 0x10
#define LP5523_CP_AUTO 0x18
#define LP5523_INT_CLK 0x01
#define LP5523_AUTO_CLK 0x02
#define LP5523_EN_LEDTEST 0x80
#define LP5523_LEDTEST_DONE 0x80
#define LP5523_DEFAULT_CURRENT 50 /* microAmps */
#define LP5523_PROGRAM_LENGTH 32 /* in bytes */
#define LP5523_PROGRAM_PAGES 6
#define LP5523_ADC_SHORTCIRC_LIM 80
#define LP5523_LEDS 9
#define LP5523_ENGINES 3
#define LP5523_ENG_MASK_BASE 0x30 /* 00110000 */
#define LP5523_ENG_STATUS_MASK 0x07 /* 00000111 */
#define LP5523_IRQ_FLAGS IRQF_TRIGGER_FALLING
#define LP5523_EXT_CLK_USED 0x08
#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
#define SHIFT_MASK(id) (((id) - 1) * 2)
struct lp5523_engine {
int id;
u8 mode;
u8 prog_page;
u8 mux_page;
u16 led_mux;
u8 engine_mask;
};
struct lp5523_led {
int id;
u8 chan_nr;
u8 led_current;
u8 max_current;
struct led_classdev cdev;
struct work_struct brightness_work;
u8 brightness;
};
struct lp5523_chip {
struct mutex lock; /* Serialize control */
struct i2c_client *client;
struct lp5523_engine engines[LP5523_ENGINES];
struct lp5523_led leds[LP5523_LEDS];
struct lp5523_platform_data *pdata;
u8 num_channels;
u8 num_leds;
};
static inline struct lp5523_led *cdev_to_led(struct led_classdev *cdev)
{
return container_of(cdev, struct lp5523_led, cdev);
}
static inline struct lp5523_chip *engine_to_lp5523(struct lp5523_engine *engine)
{
return container_of(engine, struct lp5523_chip,
engines[engine->id - 1]);
}
static inline struct lp5523_chip *led_to_lp5523(struct lp5523_led *led)
{
return container_of(led, struct lp5523_chip,
leds[led->id]);
}
static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode);
static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode);
static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern);
static void lp5523_led_brightness_work(struct work_struct *work);
static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
{
return i2c_smbus_write_byte_data(client, reg, value);
}
static int lp5523_read(struct i2c_client *client, u8 reg, u8 *buf)
{
s32 ret = i2c_smbus_read_byte_data(client, reg);
if (ret < 0)
return -EIO;
*buf = ret;
return 0;
}
static int lp5523_detect(struct i2c_client *client)
{
int ret;
u8 buf;
ret = lp5523_write(client, LP5523_REG_ENABLE, 0x40);
if (ret)
return ret;
ret = lp5523_read(client, LP5523_REG_ENABLE, &buf);
if (ret)
return ret;
if (buf == 0x40)
return 0;
else
return -ENODEV;
}
static int lp5523_configure(struct i2c_client *client)
{
struct lp5523_chip *chip = i2c_get_clientdata(client);
int ret = 0;
u8 status;
/* one pattern per engine setting led mux start and stop addresses */
u8 pattern[][LP5523_PROGRAM_LENGTH] = {
{ 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
{ 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
{ 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
};
ret |= lp5523_write(client, LP5523_REG_ENABLE, LP5523_ENABLE);
/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
usleep_range(1000, 2000);
ret |= lp5523_write(client, LP5523_REG_CONFIG,
LP5523_AUTO_INC | LP5523_PWR_SAVE |
LP5523_CP_AUTO | LP5523_AUTO_CLK |
LP5523_PWM_PWR_SAVE);
/* turn on all leds */
ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
ret |= lp5523_write(client, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
/* hardcode 32 bytes of memory for each engine from program memory */
ret |= lp5523_write(client, LP5523_REG_CH1_PROG_START, 0x00);
ret |= lp5523_write(client, LP5523_REG_CH2_PROG_START, 0x10);
ret |= lp5523_write(client, LP5523_REG_CH3_PROG_START, 0x20);
/* write led mux address space for each channel */
ret |= lp5523_load_program(&chip->engines[0], pattern[0]);
ret |= lp5523_load_program(&chip->engines[1], pattern[1]);
ret |= lp5523_load_program(&chip->engines[2], pattern[2]);
if (ret) {
dev_err(&client->dev, "could not load mux programs\n");
return -1;
}
/* set all engines exec state and mode to run 00101010 */
ret |= lp5523_write(client, LP5523_REG_ENABLE,
(LP5523_CMD_RUN | LP5523_ENABLE));
ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_RUN);
if (ret) {
dev_err(&client->dev, "could not start mux programs\n");
return -1;
}
/* Let the programs run for couple of ms and check the engine status */
usleep_range(3000, 6000);
lp5523_read(client, LP5523_REG_STATUS, &status);
status &= LP5523_ENG_STATUS_MASK;
if (status == LP5523_ENG_STATUS_MASK) {
dev_dbg(&client->dev, "all engines configured\n");
} else {
dev_info(&client->dev, "status == %x\n", status);
dev_err(&client->dev, "cound not configure LED engine\n");
return -1;
}
dev_info(&client->dev, "disabling engines\n");
ret |= lp5523_write(client, LP5523_REG_OP_MODE, LP5523_CMD_DISABLED);
return ret;
}
static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
{
struct lp5523_chip *chip = engine_to_lp5523(engine);
struct i2c_client *client = chip->client;
int ret;
u8 engine_state;
ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
if (ret)
goto fail;
engine_state &= ~(engine->engine_mask);
/* set mode only for this engine */
mode &= engine->engine_mask;
engine_state |= mode;
ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
fail:
return ret;
}
static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
{
struct lp5523_chip *chip = engine_to_lp5523(engine);
struct i2c_client *client = chip->client;
int ret = 0;
ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL, engine->mux_page);
ret |= lp5523_write(client, LP5523_REG_PROG_MEM,
(u8)(mux >> 8));
ret |= lp5523_write(client, LP5523_REG_PROG_MEM + 1, (u8)(mux));
engine->led_mux = mux;
return ret;
}
static int lp5523_load_program(struct lp5523_engine *engine, u8 *pattern)
{
struct lp5523_chip *chip = engine_to_lp5523(engine);
struct i2c_client *client = chip->client;
int ret = 0;
ret |= lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
ret |= lp5523_write(client, LP5523_REG_PROG_PAGE_SEL,
engine->prog_page);
ret |= i2c_smbus_write_i2c_block_data(client, LP5523_REG_PROG_MEM,
LP5523_PROGRAM_LENGTH, pattern);
return ret;
}
static int lp5523_run_program(struct lp5523_engine *engine)
{
struct lp5523_chip *chip = engine_to_lp5523(engine);
struct i2c_client *client = chip->client;
int ret;
ret = lp5523_write(client, LP5523_REG_ENABLE,
LP5523_CMD_RUN | LP5523_ENABLE);
if (ret)
goto fail;
ret = lp5523_set_engine_mode(engine, LP5523_CMD_RUN);
fail:
return ret;
}
static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
{
int i;
u16 tmp_mux = 0;
len = len < LP5523_LEDS ? len : LP5523_LEDS;
for (i = 0; i < len; i++) {
switch (buf[i]) {
case '1':
tmp_mux |= (1 << i);
break;
case '0':
break;
case '\n':
i = len;
break;
default:
return -1;
}
}
*mux = tmp_mux;
return 0;
}
static void lp5523_mux_to_array(u16 led_mux, char *array)
{
int i, pos = 0;
for (i = 0; i < LP5523_LEDS; i++)
pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
array[pos] = '\0';
}
/*--------------------------------------------------------------*/
/* Sysfs interface */
/*--------------------------------------------------------------*/
static ssize_t show_engine_leds(struct device *dev,
struct device_attribute *attr,
char *buf, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
char mux[LP5523_LEDS + 1];
lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
return sprintf(buf, "%s\n", mux);
}
#define show_leds(nr) \
static ssize_t show_engine##nr##_leds(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
return show_engine_leds(dev, attr, buf, nr); \
}
show_leds(1)
show_leds(2)
show_leds(3)
static ssize_t store_engine_leds(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
u16 mux = 0;
ssize_t ret;
if (lp5523_mux_parse(buf, &mux, len))
return -EINVAL;
mutex_lock(&chip->lock);
ret = -EINVAL;
if (chip->engines[nr - 1].mode != LP5523_CMD_LOAD)
goto leave;
if (lp5523_load_mux(&chip->engines[nr - 1], mux))
goto leave;
ret = len;
leave:
mutex_unlock(&chip->lock);
return ret;
}
#define store_leds(nr) \
static ssize_t store_engine##nr##_leds(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t len) \
{ \
return store_engine_leds(dev, attr, buf, len, nr); \
}
store_leds(1)
store_leds(2)
store_leds(3)
static ssize_t lp5523_selftest(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
int i, ret, pos = 0;
int led = 0;
u8 status, adc, vdd;
mutex_lock(&chip->lock);
ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
if (ret < 0)
goto fail;
/* Check that ext clock is really in use if requested */
if ((chip->pdata) && (chip->pdata->clock_mode == LP5523_CLOCK_EXT))
if ((status & LP5523_EXT_CLK_USED) == 0)
goto fail;
/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
lp5523_write(chip->client, LP5523_REG_LED_TEST_CTRL,
LP5523_EN_LEDTEST | 16);
usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
if (!(status & LP5523_LEDTEST_DONE))
usleep_range(3000, 6000); /* Was not ready. Wait little bit */
ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &vdd);
vdd--; /* There may be some fluctuation in measurement */
for (i = 0; i < LP5523_LEDS; i++) {
/* Skip non-existing channels */
if (chip->pdata->led_config[i].led_current == 0)
continue;
/* Set default current */
lp5523_write(chip->client,
LP5523_REG_LED_CURRENT_BASE + i,
chip->pdata->led_config[i].led_current);
lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0xff);
/* let current stabilize 2 - 4ms before measurements start */
usleep_range(2000, 4000);
lp5523_write(chip->client,
LP5523_REG_LED_TEST_CTRL,
LP5523_EN_LEDTEST | i);
/* ADC conversion time is 2.7 ms typically */
usleep_range(3000, 6000);
ret = lp5523_read(chip->client, LP5523_REG_STATUS, &status);
if (!(status & LP5523_LEDTEST_DONE))
usleep_range(3000, 6000);/* Was not ready. Wait. */
ret |= lp5523_read(chip->client, LP5523_REG_LED_TEST_ADC, &adc);
if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
pos += sprintf(buf + pos, "LED %d FAIL\n", i);
lp5523_write(chip->client, LP5523_REG_LED_PWM_BASE + i, 0x00);
/* Restore current */
lp5523_write(chip->client,
LP5523_REG_LED_CURRENT_BASE + i,
chip->leds[led].led_current);
led++;
}
if (pos == 0)
pos = sprintf(buf, "OK\n");
goto release_lock;
fail:
pos = sprintf(buf, "FAIL\n");
release_lock:
mutex_unlock(&chip->lock);
return pos;
}
static void lp5523_set_brightness(struct led_classdev *cdev,
enum led_brightness brightness)
{
struct lp5523_led *led = cdev_to_led(cdev);
led->brightness = (u8)brightness;
schedule_work(&led->brightness_work);
}
static void lp5523_led_brightness_work(struct work_struct *work)
{
struct lp5523_led *led = container_of(work,
struct lp5523_led,
brightness_work);
struct lp5523_chip *chip = led_to_lp5523(led);
struct i2c_client *client = chip->client;
mutex_lock(&chip->lock);
lp5523_write(client, LP5523_REG_LED_PWM_BASE + led->chan_nr,
led->brightness);
mutex_unlock(&chip->lock);
}
static int lp5523_do_store_load(struct lp5523_engine *engine,
const char *buf, size_t len)
{
struct lp5523_chip *chip = engine_to_lp5523(engine);
struct i2c_client *client = chip->client;
int ret, nrchars, offset = 0, i = 0;
char c[3];
unsigned cmd;
u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
while ((offset < len - 1) && (i < LP5523_PROGRAM_LENGTH)) {
/* separate sscanfs because length is working only for %s */
ret = sscanf(buf + offset, "%2s%n ", c, &nrchars);
ret = sscanf(c, "%2x", &cmd);
if (ret != 1)
goto fail;
pattern[i] = (u8)cmd;
offset += nrchars;
i++;
}
/* Each instruction is 16bit long. Check that length is even */
if (i % 2)
goto fail;
mutex_lock(&chip->lock);
if (engine->mode == LP5523_CMD_LOAD)
ret = lp5523_load_program(engine, pattern);
else
ret = -EINVAL;
mutex_unlock(&chip->lock);
if (ret) {
dev_err(&client->dev, "failed loading pattern\n");
return ret;
}
return len;
fail:
dev_err(&client->dev, "wrong pattern format\n");
return -EINVAL;
}
static ssize_t store_engine_load(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
return lp5523_do_store_load(&chip->engines[nr - 1], buf, len);
}
#define store_load(nr) \
static ssize_t store_engine##nr##_load(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t len) \
{ \
return store_engine_load(dev, attr, buf, len, nr); \
}
store_load(1)
store_load(2)
store_load(3)
static ssize_t show_engine_mode(struct device *dev,
struct device_attribute *attr,
char *buf, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
switch (chip->engines[nr - 1].mode) {
case LP5523_CMD_RUN:
return sprintf(buf, "run\n");
case LP5523_CMD_LOAD:
return sprintf(buf, "load\n");
case LP5523_CMD_DISABLED:
return sprintf(buf, "disabled\n");
default:
return sprintf(buf, "disabled\n");
}
}
#define show_mode(nr) \
static ssize_t show_engine##nr##_mode(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
return show_engine_mode(dev, attr, buf, nr); \
}
show_mode(1)
show_mode(2)
show_mode(3)
static ssize_t store_engine_mode(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len, int nr)
{
struct i2c_client *client = to_i2c_client(dev);
struct lp5523_chip *chip = i2c_get_clientdata(client);
struct lp5523_engine *engine = &chip->engines[nr - 1];
mutex_lock(&chip->lock);
if (!strncmp(buf, "run", 3))
lp5523_set_mode(engine, LP5523_CMD_RUN);
else if (!strncmp(buf, "load", 4))
lp5523_set_mode(engine, LP5523_CMD_LOAD);
else if (!strncmp(buf, "disabled", 8))
lp5523_set_mode(engine, LP5523_CMD_DISABLED);
mutex_unlock(&chip->lock);
return len;
}
#define store_mode(nr) \
static ssize_t store_engine##nr##_mode(struct device *dev, \
struct device_attribute *attr, \
const char *buf, size_t len) \
{ \
return store_engine_mode(dev, attr, buf, len, nr); \
}
store_mode(1)
store_mode(2)
store_mode(3)
static ssize_t show_max_current(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lp5523_led *led = cdev_to_led(led_cdev);
return sprintf(buf, "%d\n", led->max_current);
}
static ssize_t show_current(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lp5523_led *led = cdev_to_led(led_cdev);
return sprintf(buf, "%d\n", led->led_current);
}
static ssize_t store_current(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct led_classdev *led_cdev = dev_get_drvdata(dev);
struct lp5523_led *led = cdev_to_led(led_cdev);
struct lp5523_chip *chip = led_to_lp5523(led);
ssize_t ret;
unsigned long curr;
if (strict_strtoul(buf, 0, &curr))
return -EINVAL;
if (curr > led->max_current)
return -EINVAL;
mutex_lock(&chip->lock);
ret = lp5523_write(chip->client,
LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
(u8)curr);
mutex_unlock(&chip->lock);
if (ret < 0)
return ret;
led->led_current = (u8)curr;
return len;
}
/* led class device attributes */
static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, show_current, store_current);
static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
static struct attribute *lp5523_led_attributes[] = {
&dev_attr_led_current.attr,
&dev_attr_max_current.attr,
NULL,
};
static struct attribute_group lp5523_led_attribute_group = {
.attrs = lp5523_led_attributes
};
/* device attributes */
static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUSR,
show_engine1_mode, store_engine1_mode);
static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUSR,
show_engine2_mode, store_engine2_mode);
static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUSR,
show_engine3_mode, store_engine3_mode);
static DEVICE_ATTR(engine1_leds, S_IRUGO | S_IWUSR,
show_engine1_leds, store_engine1_leds);
static DEVICE_ATTR(engine2_leds, S_IRUGO | S_IWUSR,
show_engine2_leds, store_engine2_leds);
static DEVICE_ATTR(engine3_leds, S_IRUGO | S_IWUSR,
show_engine3_leds, store_engine3_leds);
static DEVICE_ATTR(engine1_load, S_IWUSR, NULL, store_engine1_load);
static DEVICE_ATTR(engine2_load, S_IWUSR, NULL, store_engine2_load);
static DEVICE_ATTR(engine3_load, S_IWUSR, NULL, store_engine3_load);
static DEVICE_ATTR(selftest, S_IRUGO, lp5523_selftest, NULL);
static struct attribute *lp5523_attributes[] = {
&dev_attr_engine1_mode.attr,
&dev_attr_engine2_mode.attr,
&dev_attr_engine3_mode.attr,
&dev_attr_selftest.attr,
&dev_attr_engine1_load.attr,
&dev_attr_engine1_leds.attr,
&dev_attr_engine2_load.attr,
&dev_attr_engine2_leds.attr,
&dev_attr_engine3_load.attr,
&dev_attr_engine3_leds.attr,
};
static const struct attribute_group lp5523_group = {
.attrs = lp5523_attributes,
};
static int lp5523_register_sysfs(struct i2c_client *client)
{
struct device *dev = &client->dev;
int ret;
ret = sysfs_create_group(&dev->kobj, &lp5523_group);
if (ret < 0)
return ret;
return 0;
}
static void lp5523_unregister_sysfs(struct i2c_client *client)
{
struct lp5523_chip *chip = i2c_get_clientdata(client);
struct device *dev = &client->dev;
int i;
sysfs_remove_group(&dev->kobj, &lp5523_group);
for (i = 0; i < chip->num_leds; i++)
sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
&lp5523_led_attribute_group);
}
/*--------------------------------------------------------------*/
/* Set chip operating mode */
/*--------------------------------------------------------------*/
static int lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
{
int ret = 0;
/* if in that mode already do nothing, except for run */
if (mode == engine->mode && mode != LP5523_CMD_RUN)
return 0;
if (mode == LP5523_CMD_RUN) {
ret = lp5523_run_program(engine);
} else if (mode == LP5523_CMD_LOAD) {
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
} else if (mode == LP5523_CMD_DISABLED) {
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
}
engine->mode = mode;
return ret;
}
/*--------------------------------------------------------------*/
/* Probe, Attach, Remove */
/*--------------------------------------------------------------*/
static int __init lp5523_init_engine(struct lp5523_engine *engine, int id)
{
if (id < 1 || id > LP5523_ENGINES)
return -1;
engine->id = id;
engine->engine_mask = LP5523_ENG_MASK_BASE >> SHIFT_MASK(id);
engine->prog_page = id - 1;
engine->mux_page = id + 2;
return 0;
}
static int __devinit lp5523_init_led(struct lp5523_led *led, struct device *dev,
int chan, struct lp5523_platform_data *pdata)
{
char name[32];
int res;
if (chan >= LP5523_LEDS)
return -EINVAL;
if (pdata->led_config[chan].led_current) {
led->led_current = pdata->led_config[chan].led_current;
led->max_current = pdata->led_config[chan].max_current;
led->chan_nr = pdata->led_config[chan].chan_nr;
if (led->chan_nr >= LP5523_LEDS) {
dev_err(dev, "Use channel numbers between 0 and %d\n",
LP5523_LEDS - 1);
return -EINVAL;
}
snprintf(name, sizeof(name), "%s:channel%d",
pdata->label ?: "lp5523", chan);
led->cdev.name = name;
led->cdev.brightness_set = lp5523_set_brightness;
res = led_classdev_register(dev, &led->cdev);
if (res < 0) {
dev_err(dev, "couldn't register led on channel %d\n",
chan);
return res;
}
res = sysfs_create_group(&led->cdev.dev->kobj,
&lp5523_led_attribute_group);
if (res < 0) {
dev_err(dev, "couldn't register current attribute\n");
led_classdev_unregister(&led->cdev);
return res;
}
} else {
led->led_current = 0;
}
return 0;
}
static struct i2c_driver lp5523_driver;
static int __devinit lp5523_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct lp5523_chip *chip;
struct lp5523_platform_data *pdata;
int ret, i, led;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip)
return -ENOMEM;
i2c_set_clientdata(client, chip);
chip->client = client;
pdata = client->dev.platform_data;
if (!pdata) {
dev_err(&client->dev, "no platform data\n");
ret = -EINVAL;
goto fail1;
}
mutex_init(&chip->lock);
chip->pdata = pdata;
if (pdata->setup_resources) {
ret = pdata->setup_resources();
if (ret < 0)
goto fail1;
}
if (pdata->enable) {
pdata->enable(0);
usleep_range(1000, 2000); /* Keep enable down at least 1ms */
pdata->enable(1);
usleep_range(1000, 2000); /* 500us abs min. */
}
lp5523_write(client, LP5523_REG_RESET, 0xff);
usleep_range(10000, 20000); /*
* Exact value is not available. 10 - 20ms
* appears to be enough for reset.
*/
ret = lp5523_detect(client);
if (ret)
goto fail2;
dev_info(&client->dev, "LP5523 Programmable led chip found\n");
/* Initialize engines */
for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
ret = lp5523_init_engine(&chip->engines[i], i + 1);
if (ret) {
dev_err(&client->dev, "error initializing engine\n");
goto fail2;
}
}
ret = lp5523_configure(client);
if (ret < 0) {
dev_err(&client->dev, "error configuring chip\n");
goto fail2;
}
/* Initialize leds */
chip->num_channels = pdata->num_channels;
chip->num_leds = 0;
led = 0;
for (i = 0; i < pdata->num_channels; i++) {
/* Do not initialize channels that are not connected */
if (pdata->led_config[i].led_current == 0)
continue;
ret = lp5523_init_led(&chip->leds[led], &client->dev, i, pdata);
if (ret) {
dev_err(&client->dev, "error initializing leds\n");
goto fail3;
}
chip->num_leds++;
chip->leds[led].id = led;
/* Set LED current */
lp5523_write(client,
LP5523_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
chip->leds[led].led_current);
INIT_WORK(&(chip->leds[led].brightness_work),
lp5523_led_brightness_work);
led++;
}
ret = lp5523_register_sysfs(client);
if (ret) {
dev_err(&client->dev, "registering sysfs failed\n");
goto fail3;
}
return ret;
fail3:
for (i = 0; i < chip->num_leds; i++) {
led_classdev_unregister(&chip->leds[i].cdev);
cancel_work_sync(&chip->leds[i].brightness_work);
}
fail2:
if (pdata->enable)
pdata->enable(0);
if (pdata->release_resources)
pdata->release_resources();
fail1:
kfree(chip);
return ret;
}
static int lp5523_remove(struct i2c_client *client)
{
struct lp5523_chip *chip = i2c_get_clientdata(client);
int i;
lp5523_unregister_sysfs(client);
for (i = 0; i < chip->num_leds; i++) {
led_classdev_unregister(&chip->leds[i].cdev);
cancel_work_sync(&chip->leds[i].brightness_work);
}
if (chip->pdata->enable)
chip->pdata->enable(0);
if (chip->pdata->release_resources)
chip->pdata->release_resources();
kfree(chip);
return 0;
}
static const struct i2c_device_id lp5523_id[] = {
{ "lp5523", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, lp5523_id);
static struct i2c_driver lp5523_driver = {
.driver = {
.name = "lp5523",
},
.probe = lp5523_probe,
.remove = lp5523_remove,
.id_table = lp5523_id,
};
static int __init lp5523_init(void)
{
int ret;
ret = i2c_add_driver(&lp5523_driver);
if (ret < 0)
printk(KERN_ALERT "Adding lp5523 driver failed\n");
return ret;
}
static void __exit lp5523_exit(void)
{
i2c_del_driver(&lp5523_driver);
}
module_init(lp5523_init);
module_exit(lp5523_exit);
MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
MODULE_DESCRIPTION("LP5523 LED engine");
MODULE_LICENSE("GPL");