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leds-lp5523: use generic firmware interface 

LP55xx common driver provides generic firmware interface
 for running a LED pattern.
 LP5521 and LP5523 have many device attributes for running patterns.
 This patch cleans up those complex code.

 Removed device attributes:
 engine1_mode
 engine2_mode
 engine3_mode
 engine1_load
 engine2_load
 engine3_load
 engine1_leds
 engine2_leds
 engine3_leds

 All device attributes and functions are replaced with two callback functions,
 'firmware_cb' and 'run_engine'.

 New engine functions:
 lp5523_load/stop/run_engine(), lp5523_update_program_memory() and
 lp5523_wait_opmode_done()

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
This commit is contained in:
Milo(Woogyom) Kim 2013-02-05 19:18:51 +09:00 committed by Bryan Wu
parent 9ce7cb170f
commit db6eaf8388
1 changed files with 170 additions and 359 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

529
drivers/leds/leds-lp5523.c
View File

@ -35,6 +35,7 @@
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/platform_data/leds-lp55xx.h>
#include <linux/firmware.h>
#include "leds-lp55xx-common.h"
@ -108,20 +109,39 @@
#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
#define SHIFT_MASK(id) (((id) - 1) * 2)
/* Memory Page Selection */
#define LP5523_PAGE_ENG1 0
#define LP5523_PAGE_ENG2 1
#define LP5523_PAGE_ENG3 2
/* Program Memory Operations */
#define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */
#define LP5523_MODE_ENG2_M 0x0C
#define LP5523_MODE_ENG3_M 0x03
#define LP5523_LOAD_ENG1 0x10
#define LP5523_LOAD_ENG2 0x04
#define LP5523_LOAD_ENG3 0x01
#define LP5523_ENG1_IS_LOADING(mode) \
((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
#define LP5523_ENG2_IS_LOADING(mode) \
((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
#define LP5523_ENG3_IS_LOADING(mode) \
((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
#define LP5523_EXEC_ENG1_M 0x30 /* Enable Register */
#define LP5523_EXEC_ENG2_M 0x0C
#define LP5523_EXEC_ENG3_M 0x03
#define LP5523_EXEC_M 0x3F
#define LP5523_RUN_ENG1 0x20
#define LP5523_RUN_ENG2 0x08
#define LP5523_RUN_ENG3 0x02
enum lp5523_chip_id {
LP5523,
LP55231,
};
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;
@ -135,13 +155,17 @@ struct lp5523_led {
struct lp5523_chip {
struct mutex lock; /* Serialize control */
struct i2c_client *client;
struct lp5523_engine engines[LP5523_ENGINES];
struct lp5523_led leds[LP5523_MAX_LEDS];
struct lp5523_platform_data *pdata;
u8 num_channels;
u8 num_leds;
};
static inline void lp5523_wait_opmode_done(void)
{
usleep_range(1000, 2000);
}
static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
{
led->led_current = led_current;
@ -149,27 +173,6 @@ static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
led_current);
}
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 void 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, const u8 *pattern);
static int lp5523_write(struct i2c_client *client, u8 reg, u8 value)
{
return i2c_smbus_write_byte_data(client, reg, value);
@ -212,178 +215,163 @@ static int lp5523_post_init_device(struct lp55xx_chip *chip)
return lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
}
static int lp5523_set_engine_mode(struct lp5523_engine *engine, u8 mode)
static void lp5523_load_engine(struct lp55xx_chip *chip)
{
struct lp5523_chip *chip = engine_to_lp5523(engine);
struct i2c_client *client = chip->client;
int ret;
u8 engine_state;
enum lp55xx_engine_index idx = chip->engine_idx;
u8 mask[] = {
[LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
[LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
[LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
};
ret = lp5523_read(client, LP5523_REG_OP_MODE, &engine_state);
if (ret)
goto fail;
u8 val[] = {
[LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
[LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
[LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
};
engine_state &= ~(engine->engine_mask);
u8 page_sel[] = {
[LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
[LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
[LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
};
/* set mode only for this engine */
mode &= engine->engine_mask;
lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
engine_state |= mode;
lp5523_wait_opmode_done();
ret |= lp5523_write(client, LP5523_REG_OP_MODE, engine_state);
fail:
return ret;
lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
}
static int lp5523_load_mux(struct lp5523_engine *engine, u16 mux)
static void lp5523_stop_engine(struct lp55xx_chip *chip)
{
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;
lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
lp5523_wait_opmode_done();
}
static int lp5523_load_program(struct lp5523_engine *engine, const 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)
static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
{
int i;
u16 tmp_mux = 0;
len = min_t(int, len, LP5523_MAX_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;
}
for (i = 0; i < LP5523_MAX_LEDS; i++)
lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
}
static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
{
int ret;
u8 mode;
u8 exec;
/* stop engine */
if (!start) {
lp5523_stop_engine(chip);
lp5523_turn_off_channels(chip);
return;
}
*mux = tmp_mux;
/*
* To run the engine,
* operation mode and enable register should updated at the same time
*/
ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
if (ret)
return;
ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
if (ret)
return;
/* change operation mode to RUN only when each engine is loading */
if (LP5523_ENG1_IS_LOADING(mode)) {
mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
}
if (LP5523_ENG2_IS_LOADING(mode)) {
mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
}
if (LP5523_ENG3_IS_LOADING(mode)) {
mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
}
lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
lp5523_wait_opmode_done();
lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
}
static int lp5523_update_program_memory(struct lp55xx_chip *chip,
const u8 *data, size_t size)
{
u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
unsigned cmd;
char c[3];
int update_size;
int nrchars;
int offset = 0;
int ret;
int i;
/* clear program memory before updating */
for (i = 0; i < LP5523_PROGRAM_LENGTH; i++)
lp55xx_write(chip, LP5523_REG_PROG_MEM + i, 0);
i = 0;
while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
/* separate sscanfs because length is working only for %s */
ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
if (ret != 1)
goto err;
ret = sscanf(c, "%2x", &cmd);
if (ret != 1)
goto err;
pattern[i] = (u8)cmd;
offset += nrchars;
i++;
}
/* Each instruction is 16bit long. Check that length is even */
if (i % 2)
goto err;
update_size = i;
for (i = 0; i < update_size; i++)
lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
return 0;
err:
dev_err(&chip->cl->dev, "wrong pattern format\n");
return -EINVAL;
}
static void lp5523_mux_to_array(u16 led_mux, char *array)
static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
{
int i, pos = 0;
for (i = 0; i < LP5523_MAX_LEDS; i++)
pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
const struct firmware *fw = chip->fw;
array[pos] = '\0';
if (fw->size > LP5523_PROGRAM_LENGTH) {
dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
fw->size);
return;
}
/*
* Program momery sequence
* 1) set engine mode to "LOAD"
* 2) write firmware data into program memory
*/
lp5523_load_engine(chip);
lp5523_update_program_memory(chip, fw->data, fw->size);
}
/*--------------------------------------------------------------*/
/* 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_MAX_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)
@ -485,159 +473,10 @@ static void lp5523_led_brightness_work(struct work_struct *work)
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};
if (engine->mode != LP5523_CMD_LOAD)
return -EINVAL;
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);
ret = lp5523_load_program(engine, pattern);
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)
/* 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,
NULL,
};
@ -664,36 +503,6 @@ static void lp5523_unregister_sysfs(struct i2c_client *client)
sysfs_remove_group(&dev->kobj, &lp5523_group);
}
/*--------------------------------------------------------------*/
/* Set chip operating mode */
/*--------------------------------------------------------------*/
static void lp5523_set_mode(struct lp5523_engine *engine, u8 mode)
{
/* if in that mode already do nothing, except for run */
if (mode == engine->mode && mode != LP5523_CMD_RUN)
return;
switch (mode) {
case LP5523_CMD_RUN:
lp5523_run_program(engine);
break;
case LP5523_CMD_LOAD:
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
lp5523_set_engine_mode(engine, LP5523_CMD_LOAD);
break;
case LP5523_CMD_DISABLED:
lp5523_set_engine_mode(engine, LP5523_CMD_DISABLED);
break;
default:
return;
}
engine->mode = mode;
}
/*--------------------------------------------------------------*/
/* Probe, Attach, Remove */
/*--------------------------------------------------------------*/
/* Chip specific configurations */
static struct lp55xx_device_config lp5523_cfg = {
.reset = {
@ -708,6 +517,8 @@ static struct lp55xx_device_config lp5523_cfg = {
.post_init_device = lp5523_post_init_device,
.brightness_work_fn = lp5523_led_brightness_work,
.set_led_current = lp5523_set_led_current,
.firmware_cb = lp5523_firmware_loaded,
.run_engine = lp5523_run_engine,
};
static int lp5523_probe(struct i2c_client *client,