[PATCHv2 1/4] leds: driver for National Semiconductor LP5521 chip

Samu Onkalo
2010-09-29T09:11:11Z

LP5521 chip is three channel led driver with programmable engines.
Driver provides support for that chip for direct access via led class or
via programmable engines.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
---
drivers/leds/leds-lp5521.c | 821 +++++++++++++++++++++++++++++++++++++++++++
include/linux/leds-lp5521.h | 48 +++
2 files changed, 869 insertions(+), 0 deletions(-)
create mode 100644 drivers/leds/leds-lp5521.c
create mode 100644 include/linux/leds-lp5521.h

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
new file mode 100644
index 0000000..3782f31
--- /dev/null
+++ b/drivers/leds/leds-lp5521.c
@@ -0,0 +1,821 @@
+/*
+ * LP5521 LED chip 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-lp5521.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+
+#define LP5521_PROGRAM_LENGTH 32 /* in bytes */
+
+#define LP5521_MAX_LEDS 3 /* Maximum number of LEDs */
+#define LP5521_MAX_ENGINES 3 /* Maximum number of engines */
+
+#define LP5521_ENG_MASK_BASE 0x30 /* 00110000 */
+#define LP5521_ENG_STATUS_MASK 0x07 /* 00000111 */
+
+#define LP5521_CMD_LOAD 0x15 /* 00010101 */
+#define LP5521_CMD_RUN 0x2a /* 00101010 */
+#define LP5521_CMD_DIRECT 0x3f /* 00111111 */
+#define LP5521_CMD_DISABLED 0x00 /* 00000000 */
+
+/* Registers */
+#define LP5521_REG_ENABLE 0x00
+#define LP5521_REG_OP_MODE 0x01
+#define LP5521_REG_R_PWM 0x02
+#define LP5521_REG_G_PWM 0x03
+#define LP5521_REG_B_PWM 0x04
+#define LP5521_REG_R_CURRENT 0x05
+#define LP5521_REG_G_CURRENT 0x06
+#define LP5521_REG_B_CURRENT 0x07
+#define LP5521_REG_CONFIG 0x08
+#define LP5521_REG_R_CHANNEL_PC 0x09
+#define LP5521_REG_G_CHANNEL_PC 0x0A
+#define LP5521_REG_B_CHANNEL_PC 0x0B
+#define LP5521_REG_STATUS 0x0C
+#define LP5521_REG_RESET 0x0D
+#define LP5521_REG_GPO 0x0E
+#define LP5521_REG_R_PROG_MEM 0x10
+#define LP5521_REG_G_PROG_MEM 0x30
+#define LP5521_REG_B_PROG_MEM 0x50
+
+#define LP5521_PROG_MEM_BASE LP5521_REG_R_PROG_MEM
+#define LP5521_PROG_MEM_SIZE 0x20
+
+/* Base register to set LED current */
+#define LP5521_REG_LED_CURRENT_BASE LP5521_REG_R_CURRENT
+
+/* Base register to set the brightness */
+#define LP5521_REG_LED_PWM_BASE LP5521_REG_R_PWM
+
+/* Bits in ENABLE register */
+#define LP5521_MASTER_ENABLE 0x40 /* Chip master enable */
+#define LP5521_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */
+#define LP5521_EXEC_RUN 0x2A
+
+/* Bits in CONFIG register */
+#define LP5521_PWM_HF 0x40 /* PWM: 0 = 256Hz, 1 = 558Hz */
+#define LP5521_PWRSAVE_EN 0x20 /* 1 = Power save mode */
+#define LP5521_CP_MODE_OFF 0 /* Charge pump (CP) off */
+#define LP5521_CP_MODE_BYPASS 8 /* CP forced to bypass mode */
+#define LP5521_CP_MODE_1X5 0x10 /* CP forced to 1.5x mode */
+#define LP5521_CP_MODE_AUTO 0x18 /* Automatic mode selection */
+#define LP5521_R_TO_BATT 4 /* R out: 0 = CP, 1 = Vbat */
+#define LP5521_CLK_SRC_EXT 0 /* Ext-clk source (CLK_32K) */
+#define LP5521_CLK_INT 1 /* Internal clock */
+#define LP5521_CLK_AUTO 2 /* Automatic clock selection */
+
+/* Status */
+#define LP5521_EXT_CLK_USED 0x08
+
+struct lp5521_engine {
+ const struct attribute_group *attributes;
+ int id;
+ u8 mode;
+ u8 prog_page;
+ u8 engine_mask;
+};
+
+struct lp5521_led {
+ int id;
+ u8 chan_nr;
+ u8 led_current;
+ u8 max_current;
+ struct led_classdev cdev;
+ struct work_struct brightness_work;
+ u8 brightness;
+};
+
+struct lp5521_chip {
+ struct lp5521_platform_data *pdata;
+ struct mutex lock; /* Serialize control */
+ struct i2c_client *client;
+ struct lp5521_engine engines[LP5521_MAX_ENGINES];
+ struct lp5521_led leds[LP5521_MAX_LEDS];
+ u8 num_channels;
+ u8 num_leds;
+};
+
+#define cdev_to_led(c) container_of(c, struct lp5521_led, cdev)
+#define engine_to_lp5521(eng) container_of((eng), struct lp5521_chip, \
+ engines[(eng)->id - 1])
+#define led_to_lp5521(led) container_of((led), struct lp5521_chip, \
+ leds[(led)->id])
+
+static void lp5521_led_brightness_work(struct work_struct *work);
+
+static inline int lp5521_write(struct i2c_client *client, u8 reg, u8 value)
+{
+ return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+static int lp5521_read(struct i2c_client *client, u8 reg, u8 *buf)
+{
+ s32 ret;
+
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0)
+ return -EIO;
+
+ *buf = ret;
+ return 0;
+}
+
+static int lp5521_set_engine_mode(struct lp5521_engine *engine, u8 mode)
+{
+ struct lp5521_chip *chip = engine_to_lp5521(engine);
+ struct i2c_client *client = chip->client;
+ int ret;
+ u8 engine_state;
+
+ /* Only transition between RUN and DIRECT mode are handled here */
+ if (mode == LP5521_CMD_LOAD)
+ return 0;
+
+ if (mode == LP5521_CMD_DISABLED)
+ mode = LP5521_CMD_DIRECT;
+
+ ret = lp5521_read(client, LP5521_REG_OP_MODE, &engine_state);
+
+ /* set mode only for this engine */
+ engine_state &= ~(engine->engine_mask);
+ mode &= engine->engine_mask;
+ engine_state |= mode;
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, engine_state);
+
+ return ret;
+}
+
+static int lp5521_load_program(struct lp5521_engine *eng, const u8 *pattern)
+{
+ struct lp5521_chip *chip = engine_to_lp5521(eng);
+ struct i2c_client *client = chip->client;
+ int ret;
+ int addr;
+ u8 mode;
+
+ /* move current engine to direct mode and remember the state */
+ ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
+ usleep_range(1000, 10000);
+ ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
+
+ /* For loading, all the engines to load mode */
+ lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
+ usleep_range(1000, 10000);
+ lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
+ usleep_range(1000, 10000);
+
+ addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
+ i2c_smbus_write_i2c_block_data(client,
+ addr,
+ LP5521_PROG_MEM_SIZE,
+ pattern);
+
+ ret |= lp5521_write(client, LP5521_REG_OP_MODE, mode);
+ return ret;
+}
+
+static int lp5521_set_led_current(struct lp5521_chip *chip, int led, u8 curr)
+{
+ return lp5521_write(chip->client,
+ LP5521_REG_LED_CURRENT_BASE + chip->leds[led].chan_nr,
+ curr);
+}
+
+static void lp5521_init_engine(struct lp5521_chip *chip,
+ const struct attribute_group *attr_group)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
+ chip->engines[i].id = i + 1;
+ chip->engines[i].engine_mask = LP5521_ENG_MASK_BASE >> (i * 2);
+ chip->engines[i].prog_page = i;
+ chip->engines[i].attributes = &attr_group[i];
+ }
+}
+
+static int lp5521_configure(struct i2c_client *client,
+ const struct attribute_group *attr_group)
+{
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+ int ret;
+
+ lp5521_init_engine(chip, attr_group);
+
+ lp5521_write(client, LP5521_REG_RESET, 0xff);
+
+ usleep_range(10000, 20000);
+
+ /* Set all PWMs to direct control mode */
+ ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
+
+ /* Enable auto-powersave, set charge pump to auto, red to battery */
+ ret |= lp5521_write(client, LP5521_REG_CONFIG,
+ LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT);
+
+ /* Initialize all channels PWM to zero -> leds off */
+ ret |= lp5521_write(client, LP5521_REG_R_PWM, 0);
+ ret |= lp5521_write(client, LP5521_REG_G_PWM, 0);
+ ret |= lp5521_write(client, LP5521_REG_B_PWM, 0);
+
+ /* Set engines are set to run state when OP_MODE enables engines */
+ ret |= lp5521_write(client, LP5521_REG_ENABLE,
+ LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
+ LP5521_EXEC_RUN);
+ /* enable takes 500us */
+ usleep_range(500, 20000);
+
+ return ret;
+}
+
+static int lp5521_run_selftest(struct lp5521_chip *chip, char *buf)
+{
+ int ret;
+ u8 status;
+
+ ret = lp5521_read(chip->client, LP5521_REG_STATUS, &status);
+ if (ret < 0)
+ return ret;
+
+ /* Check that ext clock is really in use if requested */
+ if (chip->pdata && chip->pdata->clock_mode == LP5521_CLOCK_EXT)
+ if ((status & LP5521_EXT_CLK_USED) == 0)
+ return -EIO;
+ return 0;
+}
+
+static void lp5521_set_brightness(struct led_classdev *cdev,
+ enum led_brightness brightness)
+{
+ struct lp5521_led *led = cdev_to_led(cdev);
+ led->brightness = (u8)brightness;
+ schedule_work(&led->brightness_work);
+}
+
+static void lp5521_led_brightness_work(struct work_struct *work)
+{
+ struct lp5521_led *led = container_of(work,
+ struct lp5521_led,
+ brightness_work);
+ struct lp5521_chip *chip = led_to_lp5521(led);
+ struct i2c_client *client = chip->client;
+
+ mutex_lock(&chip->lock);
+ lp5521_write(client, LP5521_REG_LED_PWM_BASE + led->chan_nr,
+ led->brightness);
+ mutex_unlock(&chip->lock);
+}
+
+/* Detect the chip by setting its ENABLE register and reading it back. */
+static int lp5521_detect(struct i2c_client *client)
+{
+ int ret;
+ u8 buf;
+
+ ret = lp5521_write(client, LP5521_REG_ENABLE,
+ LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
+ if (ret)
+ return ret;
+ usleep_range(1000, 10000);
+ ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
+ if (ret)
+ return ret;
+ if (buf != (LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM))
+ return -ENODEV;
+
+ return 0;
+}
+
+/* Set engine mode and create appropriate sysfs attributes, if required. */
+static int lp5521_set_mode(struct lp5521_engine *engine, u8 mode)
+{
+ struct lp5521_chip *chip = engine_to_lp5521(engine);
+ struct i2c_client *client = chip->client;
+ struct device *dev = &client->dev;
+ int ret = 0;
+
+ /* if in that mode already do nothing, except for run */
+ if (mode == engine->mode && mode != LP5521_CMD_RUN)
+ return 0;
+
+ if (mode == LP5521_CMD_RUN) {
+ ret = lp5521_set_engine_mode(engine, LP5521_CMD_RUN);
+ } else if (mode == LP5521_CMD_LOAD) {
+ lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
+ lp5521_set_engine_mode(engine, LP5521_CMD_LOAD);
+
+ ret = sysfs_create_group(&dev->kobj, engine->attributes);
+ if (ret)
+ return ret;
+ } else if (mode == LP5521_CMD_DISABLED) {
+ lp5521_set_engine_mode(engine, LP5521_CMD_DISABLED);
+ }
+
+ /* remove load attribute from sysfs if not in load mode */
+ if (engine->mode == LP5521_CMD_LOAD && mode != LP5521_CMD_LOAD)
+ sysfs_remove_group(&dev->kobj, engine->attributes);
+
+ engine->mode = mode;
+
+ return ret;
+}
+
+static int lp5521_do_store_load(struct lp5521_engine *engine,
+ const char *buf, size_t len)
+{
+ struct lp5521_chip *chip = engine_to_lp5521(engine);
+ struct i2c_client *client = chip->client;
+ int ret, nrchars, offset = 0, i = 0;
+ char c[3];
+ unsigned cmd;
+ u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
+
+ while ((offset < len - 1) && (i < LP5521_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 = lp5521_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 lp5521_chip *chip = i2c_get_clientdata(client);
+ return lp5521_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 lp5521_chip *chip = i2c_get_clientdata(client);
+ switch (chip->engines[nr - 1].mode) {
+ case LP5521_CMD_RUN:
+ return sprintf(buf, "run\n");
+ case LP5521_CMD_LOAD:
+ return sprintf(buf, "load\n");
+ case LP5521_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 lp5521_chip *chip = i2c_get_clientdata(client);
+ struct lp5521_engine *engine = &chip->engines[nr - 1];
+ mutex_lock(&chip->lock);
+
+ if (!strncmp(buf, "run", 3))
+ lp5521_set_mode(engine, LP5521_CMD_RUN);
+ else if (!strncmp(buf, "load", 4))
+ lp5521_set_mode(engine, LP5521_CMD_LOAD);
+ else if (!strncmp(buf, "disabled", 8))
+ lp5521_set_mode(engine, LP5521_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 lp5521_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 lp5521_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 lp5521_led *led = cdev_to_led(led_cdev);
+ struct lp5521_chip *chip = led_to_lp5521(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 = lp5521_set_led_current(chip, led->id, curr);
+ mutex_unlock(&chip->lock);
+
+ if (ret < 0)
+ return ret;
+
+ led->led_current = (u8)curr;
+
+ return len;
+}
+
+static ssize_t lp5521_selftest(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+ int ret;
+
+ mutex_lock(&chip->lock);
+ ret = lp5521_run_selftest(chip, buf);
+ mutex_unlock(&chip->lock);
+ return sprintf(buf, "%s\n", ret ? "FAIL" : "OK");
+}
+
+/* led class device attributes */
+static DEVICE_ATTR(led_current, S_IRUGO | S_IWUGO, show_current, store_current);
+static DEVICE_ATTR(max_current, S_IRUGO , show_max_current, NULL);
+
+static struct attribute *lp5521_led_attributes[] = {
+ &dev_attr_led_current.attr,
+ &dev_attr_max_current.attr,
+ NULL,
+};
+
+static struct attribute_group lp5521_led_attribute_group = {
+ .attrs = lp5521_led_attributes
+};
+
+/* device attributes */
+static DEVICE_ATTR(engine1_mode, S_IRUGO | S_IWUGO,
+ show_engine1_mode, store_engine1_mode);
+static DEVICE_ATTR(engine2_mode, S_IRUGO | S_IWUGO,
+ show_engine2_mode, store_engine2_mode);
+static DEVICE_ATTR(engine3_mode, S_IRUGO | S_IWUGO,
+ show_engine3_mode, store_engine3_mode);
+static DEVICE_ATTR(engine1_load, S_IWUGO, NULL, store_engine1_load);
+static DEVICE_ATTR(engine2_load, S_IWUGO, NULL, store_engine2_load);
+static DEVICE_ATTR(engine3_load, S_IWUGO, NULL, store_engine3_load);
+static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
+
+static struct attribute *lp5521_attributes[] = {
+ &dev_attr_engine1_mode.attr,
+ &dev_attr_engine2_mode.attr,
+ &dev_attr_engine3_mode.attr,
+ &dev_attr_selftest.attr,
+ NULL
+};
+
+static struct attribute *lp5521_engine1_attributes[] = {
+ &dev_attr_engine1_load.attr,
+ NULL
+};
+
+static struct attribute *lp5521_engine2_attributes[] = {
+ &dev_attr_engine2_load.attr,
+ NULL
+};
+
+static struct attribute *lp5521_engine3_attributes[] = {
+ &dev_attr_engine3_load.attr,
+ NULL
+};
+
+static const struct attribute_group lp5521_group = {
+ .attrs = lp5521_attributes,
+};
+
+static const struct attribute_group lp5521_engine_group[] = {
+ {.attrs = lp5521_engine1_attributes },
+ {.attrs = lp5521_engine2_attributes },
+ {.attrs = lp5521_engine3_attributes },
+};
+
+static int lp5521_register_sysfs(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ return sysfs_create_group(&dev->kobj, &lp5521_group);
+}
+
+static void lp5521_unregister_sysfs(struct i2c_client *client)
+{
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+ struct device *dev = &client->dev;
+ int i;
+
+ sysfs_remove_group(&dev->kobj, &lp5521_group);
+
+ for (i = 0; i < ARRAY_SIZE(chip->engines); i++) {
+ if (chip->engines[i].mode == LP5521_CMD_LOAD)
+ sysfs_remove_group(&dev->kobj,
+ chip->engines[i].attributes);
+ }
+
+ for (i = 0; i < chip->num_leds; i++)
+ sysfs_remove_group(&chip->leds[i].cdev.dev->kobj,
+ &lp5521_led_attribute_group);
+}
+
+static int __init lp5521_init_led(struct lp5521_led *led,
+ struct i2c_client *client,
+ int chan, struct lp5521_platform_data *pdata)
+{
+ struct device *dev = &client->dev;
+ char name[32];
+ int res;
+
+ if (chan >= LP5521_MAX_LEDS)
+ return -EINVAL;
+
+ if (pdata->led_config[chan].led_current == 0)
+ return 0;
+
+ 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 >= LP5521_MAX_LEDS) {
+ dev_err(dev, "Use channel numbers between 0 and %d\n",
+ LP5521_MAX_LEDS - 1);
+ return -EINVAL;
+ }
+
+ snprintf(name, sizeof(name), "%s:channel%d", client->name, chan);
+ led->cdev.brightness_set = lp5521_set_brightness;
+ led->cdev.name = name;
+ 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,
+ &lp5521_led_attribute_group);
+ if (res < 0) {
+ dev_err(dev, "couldn't register current attribute\n");
+ led_classdev_unregister(&led->cdev);
+ return res;
+ }
+ return 0;
+}
+
+static int lp5521_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct lp5521_chip *chip;
+ struct lp5521_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, 10000);
+ pdata->enable(1);
+ usleep_range(1000, 10000); /* Spec says min 500us */
+ }
+
+ ret = lp5521_detect(client);
+
+ if (ret) {
+ dev_err(&client->dev, "Chip not found\n");
+ goto fail2;
+ }
+
+ dev_info(&client->dev, "%s programmable led chip found\n", id->name);
+
+ ret = lp5521_configure(client, lp5521_engine_group);
+ 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 = lp5521_init_led(&chip->leds[led], client, i, pdata);
+ if (ret) {
+ dev_err(&client->dev, "error initializing leds\n");
+ goto fail3;
+ }
+ chip->num_leds++;
+
+ chip->leds[led].id = led;
+ /* Set initial LED current */
+ lp5521_set_led_current(chip, led,
+ chip->leds[led].led_current);
+
+ INIT_WORK(&(chip->leds[led].brightness_work),
+ lp5521_led_brightness_work);
+
+ led++;
+ }
+
+ ret = lp5521_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 lp5521_remove(struct i2c_client *client)
+{
+ struct lp5521_chip *chip = i2c_get_clientdata(client);
+ int i;
+
+ lp5521_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 lp5521_id[] = {
+ { "lp5521", 0 }, /* Three channel chip */
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, lp5521_id);
+
+static struct i2c_driver lp5521_driver = {
+ .driver = {
+ .name = "lp5521",
+ },
+ .probe = lp5521_probe,
+ .remove = lp5521_remove,
+ .id_table = lp5521_id,
+};
+
+static int __init lp5521_init(void)
+{
+ int ret;
+
+ ret = i2c_add_driver(&lp5521_driver);
+
+ if (ret < 0)
+ printk(KERN_ALERT "Adding lp5521 driver failed\n");
+
+ return ret;
+}
+
+static void __exit lp5521_exit(void)
+{
+ i2c_del_driver(&lp5521_driver);
+}
+
+module_init(lp5521_init);
+module_exit(lp5521_exit);
+
+MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
+MODULE_DESCRIPTION("LP5521 LED engine");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/leds-lp5521.h b/include/linux/leds-lp5521.h
new file mode 100644
index 0000000..351bf30
--- /dev/null
+++ b/include/linux/leds-lp5521.h
@@ -0,0 +1,48 @@
+/*
+ * LP5521 LED chip 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
+ */
+
+#ifndef __LINUX_LP5521_H
+#define __LINUX_LP5521_H
+
+/* See Documentation/leds/leds-lp5521.txt */
+
+struct lp5521_led_config {
+ u8 chan_nr;
+ u8 led_current; /* mA x10, 0 if led is not connected */
+ u8 max_current;
+};
+
+#define LP5521_CLOCK_AUTO 0
+#define LP5521_CLOCK_INT 1
+#define LP5521_CLOCK_EXT 2
+
+struct lp5521_platform_data {
+ struct lp5521_led_config *led_config;
+ u8 num_channels;
+ u8 clock_mode;
+ int (*setup_resources)(void);
+ void (*release_resources)(void);
+ void (*enable)(bool state);
+};
+
+#endif /* __LINUX_LP5521_H */
+
--
1.6.0.4