On Thu, Sep 16, 2010 at 01:12:23PM +0300, Samu Onkalo wrote:
> 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 <[email protected]>
> ---
> drivers/leds/leds-lp5521.c | 820
> +++++++++++++++++++++++++++++++++++++++++++
> include/linux/leds-lp5521.h | 46 +++
> 2 files changed, 866 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..f57adb0
> --- /dev/null
> +++ b/drivers/leds/leds-lp5521.c
> @@ -0,0 +1,820 @@
> +/*
> + * LP5521 LED chip driver.
> + *
> + * Copyright (C) 2010 Nokia Corporation
> + *
> + * Contact: Samu Onkalo <[email protected]>
> + *
> + * 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 < LP5521_MAX_ENGINES; i++) {
you could use ARRAY_SIZE(chip->engines) ?
> + 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 ssize_t 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)
> + goto fail;
> +
> + /* 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)
> + goto fail;
> +
> + return sprintf(buf, "OK\n");
> +fail:
> + return sprintf(buf, "FAIL\n");
> +}
why not return an error code here?
> +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++;
> + }
> +
> + /* Pattern commands are always two bytes long */
> + 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);
> + ssize_t ret = 0;
> +
> + mutex_lock(&chip->lock);
> + ret = lp5521_run_selftest(chip, buf);
> + mutex_unlock(&chip->lock);
> + return ret;
> +}
> +
> +/* 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 < LP5521_MAX_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;
> +
> + 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;
> +
> + chip->num_leds++;
> + ret = lp5521_init_led(&chip->leds[led], client, i, pdata);
> + if (ret) {
> + dev_err(&client->dev, "error initializing leds\n");
> + goto fail3;
> + }
> +
> + 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..2d3aca2
> --- /dev/null
> +++ b/include/linux/leds-lp5521.h
> @@ -0,0 +1,46 @@
> +/*
> + * LP5521 LED chip driver.
> + *
> + * Copyright (C) 2010 Nokia Corporation
> + *
> + * Contact: Samu Onkalo <[email protected]>
> + *
> + * 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
> +
> +struct lp5521_led_config {
> + u8 chan_nr;
> + u8 led_current; /* mA x10, 0 if led is not connected */
> + u8 max_current;
> +};
documentation would be useful. kerneldoc fo preference.
> +#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
>
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