diff options
| -rw-r--r-- | drivers/leds/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/leds/leds-lp55xx-common.c | 117 | ||||
| -rw-r--r-- | drivers/leds/leds-lp55xx-common.h | 19 |
3 files changed, 137 insertions, 0 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 3d7822b3498f..fc680a9ed841 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -196,6 +196,7 @@ config LEDS_LP3944 config LEDS_LP55XX_COMMON tristate "Common Driver for TI/National LP5521 and LP5523/55231" depends on LEDS_LP5521 || LEDS_LP5523 + select FW_LOADER help This option supports common operations for LP5521 and LP5523/55231 devices. diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c index 98407ca45e4f..578902ab604f 100644 --- a/drivers/leds/leds-lp55xx-common.c +++ b/drivers/leds/leds-lp55xx-common.c @@ -13,6 +13,7 @@ */ #include <linux/delay.h> +#include <linux/firmware.h> #include <linux/i2c.h> #include <linux/leds.h> #include <linux/module.h> @@ -197,7 +198,123 @@ static int lp55xx_init_led(struct lp55xx_led *led, return 0; } +static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) +{ + struct lp55xx_chip *chip = context; + struct device *dev = &chip->cl->dev; + + if (!fw) { + dev_err(dev, "firmware request failed\n"); + goto out; + } + + /* handling firmware data is chip dependent */ + mutex_lock(&chip->lock); + + chip->fw = fw; + if (chip->cfg->firmware_cb) + chip->cfg->firmware_cb(chip); + + mutex_unlock(&chip->lock); + +out: + /* firmware should be released for other channel use */ + release_firmware(chip->fw); +} + +static int lp55xx_request_firmware(struct lp55xx_chip *chip) +{ + const char *name = chip->cl->name; + struct device *dev = &chip->cl->dev; + + return request_firmware_nowait(THIS_MODULE, true, name, dev, + GFP_KERNEL, chip, lp55xx_firmware_loaded); +} + +static ssize_t lp55xx_show_engine_select(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); + struct lp55xx_chip *chip = led->chip; + + return sprintf(buf, "%d\n", chip->engine_idx); +} + +static ssize_t lp55xx_store_engine_select(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); + struct lp55xx_chip *chip = led->chip; + unsigned long val; + int ret; + + if (kstrtoul(buf, 0, &val)) + return -EINVAL; + + /* select the engine to be run */ + + switch (val) { + case LP55XX_ENGINE_1: + case LP55XX_ENGINE_2: + case LP55XX_ENGINE_3: + mutex_lock(&chip->lock); + chip->engine_idx = val; + ret = lp55xx_request_firmware(chip); + mutex_unlock(&chip->lock); + break; + default: + dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val); + return -EINVAL; + } + + if (ret) { + dev_err(dev, "request firmware err: %d\n", ret); + return ret; + } + + return len; +} + +static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start) +{ + if (chip->cfg->run_engine) + chip->cfg->run_engine(chip, start); +} + +static ssize_t lp55xx_store_engine_run(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); + struct lp55xx_chip *chip = led->chip; + unsigned long val; + + if (kstrtoul(buf, 0, &val)) + return -EINVAL; + + /* run or stop the selected engine */ + + if (val <= 0) { + lp55xx_run_engine(chip, false); + return len; + } + + mutex_lock(&chip->lock); + lp55xx_run_engine(chip, true); + mutex_unlock(&chip->lock); + + return len; +} + +static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR, + lp55xx_show_engine_select, lp55xx_store_engine_select); +static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run); + static struct attribute *lp55xx_engine_attributes[] = { + &dev_attr_select_engine.attr, + &dev_attr_run_engine.attr, NULL, }; diff --git a/drivers/leds/leds-lp55xx-common.h b/drivers/leds/leds-lp55xx-common.h index d0be837643f0..8473abf9830c 100644 --- a/drivers/leds/leds-lp55xx-common.h +++ b/drivers/leds/leds-lp55xx-common.h @@ -15,6 +15,13 @@ #ifndef _LEDS_LP55XX_COMMON_H #define _LEDS_LP55XX_COMMON_H +enum lp55xx_engine_index { + LP55XX_ENGINE_INVALID, + LP55XX_ENGINE_1, + LP55XX_ENGINE_2, + LP55XX_ENGINE_3, +}; + struct lp55xx_led; struct lp55xx_chip; @@ -36,6 +43,8 @@ struct lp55xx_reg { * @post_init_device : Chip specific initialization code * @brightness_work_fn : Brightness work function * @set_led_current : LED current set function + * @firmware_cb : Call function when the firmware is loaded + * @run_engine : Run internal engine for pattern */ struct lp55xx_device_config { const struct lp55xx_reg reset; @@ -50,6 +59,12 @@ struct lp55xx_device_config { /* current setting function */ void (*set_led_current) (struct lp55xx_led *led, u8 led_current); + + /* access program memory when the firmware is loaded */ + void (*firmware_cb)(struct lp55xx_chip *chip); + + /* used for running firmware LED patterns */ + void (*run_engine) (struct lp55xx_chip *chip, bool start); }; /* @@ -59,6 +74,8 @@ struct lp55xx_device_config { * @lock : Lock for user-space interface * @num_leds : Number of registered LEDs * @cfg : Device specific configuration data + * @engine_idx : Selected engine number + * @fw : Firmware data for running a LED pattern */ struct lp55xx_chip { struct i2c_client *cl; @@ -66,6 +83,8 @@ struct lp55xx_chip { struct mutex lock; /* lock for user-space interface */ int num_leds; struct lp55xx_device_config *cfg; + enum lp55xx_engine_index engine_idx; + const struct firmware *fw; }; /* |