leds: lp5521: restore legacy device attributes

git commit 9ce7cb170f97f83a78dc948bf7d25690f15e1328
may cause an application confict, engineN_mode and engineN_load.
This interface should be maintained for compatibility.

Restored device attributes are 'engineN_mode' and 'engineN_load'.
A 'selftest' attribute macro is replaced with LP55xx common macro.

Use a mutex in lp5521_update_program_memory()
: This function is called when an user-application writes a 'engineN_load' file
or pattern data is loaded from generic firmware interface.
So, writing program memory should be protected.
If an error occurs on accessing this area, just it returns as -EINVAL quickly.
This error code is exact same as old driver function, lp5521_do_store_load()
because it should be kept for an user-application compatibility.
Even the driver is changed, we can use the application without re-compiling
sources.

'led_pattern' attribute is not included
: engineN_mode and _load were created for custom user-application.
'led_pattern' is an exception. I added this attribute not for custom application
but for simple test. Now it is used only in LP5562 driver, not LP5521.

Signed-off-by: Milo Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

1 files changed, 100 insertions, 4 deletions

diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index 9e28dd073e26..c00f922163b3 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -251,10 +251,20 @@ static int lp5521_update_program_memory(struct lp55xx_chip *chip,
                 goto err;
 
         program_size = i;
-        for (i = 0; i < program_size; i++)
-                lp55xx_write(chip, addr[idx] + i, pattern[i]);
 
-        return 0;
+        mutex_lock(&chip->lock);
+
+        for (i = 0; i < program_size; i++) {
+                ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
+                if (ret) {
+                        mutex_unlock(&chip->lock);
+                        return -EINVAL;
+                }
+        }
+
+        mutex_unlock(&chip->lock);
+
+        return size;
 
 err:
         dev_err(&chip->cl->dev, "wrong pattern format\n");
@@ -365,6 +375,80 @@ static void lp5521_led_brightness_work(struct work_struct *work)
         mutex_unlock(&chip->lock);
 }
 
+static ssize_t show_engine_mode(struct device *dev,
+                                struct device_attribute *attr,
+                                char *buf, int nr)
+{
+        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+        struct lp55xx_chip *chip = led->chip;
+        enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
+
+        switch (mode) {
+        case LP55XX_ENGINE_RUN:
+                return sprintf(buf, "run\n");
+        case LP55XX_ENGINE_LOAD:
+                return sprintf(buf, "load\n");
+        case LP55XX_ENGINE_DISABLED:
+        default:
+                return sprintf(buf, "disabled\n");
+        }
+}
+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 lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+        struct lp55xx_chip *chip = led->chip;
+        struct lp55xx_engine *engine = &chip->engines[nr - 1];
+
+        mutex_lock(&chip->lock);
+
+        chip->engine_idx = nr;
+
+        if (!strncmp(buf, "run", 3)) {
+                lp5521_run_engine(chip, true);
+                engine->mode = LP55XX_ENGINE_RUN;
+        } else if (!strncmp(buf, "load", 4)) {
+                lp5521_stop_engine(chip);
+                lp5521_load_engine(chip);
+                engine->mode = LP55XX_ENGINE_LOAD;
+        } else if (!strncmp(buf, "disabled", 8)) {
+                lp5521_stop_engine(chip);
+                engine->mode = LP55XX_ENGINE_DISABLED;
+        }
+
+        mutex_unlock(&chip->lock);
+
+        return len;
+}
+store_mode(1)
+store_mode(2)
+store_mode(3)
+
+static ssize_t store_engine_load(struct device *dev,
+                             struct device_attribute *attr,
+                             const char *buf, size_t len, int nr)
+{
+        struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+        struct lp55xx_chip *chip = led->chip;
+
+        mutex_lock(&chip->lock);
+
+        chip->engine_idx = nr;
+        lp5521_load_engine(chip);
+
+        mutex_unlock(&chip->lock);
+
+        return lp5521_update_program_memory(chip, buf, len);
+}
+store_load(1)
+store_load(2)
+store_load(3)
+
 static ssize_t lp5521_selftest(struct device *dev,
                                struct device_attribute *attr,
                                char *buf)
@@ -381,9 +465,21 @@ static ssize_t lp5521_selftest(struct device *dev,
 }
 
 /* device attributes */
-static DEVICE_ATTR(selftest, S_IRUGO, lp5521_selftest, NULL);
+static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
+static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
+static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
+static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
+static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
+static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
+static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
 
 static struct attribute *lp5521_attributes[] = {
+        &dev_attr_engine1_mode.attr,
+        &dev_attr_engine2_mode.attr,
+        &dev_attr_engine3_mode.attr,
+        &dev_attr_engine1_load.attr,
+        &dev_attr_engine2_load.attr,
+        &dev_attr_engine3_load.attr,
         &dev_attr_selftest.attr,
         NULL
 };