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Date: Tue, 13 Aug 2013 13:58:06 -0700
From: Bryan Wu <cooloney@...il.com>
To: Milo Kim <woogyom.kim@...il.com>
Cc: Pali Rohár <pali.rohar@...il.com>,
Linux LED Subsystem <linux-leds@...r.kernel.org>,
lkml <linux-kernel@...r.kernel.org>, Milo Kim <milo.kim@...com>
Subject: Re: [PATCH 07/10] leds: lp5523: restore legacy device attributes
On Thu, Aug 8, 2013 at 12:59 AM, Milo Kim <woogyom.kim@...il.com> wrote:
> git commit db6eaf8388a413a5ee1b4547ce78506b9c6456b0
> (leds-lp5523: use generic firmware interface) causes an application conflict.
> This interface should be maintained for compatibility.
>
> Restored device attributes are 'engineN_mode', 'engineN_load' and
> 'engineN_leds'. (N = 1, 2 or 3)
> A 'selftest' attribute macro is replaced with LP55xx common macro.
> Those are accessed when a LED pattern is run by an application.
>
> Use a mutex in lp5523_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, lp5523_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.
>
Good, I will merge this.
-Bryan
> Reported-by: Pali Rohár <pali.rohar@...il.com>
> Signed-off-by: Milo Kim <milo.kim@...com>
> ---
> drivers/leds/leds-lp5523.c | 227 +++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 223 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
> index 29c8b19..9b8be6f6 100644
> --- a/drivers/leds/leds-lp5523.c
> +++ b/drivers/leds/leds-lp5523.c
> @@ -74,6 +74,9 @@
> #define LP5523_PAGE_ENG1 0
> #define LP5523_PAGE_ENG2 1
> #define LP5523_PAGE_ENG3 2
> +#define LP5523_PAGE_MUX1 3
> +#define LP5523_PAGE_MUX2 4
> +#define LP5523_PAGE_MUX3 5
>
> /* Program Memory Operations */
> #define LP5523_MODE_ENG1_M 0x30 /* Operation Mode Register */
> @@ -98,6 +101,8 @@
> #define LP5523_RUN_ENG2 0x08
> #define LP5523_RUN_ENG3 0x02
>
> +#define LED_ACTIVE(mux, led) (!!(mux & (0x0001 << led)))
> +
> enum lp5523_chip_id {
> LP5523,
> LP55231,
> @@ -338,10 +343,20 @@ static int lp5523_update_program_memory(struct lp55xx_chip *chip,
> goto err;
>
> update_size = i;
> - for (i = 0; i < update_size; i++)
> - lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
>
> - return 0;
> + mutex_lock(&chip->lock);
> +
> + for (i = 0; i < update_size; i++) {
> + ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 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");
> @@ -368,6 +383,192 @@ static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
> lp5523_update_program_memory(chip, fw->data, fw->size);
> }
>
> +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)) {
> + lp5523_run_engine(chip, true);
> + engine->mode = LP55XX_ENGINE_RUN;
> + } else if (!strncmp(buf, "load", 4)) {
> + lp5523_stop_engine(chip);
> + lp5523_load_engine(chip);
> + engine->mode = LP55XX_ENGINE_LOAD;
> + } else if (!strncmp(buf, "disabled", 8)) {
> + lp5523_stop_engine(chip);
> + engine->mode = LP55XX_ENGINE_DISABLED;
> + }
> +
> + mutex_unlock(&chip->lock);
> +
> + return len;
> +}
> +store_mode(1)
> +store_mode(2)
> +store_mode(3)
> +
> +static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
> +{
> + u16 tmp_mux = 0;
> + int i;
> +
> + 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;
> + }
> + }
> + *mux = tmp_mux;
> +
> + return 0;
> +}
> +
> +static void lp5523_mux_to_array(u16 led_mux, char *array)
> +{
> + int i, pos = 0;
> + for (i = 0; i < LP5523_MAX_LEDS; i++)
> + pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
> +
> + array[pos] = '\0';
> +}
> +
> +static ssize_t show_engine_leds(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;
> + char mux[LP5523_MAX_LEDS + 1];
> +
> + lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
> +
> + return sprintf(buf, "%s\n", mux);
> +}
> +show_leds(1)
> +show_leds(2)
> +show_leds(3)
> +
> +static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
> +{
> + struct lp55xx_engine *engine = &chip->engines[nr - 1];
> + int ret;
> + u8 mux_page[] = {
> + [LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
> + [LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
> + [LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
> + };
> +
> + lp5523_load_engine(chip);
> +
> + ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
> + if (ret)
> + return ret;
> +
> + ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
> + if (ret)
> + return ret;
> +
> + ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
> + if (ret)
> + return ret;
> +
> + engine->led_mux = mux;
> + return 0;
> +}
> +
> +static ssize_t store_engine_leds(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];
> + u16 mux = 0;
> + ssize_t ret;
> +
> + if (lp5523_mux_parse(buf, &mux, len))
> + return -EINVAL;
> +
> + mutex_lock(&chip->lock);
> +
> + chip->engine_idx = nr;
> + ret = -EINVAL;
> +
> + if (engine->mode != LP55XX_ENGINE_LOAD)
> + goto leave;
> +
> + if (lp5523_load_mux(chip, mux, nr))
> + goto leave;
> +
> + ret = len;
> +leave:
> + mutex_unlock(&chip->lock);
> + return ret;
> +}
> +store_leds(1)
> +store_leds(2)
> +store_leds(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;
> + lp5523_load_engine_and_select_page(chip);
> +
> + mutex_unlock(&chip->lock);
> +
> + return lp5523_update_program_memory(chip, buf, len);
> +}
> +store_load(1)
> +store_load(2)
> +store_load(3)
> +
> static ssize_t lp5523_selftest(struct device *dev,
> struct device_attribute *attr,
> char *buf)
> @@ -467,9 +668,27 @@ static void lp5523_led_brightness_work(struct work_struct *work)
> mutex_unlock(&chip->lock);
> }
>
> -static DEVICE_ATTR(selftest, S_IRUGO, lp5523_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_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
> +static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
> +static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
> +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, lp5523_selftest);
>
> static struct attribute *lp5523_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_engine1_leds.attr,
> + &dev_attr_engine2_leds.attr,
> + &dev_attr_engine3_leds.attr,
> &dev_attr_selftest.attr,
> NULL,
> };
> --
> 1.7.9.5
>
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