Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934028Ab3HHIAq (ORCPT ); Thu, 8 Aug 2013 04:00:46 -0400 Received: from mail-pa0-f43.google.com ([209.85.220.43]:60713 "EHLO mail-pa0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757738Ab3HHIAn (ORCPT ); Thu, 8 Aug 2013 04:00:43 -0400 From: Milo Kim To: Bryan Wu Cc: =?UTF-8?q?Pali=20Roh=C3=A1r?= , linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org, Milo Kim Subject: [PATCH 07/10] leds: lp5523: restore legacy device attributes Date: Thu, 8 Aug 2013 16:59:51 +0900 Message-Id: <1375948794-6286-8-git-send-email-milo.kim@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1375948794-6286-1-git-send-email-milo.kim@ti.com> References: <1375948794-6286-1-git-send-email-milo.kim@ti.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8382 Lines: 302 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. Reported-by: Pali Rohár Signed-off-by: Milo Kim --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/