Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753926Ab1CJASj (ORCPT ); Wed, 9 Mar 2011 19:18:39 -0500 Received: from hqemgate03.nvidia.com ([216.228.121.140]:9385 "EHLO hqemgate03.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753103Ab1CJASi (ORCPT ); Wed, 9 Mar 2011 19:18:38 -0500 X-PGP-Universal: processed; by hqnvupgp07.nvidia.com on Wed, 09 Mar 2011 16:18:37 -0800 From: rklein@nvidia.com To: Anton Vorontsov Cc: olof@lixom.net, linux-kernel@vger.kernel.org, Rhyland Klein Subject: [PATCH] power: bq20z75: fix issues with present and suspend Date: Wed, 9 Mar 2011 16:18:02 -0800 Message-Id: <1299716282-21857-1-git-send-email-rklein@nvidia.com> X-Mailer: git-send-email 1.7.0.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4575 Lines: 136 From: Rhyland Klein There are a few issues found around the battery not being present. If the battery isn't present, then a few undesirable things happen. The first was excessive reporting of failed properties. This was fixed by instead returning ENODATA for all properties other than PRESENT if the battery isn't present. That way the callers can identify the difference between a failure and the battery not being there. The next issue was in the suspend logic. It was found that if the battery wasn't present, then it would return a failure, preventing the system from going into suspend. If there is no battery present, the io is expected to fail, so in that case, we shouldn't return the failure and just acknowledge that it was expected. I also found that when a gpio was used, i didn't maintain the internal is_present state properly. I added a set of that to fix that. Lastly, the code to see io's fail and figure out that the battery isn't present when not using a gpio had a problem. In that code, it looked for the read to fail and if it did, then handled it. The problem is that in function to get the property, it first writes a value and that write can fail, causing the code to never reach the logic after the read. Fix is to move the logic till after the write. Change-Id: I09c9a9f0c1f0bcbad2308b6ffc65f6823d6a7ad0 Signed-off-by: Rhyland Klein --- drivers/power/bq20z75.c | 32 +++++++++++++++++++++----------- 1 files changed, 21 insertions(+), 11 deletions(-) diff --git a/drivers/power/bq20z75.c b/drivers/power/bq20z75.c index 8018e8c..5615c92 100644 --- a/drivers/power/bq20z75.c +++ b/drivers/power/bq20z75.c @@ -171,7 +171,7 @@ static int bq20z75_read_word_data(struct i2c_client *client, u8 address) } if (ret < 0) { - dev_warn(&client->dev, + dev_dbg(&client->dev, "%s: i2c read at address 0x%x failed\n", __func__, address); return ret; @@ -199,7 +199,7 @@ static int bq20z75_write_word_data(struct i2c_client *client, u8 address, } if (ret < 0) { - dev_warn(&client->dev, + dev_dbg(&client->dev, "%s: i2c write to address 0x%x failed\n", __func__, address); return ret; @@ -223,6 +223,7 @@ static int bq20z75_get_battery_presence_and_health( val->intval = 1; else val->intval = 0; + bq20z75_device->is_present = val->intval; return ret; } @@ -232,18 +233,17 @@ static int bq20z75_get_battery_presence_and_health( ret = bq20z75_write_word_data(client, bq20z75_data[REG_MANUFACTURER_DATA].addr, MANUFACTURER_ACCESS_STATUS); - if (ret < 0) - return ret; - - - ret = bq20z75_read_word_data(client, - bq20z75_data[REG_MANUFACTURER_DATA].addr); if (ret < 0) { if (psp == POWER_SUPPLY_PROP_PRESENT) val->intval = 0; /* battery removed */ return ret; } + ret = bq20z75_read_word_data(client, + bq20z75_data[REG_MANUFACTURER_DATA].addr); + if (ret < 0) + return ret; + if (ret < bq20z75_data[REG_MANUFACTURER_DATA].min_value || ret > bq20z75_data[REG_MANUFACTURER_DATA].max_value) { val->intval = 0; @@ -455,6 +455,8 @@ static int bq20z75_get_property(struct power_supply *psy, case POWER_SUPPLY_PROP_PRESENT: case POWER_SUPPLY_PROP_HEALTH: ret = bq20z75_get_battery_presence_and_health(client, psp, val); + if (psp == POWER_SUPPLY_PROP_PRESENT) + return 0; break; case POWER_SUPPLY_PROP_TECHNOLOGY: @@ -516,9 +518,16 @@ done: } dev_dbg(&client->dev, - "%s: property = %d, value = %d\n", __func__, psp, val->intval); + "%s: property = %d, value = %x\n", __func__, psp, val->intval); + + if (ret && bq20z75_device->is_present) + return ret; + + /* battery not present, so return NODATA for properties */ + if (ret) + return -ENODATA; - return ret; + return 0; } static irqreturn_t bq20z75_irq(int irq, void *devid) @@ -643,13 +652,14 @@ static int __devexit bq20z75_remove(struct i2c_client *client) static int bq20z75_suspend(struct i2c_client *client, pm_message_t state) { + struct bq20z75_info *bq20z75_device = i2c_get_clientdata(client); s32 ret; /* write to manufacturer access with sleep command */ ret = bq20z75_write_word_data(client, bq20z75_data[REG_MANUFACTURER_DATA].addr, MANUFACTURER_ACCESS_SLEEP); - if (ret < 0) + if (bq20z75_device->is_present && ret < 0) return ret; return 0; -- 1.7.0.4 -- 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/