From patchwork Wed Jun 5 17:37:16 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nick Dyer X-Patchwork-Id: 2672641 Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 3E8B83FD4F for ; Wed, 5 Jun 2013 17:59:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932090Ab3FER7W (ORCPT ); Wed, 5 Jun 2013 13:59:22 -0400 Received: from kdh-gw.itdev.co.uk ([89.21.227.133]:58712 "EHLO hermes.kdh.itdev.co.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1757089Ab3FERsM (ORCPT ); Wed, 5 Jun 2013 13:48:12 -0400 Received: from juno.kdh.itdev.co.uk (juno.kdh.itdev.co.uk [192.168.1.125]) by hermes.kdh.itdev.co.uk (Postfix) with ESMTP id D182C84E0E; Wed, 5 Jun 2013 18:37:55 +0100 (BST) From: Nick Dyer To: Dmitry Torokhov , Daniel Kurtz , Henrik Rydberg , Joonyoung Shim , Alan.Bowens@atmel.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, pmeerw@pmeerw.net, bleung@chromium.org, olofj@chromium.org Cc: Nick Dyer Subject: [PATCH 23/53] Input: atmel_mxt_ts - Use deep sleep mode when stopped Date: Wed, 5 Jun 2013 18:37:16 +0100 Message-Id: <1370453866-16534-24-git-send-email-nick.dyer@itdev.co.uk> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1370453866-16534-1-git-send-email-nick.dyer@itdev.co.uk> References: <1370453866-16534-1-git-send-email-nick.dyer@itdev.co.uk> Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org By writing zero to both the active and idle cycle times the maXTouch device is put into a deep sleep mode when it consumes minimal power. It is unnecessary to change the configuration of any other objects (for example to disable T9 touchscreen). It is counterproductive to reset the chip on resume, it will result in a long delay. However it is necessary to issue a calibrate command after the chip has spent any time in deep sleep. This patch also deals with the situation where the power configuration is zero on probe, which would mean that the device never wakes up to execute commands. Signed-off-by: Nick Dyer Acked-by: Benson Leung --- drivers/input/touchscreen/atmel_mxt_ts.c | 100 ++++++++++++++++++++++-------- 1 file changed, 74 insertions(+), 26 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 41ec122..b3fe56c 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -93,9 +93,13 @@ #define MXT_T6_STATUS_RESET (1 << 7) /* MXT_GEN_POWER_T7 field */ -#define MXT_POWER_IDLEACQINT 0 -#define MXT_POWER_ACTVACQINT 1 -#define MXT_POWER_ACTV2IDLETO 2 +struct t7_config { + u8 idle; + u8 active; +} __packed; + +#define MXT_POWER_CFG_RUN 0 +#define MXT_POWER_CFG_DEEPSLEEP 1 /* MXT_GEN_ACQUIRE_T8 field */ #define MXT_ACQUIRE_CHRGTIME 0 @@ -107,7 +111,6 @@ #define MXT_ACQUIRE_ATCHCALSTHR 7 /* MXT_TOUCH_MULTI_T9 field */ -#define MXT_TOUCH_CTRL 0 #define MXT_T9_ORIENT 9 #define MXT_T9_RANGE 18 @@ -248,6 +251,7 @@ struct mxt_data { u32 config_crc; u32 info_crc; u8 bootloader_addr; + struct t7_config t7_cfg; /* Cached parameters from object table */ u8 T6_reportid; @@ -608,20 +612,6 @@ static int mxt_read_message(struct mxt_data *data, sizeof(struct mxt_message), message); } -static int mxt_write_object(struct mxt_data *data, - u8 type, u8 offset, u8 val) -{ - struct mxt_object *object; - u16 reg; - - object = mxt_get_object(data, type); - if (!object || offset >= mxt_obj_size(object)) - return -EINVAL; - - reg = object->start_address; - return mxt_write_reg(data->client, reg + offset, val); -} - static void mxt_input_button(struct mxt_data *data, struct mxt_message *message) { struct input_dev *input = data->input_dev; @@ -1142,6 +1132,61 @@ release: return ret; } +static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep) +{ + struct device *dev = &data->client->dev; + int error; + struct t7_config *new_config; + struct t7_config deepsleep = { .active = 0, .idle = 0 }; + + if (sleep == MXT_POWER_CFG_DEEPSLEEP) + new_config = &deepsleep; + else + new_config = &data->t7_cfg; + + error = __mxt_write_reg(data->client, data->T7_address, + sizeof(data->t7_cfg), + new_config); + if (error) + return error; + + dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n", + new_config->active, new_config->idle); + + return 0; +} + +static int mxt_init_t7_power_cfg(struct mxt_data *data) +{ + struct device *dev = &data->client->dev; + int error; + bool retry = false; + +recheck: + error = __mxt_read_reg(data->client, data->T7_address, + sizeof(data->t7_cfg), &data->t7_cfg); + if (error) + return error; + + if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) { + if (!retry) { + dev_info(dev, "T7 cfg zero, resetting\n"); + mxt_soft_reset(data); + retry = true; + goto recheck; + } else { + dev_dbg(dev, "T7 cfg zero after reset, overriding\n"); + data->t7_cfg.active = 20; + data->t7_cfg.idle = 100; + return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN); + } + } else { + dev_info(dev, "Initialised power cfg: ACTV %d, IDLE %d\n", + data->t7_cfg.active, data->t7_cfg.idle); + return 0; + } +} + static int mxt_make_highchg(struct mxt_data *data) { struct device *dev = &data->client->dev; @@ -1354,6 +1399,12 @@ static int mxt_initialize(struct mxt_data *data) goto err_free_object_table; } + error = mxt_init_t7_power_cfg(data); + if (error) { + dev_err(&client->dev, "Failed to initialize power cfg\n"); + goto err_free_object_table; + } + error = mxt_read_t9_resolution(data); if (error) { dev_err(&client->dev, "Failed to initialize T9 resolution\n"); @@ -1701,16 +1752,15 @@ static const struct attribute_group mxt_attr_group = { static void mxt_start(struct mxt_data *data) { - /* Touch enable */ - mxt_write_object(data, - MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0x83); + mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN); + + /* Recalibrate since chip has been in deep sleep */ + mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false); } static void mxt_stop(struct mxt_data *data) { - /* Touch disable */ - mxt_write_object(data, - MXT_TOUCH_MULTI_T9, MXT_TOUCH_CTRL, 0); + mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP); } static int mxt_input_open(struct input_dev *dev) @@ -1943,8 +1993,6 @@ static int mxt_resume(struct device *dev) struct mxt_data *data = i2c_get_clientdata(client); struct input_dev *input_dev = data->input_dev; - mxt_soft_reset(data); - mutex_lock(&input_dev->mutex); if (input_dev->users)