Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752065AbaLaBSJ (ORCPT ); Tue, 30 Dec 2014 20:18:09 -0500 Received: from smtp1.cypress.com ([157.95.67.100]:60413 "EHLO smtp1.cypress.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751994AbaLaBSF (ORCPT ); Tue, 30 Dec 2014 20:18:05 -0500 From: Dudley Du To: dmitry.torokhov@gmail.com, jmmahler@gmail.com, rydberg@euromail.se Cc: Dudley Du , bleung@google.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v17 08/12] input: cyapa: add gen3 trackpad device force re-calibrate function support Date: Wed, 31 Dec 2014 09:16:57 +0800 Message-Id: <1419988621-2919-9-git-send-email-dudl@cypress.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1419988621-2919-1-git-send-email-dudl@cypress.com> References: <1419988621-2919-1-git-send-email-dudl@cypress.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add force re-calibrate function supported for gen3 trackpad device, it can be used through sysfs calibrate interface. TEST=test on Chromebooks. Signed-off-by: Dudley Du --- drivers/input/mouse/cyapa_gen3.c | 59 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/drivers/input/mouse/cyapa_gen3.c b/drivers/input/mouse/cyapa_gen3.c index 0cb52fa..c23b644 100644 --- a/drivers/input/mouse/cyapa_gen3.c +++ b/drivers/input/mouse/cyapa_gen3.c @@ -765,6 +765,64 @@ static int cyapa_gen3_do_fw_update(struct cyapa *cyapa, return 0; } +static ssize_t cyapa_gen3_do_calibrate(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct cyapa *cyapa = dev_get_drvdata(dev); + int tries; + int ret; + + ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS); + if (ret < 0) { + dev_err(dev, "Error reading dev status: %d\n", ret); + goto out; + } + if ((ret & CYAPA_DEV_NORMAL) != CYAPA_DEV_NORMAL) { + dev_warn(dev, "Trackpad device is busy, device state: 0x%02x\n", + ret); + ret = -EAGAIN; + goto out; + } + + ret = cyapa_write_byte(cyapa, CYAPA_CMD_SOFT_RESET, + OP_RECALIBRATION_MASK); + if (ret < 0) { + dev_err(dev, "Failed to send calibrate command: %d\n", + ret); + goto out; + } + + tries = 20; /* max recalibration timeout 2s. */ + do { + /* + * For this recalibration, the max time will not exceed 2s. + * The average time is approximately 500 - 700 ms, and we + * will check the status every 100 - 200ms. + */ + usleep_range(100000, 200000); + + ret = cyapa_read_byte(cyapa, CYAPA_CMD_DEV_STATUS); + if (ret < 0) { + dev_err(dev, "Error reading dev status: %d\n", + ret); + goto out; + } + if ((ret & CYAPA_DEV_NORMAL) == CYAPA_DEV_NORMAL) + break; + } while (--tries); + + if (tries == 0) { + dev_err(dev, "Failed to calibrate. Timeout.\n"); + ret = -ETIMEDOUT; + goto out; + } + dev_dbg(dev, "Calibration successful.\n"); + +out: + return ret < 0 ? ret : count; +} + static ssize_t cyapa_gen3_show_baseline(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1157,6 +1215,7 @@ const struct cyapa_dev_ops cyapa_gen3_ops = { .bl_initiate = cyapa_gen3_bl_initiate, .show_baseline = cyapa_gen3_show_baseline, + .calibrate_store = cyapa_gen3_do_calibrate, .initialize = cyapa_gen3_initialize, -- 1.9.1 -- 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/