From patchwork Wed Feb 26 15:28:00 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roger Quadros X-Patchwork-Id: 3725051 Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id ABE419F35F for ; Wed, 26 Feb 2014 15:29:48 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9A42A20155 for ; Wed, 26 Feb 2014 15:29:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7F7A220149 for ; Wed, 26 Feb 2014 15:29:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752532AbaBZP3a (ORCPT ); Wed, 26 Feb 2014 10:29:30 -0500 Received: from devils.ext.ti.com ([198.47.26.153]:39879 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753261AbaBZP2g (ORCPT ); Wed, 26 Feb 2014 10:28:36 -0500 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id s1QFSJsZ014170; Wed, 26 Feb 2014 09:28:19 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id s1QFSJo9014296; Wed, 26 Feb 2014 09:28:19 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.174.1; Wed, 26 Feb 2014 09:28:18 -0600 Received: from localhost.localdomain (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id s1QFSAC4027272; Wed, 26 Feb 2014 09:28:16 -0600 From: Roger Quadros To: CC: , , , , , , , , Roger Quadros Subject: [PATCH v2 2/8] Input: pixcir_i2c_ts: Initialize interrupt mode and power mode Date: Wed, 26 Feb 2014 17:28:00 +0200 Message-ID: <1393428486-15001-3-git-send-email-rogerq@ti.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1393428486-15001-1-git-send-email-rogerq@ti.com> References: <1393428486-15001-1-git-send-email-rogerq@ti.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Introduce helper functions to configure power and interrupt registers. Default to IDLE mode on probe as device supports auto wakeup to ACVIE mode on detecting finger touch. Configure interrupt mode and polarity on start up. Power down on device closure or module removal. Signed-off-by: Roger Quadros Acked-by: Mugunthan V N --- drivers/input/touchscreen/pixcir_i2c_ts.c | 173 +++++++++++++++++++++++++++++- include/linux/input/pixcir_ts.h | 42 ++++++++ 2 files changed, 213 insertions(+), 2 deletions(-) diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c index 38e83a2..cce3740 100644 --- a/drivers/input/touchscreen/pixcir_i2c_ts.c +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c @@ -100,6 +100,161 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id) return IRQ_HANDLED; } +static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts, + enum pixcir_power_mode mode) +{ + struct device *dev = &ts->client->dev; + int ret; + + ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE); + if (ret < 0) { + dev_err(dev, "%s: can't read reg 0x%x : %d\n", + __func__, PIXCIR_REG_POWER_MODE, ret); + return ret; + } + + ret &= ~PIXCIR_POWER_MODE_MASK; + ret |= mode; + + /* Always AUTO_IDLE */ + ret |= PIXCIR_POWER_ALLOW_IDLE; + + ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret); + if (ret < 0) { + dev_err(dev, "%s: can't write reg 0x%x : %d\n", + __func__, PIXCIR_REG_POWER_MODE, ret); + return ret; + } + + return 0; +} + +/* + * Set the interrupt mode for the device i.e. ATTB line behaviour + * + * @polarity : 1 for active high, 0 for active low. + */ +static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts, + enum pixcir_int_mode mode, + bool polarity) +{ + struct device *dev = &ts->client->dev; + int ret; + + ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE); + if (ret < 0) { + dev_err(dev, "%s: can't read reg 0x%x : %d\n", + __func__, PIXCIR_REG_INT_MODE, ret); + return ret; + } + + ret &= ~PIXCIR_INT_MODE_MASK; + ret |= mode; + + if (polarity) + ret |= PIXCIR_INT_POL_HIGH; + else + ret &= ~PIXCIR_INT_POL_HIGH; + + ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret); + if (ret < 0) { + dev_err(dev, "%s: can't write reg 0x%x : %d\n", + __func__, PIXCIR_REG_INT_MODE, ret); + return ret; + } + + return 0; +} + +/* + * Enable/disable interrupt generation + */ +static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable) +{ + struct device *dev = &ts->client->dev; + int ret; + + ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE); + if (ret < 0) { + dev_err(dev, "%s: can't read reg 0x%x : %d\n", + __func__, PIXCIR_REG_INT_MODE, ret); + return ret; + } + + if (enable) + ret |= PIXCIR_INT_ENABLE; + else + ret &= ~PIXCIR_INT_ENABLE; + + ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret); + if (ret < 0) { + dev_err(dev, "%s: can't write reg 0x%x : %d\n", + __func__, PIXCIR_REG_INT_MODE, ret); + return ret; + } + + return 0; +} + +static int pixcir_start(struct pixcir_i2c_ts_data *ts) +{ + struct device *dev = &ts->client->dev; + int ret; + + /* LEVEL_TOUCH interrupt with active low polarity */ + ret = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0); + if (ret) { + dev_err(dev, "Failed to set interrupt mode\n"); + return ret; + } + + ts->exiting = false; + mb(); /* Update status before IRQ can fire */ + + /* enable interrupt generation */ + ret = pixcir_int_enable(ts, 1); + if (ret) { + dev_err(dev, "Failed to enable interrupt generation\n"); + return ret; + } + + return 0; +} + +static int pixcir_stop(struct pixcir_i2c_ts_data *ts) +{ + struct device *dev = &ts->client->dev; + int ret; + + /* disable interrupt generation */ + ret = pixcir_int_enable(ts, 0); + if (ret) { + dev_err(dev, "Failed to disable interrupt generation\n"); + return ret; + } + + synchronize_irq(ts->client->irq); + mb(); /* Update status after pending IRQ is complete */ + ts->exiting = true; + + return 0; +} + +static int pixcir_input_open(struct input_dev *dev) +{ + struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev); + + return pixcir_start(ts); +} + +static void pixcir_input_close(struct input_dev *dev) +{ + struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev); + + pixcir_stop(ts); +} + + #ifdef CONFIG_PM_SLEEP static int pixcir_i2c_ts_suspend(struct device *dev) { @@ -157,6 +312,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, input->name = client->name; input->id.bustype = BUS_I2C; input->dev.parent = &client->dev; + input->open = pixcir_input_open; + input->close = pixcir_input_close; __set_bit(EV_KEY, input->evbit); __set_bit(EV_ABS, input->evbit); @@ -176,6 +333,18 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, return error; } + /* Always be in IDLE mode to save power, device supports auto wake */ + error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE); + if (error) { + dev_err(dev, "Failed to set IDLE mode\n"); + return error; + } + + /* Stop device till opened */ + error = pixcir_stop(tsdata); + if (error) + return error; + error = input_register_device(input); if (error) return error; @@ -192,8 +361,8 @@ static int pixcir_i2c_ts_remove(struct i2c_client *client) device_init_wakeup(&client->dev, 0); - tsdata->exiting = true; - mb(); + if (!tsdata->exiting) + pixcir_stop(tsdata); return 0; } diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h index 7163d91..7942804 100644 --- a/include/linux/input/pixcir_ts.h +++ b/include/linux/input/pixcir_ts.h @@ -1,6 +1,48 @@ #ifndef _PIXCIR_I2C_TS_H #define _PIXCIR_I2C_TS_H +/* + * Register map + */ +#define PIXCIR_REG_POWER_MODE 51 +#define PIXCIR_REG_INT_MODE 52 + +/* + * Power modes: + * active: max scan speed + * idle: lower scan speed with automatic transition to active on touch + * halt: datasheet says sleep but this is more like halt as the chip + * clocks are cut and it can only be brought out of this mode + * using the RESET pin. + */ +enum pixcir_power_mode { + PIXCIR_POWER_ACTIVE, + PIXCIR_POWER_IDLE, + PIXCIR_POWER_HALT, +}; + +#define PIXCIR_POWER_MODE_MASK 0x03 +#define PIXCIR_POWER_ALLOW_IDLE (1UL << 2) + +/* + * Interrupt modes: + * periodical: interrupt is asserted periodicaly + * diff coordinates: interrupt is asserted when coordinates change + * level on touch: interrupt level asserted during touch + * pulse on touch: interrupt pulse asserted druing touch + * + */ +enum pixcir_int_mode { + PIXCIR_INT_PERIODICAL, + PIXCIR_INT_DIFF_COORD, + PIXCIR_INT_LEVEL_TOUCH, + PIXCIR_INT_PULSE_TOUCH, +}; + +#define PIXCIR_INT_MODE_MASK 0x03 +#define PIXCIR_INT_ENABLE (1UL << 3) +#define PIXCIR_INT_POL_HIGH (1UL << 2) + struct pixcir_ts_platform_data { int (*attb_read_val)(void); int x_max;