From patchwork Tue May 6 11:06:07 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roger Quadros X-Patchwork-Id: 4120491 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 9F41C9F1E1 for ; Tue, 6 May 2014 11:08:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 90F032015E for ; Tue, 6 May 2014 11:08:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6C776201FB for ; Tue, 6 May 2014 11:08:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934900AbaEFLGg (ORCPT ); Tue, 6 May 2014 07:06:36 -0400 Received: from arroyo.ext.ti.com ([192.94.94.40]:52079 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934886AbaEFLGd (ORCPT ); Tue, 6 May 2014 07:06:33 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id s46B6TQq021368; Tue, 6 May 2014 06:06:29 -0500 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 s46B6T5M019174; Tue, 6 May 2014 06:06:29 -0500 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; Tue, 6 May 2014 06:06:29 -0500 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 s46B6Kf7021055; Tue, 6 May 2014 06:06:26 -0500 From: Roger Quadros To: CC: , , , , , , , , Roger Quadros Subject: [PATCH v5 2/7] Input: pixcir_i2c_ts - initialize interrupt mode and power mode Date: Tue, 6 May 2014 14:06:07 +0300 Message-ID: <1399374372-29123-3-git-send-email-rogerq@ti.com> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1399374372-29123-1-git-send-email-rogerq@ti.com> References: <1399374372-29123-1-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=-7.5 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 Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/pixcir_i2c_ts.c | 182 ++++++++++++++++++++++++++++-- include/linux/input/pixcir_ts.h | 42 +++++++ 2 files changed, 216 insertions(+), 8 deletions(-) diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c index 8a083bd..96a1b1e 100644 --- a/drivers/input/touchscreen/pixcir_i2c_ts.c +++ b/drivers/input/touchscreen/pixcir_i2c_ts.c @@ -29,7 +29,7 @@ struct pixcir_i2c_ts_data { struct i2c_client *client; struct input_dev *input; const struct pixcir_ts_platform_data *chip; - bool exiting; + bool running; }; static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data) @@ -88,7 +88,7 @@ static irqreturn_t pixcir_ts_isr(int irq, void *dev_id) { struct pixcir_i2c_ts_data *tsdata = dev_id; - while (!tsdata->exiting) { + while (tsdata->running) { pixcir_ts_poscheck(tsdata); if (tsdata->chip->attb_read_val()) @@ -100,6 +100,164 @@ 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 error; + + /* LEVEL_TOUCH interrupt with active low polarity */ + error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0); + if (error) { + dev_err(dev, "Failed to set interrupt mode: %d\n", error); + return error; + } + + ts->running = true; + mb(); /* Update status before IRQ can fire */ + + /* enable interrupt generation */ + error = pixcir_int_enable(ts, true); + if (error) { + dev_err(dev, "Failed to enable interrupt generation: %d\n", + error); + return error; + } + + return 0; +} + +static int pixcir_stop(struct pixcir_i2c_ts_data *ts) +{ + int error; + + /* Disable interrupt generation */ + error = pixcir_int_enable(ts, false); + if (error) { + dev_err(&ts->client->dev, + "Failed to disable interrupt generation: %d\n", + error); + return error; + } + + /* Exit ISR if running, no more report parsing */ + ts->running = false; + mb(); /* update status before we synchronize irq */ + + /* Wait till running ISR is complete */ + synchronize_irq(ts->client->irq); + + 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) { @@ -156,6 +314,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, input->name = client->name; input->id.bustype = BUS_I2C; + input->open = pixcir_input_open; + input->close = pixcir_input_close; input->dev.parent = &client->dev; __set_bit(EV_KEY, input->evbit); @@ -176,11 +336,22 @@ 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; - i2c_set_clientdata(client, tsdata); device_init_wakeup(&client->dev, 1); return 0; @@ -188,13 +359,8 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client, static int pixcir_i2c_ts_remove(struct i2c_client *client) { - struct pixcir_i2c_ts_data *tsdata = i2c_get_clientdata(client); - device_init_wakeup(&client->dev, 0); - tsdata->exiting = true; - mb(); - 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;