From patchwork Mon Apr 27 23:55:47 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Baryshkov X-Patchwork-Id: 465318 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 576F11400B7 for ; Tue, 28 Apr 2015 09:57:31 +1000 (AEST) Authentication-Results: ozlabs.org; dkim=fail reason="verification failed; unprotected key" header.d=gmail.com header.i=@gmail.com header.b=dR0lLfOA; dkim-adsp=none (unprotected policy); dkim-atps=neutral Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933082AbbD0X53 (ORCPT ); Mon, 27 Apr 2015 19:57:29 -0400 Received: from mail-pd0-f179.google.com ([209.85.192.179]:36504 "EHLO mail-pd0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932281AbbD0X51 (ORCPT ); Mon, 27 Apr 2015 19:57:27 -0400 Received: by pdea3 with SMTP id a3so144853978pde.3; Mon, 27 Apr 2015 16:57:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=gGTArKu8O3O5K82BqHcb2oLCawXMwE4WmElOxytOSuo=; b=dR0lLfOAO/uCnXyLyj1/EWFsH2wTN3di22z1EYS+0EgtenEegWz9Ic1DAHz2r+9bC2 YIu1Ygr/U2EMMpal/OjTeSnxFUTqVbwbvaHtzXiXVmZnev0RGdCbLNRcdZ19WkzVB65I H1rYom9h4Avn+LvCkaNopgpIulJLLMUzpGo/kB/9tdfTfYKml0AmoLVgGiPLj68Z34Nh 8LaE04xNKQaBX/3eKh4u5/WWJA5Ffx2oAgZIRtTlrI572nF9ntdplYBJDduc2BawGmQU jKKfz/j/YYo8nbstE8IWQ1ggWcxM/LE0RTMW/nuso8Qn4eDbCZqySmkkxMrAcxv1n0oa xunQ== X-Received: by 10.68.191.101 with SMTP id gx5mr26898289pbc.148.1430179047213; Mon, 27 Apr 2015 16:57:27 -0700 (PDT) Received: from fangorn.rup.mentorg.com (nat-min.mentorg.com. [139.181.32.34]) by mx.google.com with ESMTPSA id pv2sm20428375pbb.12.2015.04.27.16.57.21 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 27 Apr 2015 16:57:26 -0700 (PDT) From: Dmitry Eremin-Solenikov To: Russell King , Daniel Mack , Robert Jarzmik , Linus Walleij , Alexandre Courbot , Wolfram Sang , Dmitry Torokhov , Bryan Wu , Richard Purdie , Samuel Ortiz , Lee Jones , Mark Brown , Jingoo Han , Jean-Christophe Plagniol-Villard , Tomi Valkeinen , Liam Girdwood , Andrea Adami Cc: linux-arm-kernel@lists.infradead.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org, linux-spi@vger.kernel.org, linux-fbdev@vger.kernel.org, alsa-devel@alsa-project.org Subject: [PATCH v2 10/17] i2c: add locomo i2c driver Date: Tue, 28 Apr 2015 02:55:47 +0300 Message-Id: <1430178954-11138-11-git-send-email-dbaryshkov@gmail.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1430178954-11138-1-git-send-email-dbaryshkov@gmail.com> References: <1430178954-11138-1-git-send-email-dbaryshkov@gmail.com> Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org LoCoMo chip contains a tiny i2c controller destined to control M62332 DAC. Provide a separate I2C driver for this cell. Signed-off-by: Dmitry Eremin-Solenikov Reviewed-by: Wolfram Sang --- drivers/i2c/busses/Kconfig | 12 ++++ drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-locomo.c | 136 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 149 insertions(+) create mode 100644 drivers/i2c/busses/i2c-locomo.c diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig index 2255af2..114d9da 100644 --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig @@ -602,6 +602,18 @@ config I2C_KEMPLD This driver can also be built as a module. If so, the module will be called i2c-kempld. +config I2C_LOCOMO + tristate "I2C bus support for LoCoMo chips" + depends on MFD_LOCOMO + select I2C_ALGOBIT + help + Say yes if you will run the kernel on Sharp SL-5x00 family of devices. + + If you don't know what to do here, say N. + + This driver can also be built as a module. If so, the module + will be called i2c-locomo. + config I2C_MESON tristate "Amlogic Meson I2C controller" depends on ARCH_MESON diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile index cdf941d..e09dcf6 100644 --- a/drivers/i2c/busses/Makefile +++ b/drivers/i2c/busses/Makefile @@ -58,6 +58,7 @@ obj-$(CONFIG_I2C_IMX) += i2c-imx.o obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o obj-$(CONFIG_I2C_JZ4780) += i2c-jz4780.o obj-$(CONFIG_I2C_KEMPLD) += i2c-kempld.o +obj-$(CONFIG_I2C_LOCOMO) += i2c-locomo.o obj-$(CONFIG_I2C_MESON) += i2c-meson.o obj-$(CONFIG_I2C_MPC) += i2c-mpc.o obj-$(CONFIG_I2C_MV64XXX) += i2c-mv64xxx.o diff --git a/drivers/i2c/busses/i2c-locomo.c b/drivers/i2c/busses/i2c-locomo.c new file mode 100644 index 0000000..640b46cd --- /dev/null +++ b/drivers/i2c/busses/i2c-locomo.c @@ -0,0 +1,136 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include + +#include +#include + +struct locomo_i2c { + struct regmap *regmap; + struct i2c_adapter adap; + struct i2c_algo_bit_data bit; +}; + +static void locomo_i2c_setsda(void *data, int state) +{ + struct locomo_i2c *li2c = data; + + regmap_update_bits(li2c->regmap, LOCOMO_DAC, + LOCOMO_DAC_SDAOEB, + state ? LOCOMO_DAC_SDAOEB : 0); +} + +static void locomo_i2c_setscl(void *data, int state) +{ + struct locomo_i2c *li2c = data; + + regmap_update_bits(li2c->regmap, LOCOMO_DAC, + LOCOMO_DAC_SCLOEB, + state ? LOCOMO_DAC_SCLOEB : 0); +} + +static int locomo_i2c_getsda(void *data) +{ + struct locomo_i2c *li2c = data; + unsigned int r; + + regmap_read(li2c->regmap, LOCOMO_DAC, &r); + + return !!(r & LOCOMO_DAC_SDA); +} + +static int locomo_i2c_probe(struct platform_device *dev) +{ + struct locomo_i2c *li2c; + int ret; + + li2c = devm_kzalloc(&dev->dev, sizeof(struct locomo_i2c), GFP_KERNEL); + if (li2c == NULL) + return -ENOMEM; + + li2c->regmap = dev_get_regmap(dev->dev.parent, NULL); + if (!li2c->regmap) + return -ENODEV; + + li2c->adap.owner = THIS_MODULE; + li2c->adap.dev.parent = &dev->dev; + li2c->adap.dev.of_node = dev->dev.of_node; + li2c->adap.algo_data = &li2c->bit; + li2c->adap.nr = 1; /* On poodle, 0 is pxa internal bus */ + + strlcpy(li2c->adap.name, "LoCoMo I2C", sizeof(li2c->adap.name)); + + li2c->bit.data = li2c; + li2c->bit.setsda = locomo_i2c_setsda; + li2c->bit.setscl = locomo_i2c_setscl; + li2c->bit.getsda = locomo_i2c_getsda; + li2c->bit.udelay = 6; + li2c->bit.timeout = HZ; + + ret = i2c_bit_add_numbered_bus(&li2c->adap); + if (ret) + return ret; + + platform_set_drvdata(dev, li2c); + + return 0; +} + +static int locomo_i2c_remove(struct platform_device *dev) +{ + struct locomo_i2c *li2c = platform_get_drvdata(dev); + + i2c_del_adapter(&li2c->adap); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int locomo_i2c_suspend(struct device *dev) +{ + struct locomo_i2c *li2c = dev_get_drvdata(dev); + + regmap_write(li2c->regmap, LOCOMO_DAC, 0x00); + + return 0; +} + +static int locomo_i2c_resume(struct device *dev) +{ + struct locomo_i2c *li2c = dev_get_drvdata(dev); + + regmap_write(li2c->regmap, LOCOMO_DAC, + LOCOMO_DAC_SDAOEB | LOCOMO_DAC_SCLOEB); + + return 0; +} +static SIMPLE_DEV_PM_OPS(locomo_i2c_pm, locomo_i2c_suspend, locomo_i2c_resume); +#define LOCOMO_I2C_PM (&locomo_i2c_pm) +#else +#define LOCOMO_I2C_PM NULL +#endif + + +static struct platform_driver locomo_i2c_driver = { + .driver = { + .name = "locomo-i2c", + .pm = LOCOMO_I2C_PM, + }, + .probe = locomo_i2c_probe, + .remove = locomo_i2c_remove, +}; + +module_platform_driver(locomo_i2c_driver); + +MODULE_DESCRIPTION("LoCoMo i2c bus driver"); +MODULE_AUTHOR("Dmitry Eremin-Solenikov "); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:locomo-i2c");