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[209.132.180.67]) by mx.google.com with ESMTP id 127si44856867pfa.4.2016.02.01.00.19.29; Mon, 01 Feb 2016 00:19:29 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dkim=pass header.i=@linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752242AbcBAIT1 (ORCPT + 30 others); Mon, 1 Feb 2016 03:19:27 -0500 Received: from mail-pa0-f50.google.com ([209.85.220.50]:33827 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751622AbcBAITZ (ORCPT ); Mon, 1 Feb 2016 03:19:25 -0500 Received: by mail-pa0-f50.google.com with SMTP id uo6so79517120pac.1 for ; Mon, 01 Feb 2016 00:19:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=TGwcrbipNBubsEfOeperFF1uXR6hDFhAeZnQFjo5Hds=; b=X+ypmc2P/TDqSNNCnNG1SIk9nxarll6PpuQBk1oNK2BA/A+/s/FJPpKRimE00ZL4Ul 1Tc/BE3jUqGPevsCdGADZtiRnDpMY6UYqD/a0tzFD7EkUkTanS0PoI/06xLvRL80/qZT 8b5ursvODbIfhHb6ctC4vP/XSDTSReIB2u1Uc= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=TGwcrbipNBubsEfOeperFF1uXR6hDFhAeZnQFjo5Hds=; b=V+Tk5rJ1XpcVWFz7v3SGY2GcydKjaia77uO4NpksAuVfilggFslp8rJ3djNcMfm201 K1M7VSgyZjJP6r+jw6szvzv6Q7ALJ1Iey33k7AvNoghc4NGztDNK4Nbt/2pqFvP+t4U8 dwrC0HJ5gpITYHPTgW76AyNP/NPHF2QN/zV3boYRTz/dr7tWCGEaObi1jkqRyMyI1BAl MY+2qdCjw0JdlqJBNPCmfHLA6zTpWJazNsNqE5ZiA8rCPIaBpnelQuB667DgbgBMGQZI 3HzOHIERjaskR1GuGtG5f/vRi5qRcaU0WUFLwAsFa0zT38aseWSy6xqmaUJCHdQO1rBD fzkA== X-Gm-Message-State: AG10YOSIp6ofVkClxJhSFz9pdHaKVmZKWKi/4K0HzCzOPGD0IhxPjecOKjMBwM2V53sgkGyB X-Received: by 10.66.151.198 with SMTP id us6mr1248304pab.79.1454314765319; Mon, 01 Feb 2016 00:19:25 -0800 (PST) Received: from zcy-ubuntu.spreadtrum.com ([175.111.195.49]) by smtp.gmail.com with ESMTPSA id r15sm40987724pfr.59.2016.02.01.00.19.20 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 01 Feb 2016 00:19:24 -0800 (PST) From: Chunyan Zhang To: mathieu.poirier@linaro.org, alexander.shishkin@linux.intel.com Cc: robh@kernel.org, broonie@kernel.org, pratikp@codeaurora.org, nicolas.guion@st.com, corbet@lwn.net, mark.rutland@arm.com, zhang.lyra@gmail.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-api@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH 1/6] stm class: Add ioctl get_options interface Date: Mon, 1 Feb 2016 16:19:09 +0800 Message-Id: <1454314749-9149-1-git-send-email-zhang.chunyan@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1454313529-8860-2-git-send-email-zhang.chunyan@linaro.org> References: <1454313529-8860-2-git-send-email-zhang.chunyan@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is already an interface of set_options, but no get_options yet. Before setting any options, one would may want to see the current status of that option by means of get_options interface. This interface has been used in CoreSight STM driver. Signed-off-by: Chunyan Zhang --- drivers/hwtracing/stm/core.c | 11 +++++++++++ include/linux/stm.h | 3 +++ include/uapi/linux/stm.h | 1 + 3 files changed, 15 insertions(+) -- 1.9.1 diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c index b6445d9..86bb4e3 100644 --- a/drivers/hwtracing/stm/core.c +++ b/drivers/hwtracing/stm/core.c @@ -571,6 +571,17 @@ stm_char_ioctl(struct file *file, unsigned int cmd, unsigned long arg) options); break; + + case STP_GET_OPTIONS: + if (stm_data->get_options) + err = stm_data->get_options(stm_data, + stmf->output.master, + stmf->output.channel, + stmf->output.nr_chans, + &options); + + return copy_to_user((void __user *)arg, &options, sizeof(u64)); + default: break; } diff --git a/include/linux/stm.h b/include/linux/stm.h index 9d0083d..f351d62 100644 --- a/include/linux/stm.h +++ b/include/linux/stm.h @@ -88,6 +88,9 @@ struct stm_data { long (*set_options)(struct stm_data *, unsigned int, unsigned int, unsigned int, unsigned long); + long (*get_options)(struct stm_data *, unsigned int, + unsigned int, unsigned int, + u64 *); }; int stm_register_device(struct device *parent, struct stm_data *stm_data, diff --git a/include/uapi/linux/stm.h b/include/uapi/linux/stm.h index 626a8d3..0dab16e 100644 --- a/include/uapi/linux/stm.h +++ b/include/uapi/linux/stm.h @@ -46,5 +46,6 @@ struct stp_policy_id { #define STP_POLICY_ID_SET _IOWR('%', 0, struct stp_policy_id) #define STP_POLICY_ID_GET _IOR('%', 1, struct stp_policy_id) #define STP_SET_OPTIONS _IOW('%', 2, __u64) +#define STP_GET_OPTIONS _IOR('%', 3, __u64) #endif /* _UAPI_LINUX_STM_H */