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Sat, 4 Nov 2023 14:47:20 +0800 (CST) Received: from huaweicloud.com (unknown [10.175.101.107]) by APP4 (Coremail) with SMTP id gCh0CgDnfd3z6EVlglQtEw--.50758S7; Sat, 04 Nov 2023 14:47:20 +0800 (CST) From: Zhang Xiaoxu To: zhangxiaoxu5@huawei.com, weiyongjun1@huawei.com, broonie@kernel.org, rostedt@goodmis.org, mingo@redhat.com, frowand.list@gmail.com, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 -next 3/5] spi: mockup: Add support register the device through configfs Date: Sat, 4 Nov 2023 14:46:48 +0800 Message-Id: <20231104064650.972687-4-zhangxiaoxu@huaweicloud.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231104064650.972687-1-zhangxiaoxu@huaweicloud.com> References: <20231104064650.972687-1-zhangxiaoxu@huaweicloud.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: gCh0CgDnfd3z6EVlglQtEw--.50758S7 X-Coremail-Antispam: 1UD129KBjvJXoW3AF47Jw4rGF13Jw1xurW3KFg_yoW7Zw4DpF Z8AFy5trW8GFs8WF4fC34kuF95Gr1xKr4Uta43Aw1FkwnrAry8Zas7WFyYyr48JFWDGF47 ZFWfZF10krWjvrUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvGb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2 6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUWw A2048vs2IY020Ec7CjxVAFwI0_Xr0E3s1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxS w2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxV W8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E14v2 6rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7xfMc Ij6xIIjxv20xvE14v26r1Y6r17McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Yz7v_ Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr 0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY 17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIxAIcV C0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY 6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa 73UjIFyTuYvjxUrfOzDUUUU X-CM-SenderInfo: x2kd0wp0ld053x6k3tpzhluzxrxghudrp/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Zhang Xiaoxu This enable/disable the spi mockup device through the configfs: mkdir /sys/kernel/config/spi-mockup/spi0 echo 1 > /sys/kernel/config/spi-mockup/spi0/enable echo 1 > /sys/kernel/config/spi-mockup/spi0/disable Signed-off-by: Zhang Xiaoxu --- drivers/spi/spi-mockup.c | 163 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 161 insertions(+), 2 deletions(-) diff --git a/drivers/spi/spi-mockup.c b/drivers/spi/spi-mockup.c index fcaaa61bdb38..b449a2b7cdd4 100644 --- a/drivers/spi/spi-mockup.c +++ b/drivers/spi/spi-mockup.c @@ -12,6 +12,7 @@ #include #include #include +#include =20 #define CREATE_TRACE_POINTS #include @@ -224,7 +225,7 @@ static int spi_mockup_probe(struct platform_device *pde= v) ctrl->dev.groups =3D spi_mockup_groups; ctrl->num_chipselect =3D MOCKUP_CHIPSELECT_MAX; ctrl->mode_bits =3D SPI_MODE_USER_MASK; - ctrl->bus_num =3D 0; + ctrl->bus_num =3D pdev->id; ctrl->transfer_one_message =3D spi_mockup_transfer; =20 mock =3D spi_controller_get_devdata(ctrl); @@ -252,7 +253,165 @@ static struct platform_driver spi_mockup_driver =3D { .of_match_table =3D spi_mockup_match, }, }; -module_platform_driver(spi_mockup_driver); + +struct spi_mockup_device { + struct config_group group; + unsigned int bus_nr; + struct mutex lock; + struct platform_device *pdev; +}; + +static struct spi_mockup_device *to_spi_mockup_dev(struct config_item *ite= m) +{ + struct config_group *group =3D to_config_group(item); + + return container_of(group, struct spi_mockup_device, group); +} + +static ssize_t +spi_mockup_enable_store(struct config_item *item, const char *page, size_t= len) +{ + int ret =3D len; + struct platform_device_info pdevinfo =3D {0}; + struct spi_mockup_device *dev =3D to_spi_mockup_dev(item); + + mutex_lock(&dev->lock); + if (dev->pdev) { + ret =3D -EEXIST; + goto out; + } + + pdevinfo.name =3D "spi-mockup"; + pdevinfo.id =3D dev->bus_nr; + dev->pdev =3D platform_device_register_full(&pdevinfo); + if (IS_ERR(dev->pdev)) { + ret =3D PTR_ERR(dev->pdev); + dev->pdev =3D NULL; + goto out; + } +out: + mutex_unlock(&dev->lock); + return ret; +} +CONFIGFS_ATTR_WO(spi_mockup_, enable); + +static ssize_t +spi_mockup_disable_store(struct config_item *item, const char *page, size_= t len) +{ + int ret =3D len; + struct spi_mockup_device *dev =3D to_spi_mockup_dev(item); + + mutex_lock(&dev->lock); + if (!dev->pdev) { + ret =3D -ENODEV; + goto out; + } + + platform_device_unregister(dev->pdev); + dev->pdev =3D NULL; +out: + mutex_unlock(&dev->lock); + return ret; +} +CONFIGFS_ATTR_WO(spi_mockup_, disable); + +static struct configfs_attribute *spi_mockup_configfs_attrs[] =3D { + &spi_mockup_attr_enable, + &spi_mockup_attr_disable, + NULL, +}; + +static const struct config_item_type spi_mockup_device_config_group_type = =3D { + .ct_owner =3D THIS_MODULE, + .ct_attrs =3D spi_mockup_configfs_attrs, +}; + +static struct config_group * +spi_mockup_config_make_device_group(struct config_group *group, + const char *name) +{ + int ret, nchar; + unsigned int nr; + struct spi_mockup_device *dev; + + ret =3D sscanf(name, "spi%u%n", &nr, &nchar); + if (ret !=3D 1 || nchar !=3D strlen(name)) + return ERR_PTR(-EINVAL); + + dev =3D kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) + return ERR_PTR(-ENOMEM); + + dev->bus_nr =3D nr; + mutex_init(&dev->lock); + + config_group_init_type_name(&dev->group, name, + &spi_mockup_device_config_group_type); + + return &dev->group; +} + +static void spi_mockup_config_group_release(struct config_item *item) +{ + struct spi_mockup_device *dev =3D to_spi_mockup_dev(item); + + kfree(dev); +} + +static struct configfs_item_operations spi_mockup_config_item_ops =3D { + .release =3D spi_mockup_config_group_release, +}; + +static struct configfs_group_operations spi_mockup_config_group_ops =3D { + .make_group =3D spi_mockup_config_make_device_group, +}; + +static const struct config_item_type spi_mockup_config_type =3D { + .ct_owner =3D THIS_MODULE, + .ct_group_ops =3D &spi_mockup_config_group_ops, + .ct_item_ops =3D &spi_mockup_config_item_ops, +}; + +static struct configfs_subsystem spi_mockup_config_subsys =3D { + .su_group =3D { + .cg_item =3D { + .ci_namebuf =3D "spi-mockup", + .ci_type =3D &spi_mockup_config_type, + } + } +}; + +static int __init spi_mockup_init(void) +{ + int ret; + + ret =3D platform_driver_register(&spi_mockup_driver); + if (ret) { + pr_err("spi mockup driver registering failed with %d\n", ret); + return ret; + } + + config_group_init(&spi_mockup_config_subsys.su_group); + mutex_init(&spi_mockup_config_subsys.su_mutex); + ret =3D configfs_register_subsystem(&spi_mockup_config_subsys); + if (ret) { + pr_err("spi mockup configfs registering failed with %d\n", ret); + mutex_destroy(&spi_mockup_config_subsys.su_mutex); + platform_driver_unregister(&spi_mockup_driver); + return ret; + } + + return ret; +} +module_init(spi_mockup_init); + +static void __exit spi_mockup_exit(void) +{ + configfs_unregister_subsystem(&spi_mockup_config_subsys); + mutex_destroy(&spi_mockup_config_subsys.su_mutex); + return platform_driver_unregister(&spi_mockup_driver); +} +module_exit(spi_mockup_exit); =20 MODULE_AUTHOR("Wei Yongjun "); MODULE_DESCRIPTION("SPI controller Testing Driver"); --=20 2.34.1