On Sun, Jan 22, 2017 at 12:12 PM, Nick Dyer <nick@xxxxxxxxxxxxx> wrote: > > On Fri, Jan 20, 2017 at 02:42:52PM +0100, Benjamin Tissoires wrote: > > Subject: Re: [PATCH 2/2] Input: synaptics-rmi4 - add sysfs interfaces for > > hardware IDs > > > > Hi Nick, > > > > Well, first, you need a changelog explaining why you need custom sysfs > > files. > > It is for a firmware update system that works across a number of devices > supported by the synaptics-rmi4 driver. It needs to manage multiple > different versions of the firmware/hardware and which ones are > compatible with which. I will put it in the commit message: although > possibly the information would be useful even if you weren't trying to > update firmware. In my use case, I have 6 different IFE (in flight entertainment) system displays, all with the same kernel/rootfs running on them and all with different size LCD and touchscreen. Across this 6 displays, there are two different models of Synaptics touch controllers which results in 2 different FW images and 6 different FW configs. This results in there being 6 different loadable FW binaries. Each FW binary includes the FW itself and an embedded configuration block. When we perform a system SW upgrade, there is a touchscreen FW update step which executes a shell script that uses these sysfs entries to figure out which FW binary to load from /lib/firmware AND if the latest FW/config is already loaded to the controller. This way we don't execute a FW update if the FW/config is already the correct version. Having sysfs entries makes this process quite simple with a shell script. > > > Then, I really wonder if this is the best solution. You are trying to > > solve a general problem in a specific way, while other drivers/devices > > could benefit from reporting such information in a generic way. > > > > I don't have a solution, but I know that we already had the case where > > userspace wants to know which firmware is currently loaded on a > > board[1]. > > > > A solution could be to add some ioctls to evdev to report those various > > hardware IDs, but I am not so sure it will help in the RMI4 device while > > in bootloader case. > > If we are trying to recover a broken device (eg corrupt firmware), we > might not have the information to register an input device anyway. > > I agree that a generic solution to get this information would be nice. > But we would have to map the complexities of the underlying > hardware/firmware anyway - for example, an "input device" may have > multiple components with separate firmwares having individual versions. > > So it would end up being a hierarchy with attributes of various types: > isn't that just sysfs? > > > If Dmitry agrees to take this one, I have nothing against it. > > > > Cheers, > > Benjamin > > > > [1] https://bugs.freedesktop.org/show_bug.cgi?id=97912 > > > > On Dec 30 2016 or thereabouts, Nick Dyer wrote: > > > Signed-off-by: Nick Dyer <nick@xxxxxxxxxxxxx> > > > --- > > > drivers/input/rmi4/rmi_driver.c | 2 +- > > > drivers/input/rmi4/rmi_driver.h | 6 +- > > > drivers/input/rmi4/rmi_f01.c | 45 ++++++++++++++- > > > drivers/input/rmi4/rmi_f34.c | 123 ++++++++++++++++++++++++++++++++++++++++ > > > 4 files changed, 172 insertions(+), 4 deletions(-) > > > > > > diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c > > > index cb6efe6..e0359d6 100644 > > > --- a/drivers/input/rmi4/rmi_driver.c > > > +++ b/drivers/input/rmi4/rmi_driver.c > > > @@ -365,7 +365,7 @@ static void rmi_driver_set_input_name(struct rmi_device *rmi_dev, > > > struct input_dev *input) > > > { > > > struct rmi_driver_data *data = dev_get_drvdata(&rmi_dev->dev); > > > - char *device_name = rmi_f01_get_product_ID(data->f01_container); > > > + const char *device_name = rmi_f01_get_product_ID(data->f01_container); > > > char *name; > > > > > > name = devm_kasprintf(&rmi_dev->dev, GFP_KERNEL, > > > diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_driver.h > > > index 24f8f76..48b3131 100644 > > > --- a/drivers/input/rmi4/rmi_driver.h > > > +++ b/drivers/input/rmi4/rmi_driver.h > > > @@ -104,7 +104,11 @@ int rmi_init_functions(struct rmi_driver_data *data); > > > int rmi_initial_reset(struct rmi_device *rmi_dev, void *ctx, > > > const struct pdt_entry *pdt); > > > > > > -char *rmi_f01_get_product_ID(struct rmi_function *fn); > > > +const char *rmi_f01_get_product_ID(struct rmi_function *fn); > > > +u8 rmi_f01_get_manufacturer_ID(struct rmi_function *fn); > > > +const char *rmi_f01_get_date_of_manufacture(struct rmi_function *fn); > > > +u32 rmi_f01_get_firmware_ID(struct rmi_function *fn); > > > +u32 rmi_f01_get_package_ID(struct rmi_function *fn); > > > > > > #ifdef CONFIG_RMI4_F34 > > > int rmi_f34_create_sysfs(struct rmi_device *rmi_dev); > > > diff --git a/drivers/input/rmi4/rmi_f01.c b/drivers/input/rmi4/rmi_f01.c > > > index cae35c6..1b03f4d 100644 > > > --- a/drivers/input/rmi4/rmi_f01.c > > > +++ b/drivers/input/rmi4/rmi_f01.c > > > @@ -13,6 +13,7 @@ > > > #include <linux/slab.h> > > > #include <linux/uaccess.h> > > > #include <linux/of.h> > > > +#include <asm/unaligned.h> > > > #include "rmi_driver.h" > > > > > > #define RMI_PRODUCT_ID_LENGTH 10 > > > @@ -55,6 +56,7 @@ struct f01_basic_properties { > > > u8 product_id[RMI_PRODUCT_ID_LENGTH + 1]; > > > u16 productinfo; > > > u32 firmware_id; > > > + u32 package_id; > > > }; > > > > > > /* F01 device status bits */ > > > @@ -221,8 +223,19 @@ static int rmi_f01_read_properties(struct rmi_device *rmi_dev, > > > has_build_id_query = !!(queries[0] & BIT(1)); > > > } > > > > > > - if (has_package_id_query) > > > + if (has_package_id_query) { > > > + ret = rmi_read_block(rmi_dev, prod_info_addr, > > > + queries, sizeof(__le64)); > > > + if (ret) { > > > + dev_err(&rmi_dev->dev, > > > + "Failed to read package info: %d\n", > > > + ret); > > > + return ret; > > > + } > > > + > > > + props->package_id = get_unaligned_le64(queries); > > > prod_info_addr++; > > > + } > > > > > > if (has_build_id_query) { > > > ret = rmi_read_block(rmi_dev, prod_info_addr, queries, > > > @@ -242,13 +255,41 @@ static int rmi_f01_read_properties(struct rmi_device *rmi_dev, > > > return 0; > > > } > > > > > > -char *rmi_f01_get_product_ID(struct rmi_function *fn) > > > +const char *rmi_f01_get_product_ID(struct rmi_function *fn) > > > { > > > struct f01_data *f01 = dev_get_drvdata(&fn->dev); > > > > > > return f01->properties.product_id; > > > } > > > > > > +u8 rmi_f01_get_manufacturer_ID(struct rmi_function *fn) > > > +{ > > > + struct f01_data *f01 = dev_get_drvdata(&fn->dev); > > > + > > > + return f01->properties.manufacturer_id; > > > +} > > > + > > > +const char *rmi_f01_get_date_of_manufacture(struct rmi_function *fn) > > > +{ > > > + struct f01_data *f01 = dev_get_drvdata(&fn->dev); > > > + > > > + return f01->properties.dom; > > > +} > > > + > > > +u32 rmi_f01_get_firmware_ID(struct rmi_function *fn) > > > +{ > > > + struct f01_data *f01 = dev_get_drvdata(&fn->dev); > > > + > > > + return f01->properties.firmware_id; > > > +} > > > + > > > +u32 rmi_f01_get_package_ID(struct rmi_function *fn) > > > +{ > > > + struct f01_data *f01 = dev_get_drvdata(&fn->dev); > > > + > > > + return f01->properties.package_id; > > > +} > > > + > > > #ifdef CONFIG_OF > > > static int rmi_f01_of_probe(struct device *dev, > > > struct rmi_device_platform_data *pdata) > > > diff --git a/drivers/input/rmi4/rmi_f34.c b/drivers/input/rmi4/rmi_f34.c > > > index d7709bc..b7b38c1 100644 > > > --- a/drivers/input/rmi4/rmi_f34.c > > > +++ b/drivers/input/rmi4/rmi_f34.c > > > @@ -394,6 +394,122 @@ static int rmi_firmware_update(struct rmi_driver_data *data, > > > return ret; > > > } > > > > > > +static ssize_t rmi_driver_manufacturer_id_show(struct device *dev, > > > + struct device_attribute *dattr, > > > + char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f01_container; > > > + > > > + return scnprintf(buf, PAGE_SIZE, "%d\n", > > > + rmi_f01_get_manufacturer_ID(fn)); > > > +} > > > + > > > +static DEVICE_ATTR(manufacturer_id, 0444, > > > + rmi_driver_manufacturer_id_show, NULL); > > > + > > > +static ssize_t rmi_driver_dom_show(struct device *dev, > > > + struct device_attribute *dattr, char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f01_container; > > > + > > > + return scnprintf(buf, PAGE_SIZE, "%s\n", > > > + rmi_f01_get_date_of_manufacture(fn)); > > > +} > > > + > > > +static DEVICE_ATTR(date_of_manufacture, 0444, rmi_driver_dom_show, NULL); > > > + > > > +static ssize_t rmi_driver_product_id_show(struct device *dev, > > > + struct device_attribute *dattr, > > > + char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f01_container; > > > + > > > + return scnprintf(buf, PAGE_SIZE, "%s\n", > > > + rmi_f01_get_product_ID(fn)); > > > +} > > > + > > > +static DEVICE_ATTR(product_id, 0444, > > > + rmi_driver_product_id_show, NULL); > > > + > > > +static ssize_t rmi_driver_firmware_id_show(struct device *dev, > > > + struct device_attribute *dattr, > > > + char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f01_container; > > > + > > > + return scnprintf(buf, PAGE_SIZE, "%d\n", > > > + rmi_f01_get_firmware_ID(fn)); > > > +} > > > + > > > +static DEVICE_ATTR(firmware_id, 0444, > > > + rmi_driver_firmware_id_show, NULL); > > > + > > > +static ssize_t rmi_driver_bootloader_id_show(struct device *dev, > > > + struct device_attribute *dattr, > > > + char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f34_container; > > > + struct f34_data *f34; > > > + > > > + if (fn) { > > > + f34 = dev_get_drvdata(&fn->dev); > > > + > > > + if (f34->bl_version == 5) > > > + return scnprintf(buf, PAGE_SIZE, "%c%c\n", > > > + f34->bootloader_id[0], > > > + f34->bootloader_id[1]); > > > + else > > > + return scnprintf(buf, PAGE_SIZE, "V%d.%d\n", > > > + f34->bootloader_id[1], > > > + f34->bootloader_id[0]); > > > + } > > > + > > > + return 0; > > > +} > > > + > > > +static DEVICE_ATTR(bootloader_id, 0444, > > > + rmi_driver_bootloader_id_show, NULL); > > > + > > > +static ssize_t rmi_driver_configuration_id_show(struct device *dev, > > > + struct device_attribute *dattr, > > > + char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f34_container; > > > + struct f34_data *f34; > > > + > > > + if (fn) { > > > + f34 = dev_get_drvdata(&fn->dev); > > > + > > > + return scnprintf(buf, PAGE_SIZE, "%s\n", f34->configuration_id); > > > + } > > > + > > > + return 0; > > > +} > > > + > > > +static DEVICE_ATTR(configuration_id, 0444, > > > + rmi_driver_configuration_id_show, NULL); > > > + > > > +static ssize_t rmi_driver_package_id_show(struct device *dev, > > > + struct device_attribute *dattr, > > > + char *buf) > > > +{ > > > + struct rmi_driver_data *data = dev_get_drvdata(dev); > > > + struct rmi_function *fn = data->f01_container; > > > + > > > + u32 package_id = rmi_f01_get_package_ID(fn); > > > + > > > + return scnprintf(buf, PAGE_SIZE, "%04x.%04x\n", > > > + package_id & 0xffff, (package_id >> 16) & 0xffff); > > > +} > > > + > > > +static DEVICE_ATTR(package_id, 0444, rmi_driver_package_id_show, NULL); > > > + > > > static int rmi_firmware_update(struct rmi_driver_data *data, > > > const struct firmware *fw); > > > > > > @@ -448,6 +564,13 @@ static DEVICE_ATTR(update_fw_status, 0444, > > > rmi_driver_update_fw_status_show, NULL); > > > > > > static struct attribute *rmi_firmware_attrs[] = { > > > + &dev_attr_bootloader_id.attr, > > > + &dev_attr_configuration_id.attr, > > > + &dev_attr_manufacturer_id.attr, > > > + &dev_attr_date_of_manufacture.attr, > > > + &dev_attr_product_id.attr, > > > + &dev_attr_package_id.attr, > > > + &dev_attr_firmware_id.attr, > > > &dev_attr_update_fw.attr, > > > &dev_attr_update_fw_status.attr, > > > NULL > > > -- > > > 2.7.4 > > > -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
