linux-kernel - [PATCH v2 7/7] mtd: spi-nor: sysfs: print JEDEC ID for generic flash driver

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Message-Id: <20220810220654.1297699-8-michael@walle.cc>
Date:   Thu, 11 Aug 2022 00:06:54 +0200
From:   Michael Walle <michael@...le.cc>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Pratyush Yadav <pratyush@...nel.org>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        Michael Walle <michael@...le.cc>,
        Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>
Subject: [PATCH v2 7/7] mtd: spi-nor: sysfs: print JEDEC ID for generic flash driver

We don't have a database entry for the generic SPI-NOR flash driver and
thus we don't have a JEDEC ID to print. Print the (cached) JEDEC ID
instead.

Signed-off-by: Michael Walle <michael@...le.cc>
Reviewed-by: Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>
---
 drivers/mtd/spi-nor/sysfs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/spi-nor/sysfs.c b/drivers/mtd/spi-nor/sysfs.c
index 20563c1926f4..c09bb832b3b9 100644
--- a/drivers/mtd/spi-nor/sysfs.c
+++ b/drivers/mtd/spi-nor/sysfs.c
@@ -35,8 +35,10 @@ static ssize_t jedec_id_show(struct device *dev,
 	struct spi_device *spi = to_spi_device(dev);
 	struct spi_mem *spimem = spi_get_drvdata(spi);
 	struct spi_nor *nor = spi_mem_get_drvdata(spimem);
+	const u8 *id = nor->info->id_len ? nor->info->id : nor->id;
+	u8 id_len = nor->info->id_len ?: SPI_NOR_MAX_ID_LEN;
 
-	return sysfs_emit(buf, "%*phN\n", nor->info->id_len, nor->info->id);
+	return sysfs_emit(buf, "%*phN\n", id_len, id);
 }
 static DEVICE_ATTR_RO(jedec_id);
 
@@ -76,7 +78,7 @@ static umode_t spi_nor_sysfs_is_visible(struct kobject *kobj,
 
 	if (attr == &dev_attr_manufacturer.attr && !nor->manufacturer)
 		return 0;
-	if (attr == &dev_attr_jedec_id.attr && !nor->info->id_len)
+	if (attr == &dev_attr_jedec_id.attr && !nor->info->id_len && !nor->id)
 		return 0;
 
 	return 0444;
-- 
2.30.2