diff options
Diffstat (limited to 'drivers/misc/eeprom')
-rw-r--r-- | drivers/misc/eeprom/ee1004.c | 43 | ||||
-rw-r--r-- | drivers/misc/eeprom/idt_89hpesx.c | 6 |
2 files changed, 34 insertions, 15 deletions
diff --git a/drivers/misc/eeprom/ee1004.c b/drivers/misc/eeprom/ee1004.c index be3263df278a..6f00c33cfe22 100644 --- a/drivers/misc/eeprom/ee1004.c +++ b/drivers/misc/eeprom/ee1004.c @@ -2,7 +2,7 @@ /* * ee1004 - driver for DDR4 SPD EEPROMs * - * Copyright (C) 2017 Jean Delvare + * Copyright (C) 2017-2019 Jean Delvare * * Based on the at24 driver: * Copyright (C) 2005-2007 David Brownell @@ -53,6 +53,24 @@ MODULE_DEVICE_TABLE(i2c, ee1004_ids); /*-------------------------------------------------------------------------*/ +static int ee1004_get_current_page(void) +{ + int err; + + err = i2c_smbus_read_byte(ee1004_set_page[0]); + if (err == -ENXIO) { + /* Nack means page 1 is selected */ + return 1; + } + if (err < 0) { + /* Anything else is a real error, bail out */ + return err; + } + + /* Ack means page 0 is selected, returned value meaningless */ + return 0; +} + static ssize_t ee1004_eeprom_read(struct i2c_client *client, char *buf, unsigned int offset, size_t count) { @@ -102,6 +120,16 @@ static ssize_t ee1004_read(struct file *filp, struct kobject *kobj, /* Data is ignored */ status = i2c_smbus_write_byte(ee1004_set_page[page], 0x00); + if (status == -ENXIO) { + /* + * Don't give up just yet. Some memory + * modules will select the page but not + * ack the command. Check which page is + * selected now. + */ + if (ee1004_get_current_page() == page) + status = 0; + } if (status < 0) { dev_err(dev, "Failed to select page %d (%d)\n", page, status); @@ -186,17 +214,10 @@ static int ee1004_probe(struct i2c_client *client, } /* Remember current page to avoid unneeded page select */ - err = i2c_smbus_read_byte(ee1004_set_page[0]); - if (err == -ENXIO) { - /* Nack means page 1 is selected */ - ee1004_current_page = 1; - } else if (err < 0) { - /* Anything else is a real error, bail out */ + err = ee1004_get_current_page(); + if (err < 0) goto err_clients; - } else { - /* Ack means page 0 is selected, returned value meaningless */ - ee1004_current_page = 0; - } + ee1004_current_page = err; dev_dbg(&client->dev, "Currently selected page: %d\n", ee1004_current_page); mutex_unlock(&ee1004_bus_lock); diff --git a/drivers/misc/eeprom/idt_89hpesx.c b/drivers/misc/eeprom/idt_89hpesx.c index 8a4659518c33..81c70e5bc168 100644 --- a/drivers/misc/eeprom/idt_89hpesx.c +++ b/drivers/misc/eeprom/idt_89hpesx.c @@ -115,7 +115,6 @@ static struct dentry *csr_dbgdir; * @client: i2c client used to perform IO operations * * @ee_file: EEPROM read/write sysfs-file - * @csr_file: CSR read/write debugfs-node */ struct idt_smb_seq; struct idt_89hpesx_dev { @@ -137,7 +136,6 @@ struct idt_89hpesx_dev { struct bin_attribute *ee_file; struct dentry *csr_dir; - struct dentry *csr_file; }; /* @@ -1378,8 +1376,8 @@ static void idt_create_dbgfs_files(struct idt_89hpesx_dev *pdev) pdev->csr_dir = debugfs_create_dir(fname, csr_dbgdir); /* Create Debugfs file for CSR read/write operations */ - pdev->csr_file = debugfs_create_file(cli->name, 0600, - pdev->csr_dir, pdev, &csr_dbgfs_ops); + debugfs_create_file(cli->name, 0600, pdev->csr_dir, pdev, + &csr_dbgfs_ops); } /* |