w1: add ds28ec20 eeprom support
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -15,10 +15,10 @@ config W1_SLAVE_DS2431_WRITE
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depends on W1_SLAVE_DS2431
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config W1_SLAVE_DS2433
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bool "4kb EEPROM family support (DS2433)"
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bool "EEPROM family support (DS2433 4Kb or DS28EC20 20kb)"
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help
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Say Y here if you want to use a 1-wire
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4kb EEPROM family device (DS2433).
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EEPROM family device (DS2433 4Kb or DS28EC20 20kb).
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config W1_SLAVE_DS2433_WRITE
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bool "write support"
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@ -10,8 +10,6 @@
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#include <init.h>
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#include "../w1.h"
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#define W1_EEPROM_SIZE 512
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#define W1_PAGE_COUNT 16
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#define W1_PAGE_SIZE 32
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#define W1_PAGE_BITS 5
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#define W1_PAGE_MASK 0x1F
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@ -23,9 +21,8 @@
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#define W1_F23_READ_SCRATCH 0xAA
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#define W1_F23_COPY_SCRATCH 0x55
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#define DRIVERNAME "ds2433"
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static int ds2433_count = 0;
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static int ds28ec20_count = 0;
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/**
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* Check the file size bounds and adjusts count as needed.
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@ -49,7 +46,7 @@ static ssize_t ds2433_cdev_read(struct cdev *cdev, void *buf, size_t count,
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struct w1_bus *bus = dev->bus;
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u8 wrbuf[3];
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if ((count = ds2433_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
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if ((count = ds2433_fix_count(off, count, cdev->size)) == 0)
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return 0;
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/* read directly from the EEPROM */
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@ -134,7 +131,7 @@ static ssize_t ds2433_cdev_write(struct cdev *cdev, const void *buf, size_t coun
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int addr, len, idx;
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const u8 *buf8 = buf;
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if ((count = ds2433_fix_count(off, count, W1_EEPROM_SIZE)) == 0)
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if ((count = ds2433_fix_count(off, count, cdev->size)) == 0)
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return 0;
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/* Can only write data to one page at a time */
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@ -165,7 +162,7 @@ static struct file_operations ds2433_ops = {
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.lseek = dev_lseek_default,
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};
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static int ds2433_probe(struct w1_device *dev)
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static int ds2433_cdev_create(struct w1_device *dev, int size, int id)
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{
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struct cdev *cdev;
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@ -173,24 +170,48 @@ static int ds2433_probe(struct w1_device *dev)
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cdev->dev = &dev->dev;
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cdev->priv = dev;
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cdev->ops = &ds2433_ops;
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cdev->size = W1_EEPROM_SIZE;
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cdev->name = asprintf(DRIVERNAME"%d", ds2433_count++);
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cdev->size = size;
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cdev->name = asprintf("%s%d", dev->dev.driver->name, id);
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if (cdev->name == NULL)
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return -ENOMEM;
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return devfs_create(cdev);
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}
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static int ds2433_probe(struct w1_device *dev)
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{
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return ds2433_cdev_create(dev, 512, ds2433_count++);
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}
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static int ds28ec20_probe(struct w1_device *dev)
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{
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return ds2433_cdev_create(dev, 2560, ds28ec20_count++);
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}
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struct w1_driver ds2433_driver = {
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.drv = {
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.name = DRIVERNAME,
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.name = "ds2433",
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},
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.probe = ds2433_probe,
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.fid = 0x23,
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};
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struct w1_driver ds28ec20_driver = {
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.drv = {
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.name = "ds28ec20",
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},
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.probe = ds28ec20_probe,
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.fid = 0x43,
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};
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static int w1_ds2433_init(void)
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{
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return w1_driver_register(&ds2433_driver);
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int ret;
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ret = w1_driver_register(&ds2433_driver);
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if (ret)
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return ret;
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return w1_driver_register(&ds28ec20_driver);
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}
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device_initcall(w1_ds2433_init);
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