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path: root/ANDROID_3.4.5/drivers/misc/eeprom/eeprom_93xx46.c
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Diffstat (limited to 'ANDROID_3.4.5/drivers/misc/eeprom/eeprom_93xx46.c')
-rw-r--r--ANDROID_3.4.5/drivers/misc/eeprom/eeprom_93xx46.c400
1 files changed, 0 insertions, 400 deletions
diff --git a/ANDROID_3.4.5/drivers/misc/eeprom/eeprom_93xx46.c b/ANDROID_3.4.5/drivers/misc/eeprom/eeprom_93xx46.c
deleted file mode 100644
index ce3fe363..00000000
--- a/ANDROID_3.4.5/drivers/misc/eeprom/eeprom_93xx46.c
+++ /dev/null
@@ -1,400 +0,0 @@
-/*
- * Driver for 93xx46 EEPROMs
- *
- * (C) 2011 DENX Software Engineering, Anatolij Gustschin <agust@denx.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/slab.h>
-#include <linux/spi/spi.h>
-#include <linux/sysfs.h>
-#include <linux/eeprom_93xx46.h>
-
-#define OP_START 0x4
-#define OP_WRITE (OP_START | 0x1)
-#define OP_READ (OP_START | 0x2)
-#define ADDR_EWDS 0x00
-#define ADDR_ERAL 0x20
-#define ADDR_EWEN 0x30
-
-struct eeprom_93xx46_dev {
- struct spi_device *spi;
- struct eeprom_93xx46_platform_data *pdata;
- struct bin_attribute bin;
- struct mutex lock;
- int addrlen;
-};
-
-static ssize_t
-eeprom_93xx46_bin_read(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
-{
- struct eeprom_93xx46_dev *edev;
- struct device *dev;
- struct spi_message m;
- struct spi_transfer t[2];
- int bits, ret;
- u16 cmd_addr;
-
- dev = container_of(kobj, struct device, kobj);
- edev = dev_get_drvdata(dev);
-
- if (unlikely(off >= edev->bin.size))
- return 0;
- if ((off + count) > edev->bin.size)
- count = edev->bin.size - off;
- if (unlikely(!count))
- return count;
-
- cmd_addr = OP_READ << edev->addrlen;
-
- if (edev->addrlen == 7) {
- cmd_addr |= off & 0x7f;
- bits = 10;
- } else {
- cmd_addr |= off & 0x3f;
- bits = 9;
- }
-
- dev_dbg(&edev->spi->dev, "read cmd 0x%x, %d Hz\n",
- cmd_addr, edev->spi->max_speed_hz);
-
- spi_message_init(&m);
- memset(t, 0, sizeof(t));
-
- t[0].tx_buf = (char *)&cmd_addr;
- t[0].len = 2;
- t[0].bits_per_word = bits;
- spi_message_add_tail(&t[0], &m);
-
- t[1].rx_buf = buf;
- t[1].len = count;
- t[1].bits_per_word = 8;
- spi_message_add_tail(&t[1], &m);
-
- mutex_lock(&edev->lock);
-
- if (edev->pdata->prepare)
- edev->pdata->prepare(edev);
-
- ret = spi_sync(edev->spi, &m);
- /* have to wait at least Tcsl ns */
- ndelay(250);
- if (ret) {
- dev_err(&edev->spi->dev, "read %zu bytes at %d: err. %d\n",
- count, (int)off, ret);
- }
-
- if (edev->pdata->finish)
- edev->pdata->finish(edev);
-
- mutex_unlock(&edev->lock);
- return ret ? : count;
-}
-
-static int eeprom_93xx46_ew(struct eeprom_93xx46_dev *edev, int is_on)
-{
- struct spi_message m;
- struct spi_transfer t;
- int bits, ret;
- u16 cmd_addr;
-
- cmd_addr = OP_START << edev->addrlen;
- if (edev->addrlen == 7) {
- cmd_addr |= (is_on ? ADDR_EWEN : ADDR_EWDS) << 1;
- bits = 10;
- } else {
- cmd_addr |= (is_on ? ADDR_EWEN : ADDR_EWDS);
- bits = 9;
- }
-
- dev_dbg(&edev->spi->dev, "ew cmd 0x%04x\n", cmd_addr);
-
- spi_message_init(&m);
- memset(&t, 0, sizeof(t));
-
- t.tx_buf = &cmd_addr;
- t.len = 2;
- t.bits_per_word = bits;
- spi_message_add_tail(&t, &m);
-
- mutex_lock(&edev->lock);
-
- if (edev->pdata->prepare)
- edev->pdata->prepare(edev);
-
- ret = spi_sync(edev->spi, &m);
- /* have to wait at least Tcsl ns */
- ndelay(250);
- if (ret)
- dev_err(&edev->spi->dev, "erase/write %sable error %d\n",
- is_on ? "en" : "dis", ret);
-
- if (edev->pdata->finish)
- edev->pdata->finish(edev);
-
- mutex_unlock(&edev->lock);
- return ret;
-}
-
-static ssize_t
-eeprom_93xx46_write_word(struct eeprom_93xx46_dev *edev,
- const char *buf, unsigned off)
-{
- struct spi_message m;
- struct spi_transfer t[2];
- int bits, data_len, ret;
- u16 cmd_addr;
-
- cmd_addr = OP_WRITE << edev->addrlen;
-
- if (edev->addrlen == 7) {
- cmd_addr |= off & 0x7f;
- bits = 10;
- data_len = 1;
- } else {
- cmd_addr |= off & 0x3f;
- bits = 9;
- data_len = 2;
- }
-
- dev_dbg(&edev->spi->dev, "write cmd 0x%x\n", cmd_addr);
-
- spi_message_init(&m);
- memset(t, 0, sizeof(t));
-
- t[0].tx_buf = (char *)&cmd_addr;
- t[0].len = 2;
- t[0].bits_per_word = bits;
- spi_message_add_tail(&t[0], &m);
-
- t[1].tx_buf = buf;
- t[1].len = data_len;
- t[1].bits_per_word = 8;
- spi_message_add_tail(&t[1], &m);
-
- ret = spi_sync(edev->spi, &m);
- /* have to wait program cycle time Twc ms */
- mdelay(6);
- return ret;
-}
-
-static ssize_t
-eeprom_93xx46_bin_write(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
-{
- struct eeprom_93xx46_dev *edev;
- struct device *dev;
- int i, ret, step = 1;
-
- dev = container_of(kobj, struct device, kobj);
- edev = dev_get_drvdata(dev);
-
- if (unlikely(off >= edev->bin.size))
- return 0;
- if ((off + count) > edev->bin.size)
- count = edev->bin.size - off;
- if (unlikely(!count))
- return count;
-
- /* only write even number of bytes on 16-bit devices */
- if (edev->addrlen == 6) {
- step = 2;
- count &= ~1;
- }
-
- /* erase/write enable */
- ret = eeprom_93xx46_ew(edev, 1);
- if (ret)
- return ret;
-
- mutex_lock(&edev->lock);
-
- if (edev->pdata->prepare)
- edev->pdata->prepare(edev);
-
- for (i = 0; i < count; i += step) {
- ret = eeprom_93xx46_write_word(edev, &buf[i], off + i);
- if (ret) {
- dev_err(&edev->spi->dev, "write failed at %d: %d\n",
- (int)off + i, ret);
- break;
- }
- }
-
- if (edev->pdata->finish)
- edev->pdata->finish(edev);
-
- mutex_unlock(&edev->lock);
-
- /* erase/write disable */
- eeprom_93xx46_ew(edev, 0);
- return ret ? : count;
-}
-
-static int eeprom_93xx46_eral(struct eeprom_93xx46_dev *edev)
-{
- struct eeprom_93xx46_platform_data *pd = edev->pdata;
- struct spi_message m;
- struct spi_transfer t;
- int bits, ret;
- u16 cmd_addr;
-
- cmd_addr = OP_START << edev->addrlen;
- if (edev->addrlen == 7) {
- cmd_addr |= ADDR_ERAL << 1;
- bits = 10;
- } else {
- cmd_addr |= ADDR_ERAL;
- bits = 9;
- }
-
- spi_message_init(&m);
- memset(&t, 0, sizeof(t));
-
- t.tx_buf = &cmd_addr;
- t.len = 2;
- t.bits_per_word = bits;
- spi_message_add_tail(&t, &m);
-
- mutex_lock(&edev->lock);
-
- if (edev->pdata->prepare)
- edev->pdata->prepare(edev);
-
- ret = spi_sync(edev->spi, &m);
- if (ret)
- dev_err(&edev->spi->dev, "erase error %d\n", ret);
- /* have to wait erase cycle time Tec ms */
- mdelay(6);
-
- if (pd->finish)
- pd->finish(edev);
-
- mutex_unlock(&edev->lock);
- return ret;
-}
-
-static ssize_t eeprom_93xx46_store_erase(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- struct eeprom_93xx46_dev *edev = dev_get_drvdata(dev);
- int erase = 0, ret;
-
- sscanf(buf, "%d", &erase);
- if (erase) {
- ret = eeprom_93xx46_ew(edev, 1);
- if (ret)
- return ret;
- ret = eeprom_93xx46_eral(edev);
- if (ret)
- return ret;
- ret = eeprom_93xx46_ew(edev, 0);
- if (ret)
- return ret;
- }
- return count;
-}
-static DEVICE_ATTR(erase, S_IWUSR, NULL, eeprom_93xx46_store_erase);
-
-static int __devinit eeprom_93xx46_probe(struct spi_device *spi)
-{
- struct eeprom_93xx46_platform_data *pd;
- struct eeprom_93xx46_dev *edev;
- int err;
-
- pd = spi->dev.platform_data;
- if (!pd) {
- dev_err(&spi->dev, "missing platform data\n");
- return -ENODEV;
- }
-
- edev = kzalloc(sizeof(*edev), GFP_KERNEL);
- if (!edev)
- return -ENOMEM;
-
- if (pd->flags & EE_ADDR8)
- edev->addrlen = 7;
- else if (pd->flags & EE_ADDR16)
- edev->addrlen = 6;
- else {
- dev_err(&spi->dev, "unspecified address type\n");
- err = -EINVAL;
- goto fail;
- }
-
- mutex_init(&edev->lock);
-
- edev->spi = spi_dev_get(spi);
- edev->pdata = pd;
-
- sysfs_bin_attr_init(&edev->bin);
- edev->bin.attr.name = "eeprom";
- edev->bin.attr.mode = S_IRUSR;
- edev->bin.read = eeprom_93xx46_bin_read;
- edev->bin.size = 128;
- if (!(pd->flags & EE_READONLY)) {
- edev->bin.write = eeprom_93xx46_bin_write;
- edev->bin.attr.mode |= S_IWUSR;
- }
-
- err = sysfs_create_bin_file(&spi->dev.kobj, &edev->bin);
- if (err)
- goto fail;
-
- dev_info(&spi->dev, "%d-bit eeprom %s\n",
- (pd->flags & EE_ADDR8) ? 8 : 16,
- (pd->flags & EE_READONLY) ? "(readonly)" : "");
-
- if (!(pd->flags & EE_READONLY)) {
- if (device_create_file(&spi->dev, &dev_attr_erase))
- dev_err(&spi->dev, "can't create erase interface\n");
- }
-
- dev_set_drvdata(&spi->dev, edev);
- return 0;
-fail:
- kfree(edev);
- return err;
-}
-
-static int __devexit eeprom_93xx46_remove(struct spi_device *spi)
-{
- struct eeprom_93xx46_dev *edev = dev_get_drvdata(&spi->dev);
-
- if (!(edev->pdata->flags & EE_READONLY))
- device_remove_file(&spi->dev, &dev_attr_erase);
-
- sysfs_remove_bin_file(&spi->dev.kobj, &edev->bin);
- dev_set_drvdata(&spi->dev, NULL);
- kfree(edev);
- return 0;
-}
-
-static struct spi_driver eeprom_93xx46_driver = {
- .driver = {
- .name = "93xx46",
- .owner = THIS_MODULE,
- },
- .probe = eeprom_93xx46_probe,
- .remove = __devexit_p(eeprom_93xx46_remove),
-};
-
-module_spi_driver(eeprom_93xx46_driver);
-
-MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("Driver for 93xx46 EEPROMs");
-MODULE_AUTHOR("Anatolij Gustschin <agust@denx.de>");
-MODULE_ALIAS("spi:93xx46");
generated by cgit (git 2.34.1) at 2025-02-14 04:08:53 +0000