From 2f7c68cb55ecb7331f2381deb497c27155f32faf Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Wed, 03 Jan 2024 09:43:39 +0000
Subject: [PATCH] update kernel to 5.10.198
---
kernel/drivers/misc/eeprom/at24.c | 431 ++++++++++++++++++++++++++++-------------------------
1 files changed, 228 insertions(+), 203 deletions(-)
diff --git a/kernel/drivers/misc/eeprom/at24.c b/kernel/drivers/misc/eeprom/at24.c
index 1ef7f1a..d02bf9c 100644
--- a/kernel/drivers/misc/eeprom/at24.c
+++ b/kernel/drivers/misc/eeprom/at24.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* at24.c - handle most I2C EEPROMs
*
@@ -6,26 +6,39 @@
* Copyright (C) 2008 Wolfram Sang, Pengutronix
*/
-#define DEBUG
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/of_device.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/mutex.h>
-#include <linux/mod_devicetable.h>
-#include <linux/log2.h>
-#include <linux/bitops.h>
-#include <linux/jiffies.h>
-#include <linux/property.h>
#include <linux/acpi.h>
+#include <linux/bitops.h>
+#include <linux/capability.h>
+#include <linux/delay.h>
#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
#include <linux/nvmem-provider.h>
-#include <linux/regmap.h>
-#include <linux/platform_data/at24.h>
+#include <linux/of_device.h>
#include <linux/pm_runtime.h>
-#include <linux/gpio/consumer.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+
+/* Address pointer is 16 bit. */
+#define AT24_FLAG_ADDR16 BIT(7)
+/* sysfs-entry will be read-only. */
+#define AT24_FLAG_READONLY BIT(6)
+/* sysfs-entry will be world-readable. */
+#define AT24_FLAG_IRUGO BIT(5)
+/* Take always 8 addresses (24c00). */
+#define AT24_FLAG_TAKE8ADDR BIT(4)
+/* Factory-programmed serial number. */
+#define AT24_FLAG_SERIAL BIT(3)
+/* Factory-programmed mac address. */
+#define AT24_FLAG_MAC BIT(2)
+/* Does not auto-rollover reads to the next slave address. */
+#define AT24_FLAG_NO_RDROL BIT(1)
/*
* I2C EEPROMs from most vendors are inexpensive and mostly interchangeable.
@@ -76,8 +89,8 @@
u8 flags;
struct nvmem_device *nvmem;
-
- struct gpio_desc *wp_gpio;
+ struct regulator *vcc_reg;
+ void (*read_post)(unsigned int off, char *buf, size_t count);
/*
* Some chips tie up multiple I2C addresses; dummy devices reserve
@@ -107,21 +120,44 @@
module_param_named(write_timeout, at24_write_timeout, uint, 0);
MODULE_PARM_DESC(at24_write_timeout, "Time (in ms) to try writes (default 25)");
-//Ben
struct at24_data *at24_private=NULL;
+
struct at24_chip_data {
- /*
- * these fields mirror their equivalents in
- * struct at24_platform_data
- */
u32 byte_len;
u8 flags;
+ void (*read_post)(unsigned int off, char *buf, size_t count);
};
#define AT24_CHIP_DATA(_name, _len, _flags) \
static const struct at24_chip_data _name = { \
.byte_len = _len, .flags = _flags, \
}
+
+#define AT24_CHIP_DATA_CB(_name, _len, _flags, _read_post) \
+ static const struct at24_chip_data _name = { \
+ .byte_len = _len, .flags = _flags, \
+ .read_post = _read_post, \
+ }
+
+static void at24_read_post_vaio(unsigned int off, char *buf, size_t count)
+{
+ int i;
+
+ if (capable(CAP_SYS_ADMIN))
+ return;
+
+ /*
+ * Hide VAIO private settings to regular users:
+ * - BIOS passwords: bytes 0x00 to 0x0f
+ * - UUID: bytes 0x10 to 0x1f
+ * - Serial number: 0xc0 to 0xdf
+ */
+ for (i = 0; i < count; i++) {
+ if ((off + i <= 0x1f) ||
+ (off + i >= 0xc0 && off + i <= 0xdf))
+ buf[i] = 0;
+ }
+}
/* needs 8 addresses as A0-A2 are ignored */
AT24_CHIP_DATA(at24_data_24c00, 128 / 8, AT24_FLAG_TAKE8ADDR);
@@ -139,6 +175,10 @@
/* spd is a 24c02 in memory DIMMs */
AT24_CHIP_DATA(at24_data_spd, 2048 / 8,
AT24_FLAG_READONLY | AT24_FLAG_IRUGO);
+/* 24c02_vaio is a 24c02 on some Sony laptops */
+AT24_CHIP_DATA_CB(at24_data_24c02_vaio, 2048 / 8,
+ AT24_FLAG_READONLY | AT24_FLAG_IRUGO,
+ at24_read_post_vaio);
AT24_CHIP_DATA(at24_data_24c04, 4096 / 8, 0);
AT24_CHIP_DATA(at24_data_24cs04, 16,
AT24_FLAG_SERIAL | AT24_FLAG_READONLY);
@@ -172,6 +212,7 @@
{ "24mac402", (kernel_ulong_t)&at24_data_24mac402 },
{ "24mac602", (kernel_ulong_t)&at24_data_24mac602 },
{ "spd", (kernel_ulong_t)&at24_data_spd },
+ { "24c02-vaio", (kernel_ulong_t)&at24_data_24c02_vaio },
{ "24c04", (kernel_ulong_t)&at24_data_24c04 },
{ "24cs04", (kernel_ulong_t)&at24_data_24cs04 },
{ "24c08", (kernel_ulong_t)&at24_data_24c08 },
@@ -220,8 +261,9 @@
};
MODULE_DEVICE_TABLE(of, at24_of_match);
-static const struct acpi_device_id at24_acpi_ids[] = {
+static const struct acpi_device_id __maybe_unused at24_acpi_ids[] = {
{ "INT3499", (kernel_ulong_t)&at24_data_INT3499 },
+ { "TPF0001", (kernel_ulong_t)&at24_data_24c1024 },
{ /* END OF LIST */ }
};
MODULE_DEVICE_TABLE(acpi, at24_acpi_ids);
@@ -382,7 +424,7 @@
struct at24_data *at24;
struct device *dev;
char *buf = val;
- int ret;
+ int i, ret;
at24 = priv;
dev = at24_base_client_dev(at24);
@@ -405,26 +447,27 @@
*/
mutex_lock(&at24->lock);
- while (count) {
- ret = at24_regmap_read(at24, buf, off, count);
+ for (i = 0; count; i += ret, count -= ret) {
+ ret = at24_regmap_read(at24, buf + i, off + i, count);
if (ret < 0) {
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
return ret;
}
- buf += ret;
- off += ret;
- count -= ret;
}
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
+ if (unlikely(at24->read_post))
+ at24->read_post(off, buf, i);
+
return 0;
}
-//add ben
+
+
static ssize_t at24_read_private(struct at24_data *at24,
char *buf, loff_t off, size_t count)
{
@@ -564,33 +607,6 @@
}
EXPORT_SYMBOL(at24_mac1_read);
-ssize_t at24_mac2_read(unsigned char* mac)
-{
- char buf[20];
- char buf_tmp[12];
- ssize_t ret;
- if (at24_private == NULL)
- {
- printk("zcl: at24_mac_read at24_private==null error");
- return 0;
- }
- memset(buf, 0x00, 20);
- memset(buf_tmp, 0x00, 12);
- ret = at24_read_private(at24_private, buf, 0x20, 6);
- if (ret > 0)
- {
- *mac = buf[0];
- *(mac + 1) = buf[1];
- *(mac + 2) = buf[2];
- *(mac + 3) = buf[3];
- *(mac + 4) = buf[4];
- *(mac + 5) = buf[5];
- }
- printk("at24_mac2_read ...............\n");
- return ret;
-}
-EXPORT_SYMBOL(at24_mac2_read);
-
static int at24_write(void *priv, unsigned int off, void *val, size_t count)
{
struct at24_data *at24;
@@ -618,12 +634,10 @@
* from this host, but not from other I2C masters.
*/
mutex_lock(&at24->lock);
- gpiod_set_value_cansleep(at24->wp_gpio, 0);
while (count) {
ret = at24_regmap_write(at24, buf, off, count);
if (ret < 0) {
- gpiod_set_value_cansleep(at24->wp_gpio, 1);
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
return ret;
@@ -633,7 +647,6 @@
count -= ret;
}
- gpiod_set_value_cansleep(at24->wp_gpio, 1);
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
@@ -641,63 +654,11 @@
return 0;
}
-static void at24_properties_to_pdata(struct device *dev,
- struct at24_platform_data *chip)
-{
- int err;
- u32 val;
-
- if (device_property_present(dev, "read-only"))
- chip->flags |= AT24_FLAG_READONLY;
- if (device_property_present(dev, "no-read-rollover"))
- chip->flags |= AT24_FLAG_NO_RDROL;
-
- err = device_property_read_u32(dev, "address-width", &val);
- if (!err) {
- switch (val) {
- case 8:
- if (chip->flags & AT24_FLAG_ADDR16)
- dev_warn(dev, "Override address width to be 8, while default is 16\n");
- chip->flags &= ~AT24_FLAG_ADDR16;
- break;
- case 16:
- chip->flags |= AT24_FLAG_ADDR16;
- break;
- default:
- dev_warn(dev, "Bad \"address-width\" property: %u\n",
- val);
- }
- }
-
- err = device_property_read_u32(dev, "size", &val);
- if (!err)
- chip->byte_len = val;
-
- err = device_property_read_u32(dev, "pagesize", &val);
- if (!err) {
- chip->page_size = val;
- } else {
- /*
- * This is slow, but we can't know all eeproms, so we better
- * play safe. Specifying custom eeprom-types via platform_data
- * is recommended anyhow.
- */
- chip->page_size = 1;
- }
-}
-
-static int at24_get_pdata(struct device *dev, struct at24_platform_data *pdata)
+static const struct at24_chip_data *at24_get_chip_data(struct device *dev)
{
struct device_node *of_node = dev->of_node;
const struct at24_chip_data *cdata;
const struct i2c_device_id *id;
- struct at24_platform_data *pd;
-
- pd = dev_get_platdata(dev);
- if (pd) {
- memcpy(pdata, pd, sizeof(*pdata));
- return 0;
- }
id = i2c_match_id(at24_ids, to_i2c_client(dev));
@@ -714,47 +675,29 @@
cdata = acpi_device_get_match_data(dev);
if (!cdata)
- return -ENODEV;
+ return ERR_PTR(-ENODEV);
- pdata->byte_len = cdata->byte_len;
- pdata->flags = cdata->flags;
- at24_properties_to_pdata(dev, pdata);
-
- return 0;
-}
-
-static void at24_remove_dummy_clients(struct at24_data *at24)
-{
- int i;
-
- for (i = 1; i < at24->num_addresses; i++)
- i2c_unregister_device(at24->client[i].client);
+ return cdata;
}
static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
struct regmap_config *regmap_config)
{
struct i2c_client *base_client, *dummy_client;
- unsigned short int addr;
struct regmap *regmap;
struct device *dev;
base_client = at24->client[0].client;
dev = &base_client->dev;
- addr = base_client->addr + index;
- dummy_client = i2c_new_dummy(base_client->adapter,
- base_client->addr + index);
- if (!dummy_client) {
- dev_err(dev, "address 0x%02x unavailable\n", addr);
- return -EADDRINUSE;
- }
+ dummy_client = devm_i2c_new_dummy_device(dev, base_client->adapter,
+ base_client->addr + index);
+ if (IS_ERR(dummy_client))
+ return PTR_ERR(dummy_client);
regmap = devm_regmap_init_i2c(dummy_client, regmap_config);
- if (IS_ERR(regmap)) {
- i2c_unregister_device(dummy_client);
+ if (IS_ERR(regmap))
return PTR_ERR(regmap);
- }
at24->client[index].client = dummy_client;
at24->client[index].regmap = regmap;
@@ -789,80 +732,120 @@
{
struct regmap_config regmap_config = { };
struct nvmem_config nvmem_config = { };
- struct at24_platform_data pdata = { };
+ u32 byte_len, page_size, flags, addrw;
+ const struct at24_chip_data *cdata;
struct device *dev = &client->dev;
bool i2c_fn_i2c, i2c_fn_block;
unsigned int i, num_addresses;
struct at24_data *at24;
struct regmap *regmap;
- size_t at24_size;
bool writable;
u8 test_byte;
int err;
- printk("ben %s ...\n", __func__);
i2c_fn_i2c = i2c_check_functionality(client->adapter, I2C_FUNC_I2C);
i2c_fn_block = i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK);
- err = at24_get_pdata(dev, &pdata);
+ cdata = at24_get_chip_data(dev);
+ if (IS_ERR(cdata))
+ return PTR_ERR(cdata);
+
+ err = device_property_read_u32(dev, "pagesize", &page_size);
if (err)
- return err;
+ /*
+ * This is slow, but we can't know all eeproms, so we better
+ * play safe. Specifying custom eeprom-types via device tree
+ * or properties is recommended anyhow.
+ */
+ page_size = 1;
+
+ flags = cdata->flags;
+ if (device_property_present(dev, "read-only"))
+ flags |= AT24_FLAG_READONLY;
+ if (device_property_present(dev, "no-read-rollover"))
+ flags |= AT24_FLAG_NO_RDROL;
+
+ err = device_property_read_u32(dev, "address-width", &addrw);
+ if (!err) {
+ switch (addrw) {
+ case 8:
+ if (flags & AT24_FLAG_ADDR16)
+ dev_warn(dev,
+ "Override address width to be 8, while default is 16\n");
+ flags &= ~AT24_FLAG_ADDR16;
+ break;
+ case 16:
+ flags |= AT24_FLAG_ADDR16;
+ break;
+ default:
+ dev_warn(dev, "Bad \"address-width\" property: %u\n",
+ addrw);
+ }
+ }
+
+ err = device_property_read_u32(dev, "size", &byte_len);
+ if (err)
+ byte_len = cdata->byte_len;
if (!i2c_fn_i2c && !i2c_fn_block)
- pdata.page_size = 1;
+ page_size = 1;
- if (!pdata.page_size) {
+ if (!page_size) {
dev_err(dev, "page_size must not be 0!\n");
return -EINVAL;
}
- if (!is_power_of_2(pdata.page_size))
+ if (!is_power_of_2(page_size))
dev_warn(dev, "page_size looks suspicious (no power of 2)!\n");
- if (pdata.flags & AT24_FLAG_TAKE8ADDR)
- num_addresses = 8;
- else
- num_addresses = DIV_ROUND_UP(pdata.byte_len,
- (pdata.flags & AT24_FLAG_ADDR16) ? 65536 : 256);
+ err = device_property_read_u32(dev, "num-addresses", &num_addresses);
+ if (err) {
+ if (flags & AT24_FLAG_TAKE8ADDR)
+ num_addresses = 8;
+ else
+ num_addresses = DIV_ROUND_UP(byte_len,
+ (flags & AT24_FLAG_ADDR16) ? 65536 : 256);
+ }
- if ((pdata.flags & AT24_FLAG_SERIAL) && (pdata.flags & AT24_FLAG_MAC)) {
+ if ((flags & AT24_FLAG_SERIAL) && (flags & AT24_FLAG_MAC)) {
dev_err(dev,
"invalid device data - cannot have both AT24_FLAG_SERIAL & AT24_FLAG_MAC.");
return -EINVAL;
}
regmap_config.val_bits = 8;
- regmap_config.reg_bits = (pdata.flags & AT24_FLAG_ADDR16) ? 16 : 8;
+ regmap_config.reg_bits = (flags & AT24_FLAG_ADDR16) ? 16 : 8;
regmap_config.disable_locking = true;
regmap = devm_regmap_init_i2c(client, ®map_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
- at24_size = sizeof(*at24) + num_addresses * sizeof(struct at24_client);
- at24 = devm_kzalloc(dev, at24_size, GFP_KERNEL);
+ at24 = devm_kzalloc(dev, struct_size(at24, client, num_addresses),
+ GFP_KERNEL);
if (!at24)
return -ENOMEM;
at24_private = at24;
mutex_init(&at24->lock);
- at24->byte_len = pdata.byte_len;
- at24->page_size = pdata.page_size;
- at24->flags = pdata.flags;
+ at24->byte_len = byte_len;
+ at24->page_size = page_size;
+ at24->flags = flags;
+ at24->read_post = cdata->read_post;
at24->num_addresses = num_addresses;
- at24->offset_adj = at24_get_offset_adj(pdata.flags, pdata.byte_len);
+ at24->offset_adj = at24_get_offset_adj(flags, byte_len);
at24->client[0].client = client;
at24->client[0].regmap = regmap;
- at24->wp_gpio = devm_gpiod_get_optional(dev, "wp", GPIOD_OUT_HIGH);
- if (IS_ERR(at24->wp_gpio))
- return PTR_ERR(at24->wp_gpio);
+ at24->vcc_reg = devm_regulator_get(dev, "vcc");
+ if (IS_ERR(at24->vcc_reg))
+ return PTR_ERR(at24->vcc_reg);
- writable = !(pdata.flags & AT24_FLAG_READONLY);
+ writable = !(flags & AT24_FLAG_READONLY);
if (writable) {
at24->write_max = min_t(unsigned int,
- pdata.page_size, at24_io_limit);
+ page_size, at24_io_limit);
if (!i2c_fn_i2c && at24->write_max > I2C_SMBUS_BLOCK_MAX)
at24->write_max = I2C_SMBUS_BLOCK_MAX;
}
@@ -870,33 +853,32 @@
/* use dummy devices for multiple-address chips */
for (i = 1; i < num_addresses; i++) {
err = at24_make_dummy_client(at24, i, ®map_config);
- if (err) {
- at24_remove_dummy_clients(at24);
+ if (err)
return err;
- }
}
-
- i2c_set_clientdata(client, at24);
-
- /* enable runtime pm */
- pm_runtime_set_active(dev);
- pm_runtime_enable(dev);
/*
- * Perform a one-byte test read to verify that the
- * chip is functional.
+ * We initialize nvmem_config.id to NVMEM_DEVID_AUTO even if the
+ * label property is set as some platform can have multiple eeproms
+ * with same label and we can not register each of those with same
+ * label. Failing to register those eeproms trigger cascade failure
+ * on such platform.
*/
- err = at24_read(at24, 0, &test_byte, 1);
- pm_runtime_idle(dev);
- if (err) {
- err = -ENODEV;
- goto err_clients;
+ nvmem_config.id = NVMEM_DEVID_AUTO;
+
+ if (device_property_present(dev, "label")) {
+ err = device_property_read_string(dev, "label",
+ &nvmem_config.name);
+ if (err)
+ return err;
+ } else {
+ nvmem_config.name = dev_name(dev);
}
- nvmem_config.name = dev_name(dev);
+ nvmem_config.type = NVMEM_TYPE_EEPROM;
nvmem_config.dev = dev;
nvmem_config.read_only = !writable;
- nvmem_config.root_only = !(pdata.flags & AT24_FLAG_IRUGO);
+ nvmem_config.root_only = !(flags & AT24_FLAG_IRUGO);
nvmem_config.owner = THIS_MODULE;
nvmem_config.compat = true;
nvmem_config.base_dev = dev;
@@ -905,47 +887,90 @@
nvmem_config.priv = at24;
nvmem_config.stride = 1;
nvmem_config.word_size = 1;
- nvmem_config.size = pdata.byte_len;
+ nvmem_config.size = byte_len;
+
+ i2c_set_clientdata(client, at24);
+
+ err = regulator_enable(at24->vcc_reg);
+ if (err) {
+ dev_err(dev, "Failed to enable vcc regulator\n");
+ return err;
+ }
+
+ /* enable runtime pm */
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
if (IS_ERR(at24->nvmem)) {
- err = PTR_ERR(at24->nvmem);
- goto err_clients;
+ pm_runtime_disable(dev);
+ if (!pm_runtime_status_suspended(dev))
+ regulator_disable(at24->vcc_reg);
+ return PTR_ERR(at24->nvmem);
}
- dev_info(dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
- pdata.byte_len, client->name,
- writable ? "writable" : "read-only", at24->write_max);
+ /*
+ * Perform a one-byte test read to verify that the
+ * chip is functional.
+ */
+ err = at24_read(at24, 0, &test_byte, 1);
+ if (err) {
+ pm_runtime_disable(dev);
+ if (!pm_runtime_status_suspended(dev))
+ regulator_disable(at24->vcc_reg);
+ return -ENODEV;
+ }
- /* export data to kernel code */
- if (pdata.setup)
- pdata.setup(at24->nvmem, pdata.context);
+ pm_runtime_idle(dev);
+
+ if (writable)
+ dev_info(dev, "%u byte %s EEPROM, writable, %u bytes/write\n",
+ byte_len, client->name, at24->write_max);
+ else
+ dev_info(dev, "%u byte %s EEPROM, read-only\n",
+ byte_len, client->name);
return 0;
-
-err_clients:
- at24_remove_dummy_clients(at24);
- pm_runtime_disable(dev);
-
- return err;
}
static int at24_remove(struct i2c_client *client)
{
- struct at24_data *at24;
+ struct at24_data *at24 = i2c_get_clientdata(client);
- at24 = i2c_get_clientdata(client);
-
- at24_remove_dummy_clients(at24);
pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ regulator_disable(at24->vcc_reg);
pm_runtime_set_suspended(&client->dev);
return 0;
}
+static int __maybe_unused at24_suspend(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct at24_data *at24 = i2c_get_clientdata(client);
+
+ return regulator_disable(at24->vcc_reg);
+}
+
+static int __maybe_unused at24_resume(struct device *dev)
+{
+ struct i2c_client *client = to_i2c_client(dev);
+ struct at24_data *at24 = i2c_get_clientdata(client);
+
+ return regulator_enable(at24->vcc_reg);
+}
+
+static const struct dev_pm_ops at24_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(at24_suspend, at24_resume, NULL)
+};
+
static struct i2c_driver at24_driver = {
.driver = {
.name = "at24",
+ .pm = &at24_pm_ops,
.of_match_table = at24_of_match,
.acpi_match_table = ACPI_PTR(at24_acpi_ids),
},
--
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