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path: root/drivers/misc/eeprom/at24.c
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Diffstat (limited to 'drivers/misc/eeprom/at24.c')
-rw-r--r--drivers/misc/eeprom/at24.c551
1 files changed, 312 insertions, 239 deletions
diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
index ddfcf4ade7bf..f721825199ce 100644
--- a/drivers/misc/eeprom/at24.c
+++ b/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
*
@@ -6,25 +6,38 @@
* Copyright (C) 2008 Wolfram Sang, Pengutronix
*/
-#include <linux/kernel.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/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/i2c.h>
#include <linux/nvmem-provider.h>
-#include <linux/regmap.h>
-#include <linux/platform_data/at24.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.
@@ -54,11 +67,6 @@
* which won't work on pure SMBus systems.
*/
-struct at24_client {
- struct i2c_client *client;
- struct regmap *regmap;
-};
-
struct at24_data {
/*
* Lock protects against activities from other Linux tasks,
@@ -75,14 +83,15 @@ struct at24_data {
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
- * them for us, and we'll use them with SMBus calls.
+ * them for us.
*/
- struct at24_client client[];
+ u8 bank_addr_shift;
+ struct regmap *client_regmaps[] __counted_by(num_addresses);
};
/*
@@ -107,12 +116,10 @@ module_param_named(write_timeout, at24_write_timeout, uint, 0);
MODULE_PARM_DESC(at24_write_timeout, "Time (in ms) to try writes (default 25)");
struct at24_chip_data {
- /*
- * these fields mirror their equivalents in
- * struct at24_platform_data
- */
u32 byte_len;
u8 flags;
+ u8 bank_addr_shift;
+ void (*read_post)(unsigned int off, char *buf, size_t count);
};
#define AT24_CHIP_DATA(_name, _len, _flags) \
@@ -120,6 +127,38 @@ struct at24_chip_data {
.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, \
+ }
+
+#define AT24_CHIP_DATA_BS(_name, _len, _flags, _bank_addr_shift) \
+ static const struct at24_chip_data _name = { \
+ .byte_len = _len, .flags = _flags, \
+ .bank_addr_shift = _bank_addr_shift \
+ }
+
+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);
/* old variants can't be handled with this generic entry! */
@@ -133,9 +172,17 @@ AT24_CHIP_DATA(at24_data_24mac402, 48 / 8,
AT24_FLAG_MAC | AT24_FLAG_READONLY);
AT24_CHIP_DATA(at24_data_24mac602, 64 / 8,
AT24_FLAG_MAC | AT24_FLAG_READONLY);
+AT24_CHIP_DATA(at24_data_24aa025e48, 48 / 8,
+ AT24_FLAG_READONLY);
+AT24_CHIP_DATA(at24_data_24aa025e64, 64 / 8,
+ AT24_FLAG_READONLY);
/* 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);
@@ -147,15 +194,22 @@ AT24_CHIP_DATA(at24_data_24c16, 16384 / 8, 0);
AT24_CHIP_DATA(at24_data_24cs16, 16,
AT24_FLAG_SERIAL | AT24_FLAG_READONLY);
AT24_CHIP_DATA(at24_data_24c32, 32768 / 8, AT24_FLAG_ADDR16);
+/* M24C32-D Additional Write lockable page (M24C32-D order codes) */
+AT24_CHIP_DATA(at24_data_24c32d_wlp, 32, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24cs32, 16,
AT24_FLAG_ADDR16 | AT24_FLAG_SERIAL | AT24_FLAG_READONLY);
AT24_CHIP_DATA(at24_data_24c64, 65536 / 8, AT24_FLAG_ADDR16);
+/* M24C64-D Additional Write lockable page (M24C64-D order codes) */
+AT24_CHIP_DATA(at24_data_24c64d_wlp, 32, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24cs64, 16,
AT24_FLAG_ADDR16 | AT24_FLAG_SERIAL | AT24_FLAG_READONLY);
AT24_CHIP_DATA(at24_data_24c128, 131072 / 8, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24c256, 262144 / 8, AT24_FLAG_ADDR16);
+/* M24256E Additional Write lockable page (M24256E-F order codes) */
+AT24_CHIP_DATA(at24_data_24256e_wlp, 64, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24c512, 524288 / 8, AT24_FLAG_ADDR16);
AT24_CHIP_DATA(at24_data_24c1024, 1048576 / 8, AT24_FLAG_ADDR16);
+AT24_CHIP_DATA_BS(at24_data_24c1025, 1048576 / 8, AT24_FLAG_ADDR16, 2);
AT24_CHIP_DATA(at24_data_24c2048, 2097152 / 8, AT24_FLAG_ADDR16);
/* identical to 24c08 ? */
AT24_CHIP_DATA(at24_data_INT3499, 8192 / 8, 0);
@@ -168,7 +222,10 @@ static const struct i2c_device_id at24_ids[] = {
{ "24cs02", (kernel_ulong_t)&at24_data_24cs02 },
{ "24mac402", (kernel_ulong_t)&at24_data_24mac402 },
{ "24mac602", (kernel_ulong_t)&at24_data_24mac602 },
+ { "24aa025e48", (kernel_ulong_t)&at24_data_24aa025e48 },
+ { "24aa025e64", (kernel_ulong_t)&at24_data_24aa025e64 },
{ "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 },
@@ -176,13 +233,17 @@ static const struct i2c_device_id at24_ids[] = {
{ "24c16", (kernel_ulong_t)&at24_data_24c16 },
{ "24cs16", (kernel_ulong_t)&at24_data_24cs16 },
{ "24c32", (kernel_ulong_t)&at24_data_24c32 },
+ { "24c32d-wl", (kernel_ulong_t)&at24_data_24c32d_wlp },
{ "24cs32", (kernel_ulong_t)&at24_data_24cs32 },
{ "24c64", (kernel_ulong_t)&at24_data_24c64 },
+ { "24c64-wl", (kernel_ulong_t)&at24_data_24c64d_wlp },
{ "24cs64", (kernel_ulong_t)&at24_data_24cs64 },
{ "24c128", (kernel_ulong_t)&at24_data_24c128 },
{ "24c256", (kernel_ulong_t)&at24_data_24c256 },
+ { "24256e-wl", (kernel_ulong_t)&at24_data_24256e_wlp },
{ "24c512", (kernel_ulong_t)&at24_data_24c512 },
{ "24c1024", (kernel_ulong_t)&at24_data_24c1024 },
+ { "24c1025", (kernel_ulong_t)&at24_data_24c1025 },
{ "24c2048", (kernel_ulong_t)&at24_data_24c2048 },
{ "at24", 0 },
{ /* END OF LIST */ }
@@ -205,20 +266,27 @@ static const struct of_device_id at24_of_match[] = {
{ .compatible = "atmel,24c16", .data = &at24_data_24c16 },
{ .compatible = "atmel,24cs16", .data = &at24_data_24cs16 },
{ .compatible = "atmel,24c32", .data = &at24_data_24c32 },
+ { .compatible = "atmel,24c32d-wl", .data = &at24_data_24c32d_wlp },
{ .compatible = "atmel,24cs32", .data = &at24_data_24cs32 },
{ .compatible = "atmel,24c64", .data = &at24_data_24c64 },
+ { .compatible = "atmel,24c64d-wl", .data = &at24_data_24c64d_wlp },
{ .compatible = "atmel,24cs64", .data = &at24_data_24cs64 },
{ .compatible = "atmel,24c128", .data = &at24_data_24c128 },
{ .compatible = "atmel,24c256", .data = &at24_data_24c256 },
{ .compatible = "atmel,24c512", .data = &at24_data_24c512 },
{ .compatible = "atmel,24c1024", .data = &at24_data_24c1024 },
+ { .compatible = "atmel,24c1025", .data = &at24_data_24c1025 },
{ .compatible = "atmel,24c2048", .data = &at24_data_24c2048 },
+ { .compatible = "microchip,24aa025e48", .data = &at24_data_24aa025e48 },
+ { .compatible = "microchip,24aa025e64", .data = &at24_data_24aa025e64 },
+ { .compatible = "st,24256e-wl", .data = &at24_data_24256e_wlp },
{ /* END OF LIST */ },
};
MODULE_DEVICE_TABLE(of, at24_of_match);
static const struct acpi_device_id 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);
@@ -232,8 +300,8 @@ MODULE_DEVICE_TABLE(acpi, at24_acpi_ids);
* set the byte address; on a multi-master board, another master
* may have changed the chip's "current" address pointer.
*/
-static struct at24_client *at24_translate_offset(struct at24_data *at24,
- unsigned int *offset)
+static struct regmap *at24_translate_offset(struct at24_data *at24,
+ unsigned int *offset)
{
unsigned int i;
@@ -245,12 +313,12 @@ static struct at24_client *at24_translate_offset(struct at24_data *at24,
*offset &= 0xff;
}
- return &at24->client[i];
+ return at24->client_regmaps[i];
}
static struct device *at24_base_client_dev(struct at24_data *at24)
{
- return &at24->client[0].client->dev;
+ return regmap_get_device(at24->client_regmaps[0]);
}
static size_t at24_adjust_read_count(struct at24_data *at24,
@@ -281,14 +349,10 @@ static ssize_t at24_regmap_read(struct at24_data *at24, char *buf,
unsigned int offset, size_t count)
{
unsigned long timeout, read_time;
- struct at24_client *at24_client;
- struct i2c_client *client;
struct regmap *regmap;
int ret;
- at24_client = at24_translate_offset(at24, &offset);
- regmap = at24_client->regmap;
- client = at24_client->client;
+ regmap = at24_translate_offset(at24, &offset);
count = at24_adjust_read_count(at24, offset, count);
/* adjust offset for mac and serial read ops */
@@ -303,7 +367,7 @@ static ssize_t at24_regmap_read(struct at24_data *at24, char *buf,
read_time = jiffies;
ret = regmap_bulk_read(regmap, offset, buf, count);
- dev_dbg(&client->dev, "read %zu@%d --> %d (%ld)\n",
+ dev_dbg(regmap_get_device(regmap), "read %zu@%d --> %d (%ld)\n",
count, offset, ret, jiffies);
if (!ret)
return count;
@@ -344,14 +408,10 @@ static ssize_t at24_regmap_write(struct at24_data *at24, const char *buf,
unsigned int offset, size_t count)
{
unsigned long timeout, write_time;
- struct at24_client *at24_client;
- struct i2c_client *client;
struct regmap *regmap;
int ret;
- at24_client = at24_translate_offset(at24, &offset);
- regmap = at24_client->regmap;
- client = at24_client->client;
+ regmap = at24_translate_offset(at24, &offset);
count = at24_adjust_write_count(at24, offset, count);
timeout = jiffies + msecs_to_jiffies(at24_write_timeout);
@@ -363,7 +423,7 @@ static ssize_t at24_regmap_write(struct at24_data *at24, const char *buf,
write_time = jiffies;
ret = regmap_bulk_write(regmap, offset, buf, count);
- dev_dbg(&client->dev, "write %zu@%d --> %d (%ld)\n",
+ dev_dbg(regmap_get_device(regmap), "write %zu@%d --> %d (%ld)\n",
count, offset, ret, jiffies);
if (!ret)
return count;
@@ -379,7 +439,7 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
struct at24_data *at24;
struct device *dev;
char *buf = val;
- int ret;
+ int i, ret;
at24 = priv;
dev = at24_base_client_dev(at24);
@@ -390,34 +450,31 @@ static int at24_read(void *priv, unsigned int off, void *val, size_t count)
if (off + count > at24->byte_len)
return -EINVAL;
- ret = pm_runtime_get_sync(dev);
- if (ret < 0) {
- pm_runtime_put_noidle(dev);
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
return ret;
- }
-
/*
* Read data from chip, protecting against concurrent updates
* from this host, but not from other I2C masters.
*/
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;
}
@@ -437,23 +494,18 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
if (off + count > at24->byte_len)
return -EINVAL;
- ret = pm_runtime_get_sync(dev);
- if (ret < 0) {
- pm_runtime_put_noidle(dev);
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
return ret;
- }
-
/*
* Write data to chip, protecting against concurrent updates
* 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;
@@ -463,7 +515,6 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
count -= ret;
}
- gpiod_set_value_cansleep(at24->wp_gpio, 1);
mutex_unlock(&at24->lock);
pm_runtime_put(dev);
@@ -471,123 +522,25 @@ static int at24_write(void *priv, unsigned int off, void *val, size_t count)
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)
-{
- 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));
-
- /*
- * The I2C core allows OF nodes compatibles to match against the
- * I2C device ID table as a fallback, so check not only if an OF
- * node is present but also if it matches an OF device ID entry.
- */
- if (of_node && of_match_device(at24_of_match, dev))
- cdata = of_device_get_match_data(dev);
- else if (id)
- cdata = (void *)id->driver_data;
- else
- cdata = acpi_device_get_match_data(dev);
-
- if (!cdata)
- return -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);
-}
-
static int at24_make_dummy_client(struct at24_data *at24, unsigned int index,
+ struct i2c_client *base_client,
struct regmap_config *regmap_config)
{
- struct i2c_client *base_client, *dummy_client;
- unsigned short int addr;
+ struct i2c_client *dummy_client;
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(&base_client->dev,
+ base_client->adapter,
+ base_client->addr +
+ (index << at24->bank_addr_shift));
+ 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;
+ at24->client_regmaps[index] = regmap;
return 0;
}
@@ -615,17 +568,43 @@ static unsigned int at24_get_offset_adj(u8 flags, unsigned int byte_len)
}
}
+static void at24_probe_temp_sensor(struct i2c_client *client)
+{
+ struct at24_data *at24 = i2c_get_clientdata(client);
+ struct i2c_board_info info = { .type = "jc42" };
+ int ret;
+ u8 val;
+
+ /*
+ * Byte 2 has value 11 for DDR3, earlier versions don't
+ * support the thermal sensor present flag
+ */
+ ret = at24_read(at24, 2, &val, 1);
+ if (ret || val != 11)
+ return;
+
+ /* Byte 32, bit 7 is set if temp sensor is present */
+ ret = at24_read(at24, 32, &val, 1);
+ if (ret || !(val & BIT(7)))
+ return;
+
+ info.addr = 0x18 | (client->addr & 7);
+
+ i2c_new_client_device(client->adapter, &info);
+}
+
static int at24_probe(struct i2c_client *client)
{
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;
+ bool full_power;
struct regmap *regmap;
- size_t at24_size;
bool writable;
u8 test_byte;
int err;
@@ -634,97 +613,137 @@ static int at24_probe(struct i2c_client *client)
i2c_fn_block = i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WRITE_I2C_BLOCK);
- err = at24_get_pdata(dev, &pdata);
+ cdata = i2c_get_match_data(client);
+ if (!cdata)
+ return -ENODEV;
+
+ 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, &regmap_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_regmaps, num_addresses),
+ GFP_KERNEL);
if (!at24)
return -ENOMEM;
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->bank_addr_shift = cdata->bank_addr_shift;
at24->num_addresses = num_addresses;
- at24->offset_adj = at24_get_offset_adj(pdata.flags, pdata.byte_len);
- at24->client[0].client = client;
- at24->client[0].regmap = regmap;
+ at24->offset_adj = at24_get_offset_adj(flags, byte_len);
+ at24->client_regmaps[0] = 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;
}
/* use dummy devices for multiple-address chips */
for (i = 1; i < num_addresses; i++) {
- err = at24_make_dummy_client(at24, i, &regmap_config);
- if (err) {
- at24_remove_dummy_clients(at24);
+ err = at24_make_dummy_client(at24, i, client, &regmap_config);
+ 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 = true;
+ nvmem_config.root_only = !(flags & AT24_FLAG_IRUGO);
nvmem_config.owner = THIS_MODULE;
nvmem_config.compat = true;
nvmem_config.base_dev = dev;
@@ -733,53 +752,107 @@ static int at24_probe(struct i2c_client *client)
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);
+
+ full_power = acpi_dev_state_d0(&client->dev);
+ if (full_power) {
+ err = regulator_enable(at24->vcc_reg);
+ if (err) {
+ dev_err(dev, "Failed to enable vcc regulator\n");
+ return err;
+ }
+
+ pm_runtime_set_active(dev);
+ }
+ pm_runtime_enable(dev);
+
+ /*
+ * Perform a one-byte test read to verify that the chip is functional,
+ * unless powering on the device is to be avoided during probe (i.e.
+ * it's powered off right now).
+ */
+ if (full_power) {
+ 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;
+ }
+ }
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 dev_err_probe(dev, PTR_ERR(at24->nvmem),
+ "failed to register nvmem\n");
}
- dev_info(dev, "%u byte %s EEPROM, %s, %u bytes/write\n",
- pdata.byte_len, client->name,
- writable ? "writable" : "read-only", at24->write_max);
+ /* If this a SPD EEPROM, probe for DDR3 thermal sensor */
+ if (cdata == &at24_data_spd)
+ at24_probe_temp_sensor(client);
- /* 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);
+static void at24_remove(struct i2c_client *client)
+{
+ struct at24_data *at24 = i2c_get_clientdata(client);
- return err;
+ pm_runtime_disable(&client->dev);
+ if (acpi_dev_state_d0(&client->dev)) {
+ if (!pm_runtime_status_suspended(&client->dev))
+ regulator_disable(at24->vcc_reg);
+ pm_runtime_set_suspended(&client->dev);
+ }
}
-static int at24_remove(struct i2c_client *client)
+static int __maybe_unused at24_suspend(struct device *dev)
{
- struct at24_data *at24;
+ struct i2c_client *client = to_i2c_client(dev);
+ struct at24_data *at24 = i2c_get_clientdata(client);
- at24 = i2c_get_clientdata(client);
+ return regulator_disable(at24->vcc_reg);
+}
- at24_remove_dummy_clients(at24);
- pm_runtime_disable(&client->dev);
- pm_runtime_set_suspended(&client->dev);
+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 0;
+ 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),
+ .acpi_match_table = at24_acpi_ids,
},
- .probe_new = at24_probe,
+ .probe = at24_probe,
.remove = at24_remove,
.id_table = at24_ids,
+ .flags = I2C_DRV_ACPI_WAIVE_D0_PROBE,
};
static int __init at24_init(void)
generated by cgit (git 2.34.1) at 2025-12-24 20:21:43 +0000