diff options
Diffstat (limited to 'target/linux/generic-2.6/patches-2.6.28/450-i2c_at24_add_kernel_interface_read_write.patch')
| -rw-r--r-- | target/linux/generic-2.6/patches-2.6.28/450-i2c_at24_add_kernel_interface_read_write.patch | 134 |
1 files changed, 0 insertions, 134 deletions
diff --git a/target/linux/generic-2.6/patches-2.6.28/450-i2c_at24_add_kernel_interface_read_write.patch b/target/linux/generic-2.6/patches-2.6.28/450-i2c_at24_add_kernel_interface_read_write.patch deleted file mode 100644 index e360db0e2d..0000000000 --- a/target/linux/generic-2.6/patches-2.6.28/450-i2c_at24_add_kernel_interface_read_write.patch +++ /dev/null @@ -1,134 +0,0 @@ -Subject: [PATCH 2/3] I2C: at24: add kernel interface for reading/writing EEPROM -Date: Monday 25 August 2008 -From: Kevin Hilman <khilman@deeprootsystems.com> -To: davinci-linux-open-source@linux.davincidsp.com - -This patch adds an interface by which other kernel code can read/write -detected EEPROM. - -The platform code registers a 'setup' callback with the -at24_platform_data. When the at24 driver detects an EEPROM, it fills -out the read and write functions of at24_iface and calls the setup -callback. The platform code can then use the read/write functions in -the at24_iface struct for reading and writing the EEPROM. - -Original idea, review and updates by David Brownell <david-b@pacbell.net> - -Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com> ---- - drivers/i2c/chips/at24.c | 42 +++++++++++++++++++++++++++++++++++------- - include/linux/i2c/at24.h | 10 ++++++++++ - 2 files changed, 45 insertions(+), 7 deletions(-) - ---- a/drivers/i2c/chips/at24.c -+++ b/drivers/i2c/chips/at24.c -@@ -53,6 +53,7 @@ - - struct at24_data { - struct at24_platform_data chip; -+ struct at24_iface iface; - bool use_smbus; - - /* -@@ -264,13 +265,6 @@ static ssize_t at24_bin_read(struct kobj - - - /* -- * REVISIT: export at24_bin{read,write}() to let other kernel code use -- * eeprom data. For example, it might hold a board's Ethernet address, or -- * board-specific calibration data generated on the manufacturing floor. -- */ -- -- --/* - * Note that if the hardware write-protect pin is pulled high, the whole - * chip is normally write protected. But there are plenty of product - * variants here, including OTP fuses and partial chip protect. -@@ -386,6 +380,30 @@ static ssize_t at24_bin_write(struct kob - - /*-------------------------------------------------------------------------*/ - -+/* -+ * This lets other kernel code access the eeprom data. For example, it -+ * might hold a board's Ethernet address, or board-specific calibration -+ * data generated on the manufacturing floor. -+ */ -+ -+static ssize_t at24_iface_read(struct at24_iface *iface, char *buf, -+ off_t offset, size_t count) -+{ -+ struct at24_data *at24 = container_of(iface, struct at24_data, iface); -+ -+ return at24_eeprom_read(at24, buf, offset, count); -+} -+ -+static ssize_t at24_iface_write(struct at24_iface *iface, char *buf, -+ off_t offset, size_t count) -+{ -+ struct at24_data *at24 = container_of(iface, struct at24_data, iface); -+ -+ return at24_eeprom_write(at24, buf, offset, count); -+} -+ -+/*-------------------------------------------------------------------------*/ -+ - static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) - { - struct at24_platform_data chip; -@@ -413,6 +431,9 @@ static int at24_probe(struct i2c_client - * is recommended anyhow. - */ - chip.page_size = 1; -+ -+ chip.setup = NULL; -+ chip.context = NULL; - } - - if (!is_power_of_2(chip.byte_len)) -@@ -449,6 +470,9 @@ static int at24_probe(struct i2c_client - goto err_out; - } - -+ at24->iface.read = at24_iface_read; -+ at24->iface.write = at24_iface_write; -+ - mutex_init(&at24->lock); - at24->use_smbus = use_smbus; - at24->chip = chip; -@@ -520,6 +544,10 @@ static int at24_probe(struct i2c_client - at24->write_max, - use_smbus ? ", use_smbus" : ""); - -+ /* export data to kernel code */ -+ if (chip.setup) -+ chip.setup(&at24->iface, chip.context); -+ - return 0; - - err_clients: ---- a/include/linux/i2c/at24.h -+++ b/include/linux/i2c/at24.h -@@ -15,6 +15,13 @@ - * is bigger than what the chip actually supports! - */ - -+struct at24_iface { -+ ssize_t (*read)(struct at24_iface *, char *buf, off_t offset, -+ size_t count); -+ ssize_t (*write)(struct at24_iface *, char *buf, off_t offset, -+ size_t count); -+}; -+ - struct at24_platform_data { - u32 byte_len; /* size (sum of all addr) */ - u16 page_size; /* for writes */ -@@ -23,6 +30,9 @@ struct at24_platform_data { - #define AT24_FLAG_READONLY 0x40 /* sysfs-entry will be read-only */ - #define AT24_FLAG_IRUGO 0x20 /* sysfs-entry will be world-readable */ - #define AT24_FLAG_TAKE8ADDR 0x10 /* take always 8 addresses (24c00) */ -+ -+ int (*setup)(struct at24_iface *, void *context); -+ void *context; - }; - - #endif /* _LINUX_AT24_H */ |