From: Wolfram Sang Date: Mon, 15 Jun 2009 16:01:49 +0000 (+0200) Subject: i2c/chips: Move max6875 to drivers/misc/eeprom X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4b364f230a5ef984818837ec7c2be0884eac191c;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git i2c/chips: Move max6875 to drivers/misc/eeprom This driver only reads the user EEPROM of that chip, so we can move it to the eeprom-directory in order to further clean up (and later remove) drivers/i2c/chips. The Kconfig text was updated to match the current functionality, dropping the meanwhile obsoleted parts. Defconfigs have been adapted. Signed-off-by: Wolfram Sang Acked-by: Ben Gardner Signed-off-by: Jean Delvare --- diff --git a/arch/mips/configs/bigsur_defconfig b/arch/mips/configs/bigsur_defconfig index 783da855a2e3..d6d35b2e5fe8 100644 --- a/arch/mips/configs/bigsur_defconfig +++ b/arch/mips/configs/bigsur_defconfig @@ -963,7 +963,7 @@ CONFIG_EEPROM_LEGACY=y CONFIG_SENSORS_PCF8574=y # CONFIG_PCF8575 is not set CONFIG_SENSORS_PCF8591=y -CONFIG_SENSORS_MAX6875=y +CONFIG_EEPROM_MAX6875=y # CONFIG_SENSORS_TSL2550 is not set CONFIG_I2C_DEBUG_CORE=y CONFIG_I2C_DEBUG_ALGO=y diff --git a/arch/mips/configs/mtx1_defconfig b/arch/mips/configs/mtx1_defconfig index 8426d3b9501c..fadb351d249b 100644 --- a/arch/mips/configs/mtx1_defconfig +++ b/arch/mips/configs/mtx1_defconfig @@ -1849,7 +1849,7 @@ CONFIG_EEPROM_LEGACY=m CONFIG_SENSORS_PCF8574=m CONFIG_SENSORS_PCA9539=m CONFIG_SENSORS_PCF8591=m -CONFIG_SENSORS_MAX6875=m +CONFIG_EEPROM_MAX6875=m # CONFIG_SENSORS_TSL2550 is not set # CONFIG_I2C_DEBUG_CORE is not set # CONFIG_I2C_DEBUG_ALGO is not set diff --git a/arch/powerpc/configs/ppc6xx_defconfig b/arch/powerpc/configs/ppc6xx_defconfig index 7d044dfd9236..12dc7c409616 100644 --- a/arch/powerpc/configs/ppc6xx_defconfig +++ b/arch/powerpc/configs/ppc6xx_defconfig @@ -1808,7 +1808,7 @@ CONFIG_PCF8575=m CONFIG_SENSORS_PCA9539=m CONFIG_SENSORS_PCF8591=m # CONFIG_TPS65010 is not set -CONFIG_SENSORS_MAX6875=m +CONFIG_EEPROM_MAX6875=m CONFIG_SENSORS_TSL2550=m CONFIG_MCU_MPC8349EMITX=m # CONFIG_I2C_DEBUG_CORE is not set diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 8f8c81eb0aee..02d746c9c474 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -64,21 +64,6 @@ config SENSORS_PCA9539 This driver is deprecated and will be dropped soon. Use drivers/gpio/pca953x.c instead. -config SENSORS_MAX6875 - tristate "Maxim MAX6875 Power supply supervisor" - depends on EXPERIMENTAL - help - If you say yes here you get support for the Maxim MAX6875 - EEPROM-programmable, quad power-supply sequencer/supervisor. - - This provides an interface to program the EEPROM and reset the chip. - - This driver also supports the Maxim MAX6874 hex power-supply - sequencer/supervisor if found at a compatible address. - - This driver can also be built as a module. If so, the module - will be called max6875. - config SENSORS_TSL2550 tristate "Taos TSL2550 ambient light sensor" depends on EXPERIMENTAL diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index 55a376037183..f4680d16ee34 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -11,7 +11,6 @@ # obj-$(CONFIG_DS1682) += ds1682.o -obj-$(CONFIG_SENSORS_MAX6875) += max6875.o obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_PCF8575) += pcf8575.o diff --git a/drivers/i2c/chips/max6875.c b/drivers/i2c/chips/max6875.c deleted file mode 100644 index 033d9d81ec8a..000000000000 --- a/drivers/i2c/chips/max6875.c +++ /dev/null @@ -1,246 +0,0 @@ -/* - max6875.c - driver for MAX6874/MAX6875 - - Copyright (C) 2005 Ben Gardner - - Based on i2c/chips/eeprom.c - - The MAX6875 has a bank of registers and two banks of EEPROM. - Address ranges are defined as follows: - * 0x0000 - 0x0046 = configuration registers - * 0x8000 - 0x8046 = configuration EEPROM - * 0x8100 - 0x82FF = user EEPROM - - This driver makes the user EEPROM available for read. - - The registers & config EEPROM should be accessed via i2c-dev. - - The MAX6875 ignores the lowest address bit, so each chip responds to - two addresses - 0x50/0x51 and 0x52/0x53. - - Note that the MAX6875 uses i2c_smbus_write_byte_data() to set the read - address, so this driver is destructive if loaded for the wrong EEPROM chip. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; version 2 of the License. -*/ - -#include -#include -#include -#include -#include -#include - -/* Do not scan - the MAX6875 access method will write to some EEPROM chips */ -static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_1(max6875); - -/* The MAX6875 can only read/write 16 bytes at a time */ -#define SLICE_SIZE 16 -#define SLICE_BITS 4 - -/* USER EEPROM is at addresses 0x8100 - 0x82FF */ -#define USER_EEPROM_BASE 0x8100 -#define USER_EEPROM_SIZE 0x0200 -#define USER_EEPROM_SLICES 32 - -/* MAX6875 commands */ -#define MAX6875_CMD_BLK_READ 0x84 - -/* Each client has this additional data */ -struct max6875_data { - struct i2c_client *fake_client; - struct mutex update_lock; - - u32 valid; - u8 data[USER_EEPROM_SIZE]; - unsigned long last_updated[USER_EEPROM_SLICES]; -}; - -static void max6875_update_slice(struct i2c_client *client, int slice) -{ - struct max6875_data *data = i2c_get_clientdata(client); - int i, j, addr; - u8 *buf; - - if (slice >= USER_EEPROM_SLICES) - return; - - mutex_lock(&data->update_lock); - - buf = &data->data[slice << SLICE_BITS]; - - if (!(data->valid & (1 << slice)) || - time_after(jiffies, data->last_updated[slice])) { - - dev_dbg(&client->dev, "Starting update of slice %u\n", slice); - - data->valid &= ~(1 << slice); - - addr = USER_EEPROM_BASE + (slice << SLICE_BITS); - - /* select the eeprom address */ - if (i2c_smbus_write_byte_data(client, addr >> 8, addr & 0xFF)) { - dev_err(&client->dev, "address set failed\n"); - goto exit_up; - } - - if (i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { - if (i2c_smbus_read_i2c_block_data(client, - MAX6875_CMD_BLK_READ, - SLICE_SIZE, - buf) != SLICE_SIZE) { - goto exit_up; - } - } else { - for (i = 0; i < SLICE_SIZE; i++) { - j = i2c_smbus_read_byte(client); - if (j < 0) { - goto exit_up; - } - buf[i] = j; - } - } - data->last_updated[slice] = jiffies; - data->valid |= (1 << slice); - } -exit_up: - mutex_unlock(&data->update_lock); -} - -static ssize_t max6875_read(struct kobject *kobj, - struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) -{ - struct i2c_client *client = kobj_to_i2c_client(kobj); - struct max6875_data *data = i2c_get_clientdata(client); - int slice, max_slice; - - if (off > USER_EEPROM_SIZE) - return 0; - - if (off + count > USER_EEPROM_SIZE) - count = USER_EEPROM_SIZE - off; - - /* refresh slices which contain requested bytes */ - max_slice = (off + count - 1) >> SLICE_BITS; - for (slice = (off >> SLICE_BITS); slice <= max_slice; slice++) - max6875_update_slice(client, slice); - - memcpy(buf, &data->data[off], count); - - return count; -} - -static struct bin_attribute user_eeprom_attr = { - .attr = { - .name = "eeprom", - .mode = S_IRUGO, - }, - .size = USER_EEPROM_SIZE, - .read = max6875_read, -}; - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int max6875_detect(struct i2c_client *client, int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA - | I2C_FUNC_SMBUS_READ_BYTE)) - return -ENODEV; - - /* Only check even addresses */ - if (client->addr & 1) - return -ENODEV; - - strlcpy(info->type, "max6875", I2C_NAME_SIZE); - - return 0; -} - -static int max6875_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct max6875_data *data; - int err; - - if (!(data = kzalloc(sizeof(struct max6875_data), GFP_KERNEL))) - return -ENOMEM; - - /* A fake client is created on the odd address */ - data->fake_client = i2c_new_dummy(client->adapter, client->addr + 1); - if (!data->fake_client) { - err = -ENOMEM; - goto exit_kfree; - } - - /* Init real i2c_client */ - i2c_set_clientdata(client, data); - mutex_init(&data->update_lock); - - err = sysfs_create_bin_file(&client->dev.kobj, &user_eeprom_attr); - if (err) - goto exit_remove_fake; - - return 0; - -exit_remove_fake: - i2c_unregister_device(data->fake_client); -exit_kfree: - kfree(data); - return err; -} - -static int max6875_remove(struct i2c_client *client) -{ - struct max6875_data *data = i2c_get_clientdata(client); - - i2c_unregister_device(data->fake_client); - - sysfs_remove_bin_file(&client->dev.kobj, &user_eeprom_attr); - kfree(data); - - return 0; -} - -static const struct i2c_device_id max6875_id[] = { - { "max6875", 0 }, - { } -}; - -static struct i2c_driver max6875_driver = { - .driver = { - .name = "max6875", - }, - .probe = max6875_probe, - .remove = max6875_remove, - .id_table = max6875_id, - - .detect = max6875_detect, - .address_data = &addr_data, -}; - -static int __init max6875_init(void) -{ - return i2c_add_driver(&max6875_driver); -} - -static void __exit max6875_exit(void) -{ - i2c_del_driver(&max6875_driver); -} - - -MODULE_AUTHOR("Ben Gardner "); -MODULE_DESCRIPTION("MAX6875 driver"); -MODULE_LICENSE("GPL"); - -module_init(max6875_init); -module_exit(max6875_exit); diff --git a/drivers/misc/eeprom/Kconfig b/drivers/misc/eeprom/Kconfig index 89fec052f3b4..9118613af321 100644 --- a/drivers/misc/eeprom/Kconfig +++ b/drivers/misc/eeprom/Kconfig @@ -48,6 +48,20 @@ config EEPROM_LEGACY This driver can also be built as a module. If so, the module will be called eeprom. +config EEPROM_MAX6875 + tristate "Maxim MAX6874/5 power supply supervisor" + depends on I2C && EXPERIMENTAL + help + If you say yes here you get read-only support for the user EEPROM of + the Maxim MAX6874/5 EEPROM-programmable, quad power-supply + sequencer/supervisor. + + All other features of this chip should be accessed via i2c-dev. + + This driver can also be built as a module. If so, the module + will be called max6875. + + config EEPROM_93CX6 tristate "EEPROM 93CX6 support" help diff --git a/drivers/misc/eeprom/Makefile b/drivers/misc/eeprom/Makefile index 539dd8f88128..df3d68ffa9d1 100644 --- a/drivers/misc/eeprom/Makefile +++ b/drivers/misc/eeprom/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_EEPROM_AT24) += at24.o obj-$(CONFIG_EEPROM_AT25) += at25.o obj-$(CONFIG_EEPROM_LEGACY) += eeprom.o +obj-$(CONFIG_EEPROM_MAX6875) += max6875.o obj-$(CONFIG_EEPROM_93CX6) += eeprom_93cx6.o diff --git a/drivers/misc/eeprom/max6875.c b/drivers/misc/eeprom/max6875.c new file mode 100644 index 000000000000..3c0c58eed347 --- /dev/null +++ b/drivers/misc/eeprom/max6875.c @@ -0,0 +1,246 @@ +/* + max6875.c - driver for MAX6874/MAX6875 + + Copyright (C) 2005 Ben Gardner + + Based on eeprom.c + + The MAX6875 has a bank of registers and two banks of EEPROM. + Address ranges are defined as follows: + * 0x0000 - 0x0046 = configuration registers + * 0x8000 - 0x8046 = configuration EEPROM + * 0x8100 - 0x82FF = user EEPROM + + This driver makes the user EEPROM available for read. + + The registers & config EEPROM should be accessed via i2c-dev. + + The MAX6875 ignores the lowest address bit, so each chip responds to + two addresses - 0x50/0x51 and 0x52/0x53. + + Note that the MAX6875 uses i2c_smbus_write_byte_data() to set the read + address, so this driver is destructive if loaded for the wrong EEPROM chip. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; version 2 of the License. +*/ + +#include +#include +#include +#include +#include +#include + +/* Do not scan - the MAX6875 access method will write to some EEPROM chips */ +static const unsigned short normal_i2c[] = { I2C_CLIENT_END }; + +/* Insmod parameters */ +I2C_CLIENT_INSMOD_1(max6875); + +/* The MAX6875 can only read/write 16 bytes at a time */ +#define SLICE_SIZE 16 +#define SLICE_BITS 4 + +/* USER EEPROM is at addresses 0x8100 - 0x82FF */ +#define USER_EEPROM_BASE 0x8100 +#define USER_EEPROM_SIZE 0x0200 +#define USER_EEPROM_SLICES 32 + +/* MAX6875 commands */ +#define MAX6875_CMD_BLK_READ 0x84 + +/* Each client has this additional data */ +struct max6875_data { + struct i2c_client *fake_client; + struct mutex update_lock; + + u32 valid; + u8 data[USER_EEPROM_SIZE]; + unsigned long last_updated[USER_EEPROM_SLICES]; +}; + +static void max6875_update_slice(struct i2c_client *client, int slice) +{ + struct max6875_data *data = i2c_get_clientdata(client); + int i, j, addr; + u8 *buf; + + if (slice >= USER_EEPROM_SLICES) + return; + + mutex_lock(&data->update_lock); + + buf = &data->data[slice << SLICE_BITS]; + + if (!(data->valid & (1 << slice)) || + time_after(jiffies, data->last_updated[slice])) { + + dev_dbg(&client->dev, "Starting update of slice %u\n", slice); + + data->valid &= ~(1 << slice); + + addr = USER_EEPROM_BASE + (slice << SLICE_BITS); + + /* select the eeprom address */ + if (i2c_smbus_write_byte_data(client, addr >> 8, addr & 0xFF)) { + dev_err(&client->dev, "address set failed\n"); + goto exit_up; + } + + if (i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { + if (i2c_smbus_read_i2c_block_data(client, + MAX6875_CMD_BLK_READ, + SLICE_SIZE, + buf) != SLICE_SIZE) { + goto exit_up; + } + } else { + for (i = 0; i < SLICE_SIZE; i++) { + j = i2c_smbus_read_byte(client); + if (j < 0) { + goto exit_up; + } + buf[i] = j; + } + } + data->last_updated[slice] = jiffies; + data->valid |= (1 << slice); + } +exit_up: + mutex_unlock(&data->update_lock); +} + +static ssize_t max6875_read(struct kobject *kobj, + struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) +{ + struct i2c_client *client = kobj_to_i2c_client(kobj); + struct max6875_data *data = i2c_get_clientdata(client); + int slice, max_slice; + + if (off > USER_EEPROM_SIZE) + return 0; + + if (off + count > USER_EEPROM_SIZE) + count = USER_EEPROM_SIZE - off; + + /* refresh slices which contain requested bytes */ + max_slice = (off + count - 1) >> SLICE_BITS; + for (slice = (off >> SLICE_BITS); slice <= max_slice; slice++) + max6875_update_slice(client, slice); + + memcpy(buf, &data->data[off], count); + + return count; +} + +static struct bin_attribute user_eeprom_attr = { + .attr = { + .name = "eeprom", + .mode = S_IRUGO, + }, + .size = USER_EEPROM_SIZE, + .read = max6875_read, +}; + +/* Return 0 if detection is successful, -ENODEV otherwise */ +static int max6875_detect(struct i2c_client *client, int kind, + struct i2c_board_info *info) +{ + struct i2c_adapter *adapter = client->adapter; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WRITE_BYTE_DATA + | I2C_FUNC_SMBUS_READ_BYTE)) + return -ENODEV; + + /* Only check even addresses */ + if (client->addr & 1) + return -ENODEV; + + strlcpy(info->type, "max6875", I2C_NAME_SIZE); + + return 0; +} + +static int max6875_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct max6875_data *data; + int err; + + if (!(data = kzalloc(sizeof(struct max6875_data), GFP_KERNEL))) + return -ENOMEM; + + /* A fake client is created on the odd address */ + data->fake_client = i2c_new_dummy(client->adapter, client->addr + 1); + if (!data->fake_client) { + err = -ENOMEM; + goto exit_kfree; + } + + /* Init real i2c_client */ + i2c_set_clientdata(client, data); + mutex_init(&data->update_lock); + + err = sysfs_create_bin_file(&client->dev.kobj, &user_eeprom_attr); + if (err) + goto exit_remove_fake; + + return 0; + +exit_remove_fake: + i2c_unregister_device(data->fake_client); +exit_kfree: + kfree(data); + return err; +} + +static int max6875_remove(struct i2c_client *client) +{ + struct max6875_data *data = i2c_get_clientdata(client); + + i2c_unregister_device(data->fake_client); + + sysfs_remove_bin_file(&client->dev.kobj, &user_eeprom_attr); + kfree(data); + + return 0; +} + +static const struct i2c_device_id max6875_id[] = { + { "max6875", 0 }, + { } +}; + +static struct i2c_driver max6875_driver = { + .driver = { + .name = "max6875", + }, + .probe = max6875_probe, + .remove = max6875_remove, + .id_table = max6875_id, + + .detect = max6875_detect, + .address_data = &addr_data, +}; + +static int __init max6875_init(void) +{ + return i2c_add_driver(&max6875_driver); +} + +static void __exit max6875_exit(void) +{ + i2c_del_driver(&max6875_driver); +} + + +MODULE_AUTHOR("Ben Gardner "); +MODULE_DESCRIPTION("MAX6875 driver"); +MODULE_LICENSE("GPL"); + +module_init(max6875_init); +module_exit(max6875_exit);