diff options
Diffstat (limited to 'drivers/i2c/chips')
| -rw-r--r-- | drivers/i2c/chips/Kconfig | 48 | ||||
| -rw-r--r-- | drivers/i2c/chips/Makefile | 3 | ||||
| -rw-r--r-- | drivers/i2c/chips/at24.c | 582 | ||||
| -rw-r--r-- | drivers/i2c/chips/eeprom.c | 257 | ||||
| -rw-r--r-- | drivers/i2c/chips/mcu_mpc8349emitx.c | 209 |
5 files changed, 0 insertions, 1099 deletions
diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig index 59c3d23f5bdc..c80312c1f382 100644 --- a/drivers/i2c/chips/Kconfig +++ b/drivers/i2c/chips/Kconfig @@ -16,43 +16,6 @@ config DS1682 This driver can also be built as a module. If so, the module will be called ds1682. -config AT24 - tristate "EEPROMs from most vendors" - depends on SYSFS && EXPERIMENTAL - help - Enable this driver to get read/write support to most I2C EEPROMs, - after you configure the driver to know about each EEPROM on - your target board. Use these generic chip names, instead of - vendor-specific ones like at24c64 or 24lc02: - - 24c00, 24c01, 24c02, spd (readonly 24c02), 24c04, 24c08, - 24c16, 24c32, 24c64, 24c128, 24c256, 24c512, 24c1024 - - Unless you like data loss puzzles, always be sure that any chip - you configure as a 24c32 (32 kbit) or larger is NOT really a - 24c16 (16 kbit) or smaller, and vice versa. Marking the chip - as read-only won't help recover from this. Also, if your chip - has any software write-protect mechanism you may want to review the - code to make sure this driver won't turn it on by accident. - - If you use this with an SMBus adapter instead of an I2C adapter, - full functionality is not available. Only smaller devices are - supported (24c16 and below, max 4 kByte). - - This driver can also be built as a module. If so, the module - will be called at24. - -config SENSORS_EEPROM - tristate "EEPROM reader" - depends on EXPERIMENTAL - help - If you say yes here you get read-only access to the EEPROM data - available on modern memory DIMMs and Sony Vaio laptops. Such - EEPROMs could theoretically be available on other devices as well. - - This driver can also be built as a module. If so, the module - will be called eeprom. - config SENSORS_PCF8574 tristate "Philips PCF8574 and PCF8574A (DEPRECATED)" depends on EXPERIMENTAL && GPIO_PCF857X = "n" @@ -139,15 +102,4 @@ config SENSORS_TSL2550 This driver can also be built as a module. If so, the module will be called tsl2550. -config MCU_MPC8349EMITX - tristate "MPC8349E-mITX MCU driver" - depends on I2C && PPC_83xx - select GENERIC_GPIO - select ARCH_REQUIRE_GPIOLIB - help - Say Y here to enable soft power-off functionality on the Freescale - boards with the MPC8349E-mITX-compatible MCU chips. This driver will - also register MCU GPIOs with the generic GPIO API, so you'll able - to use MCU pins as GPIOs. - endmenu diff --git a/drivers/i2c/chips/Makefile b/drivers/i2c/chips/Makefile index 83accaaf8164..d142f238a2de 100644 --- a/drivers/i2c/chips/Makefile +++ b/drivers/i2c/chips/Makefile @@ -11,15 +11,12 @@ # obj-$(CONFIG_DS1682) += ds1682.o -obj-$(CONFIG_AT24) += at24.o -obj-$(CONFIG_SENSORS_EEPROM) += eeprom.o obj-$(CONFIG_SENSORS_MAX6875) += max6875.o obj-$(CONFIG_SENSORS_PCA9539) += pca9539.o obj-$(CONFIG_SENSORS_PCF8574) += pcf8574.o obj-$(CONFIG_PCF8575) += pcf8575.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o obj-$(CONFIG_SENSORS_TSL2550) += tsl2550.o -obj-$(CONFIG_MCU_MPC8349EMITX) += mcu_mpc8349emitx.o ifeq ($(CONFIG_I2C_DEBUG_CHIP),y) EXTRA_CFLAGS += -DDEBUG diff --git a/drivers/i2c/chips/at24.c b/drivers/i2c/chips/at24.c deleted file mode 100644 index d4775528abc6..000000000000 --- a/drivers/i2c/chips/at24.c +++ /dev/null @@ -1,582 +0,0 @@ -/* - * at24.c - handle most I2C EEPROMs - * - * Copyright (C) 2005-2007 David Brownell - * Copyright (C) 2008 Wolfram Sang, Pengutronix - * - * 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; either version 2 of the License, or - * (at your option) any later version. - */ -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/delay.h> -#include <linux/mutex.h> -#include <linux/sysfs.h> -#include <linux/mod_devicetable.h> -#include <linux/log2.h> -#include <linux/bitops.h> -#include <linux/jiffies.h> -#include <linux/i2c.h> -#include <linux/i2c/at24.h> - -/* - * I2C EEPROMs from most vendors are inexpensive and mostly interchangeable. - * Differences between different vendor product lines (like Atmel AT24C or - * MicroChip 24LC, etc) won't much matter for typical read/write access. - * There are also I2C RAM chips, likewise interchangeable. One example - * would be the PCF8570, which acts like a 24c02 EEPROM (256 bytes). - * - * However, misconfiguration can lose data. "Set 16-bit memory address" - * to a part with 8-bit addressing will overwrite data. Writing with too - * big a page size also loses data. And it's not safe to assume that the - * conventional addresses 0x50..0x57 only hold eeproms; a PCF8563 RTC - * uses 0x51, for just one example. - * - * Accordingly, explicit board-specific configuration data should be used - * in almost all cases. (One partial exception is an SMBus used to access - * "SPD" data for DRAM sticks. Those only use 24c02 EEPROMs.) - * - * So this driver uses "new style" I2C driver binding, expecting to be - * told what devices exist. That may be in arch/X/mach-Y/board-Z.c or - * similar kernel-resident tables; or, configuration data coming from - * a bootloader. - * - * Other than binding model, current differences from "eeprom" driver are - * that this one handles write access and isn't restricted to 24c02 devices. - * It also handles larger devices (32 kbit and up) with two-byte addresses, - * which won't work on pure SMBus systems. - */ - -struct at24_data { - struct at24_platform_data chip; - bool use_smbus; - - /* - * Lock protects against activities from other Linux tasks, - * but not from changes by other I2C masters. - */ - struct mutex lock; - struct bin_attribute bin; - - u8 *writebuf; - unsigned write_max; - unsigned num_addresses; - - /* - * Some chips tie up multiple I2C addresses; dummy devices reserve - * them for us, and we'll use them with SMBus calls. - */ - struct i2c_client *client[]; -}; - -/* - * This parameter is to help this driver avoid blocking other drivers out - * of I2C for potentially troublesome amounts of time. With a 100 kHz I2C - * clock, one 256 byte read takes about 1/43 second which is excessive; - * but the 1/170 second it takes at 400 kHz may be quite reasonable; and - * at 1 MHz (Fm+) a 1/430 second delay could easily be invisible. - * - * This value is forced to be a power of two so that writes align on pages. - */ -static unsigned io_limit = 128; -module_param(io_limit, uint, 0); -MODULE_PARM_DESC(io_limit, "Maximum bytes per I/O (default 128)"); - -/* - * Specs often allow 5 msec for a page write, sometimes 20 msec; - * it's important to recover from write timeouts. - */ -static unsigned write_timeout = 25; -module_param(write_timeout, uint, 0); -MODULE_PARM_DESC(write_timeout, "Time (in ms) to try writes (default 25)"); - -#define AT24_SIZE_BYTELEN 5 -#define AT24_SIZE_FLAGS 8 - -#define AT24_BITMASK(x) (BIT(x) - 1) - -/* create non-zero magic value for given eeprom parameters */ -#define AT24_DEVICE_MAGIC(_len, _flags) \ - ((1 << AT24_SIZE_FLAGS | (_flags)) \ - << AT24_SIZE_BYTELEN | ilog2(_len)) - -static const struct i2c_device_id at24_ids[] = { - /* needs 8 addresses as A0-A2 are ignored */ - { "24c00", AT24_DEVICE_MAGIC(128 / 8, AT24_FLAG_TAKE8ADDR) }, - /* old variants can't be handled with this generic entry! */ - { "24c01", AT24_DEVICE_MAGIC(1024 / 8, 0) }, - { "24c02", AT24_DEVICE_MAGIC(2048 / 8, 0) }, - /* spd is a 24c02 in memory DIMMs */ - { "spd", AT24_DEVICE_MAGIC(2048 / 8, - AT24_FLAG_READONLY | AT24_FLAG_IRUGO) }, - { "24c04", AT24_DEVICE_MAGIC(4096 / 8, 0) }, - /* 24rf08 quirk is handled at i2c-core */ - { "24c08", AT24_DEVICE_MAGIC(8192 / 8, 0) }, - { "24c16", AT24_DEVICE_MAGIC(16384 / 8, 0) }, - { "24c32", AT24_DEVICE_MAGIC(32768 / 8, AT24_FLAG_ADDR16) }, - { "24c64", AT24_DEVICE_MAGIC(65536 / 8, AT24_FLAG_ADDR16) }, - { "24c128", AT24_DEVICE_MAGIC(131072 / 8, AT24_FLAG_ADDR16) }, - { "24c256", AT24_DEVICE_MAGIC(262144 / 8, AT24_FLAG_ADDR16) }, - { "24c512", AT24_DEVICE_MAGIC(524288 / 8, AT24_FLAG_ADDR16) }, - { "24c1024", AT24_DEVICE_MAGIC(1048576 / 8, AT24_FLAG_ADDR16) }, - { "at24", 0 }, - { /* END OF LIST */ } -}; -MODULE_DEVICE_TABLE(i2c, at24_ids); - -/*-------------------------------------------------------------------------*/ - -/* - * This routine supports chips which consume multiple I2C addresses. It - * computes the addressing information to be used for a given r/w request. - * Assumes that sanity checks for offset happened at sysfs-layer. - */ -static struct i2c_client *at24_translate_offset(struct at24_data *at24, - unsigned *offset) -{ - unsigned i; - - if (at24->chip.flags & AT24_FLAG_ADDR16) { - i = *offset >> 16; - *offset &= 0xffff; - } else { - i = *offset >> 8; - *offset &= 0xff; - } - - return at24->client[i]; -} - -static ssize_t at24_eeprom_read(struct at24_data *at24, char *buf, - unsigned offset, size_t count) -{ - struct i2c_msg msg[2]; - u8 msgbuf[2]; - struct i2c_client *client; - int status, i; - - memset(msg, 0, sizeof(msg)); - - /* - * REVISIT some multi-address chips don't rollover page reads to - * the next slave address, so we may need to truncate the count. - * Those chips might need another quirk flag. - * - * If the real hardware used four adjacent 24c02 chips and that - * were misconfigured as one 24c08, that would be a similar effect: - * one "eeprom" file not four, but larger reads would fail when - * they crossed certain pages. - */ - - /* - * Slave address and byte offset derive from the offset. Always - * set the byte address; on a multi-master board, another master - * may have changed the chip's "current" address pointer. - */ - client = at24_translate_offset(at24, &offset); - - if (count > io_limit) - count = io_limit; - - /* Smaller eeproms can work given some SMBus extension calls */ - if (at24->use_smbus) { - if (count > I2C_SMBUS_BLOCK_MAX) - count = I2C_SMBUS_BLOCK_MAX; - status = i2c_smbus_read_i2c_block_data(client, offset, - count, buf); - dev_dbg(&client->dev, "smbus read %zu@%d --> %d\n", - count, offset, status); - return (status < 0) ? -EIO : status; - } - - /* - * When we have a better choice than SMBus calls, use a combined - * I2C message. Write address; then read up to io_limit data bytes. - * Note that read page rollover helps us here (unlike writes). - * msgbuf is u8 and will cast to our needs. - */ - i = 0; - if (at24->chip.flags & AT24_FLAG_ADDR16) - msgbuf[i++] = offset >> 8; - msgbuf[i++] = offset; - - msg[0].addr = client->addr; - msg[0].buf = msgbuf; - msg[0].len = i; - - msg[1].addr = client->addr; - msg[1].flags = I2C_M_RD; - msg[1].buf = buf; - msg[1].len = count; - - status = i2c_transfer(client->adapter, msg, 2); - dev_dbg(&client->dev, "i2c read %zu@%d --> %d\n", - count, offset, status); - - if (status == 2) - return count; - else if (status >= 0) - return -EIO; - else - return status; -} - -static ssize_t at24_bin_read(struct kobject *kobj, struct bin_attribute *attr, - char *buf, loff_t off, size_t count) -{ - struct at24_data *at24; - ssize_t retval = 0; - - at24 = dev_get_drvdata(container_of(kobj, struct device, kobj)); - - if (unlikely(!count)) - return count; - - /* - * Read data from chip, protecting against concurrent updates - * from this host, but not from other I2C masters. - */ - mutex_lock(&at24->lock); - - while (count) { - ssize_t status; - - status = at24_eeprom_read(at24, buf, off, count); - if (status <= 0) { - if (retval == 0) - retval = status; - break; - } - buf += status; - off += status; - count -= status; - retval += status; - } - - mutex_unlock(&at24->lock); - - return retval; -} - - -/* - * 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. - * - * We only use page mode writes; the alternative is sloooow. This routine - * writes at most one page. - */ -static ssize_t at24_eeprom_write(struct at24_data *at24, char *buf, - unsigned offset, size_t count) -{ - struct i2c_client *client; - struct i2c_msg msg; - ssize_t status; - unsigned long timeout, write_time; - unsigned next_page; - - /* Get corresponding I2C address and adjust offset */ - client = at24_translate_offset(at24, &offset); - - /* write_max is at most a page */ - if (count > at24->write_max) - count = at24->write_max; - - /* Never roll over backwards, to the start of this page */ - next_page = roundup(offset + 1, at24->chip.page_size); - if (offset + count > next_page) - count = next_page - offset; - - /* If we'll use I2C calls for I/O, set up the message */ - if (!at24->use_smbus) { - int i = 0; - - msg.addr = client->addr; - msg.flags = 0; - - /* msg.buf is u8 and casts will mask the values */ - msg.buf = at24->writebuf; - if (at24->chip.flags & AT24_FLAG_ADDR16) - msg.buf[i++] = offset >> 8; - - msg.buf[i++] = offset; - memcpy(&msg.buf[i], buf, count); - msg.len = i + count; - } - - /* - * Writes fail if the previous one didn't complete yet. We may - * loop a few times until this one succeeds, waiting at least - * long enough for one entire page write to work. - */ - timeout = jiffies + msecs_to_jiffies(write_timeout); - do { - write_time = jiffies; - if (at24->use_smbus) { - status = i2c_smbus_write_i2c_block_data(client, - offset, count, buf); - if (status == 0) - status = count; - } else { - status = i2c_transfer(client->adapter, &msg, 1); - if (status == 1) - status = count; - } - dev_dbg(&client->dev, "write %zu@%d --> %zd (%ld)\n", - count, offset, status, jiffies); - - if (status == count) - return count; - - /* REVISIT: at HZ=100, this is sloooow */ - msleep(1); - } while (time_before(write_time, timeout)); - - return -ETIMEDOUT; -} - -static ssize_t at24_bin_write(struct kobject *kobj, struct bin_attribute *attr, - char *buf, loff_t off, size_t count) -{ - struct at24_data *at24; - ssize_t retval = 0; - - at24 = dev_get_drvdata(container_of(kobj, struct device, kobj)); - - if (unlikely(!count)) - return count; - - /* - * Write data to chip, protecting against concurrent updates - * from this host, but not from other I2C masters. - */ - mutex_lock(&at24->lock); - - while (count) { - ssize_t status; - - status = at24_eeprom_write(at24, buf, off, count); - if (status <= 0) { - if (retval == 0) - retval = status; - break; - } - buf += status; - off += status; - count -= status; - retval += status; - } - - mutex_unlock(&at24->lock); - - return retval; -} - -/*-------------------------------------------------------------------------*/ - -static int at24_probe(struct i2c_client *client, const struct i2c_device_id *id) -{ - struct at24_platform_data chip; - bool writable; - bool use_smbus = false; - struct at24_data *at24; - int err; - unsigned i, num_addresses; - kernel_ulong_t magic; - - if (client->dev.platform_data) { - chip = *(struct at24_platform_data *)client->dev.platform_data; - } else { - if (!id->driver_data) { - err = -ENODEV; - goto err_out; - } - magic = id->driver_data; - chip.byte_len = BIT(magic & AT24_BITMASK(AT24_SIZE_BYTELEN)); - magic >>= AT24_SIZE_BYTELEN; - chip.flags = magic & AT24_BITMASK(AT24_SIZE_FLAGS); - /* - * 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; - } - - if (!is_power_of_2(chip.byte_len)) - dev_warn(&client->dev, - "byte_len looks suspicious (no power of 2)!\n"); - if (!is_power_of_2(chip.page_size)) - dev_warn(&client->dev, - "page_size looks suspicious (no power of 2)!\n"); - - /* Use I2C operations unless we're stuck with SMBus extensions. */ - if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { - if (chip.flags & AT24_FLAG_ADDR16) { - err = -EPFNOSUPPORT; - goto err_out; - } - if (!i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { - err = -EPFNOSUPPORT; - goto err_out; - } - use_smbus = true; - } - - if (chip.flags & AT24_FLAG_TAKE8ADDR) - num_addresses = 8; - else - num_addresses = DIV_ROUND_UP(chip.byte_len, - (chip.flags & AT24_FLAG_ADDR16) ? 65536 : 256); - - at24 = kzalloc(sizeof(struct at24_data) + - num_addresses * sizeof(struct i2c_client *), GFP_KERNEL); - if (!at24) { - err = -ENOMEM; - goto err_out; - } - - mutex_init(&at24->lock); - at24->use_smbus = use_smbus; - at24->chip = chip; - at24->num_addresses = num_addresses; - - /* - * Export the EEPROM bytes through sysfs, since that's convenient. - * By default, only root should see the data (maybe passwords etc) - */ - at24->bin.attr.name = "eeprom"; - at24->bin.attr.mode = chip.flags & AT24_FLAG_IRUGO ? S_IRUGO : S_IRUSR; - at24->bin.read = at24_bin_read; - at24->bin.size = chip.byte_len; - - writable = !(chip.flags & AT24_FLAG_READONLY); - if (writable) { - if (!use_smbus || i2c_check_functionality(client->adapter, - I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) { - - unsigned write_max = chip.page_size; - - at24->bin.write = at24_bin_write; - at24->bin.attr.mode |= S_IWUSR; - - if (write_max > io_limit) - write_max = io_limit; - if (use_smbus && write_max > I2C_SMBUS_BLOCK_MAX) - write_max = I2C_SMBUS_BLOCK_MAX; - at24->write_max = write_max; - - /* buffer (data + address at the beginning) */ - at24->writebuf = kmalloc(write_max + 2, GFP_KERNEL); - if (!at24->writebuf) { - err = -ENOMEM; - goto err_struct; - } - } else { - dev_warn(&client->dev, - "cannot write due to controller restrictions."); - } - } - - at24->client[0] = client; - - /* use dummy devices for multiple-address chips */ - for (i = 1; i < num_addresses; i++) { - at24->client[i] = i2c_new_dummy(client->adapter, - client->addr + i); - if (!at24->client[i]) { - dev_err(&client->dev, "address 0x%02x unavailable\n", - client->addr + i); - err = -EADDRINUSE; - goto err_clients; - } - } - - err = sysfs_create_bin_file(&client->dev.kobj, &at24->bin); - if (err) - goto err_clients; - - i2c_set_clientdata(client, at24); - - dev_info(&client->dev, "%zu byte %s EEPROM %s\n", - at24->bin.size, client->name, - writable ? "(writable)" : "(read-only)"); - dev_dbg(&client->dev, - "page_size %d, num_addresses %d, write_max %d%s\n", - chip.page_size, num_addresses, - at24->write_max, - use_smbus ? ", use_smbus" : ""); - - return 0; - -err_clients: - for (i = 1; i < num_addresses; i++) - if (at24->client[i]) - i2c_unregister_device(at24->client[i]); - - kfree(at24->writebuf); -err_struct: - kfree(at24); -err_out: - dev_dbg(&client->dev, "probe error %d\n", err); - return err; -} - -static int __devexit at24_remove(struct i2c_client *client) -{ - struct at24_data *at24; - int i; - - at24 = i2c_get_clientdata(client); - sysfs_remove_bin_file(&client->dev.kobj, &at24->bin); - - for (i = 1; i < at24->num_addresses; i++) - i2c_unregister_device(at24->client[i]); - - kfree(at24->writebuf); - kfree(at24); - i2c_set_clientdata(client, NULL); - return 0; -} - -/*-------------------------------------------------------------------------*/ - -static struct i2c_driver at24_driver = { - .driver = { - .name = "at24", - .owner = THIS_MODULE, - }, - .probe = at24_probe, - .remove = __devexit_p(at24_remove), - .id_table = at24_ids, -}; - -static int __init at24_init(void) -{ - io_limit = rounddown_pow_of_two(io_limit); - return i2c_add_driver(&at24_driver); -} -module_init(at24_init); - -static void __exit at24_exit(void) -{ - i2c_del_driver(&at24_driver); -} -module_exit(at24_exit); - -MODULE_DESCRIPTION("Driver for most I2C EEPROMs"); -MODULE_AUTHOR("David Brownell and Wolfram Sang"); -MODULE_LICENSE("GPL"); diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c deleted file mode 100644 index 2c27193aeaa0..000000000000 --- a/drivers/i2c/chips/eeprom.c +++ /dev/null @@ -1,257 +0,0 @@ -/* - Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and - Philip Edelbrock <phil@netroedge.com> - Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> - Copyright (C) 2003 IBM Corp. - Copyright (C) 2004 Jean Delvare <khali@linux-fr.org> - - 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; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. -*/ - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/jiffies.h> -#include <linux/i2c.h> -#include <linux/mutex.h> - -/* Addresses to scan */ -static const unsigned short normal_i2c[] = { 0x50, 0x51, 0x52, 0x53, 0x54, - 0x55, 0x56, 0x57, I2C_CLIENT_END }; - -/* Insmod parameters */ -I2C_CLIENT_INSMOD_1(eeprom); - - -/* Size of EEPROM in bytes */ -#define EEPROM_SIZE 256 - -/* possible types of eeprom devices */ -enum eeprom_nature { - UNKNOWN, - VAIO, -}; - -/* Each client has this additional data */ -struct eeprom_data { - struct mutex update_lock; - u8 valid; /* bitfield, bit!=0 if slice is valid */ - unsigned long last_updated[8]; /* In jiffies, 8 slices */ - u8 data[EEPROM_SIZE]; /* Register values */ - enum eeprom_nature nature; -}; - - -static void eeprom_update_client(struct i2c_client *client, u8 slice) -{ - struct eeprom_data *data = i2c_get_clientdata(client); - int i; - - mutex_lock(&data->update_lock); - - if (!(data->valid & (1 << slice)) || - time_after(jiffies, data->last_updated[slice] + 300 * HZ)) { - dev_dbg(&client->dev, "Starting eeprom update, slice %u\n", slice); - - if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) { - for (i = slice << 5; i < (slice + 1) << 5; i += 32) - if (i2c_smbus_read_i2c_block_data(client, i, - 32, data->data + i) - != 32) - goto exit; - } else { - for (i = slice << 5; i < (slice + 1) << 5; i += 2) { - int word = i2c_smbus_read_word_data(client, i); - if (word < 0) - goto exit; - data->data[i] = word & 0xff; - data->data[i + 1] = word >> 8; - } - } - data->last_updated[slice] = jiffies; - data->valid |= (1 << slice); - } -exit: - mutex_unlock(&data->update_lock); -} - -static ssize_t eeprom_read(struct kobject *kobj, struct bin_attribute *bin_attr, - char *buf, loff_t off, size_t count) -{ - struct i2c_client *client = to_i2c_client(container_of(kobj, struct device, kobj)); - struct eeprom_data *data = i2c_get_clientdata(client); - u8 slice; - - if (off > EEPROM_SIZE) - return 0; - if (off + count > EEPROM_SIZE) - count = EEPROM_SIZE - off; - - /* Only refresh slices which contain requested bytes */ - for (slice = off >> 5; slice <= (off + count - 1) >> 5; slice++) - eeprom_update_client(client, slice); - - /* Hide Vaio private settings to regular users: - - BIOS passwords: bytes 0x00 to 0x0f - - UUID: bytes 0x10 to 0x1f - - Serial number: 0xc0 to 0xdf */ - if (data->nature == VAIO && !capable(CAP_SYS_ADMIN)) { - int i; - - for (i = 0; i < count; i++) { - if ((off + i <= 0x1f) || - (off + i >= 0xc0 && off + i <= 0xdf)) - buf[i] = 0; - else - buf[i] = data->data[off + i]; - } - } else { - memcpy(buf, &data->data[off], count); - } - - return count; -} - -static struct bin_attribute eeprom_attr = { - .attr = { - .name = "eeprom", - .mode = S_IRUGO, - }, - .size = EEPROM_SIZE, - .read = eeprom_read, -}; - -/* Return 0 if detection is successful, -ENODEV otherwise */ -static int eeprom_detect(struct i2c_client *client, int kind, - struct i2c_board_info *info) -{ - struct i2c_adapter *adapter = client->adapter; - - /* EDID EEPROMs are often 24C00 EEPROMs, which answer to all - addresses 0x50-0x57, but we only care about 0x50. So decline - attaching to addresses >= 0x51 on DDC buses */ - if (!(adapter->class & I2C_CLASS_SPD) && client->addr >= 0x51) - return -ENODEV; - - /* There are four ways we can read the EEPROM data: - (1) I2C block reads (faster, but unsupported by most adapters) - (2) Word reads (128% overhead) - (3) Consecutive byte reads (88% overhead, unsafe) - (4) Regular byte data reads (265% overhead) - The third and fourth methods are not implemented by this driver - because all known adapters support one of the first two. */ - if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_WORD_DATA) - && !i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) - return -ENODEV; - - strlcpy(info->type, "eeprom", I2C_NAME_SIZE); - - return 0; -} - -static int eeprom_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct i2c_adapter *adapter = client->adapter; - struct eeprom_data *data; - int err; - - if (!(data = kzalloc(sizeof(struct eeprom_data), GFP_KERNEL))) { - err = -ENOMEM; - goto exit; - } - - memset(data->data, 0xff, EEPROM_SIZE); - i2c_set_clientdata(client, data); - mutex_init(&data->update_lock); - data->nature = UNKNOWN; - - /* Detect the Vaio nature of EEPROMs. - We use the "PCG-" or "VGN-" prefix as the signature. */ - if (client->addr == 0x57 - && i2c_check_functionality(adapter, I2C_FUNC_SMBUS_READ_BYTE_DATA)) { - char name[4]; - - name[0] = i2c_smbus_read_byte_data(client, 0x80); - name[1] = i2c_smbus_read_byte_data(client, 0x81); - name[2] = i2c_smbus_read_byte_data(client, 0x82); - name[3] = i2c_smbus_read_byte_data(client, 0x83); - - if (!memcmp(name, "PCG-", 4) || !memcmp(name, "VGN-", 4)) { - dev_info(&client->dev, "Vaio EEPROM detected, " - "enabling privacy protection\n"); - data->nature = VAIO; - } - } - - /* create the sysfs eeprom file */ - err = sysfs_create_bin_file(&client->dev.kobj, &eeprom_attr); - if (err) - goto exit_kfree; - - return 0; - -exit_kfree: - kfree(data); -exit: - return err; -} - -static int eeprom_remove(struct i2c_client *client) -{ - sysfs_remove_bin_file(&client->dev.kobj, &eeprom_attr); - kfree(i2c_get_clientdata(client)); - - return 0; -} - -static const struct i2c_device_id eeprom_id[] = { - { "eeprom", 0 }, - { } -}; - -static struct i2c_driver eeprom_driver = { - .driver = { - .name = "eeprom", - }, - .probe = eeprom_probe, - .remove = eeprom_remove, - .id_table = eeprom_id, - - .class = I2C_CLASS_DDC | I2C_CLASS_SPD, - .detect = eeprom_detect, - .address_data = &addr_data, -}; - -static int __init eeprom_init(void) -{ - return i2c_add_driver(&eeprom_driver); -} - -static void __exit eeprom_exit(void) -{ - i2c_del_driver(&eeprom_driver); -} - - -MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and " - "Philip Edelbrock <phil@netroedge.com> and " - "Greg Kroah-Hartman <greg@kroah.com>"); -MODULE_DESCRIPTION("I2C EEPROM driver"); -MODULE_LICENSE("GPL"); - -module_init(eeprom_init); -module_exit(eeprom_exit); diff --git a/drivers/i2c/chips/mcu_mpc8349emitx.c b/drivers/i2c/chips/mcu_mpc8349emitx.c deleted file mode 100644 index 82a9bcb858b6..000000000000 --- a/drivers/i2c/chips/mcu_mpc8349emitx.c +++ /dev/null @@ -1,209 +0,0 @@ -/* - * Power Management and GPIO expander driver for MPC8349E-mITX-compatible MCU - * - * Copyright (c) 2008 MontaVista Software, Inc. - * - * Author: Anton Vorontsov <avorontsov@ru.mvista.com> - * - * 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; either version 2 of the License, or - * (at your option) any later version. - */ - -#include <linux/init.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/mutex.h> -#include <linux/i2c.h> -#include <linux/gpio.h> -#include <linux/of.h> -#include <linux/of_gpio.h> -#include <asm/prom.h> -#include <asm/machdep.h> - -/* - * I don't have specifications for the MCU firmware, I found this register - * and bits positions by the trial&error method. - */ -#define MCU_REG_CTRL 0x20 -#define MCU_CTRL_POFF 0x40 - -#define MCU_NUM_GPIO 2 - -struct mcu { - struct mutex lock; - struct device_node *np; - struct i2c_client *client; - struct of_gpio_chip of_gc; - u8 reg_ctrl; -}; - -static struct mcu *glob_mcu; - -static void mcu_power_off(void) -{ - struct mcu *mcu = glob_mcu; - - pr_info("Sending power-off request to the MCU...\n"); - mutex_lock(&mcu->lock); - i2c_smbus_write_byte_data(glob_mcu->client, MCU_REG_CTRL, - mcu->reg_ctrl | MCU_CTRL_POFF); - mutex_unlock(&mcu->lock); -} - -static void mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val) -{ - struct of_gpio_chip *of_gc = to_of_gpio_chip(gc); - struct mcu *mcu = container_of(of_gc, struct mcu, of_gc); - u8 bit = 1 << (4 + gpio); - - mutex_lock(&mcu->lock); - if (val) - mcu->reg_ctrl &= ~bit; - else - mcu->reg_ctrl |= bit; - - i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, mcu->reg_ctrl); - mutex_unlock(&mcu->lock); -} - -static int mcu_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) -{ - mcu_gpio_set(gc, gpio, val); - return 0; -} - -static int mcu_gpiochip_add(struct mcu *mcu) -{ - struct device_node *np; - struct of_gpio_chip *of_gc = &mcu->of_gc; - struct gpio_chip *gc = &of_gc->gc; - int ret; - - np = of_find_compatible_node(NULL, NULL, "fsl,mcu-mpc8349emitx"); - if (!np) - return -ENODEV; - - gc->owner = THIS_MODULE; - gc->label = np->full_name; - gc->can_sleep = 1; - gc->ngpio = MCU_NUM_GPIO; - gc->base = -1; - gc->set = mcu_gpio_set; - gc->direction_output = mcu_gpio_dir_out; - of_gc->gpio_cells = 2; - of_gc->xlate = of_gpio_simple_xlate; - - np->data = of_gc; - mcu->np = np; - - /* - * We don't want to lose the node, its ->data and ->full_name... - * So, if succeeded, we don't put the node here. - */ - ret = gpiochip_add(gc); - if (ret) - of_node_put(np); - return ret; -} - -static int mcu_gpiochip_remove(struct mcu *mcu) -{ - int ret; - - ret = gpiochip_remove(&mcu->of_gc.gc); - if (ret) - return ret; - of_node_put(mcu->np); - - return 0; -} - -static int __devinit mcu_probe(struct i2c_client *client, - const struct i2c_device_id *id) -{ - struct mcu *mcu; - int ret; - - mcu = kzalloc(sizeof(*mcu), GFP_KERNEL); - if (!mcu) - return -ENOMEM; - - mutex_init(&mcu->lock); - mcu->client = client; - i2c_set_clientdata(client, mcu); - - ret = i2c_smbus_read_byte_data(mcu->client, MCU_REG_CTRL); - if (ret < 0) - goto err; - mcu->reg_ctrl = ret; - - ret = mcu_gpiochip_add(mcu); - if (ret) - goto err; - - /* XXX: this is potentially racy, but there is no lock for ppc_md */ - if (!ppc_md.power_off) { - glob_mcu = mcu; - ppc_md.power_off = mcu_power_off; - dev_info(&client->dev, "will provide power-off service\n"); - } - - return 0; -err: - kfree(mcu); - return ret; -} - -static int __devexit mcu_remove(struct i2c_client *client) -{ - struct mcu *mcu = i2c_get_clientdata(client); - int ret; - - if (glob_mcu == mcu) { - ppc_md.power_off = NULL; - glob_mcu = NULL; - } - - ret = mcu_gpiochip_remove(mcu); - if (ret) - return ret; - i2c_set_clientdata(client, NULL); - kfree(mcu); - return 0; -} - -static const struct i2c_device_id mcu_ids[] = { - { "mcu-mpc8349emitx", }, - {}, -}; -MODULE_DEVICE_TABLE(i2c, mcu_ids); - -static struct i2c_driver mcu_driver = { - .driver = { - .name = "mcu-mpc8349emitx", - .owner = THIS_MODULE, - }, - .probe = mcu_probe, - .remove = __devexit_p(mcu_remove), - .id_table = mcu_ids, -}; - -static int __init mcu_init(void) -{ - return i2c_add_driver(&mcu_driver); -} -module_init(mcu_init); - -static void __exit mcu_exit(void) -{ - i2c_del_driver(&mcu_driver); -} -module_exit(mcu_exit); - -MODULE_DESCRIPTION("Power Management and GPIO expander driver for " - "MPC8349E-mITX-compatible MCU"); -MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>"); -MODULE_LICENSE("GPL"); |