Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751537Ab1FNEPG (ORCPT ); Tue, 14 Jun 2011 00:15:06 -0400 Received: from mail4.aviatnet.com ([192.147.115.31]:14205 "EHLO mail4.aviatnet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750843Ab1FNEPE (ORCPT ); Tue, 14 Jun 2011 00:15:04 -0400 Subject: Re: [PATCH 2.6.39-rc7] RTC: rtc-ds1307 EEPROM support for ds1388 chip From: Austin Boyle To: Alessandro Zummo CC: , In-Reply-To: <1306127917.3071.32.camel@pc786-ubu.gnet.global.vpn> References: <1306127917.3071.32.camel@pc786-ubu.gnet.global.vpn> Content-Type: text/plain; charset="UTF-8" Date: Tue, 14 Jun 2011 16:14:57 +1200 Message-ID: <1308024897.2992.39.camel@pc786-ubu.gnet.global.vpn> MIME-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit X-Originating-IP: [10.16.1.145] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9984 Lines: 322 On Mon, 2011-05-23 at 17:18 +1200, Austin Boyle wrote: > This is my patch which extends the NVRAM access functions in the DS1307 > driver to support the 512 bytes of EEPROM on the DS1388 chip. Could you > please review the patch? If there are any problems with the way I have > implemented this or suggested improvements I will gladly modify. Thanks! This is an updated version of the patch which prints the correct NVRAM size at init. Could someone please give me some feedback? [PATCH 3.0-rc3] RTC: rtc-ds1307: EEPROM support for ds1388 chip This patch adds support for different sized NVRAM, such as the 512 bytes of EEPROM on the DS1388 chip. Cc: Alessandro Zummo Signed-off-by: Austin Boyle --- diff -upNr a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c --- a/drivers/rtc/rtc-ds1307.c 2011-06-14 15:56:45.221497487 +1200 +++ b/drivers/rtc/rtc-ds1307.c 2011-06-14 15:57:28.803510835 +1200 @@ -95,15 +95,19 @@ enum ds_type { # define RX8025_BIT_VDET 0x40 # define RX8025_BIT_XST 0x20 +#define DS1307_MAX_NUM_ADDRS 3 struct ds1307 { u8 offset; /* register's offset */ + u16 nvram_size; + u16 nvram_offset; + u8 num_addrs; u8 regs[11]; enum ds_type type; unsigned long flags; #define HAS_NVRAM 0 /* bit 0 == sysfs file active */ #define HAS_ALARM 1 /* bit 1 == irq claimed */ - struct i2c_client *client; + struct i2c_client *client[DS1307_MAX_NUM_ADDRS]; struct rtc_device *rtc; struct work_struct work; s32 (*read_block_data)(const struct i2c_client *client, u8 command, @@ -113,23 +117,26 @@ struct ds1307 { }; struct chip_desc { - unsigned nvram56:1; + unsigned nvram:1; unsigned alarm:1; }; static const struct chip_desc chips[] = { [ds_1307] = { - .nvram56 = 1, + .nvram = 1, }, [ds_1337] = { .alarm = 1, }, [ds_1338] = { - .nvram56 = 1, + .nvram = 1, }, [ds_1339] = { .alarm = 1, }, +[ds_1388] = { + .nvram = 1, +}, [ds_1340] = { }, [ds_3231] = { @@ -248,7 +255,7 @@ static void ds1307_work(struct work_stru int stat, control; ds1307 = container_of(work, struct ds1307, work); - client = ds1307->client; + client = ds1307->client[0]; lock = &ds1307->rtc->ops_lock; mutex_lock(lock); @@ -294,7 +301,7 @@ static int ds1307_get_time(struct device int tmp; /* read the RTC date and time registers all at once */ - tmp = ds1307->read_block_data(ds1307->client, + tmp = ds1307->read_block_data(ds1307->client[0], ds1307->offset, 7, ds1307->regs); if (tmp != 7) { dev_err(dev, "%s error %d\n", "read", tmp); @@ -372,7 +379,7 @@ static int ds1307_set_time(struct device "write", buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6]); - result = ds1307->write_block_data(ds1307->client, + result = ds1307->write_block_data(ds1307->client[0], ds1307->offset, 7, buf); if (result < 0) { dev_err(dev, "%s error %d\n", "write", result); @@ -530,8 +537,6 @@ static const struct rtc_class_ops ds13xx /*----------------------------------------------------------------------*/ -#define NVRAM_SIZE 56 - static ssize_t ds1307_nvram_read(struct file *filp, struct kobject *kobj, struct bin_attribute *attr, @@ -540,18 +545,39 @@ ds1307_nvram_read(struct file *filp, str struct i2c_client *client; struct ds1307 *ds1307; int result; + unsigned int addr = 0; client = kobj_to_i2c_client(kobj); ds1307 = i2c_get_clientdata(client); - if (unlikely(off >= NVRAM_SIZE)) + if (unlikely(off >= ds1307->nvram_size)) return 0; - if ((off + count) > NVRAM_SIZE) - count = NVRAM_SIZE - off; + if ((off + count) > ds1307->nvram_size) + count = ds1307->nvram_size - off; if (unlikely(!count)) return count; - result = ds1307->read_block_data(client, 8 + off, count, buf); + if (ds1307->nvram_offset < 0xff) { /* ds1307, ds1338 */ + result = ds1307->read_block_data(client, ds1307->nvram_offset + off, count, buf); + } else { /* ds1388 */ + if ((off <= 0x00ff) && (off + count > 0x00ff)) { /* read spans two blocks */ + client = ds1307->client[1]; /* first block */ + addr = (unsigned int)off; + result = ds1307->read_block_data(client, addr, (0x100-addr), buf); + client = ds1307->client[2]; /* second block */ + result += ds1307->read_block_data(client, 0x00, (count+addr-0x100), (buf+0x100-addr)); + + } else { /* read spans one blocks */ + if (off <= 0x00ff) { + client = ds1307->client[1]; + addr = (unsigned int)off; + } else if (off <= 0x0200) { + client = ds1307->client[2]; + addr = (unsigned int)off - 0x100; + } + result = ds1307->read_block_data(client, addr, count, buf); + } + } if (result < 0) dev_err(&client->dev, "%s error %d\n", "nvram read", result); return result; @@ -565,18 +591,40 @@ ds1307_nvram_write(struct file *filp, st struct i2c_client *client; struct ds1307 *ds1307; int result; + unsigned int addr = 0; client = kobj_to_i2c_client(kobj); ds1307 = i2c_get_clientdata(client); - if (unlikely(off >= NVRAM_SIZE)) + if (unlikely(off >= ds1307->nvram_size)) return -EFBIG; - if ((off + count) > NVRAM_SIZE) - count = NVRAM_SIZE - off; + if ((off + count) > ds1307->nvram_size) + count = ds1307->nvram_size - off; if (unlikely(!count)) return count; - result = ds1307->write_block_data(client, 8 + off, count, buf); + if (ds1307->nvram_offset < 0xff) { /* ds1307, ds1338 */ + result = ds1307->write_block_data(client, ds1307->nvram_offset + off, count, buf); + } else { /* ds1388 */ + if ((off <= 0x00ff) && ((off + count) > 0x00ff)) { /* read spans two blocks */ + client = ds1307->client[1]; /* first block */ + addr = (unsigned int)off; + result = ds1307->write_block_data(client, addr, (0x100-addr), buf); + client = ds1307->client[2]; /* second block */ + result = ds1307->write_block_data(client, 0x00, (addr+count-0x100), (buf+0x100-addr)); + + } else { /* Device address/offset translation */ + dev_dbg(&client->dev, "Write spans one block\n"); + if (off <= 0x00ff) { + client = ds1307->client[1]; + addr = (unsigned int)off; + } else if (off <= 0x0200) { + client = ds1307->client[2]; + addr = (unsigned int)off - 0x100; + } + result = ds1307->write_block_data(client, addr, count, buf); + } + } if (result < 0) { dev_err(&client->dev, "%s error %d\n", "nvram write", result); return result; @@ -592,7 +640,6 @@ static struct bin_attribute nvram = { .read = ds1307_nvram_read, .write = ds1307_nvram_write, - .size = NVRAM_SIZE, }; /*----------------------------------------------------------------------*/ @@ -605,6 +652,7 @@ static int __devinit ds1307_probe(struct struct ds1307 *ds1307; int err = -ENODEV; int tmp; + int i; const struct chip_desc *chip = &chips[id->driver_data]; struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); int want_irq = false; @@ -624,9 +672,10 @@ static int __devinit ds1307_probe(struct i2c_set_clientdata(client, ds1307); - ds1307->client = client; + ds1307->client[0] = client; ds1307->type = id->driver_data; ds1307->offset = 0; + ds1307->num_addrs = 1; buf = ds1307->regs; if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) { @@ -642,12 +691,12 @@ static int __devinit ds1307_probe(struct case ds_1339: case ds_3231: /* has IRQ? */ - if (ds1307->client->irq > 0 && chip->alarm) { + if (client->irq > 0 && chip->alarm) { INIT_WORK(&ds1307->work, ds1307_work); want_irq = true; } /* get registers that the "rtc" read below won't read... */ - tmp = ds1307->read_block_data(ds1307->client, + tmp = ds1307->read_block_data(client, DS1337_REG_CONTROL, 2, buf); if (tmp != 2) { pr_debug("read error %d\n", tmp); @@ -681,7 +730,7 @@ static int __devinit ds1307_probe(struct break; case rx_8025: - tmp = i2c_smbus_read_i2c_block_data(ds1307->client, + tmp = i2c_smbus_read_i2c_block_data(client, RX8025_REG_CTRL1 << 4 | 0x08, 2, buf); if (tmp != 2) { pr_debug("read error %d\n", tmp); @@ -747,6 +796,14 @@ static int __devinit ds1307_probe(struct break; case ds_1388: ds1307->offset = 1; /* Seconds starts at 1 */ + ds1307->num_addrs = 3; /* uses 3 I2C addrs */ + ds1307->nvram_size = 512; /* 512 bytes EEPROM */ + ds1307->nvram_offset = 0xff; + break; + case ds_1307: + case ds_1338: + ds1307->nvram_size = 56; /* 56 bytes NVRAM */ + ds1307->nvram_offset = 8; break; default: break; @@ -754,7 +811,7 @@ static int __devinit ds1307_probe(struct read_rtc: /* read RTC registers */ - tmp = ds1307->read_block_data(ds1307->client, ds1307->offset, 8, buf); + tmp = ds1307->read_block_data(client, ds1307->offset, 8, buf); if (tmp != 8) { pr_debug("read error %d\n", tmp); err = -EIO; @@ -866,16 +923,35 @@ read_rtc: dev_dbg(&client->dev, "got IRQ %d\n", client->irq); } - if (chip->nvram56) { + if (chip->nvram) { + nvram.size = ds1307->nvram_size; err = sysfs_create_bin_file(&client->dev.kobj, &nvram); if (err == 0) { set_bit(HAS_NVRAM, &ds1307->flags); - dev_info(&client->dev, "56 bytes nvram\n"); + dev_info(&client->dev, "%d bytes nvram\n", nvram.size); + } + } + + /* use dummy devices for multiple address chips */ + for (i = 1; i < ds1307->num_addrs; i++) { + ds1307->client[i] = i2c_new_dummy(client->adapter, client->addr + i); + if (!ds1307->client[i]) { + dev_err(&client->dev, "address 0x%02x unavailable\n", + client->addr + i); + err = -EADDRINUSE; + goto err_clients; } + i2c_set_clientdata(ds1307->client[i], ds1307); } return 0; +err_clients: + for (i = 1; i < ds1307->num_addrs; i++) { + if (ds1307->client[i]) { + i2c_unregister_device(ds1307->client[i]); + } + } exit_irq: rtc_device_unregister(ds1307->rtc); exit_free: -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/