From: Austin Boyle <Austin.Boyle@aviatnet.com>
To: Wolfram Sang <w.sang@pengutronix.de>
Cc: <rtc-linux@googlegroups.com>, <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3] rtc: ds1307: generalise ram size and offset
Date: Thu, 12 Jan 2012 11:21:56 +1300 [thread overview]
Message-ID: <1326320516.3096.64.camel@pc786-ubu.gnet.global.vpn> (raw)
In-Reply-To: <20120111110650.GC2605@pengutronix.de>
Hi Wolfram,
Thanks for reviewing the patch.
> I think the stuff related to 'offset' should be in a separate patch with
> specific commit-msg.
Agreed. I will submit a separate patch after this one.
---
This patch generalises NVRAM to support RAM with other size and offset, such
as the 64 bytes of SRAM on the mcp7941x.
Signed-off-by: Austin Boyle <Austin.Boyle@aviatnet.com>
---
this patch is based on Wolfram Sang's tree:
git://git.pengutronix.de/git/wsa/linux-2.6.git ds1307
patch depends on:
rtc: ds1307: comment and format cleanup 21af5f7bd6
rtc: ds1307: simplify irq setup code 8c63e03627
rtc: ds1307: refactor chip_desc table e246db081d
rtc: add initial support for mcp7941x parts e69bba2d3a
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -105,6 +105,8 @@ enum ds_type {
struct ds1307 {
u8 offset; /* register's offset */
u8 regs[11];
+ u16 nvram_offset;
+ u16 nvram_size;
enum ds_type type;
unsigned long flags;
#define HAS_NVRAM 0 /* bit 0 == sysfs file active */
@@ -119,19 +121,22 @@ struct ds1307 {
};
struct chip_desc {
- unsigned nvram56:1;
unsigned alarm:1;
+ u16 nvram_offset;
+ u16 nvram_size;
};
static const struct chip_desc chips[last_ds_type] = {
[ds_1307] = {
- .nvram56 = 1,
+ .nvram_offset = 8,
+ .nvram_size = 56,
},
[ds_1337] = {
.alarm = 1,
},
[ds_1338] = {
- .nvram56 = 1,
+ .nvram_offset = 8,
+ .nvram_size = 56,
},
[ds_1339] = {
.alarm = 1,
@@ -139,6 +144,11 @@ static const struct chip_desc chips[last_ds_type] = {
[ds_3231] = {
.alarm = 1,
},
+ [mcp7941x] = {
+ /* this is battery backed SRAM */
+ .nvram_offset = 0x20,
+ .nvram_size = 0x40,
+ },
};
static const struct i2c_device_id ds1307_id[] = {
@@ -543,8 +553,6 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
/*----------------------------------------------------------------------*/
-#define NVRAM_SIZE 56
-
static ssize_t
ds1307_nvram_read(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr,
@@ -557,14 +565,15 @@ ds1307_nvram_read(struct file *filp, struct kobject *kobj,
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);
+ result = ds1307->read_block_data(client, ds1307->nvram_offset + off,
+ count, buf);
if (result < 0)
dev_err(&client->dev, "%s error %d\n", "nvram read", result);
return result;
@@ -582,14 +591,15 @@ ds1307_nvram_write(struct file *filp, struct kobject *kobj,
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);
+ result = ds1307->write_block_data(client, ds1307->nvram_offset + off,
+ count, buf);
if (result < 0) {
dev_err(&client->dev, "%s error %d\n", "nvram write", result);
return result;
@@ -605,7 +615,6 @@ static struct bin_attribute nvram = {
.read = ds1307_nvram_read,
.write = ds1307_nvram_write,
- .size = NVRAM_SIZE,
};
/*----------------------------------------------------------------------*/
@@ -638,7 +647,12 @@ static int __devinit ds1307_probe(struct i2c_client *client,
ds1307->client = client;
ds1307->type = id->driver_data;
- ds1307->offset = 0;
+ if (chip) {
+ if (chip->nvram_size)
+ ds1307->nvram_size = chip->nvram_size;
+ if (chip->nvram_offset)
+ ds1307->nvram_offset = chip->nvram_offset;
+ }
buf = ds1307->regs;
if (i2c_check_functionality(adapter, I2C_FUNC_SMBUS_I2C_BLOCK)) {
@@ -893,11 +907,12 @@ read_rtc:
dev_dbg(&client->dev, "got IRQ %d\n", client->irq);
}
- if (chip && chip->nvram56) {
+ if (chip && chip->nvram_size) {
+ 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, "%zd bytes nvram\n", nvram.size);
}
}
next prev parent reply other threads:[~2012-01-11 22:22 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-09 21:21 [PATCH v3] rtc: ds1307: generalise ram size and offset Austin Boyle
2012-01-09 22:17 ` Wolfram Sang
2012-01-10 0:33 ` Austin Boyle
2012-01-11 11:06 ` Wolfram Sang
2012-01-11 22:21 ` Austin Boyle [this message]
2012-01-18 21:41 ` Wolfram Sang
2012-01-19 19:45 ` Wolfram Sang
2012-02-02 0:37 ` Austin Boyle
2012-02-02 14:53 ` [rtc-linux] " Wolfram Sang
2012-02-02 22:28 ` Austin Boyle
2012-02-07 14:56 ` Wolfram Sang
2012-02-07 21:45 ` Austin Boyle
2012-02-08 22:23 ` [PATCH v4] " Austin Boyle
2012-02-08 22:36 ` Andrew Morton
2012-02-13 14:36 ` Wolfram Sang
2012-02-14 4:23 ` Austin Boyle
2012-02-21 14:00 ` Wolfram Sang
-- strict thread matches above, loose matches on Subject: below --
2011-11-03 21:07 [PATCH v3] " Austin Boyle
2011-11-03 21:25 ` David Anders
2011-12-19 1:24 ` Austin Boyle
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