[lm-sensors] [PATCH 2/3] hwmon: (lm78) Make ISA interface depend on CONFIG_ISA
Dean Nelson
dnelson at redhat.com
Mon Jul 25 22:00:49 CEST 2011
On 07/23/2011 11:10 AM, Jean Delvare wrote:
> We should only include support for the ISA interface of the LM78/LM79
> if CONFIG_ISA is set. Not only this makes the driver somewhat smaller
> on most architectures, but this also avoids poking at random I/O
> ports on these architectures.
>
> This is very similiar to what was done for the w83781d driver in
> October 2008.
>
> Signed-off-by: Jean Delvare<khali at linux-fr.org>
> Cc: Dean Nelson<dnelson at redhat.com>
> ---
> Dean, with these 2 patches, the lm78 driver should no longer crash on
> PPC64. Please test and report if you can.
I reviewed your two patches, and they look good to me.
An lm78 driver built with these two patches modprobed cleanly on a
PPC64.
Thanks for creating the patches.
Dean
> drivers/hwmon/lm78.c | 98 ++++++++++++++++++++++++++++++++++++++++----------
> 1 file changed, 79 insertions(+), 19 deletions(-)
>
> --- linux-3.0.orig/drivers/hwmon/lm78.c 2011-07-23 14:21:25.000000000 +0200
> +++ linux-3.0/drivers/hwmon/lm78.c 2011-07-23 14:42:04.000000000 +0200
> @@ -2,7 +2,7 @@
> lm78.c - Part of lm_sensors, Linux kernel modules for hardware
> monitoring
> Copyright (c) 1998, 1999 Frodo Looijaard<frodol at dds.nl>
> - Copyright (c) 2007 Jean Delvare<khali at linux-fr.org>
> + Copyright (c) 2007, 2011 Jean Delvare<khali at 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
> @@ -26,23 +26,21 @@
> #include<linux/slab.h>
> #include<linux/jiffies.h>
> #include<linux/i2c.h>
> -#include<linux/platform_device.h>
> -#include<linux/ioport.h>
> #include<linux/hwmon.h>
> #include<linux/hwmon-vid.h>
> #include<linux/hwmon-sysfs.h>
> #include<linux/err.h>
> #include<linux/mutex.h>
> -#include<linux/io.h>
>
> -/* ISA device, if found */
> -static struct platform_device *pdev;
> +#ifdef CONFIG_ISA
> +#include<linux/platform_device.h>
> +#include<linux/ioport.h>
> +#include<linux/io.h>
> +#endif
>
> /* Addresses to scan */
> static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
> 0x2e, 0x2f, I2C_CLIENT_END };
> -static unsigned short isa_address = 0x290;
> -
> enum chips { lm78, lm79 };
>
> /* Many LM78 constants specified below */
> @@ -476,6 +474,16 @@ static const struct attribute_group lm78
> .attrs = lm78_attributes,
> };
>
> +/*
> + * ISA related code
> + */
> +#ifdef CONFIG_ISA
> +
> +/* ISA device, if found */
> +static struct platform_device *pdev;
> +
> +static unsigned short isa_address = 0x290;
> +
> /* I2C devices get this name attribute automatically, but for ISA devices
> we must create it by ourselves. */
> static ssize_t show_name(struct device *dev, struct device_attribute
> @@ -487,6 +495,11 @@ static ssize_t show_name(struct device *
> }
> static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
>
> +static struct lm78_data *lm78_data_if_isa(void)
> +{
> + return pdev ? platform_get_drvdata(pdev) : NULL;
> +}
> +
> /* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
> static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
> {
> @@ -520,12 +533,24 @@ static int lm78_alias_detect(struct i2c_
>
> return 1;
> }
> +#else /* !CONFIG_ISA */
> +
> +static int lm78_alias_detect(struct i2c_client *client, u8 chipid)
> +{
> + return 0;
> +}
> +
> +static struct lm78_data *lm78_data_if_isa(void)
> +{
> + return NULL;
> +}
> +#endif /* CONFIG_ISA */
>
> static int lm78_i2c_detect(struct i2c_client *client,
> struct i2c_board_info *info)
> {
> int i;
> - struct lm78_data *isa = pdev ? platform_get_drvdata(pdev) : NULL;
> + struct lm78_data *isa = lm78_data_if_isa();
> const char *client_name;
> struct i2c_adapter *adapter = client->adapter;
> int address = client->addr;
> @@ -653,6 +678,7 @@ static int lm78_read_value(struct lm78_d
> {
> struct i2c_client *client = data->client;
>
> +#ifdef CONFIG_ISA
> if (!client) { /* ISA device */
> int res;
> mutex_lock(&data->lock);
> @@ -661,6 +687,7 @@ static int lm78_read_value(struct lm78_d
> mutex_unlock(&data->lock);
> return res;
> } else
> +#endif
> return i2c_smbus_read_byte_data(client, reg);
> }
>
> @@ -675,6 +702,7 @@ static int lm78_write_value(struct lm78_
> {
> struct i2c_client *client = data->client;
>
> +#ifdef CONFIG_ISA
> if (!client) { /* ISA device */
> mutex_lock(&data->lock);
> outb_p(reg, data->isa_addr + LM78_ADDR_REG_OFFSET);
> @@ -682,6 +710,7 @@ static int lm78_write_value(struct lm78_
> mutex_unlock(&data->lock);
> return 0;
> } else
> +#endif
> return i2c_smbus_write_byte_data(client, reg, value);
> }
>
> @@ -759,6 +788,7 @@ static struct lm78_data *lm78_update_dev
> return data;
> }
>
> +#ifdef CONFIG_ISA
> static int __devinit lm78_isa_probe(struct platform_device *pdev)
> {
> int err;
> @@ -960,12 +990,10 @@ static int __init lm78_isa_device_add(un
> return err;
> }
>
> -static int __init sm_lm78_init(void)
> +static int __init lm78_isa_register(void)
> {
> int res;
>
> - /* We register the ISA device first, so that we can skip the
> - * registration of an I2C interface to the same device. */
> if (lm78_isa_found(isa_address)) {
> res = platform_driver_register(&lm78_isa_driver);
> if (res)
> @@ -977,26 +1005,58 @@ static int __init sm_lm78_init(void)
> goto exit_unreg_isa_driver;
> }
>
> - res = i2c_add_driver(&lm78_driver);
> - if (res)
> - goto exit_unreg_isa_device;
> -
> return 0;
>
> - exit_unreg_isa_device:
> - platform_device_unregister(pdev);
> exit_unreg_isa_driver:
> platform_driver_unregister(&lm78_isa_driver);
> exit:
> return res;
> }
>
> -static void __exit sm_lm78_exit(void)
> +static void lm78_isa_unregister(void)
> {
> if (pdev) {
> platform_device_unregister(pdev);
> platform_driver_unregister(&lm78_isa_driver);
> }
> +}
> +#else /* !CONFIG_ISA */
> +
> +static int __init lm78_isa_register(void)
> +{
> + return 0;
> +}
> +
> +static void lm78_isa_unregister(void)
> +{
> +}
> +#endif /* CONFIG_ISA */
> +
> +static int __init sm_lm78_init(void)
> +{
> + int res;
> +
> + /* We register the ISA device first, so that we can skip the
> + * registration of an I2C interface to the same device. */
> + res = lm78_isa_register();
> + if (res)
> + goto exit;
> +
> + res = i2c_add_driver(&lm78_driver);
> + if (res)
> + goto exit_unreg_isa_device;
> +
> + return 0;
> +
> + exit_unreg_isa_device:
> + lm78_isa_unregister();
> + exit:
> + return res;
> +}
> +
> +static void __exit sm_lm78_exit(void)
> +{
> + lm78_isa_unregister();
> i2c_del_driver(&lm78_driver);
> }
>
>
>
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