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sm501: gpio I2C support 

Add support for adding the GPIO based I2C resources.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Cc: Arnaud Patard <apatard@mandriva.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
hifive-unleashed-5.1
Ben Dooks 2008-07-25 01:46:01 -07:00 committed by Linus Torvalds
parent 60e540d617
commit 42cd2366fb
2 changed files with 84 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

76
drivers/mfd/sm501.c
View File

@ -20,6 +20,7 @@
#include <linux/platform_device.h>
#include <linux/pci.h>
#include <linux/gpio.h>
#include <linux/i2c-gpio.h>
#include <linux/sm501.h>
#include <linux/sm501-regs.h>
@ -1086,6 +1087,11 @@ static void sm501_gpio_remove(struct sm501_devdata *sm)
dev_err(sm->dev, "cannot remove high chip, cannot tidy up\n");
}
static int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
{
struct sm501_gpio *gpio = &sm->gpio;
return pin + (pin < 32) ? gpio->low.gpio.base : gpio->high.gpio.base;
}
#else
static int sm501_register_gpio(struct sm501_devdata *sm)
{
@ -1095,8 +1101,66 @@ static int sm501_register_gpio(struct sm501_devdata *sm)
static void sm501_gpio_remove(struct sm501_devdata *sm)
{
}
static int sm501_gpio_pin2nr(struct sm501_devdata *sm, unsigned int pin)
{
return -1;
}
#endif
static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
struct sm501_platdata_gpio_i2c *iic)
{
struct i2c_gpio_platform_data *icd;
struct platform_device *pdev;
pdev = sm501_create_subdev(sm, "i2c-gpio", 0,
sizeof(struct i2c_gpio_platform_data));
if (!pdev)
return -ENOMEM;
icd = pdev->dev.platform_data;
/* We keep the pin_sda and pin_scl fields relative in case the
* same platform data is passed to >1 SM501.
*/
icd->sda_pin = sm501_gpio_pin2nr(sm, iic->pin_sda);
icd->scl_pin = sm501_gpio_pin2nr(sm, iic->pin_scl);
icd->timeout = iic->timeout;
icd->udelay = iic->udelay;
/* note, we can't use either of the pin numbers, as the i2c-gpio
* driver uses the platform.id field to generate the bus number
* to register with the i2c core; The i2c core doesn't have enough
* entries to deal with anything we currently use.
*/
pdev->id = iic->bus_num;
dev_info(sm->dev, "registering i2c-%d: sda=%d (%d), scl=%d (%d)\n",
iic->bus_num,
icd->sda_pin, iic->pin_sda, icd->scl_pin, iic->pin_scl);
return sm501_register_device(sm, pdev);
}
static int sm501_register_gpio_i2c(struct sm501_devdata *sm,
struct sm501_platdata *pdata)
{
struct sm501_platdata_gpio_i2c *iic = pdata->gpio_i2c;
int index;
int ret;
for (index = 0; index < pdata->gpio_i2c_nr; index++, iic++) {
ret = sm501_register_gpio_i2c_instance(sm, iic);
if (ret < 0)
return ret;
}
return 0;
}
/* sm501_dbg_regs
*
* Debug attribute to attach to parent device to show core registers
@ -1204,6 +1268,7 @@ static unsigned int sm501_mem_local[] = {
static int sm501_init_dev(struct sm501_devdata *sm)
{
struct sm501_initdata *idata;
struct sm501_platdata *pdata;
resource_size_t mem_avail;
unsigned long dramctrl;
unsigned long devid;
@ -1242,7 +1307,9 @@ static int sm501_init_dev(struct sm501_devdata *sm)
/* check to see if we have some device initialisation */
idata = sm->platdata ? sm->platdata->init : NULL;
pdata = sm->platdata;
idata = pdata ? pdata->init : NULL;
if (idata) {
sm501_init_regs(sm, idata);
@ -1254,6 +1321,13 @@ static int sm501_init_dev(struct sm501_devdata *sm)
sm501_register_gpio(sm);
}
if (pdata->gpio_i2c != NULL && pdata->gpio_i2c_nr > 0) {
if (!sm->gpio.registered)
dev_err(sm->dev, "no gpio registered for i2c gpio.\n");
else
sm501_register_gpio_i2c(sm, pdata);
}
ret = sm501_check_clocks(sm);
if (ret) {
dev_err(sm->dev, "M1X and M clocks sourced from different "

10
include/linux/sm501.h
View File

@ -86,11 +86,19 @@ struct sm501_platdata_fb {
struct sm501_platdata_fbsub *fb_pnl;
};
/* gpio i2c */
/* gpio i2c
*
* Note, we have to pass in the bus number, as the number used will be
* passed to the i2c-gpio driver's platform_device.id, subsequently used
* to register the i2c bus.
*/
struct sm501_platdata_gpio_i2c {
unsigned int bus_num;
unsigned int pin_sda;
unsigned int pin_scl;
int udelay;
int timeout;
};
/* sm501_initdata