gpio/pca953x: Add support for pca9574 and pca9575 devices
PCA957x is i2c gpio expander, and similar to PCA953x. Although register configurations are different between PCA957x and PCA953x. They can share a lot of components, such as IRQ handling, GPIO IN/OUT. So updating PCA953x driver to support PCA957x chips. Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Haojian Zhuang
Grant Likely
parent
073cc4e95a
commit
33226ffd07
1 changed files with 188 additions and 55 deletions
|
|
@ -24,33 +24,46 @@
|
|||
#include <linux/of_gpio.h>
|
||||
#endif
|
||||
|
||||
#define PCA953X_INPUT 0
|
||||
#define PCA953X_OUTPUT 1
|
||||
#define PCA953X_INVERT 2
|
||||
#define PCA953X_DIRECTION 3
|
||||
#define PCA953X_INPUT 0
|
||||
#define PCA953X_OUTPUT 1
|
||||
#define PCA953X_INVERT 2
|
||||
#define PCA953X_DIRECTION 3
|
||||
|
||||
#define PCA953X_GPIOS 0x00FF
|
||||
#define PCA953X_INT 0x0100
|
||||
#define PCA957X_IN 0
|
||||
#define PCA957X_INVRT 1
|
||||
#define PCA957X_BKEN 2
|
||||
#define PCA957X_PUPD 3
|
||||
#define PCA957X_CFG 4
|
||||
#define PCA957X_OUT 5
|
||||
#define PCA957X_MSK 6
|
||||
#define PCA957X_INTS 7
|
||||
|
||||
#define PCA_GPIO_MASK 0x00FF
|
||||
#define PCA_INT 0x0100
|
||||
#define PCA953X_TYPE 0x1000
|
||||
#define PCA957X_TYPE 0x2000
|
||||
|
||||
static const struct i2c_device_id pca953x_id[] = {
|
||||
{ "pca9534", 8 | PCA953X_INT, },
|
||||
{ "pca9535", 16 | PCA953X_INT, },
|
||||
{ "pca9536", 4, },
|
||||
{ "pca9537", 4 | PCA953X_INT, },
|
||||
{ "pca9538", 8 | PCA953X_INT, },
|
||||
{ "pca9539", 16 | PCA953X_INT, },
|
||||
{ "pca9554", 8 | PCA953X_INT, },
|
||||
{ "pca9555", 16 | PCA953X_INT, },
|
||||
{ "pca9556", 8, },
|
||||
{ "pca9557", 8, },
|
||||
{ "pca9534", 8 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9535", 16 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9536", 4 | PCA953X_TYPE, },
|
||||
{ "pca9537", 4 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9538", 8 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9539", 16 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9554", 8 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9555", 16 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca9556", 8 | PCA953X_TYPE, },
|
||||
{ "pca9557", 8 | PCA953X_TYPE, },
|
||||
{ "pca9574", 8 | PCA957X_TYPE | PCA_INT, },
|
||||
{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
|
||||
|
||||
{ "max7310", 8, },
|
||||
{ "max7312", 16 | PCA953X_INT, },
|
||||
{ "max7313", 16 | PCA953X_INT, },
|
||||
{ "max7315", 8 | PCA953X_INT, },
|
||||
{ "pca6107", 8 | PCA953X_INT, },
|
||||
{ "tca6408", 8 | PCA953X_INT, },
|
||||
{ "tca6416", 16 | PCA953X_INT, },
|
||||
{ "max7310", 8 | PCA953X_TYPE, },
|
||||
{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "max7313", 16 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "max7315", 8 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "pca6107", 8 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "tca6408", 8 | PCA953X_TYPE | PCA_INT, },
|
||||
{ "tca6416", 16 | PCA953X_TYPE | PCA_INT, },
|
||||
/* NYET: { "tca6424", 24, }, */
|
||||
{ }
|
||||
};
|
||||
|
|
@ -75,16 +88,32 @@ struct pca953x_chip {
|
|||
struct pca953x_platform_data *dyn_pdata;
|
||||
struct gpio_chip gpio_chip;
|
||||
const char *const *names;
|
||||
int chip_type;
|
||||
};
|
||||
|
||||
static int pca953x_write_reg(struct pca953x_chip *chip, int reg, uint16_t val)
|
||||
{
|
||||
int ret;
|
||||
int ret = 0;
|
||||
|
||||
if (chip->gpio_chip.ngpio <= 8)
|
||||
ret = i2c_smbus_write_byte_data(chip->client, reg, val);
|
||||
else
|
||||
ret = i2c_smbus_write_word_data(chip->client, reg << 1, val);
|
||||
else {
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
ret = i2c_smbus_write_word_data(chip->client,
|
||||
reg << 1, val);
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
ret = i2c_smbus_write_byte_data(chip->client, reg << 1,
|
||||
val & 0xff);
|
||||
if (ret < 0)
|
||||
break;
|
||||
ret = i2c_smbus_write_byte_data(chip->client,
|
||||
(reg << 1) + 1,
|
||||
(val & 0xff00) >> 8);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (ret < 0) {
|
||||
dev_err(&chip->client->dev, "failed writing register\n");
|
||||
|
|
@ -116,13 +145,22 @@ static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
|
|||
{
|
||||
struct pca953x_chip *chip;
|
||||
uint16_t reg_val;
|
||||
int ret;
|
||||
int ret, offset = 0;
|
||||
|
||||
chip = container_of(gc, struct pca953x_chip, gpio_chip);
|
||||
|
||||
mutex_lock(&chip->i2c_lock);
|
||||
reg_val = chip->reg_direction | (1u << off);
|
||||
ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
|
||||
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_DIRECTION;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_CFG;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_write_reg(chip, offset, reg_val);
|
||||
if (ret)
|
||||
goto exit;
|
||||
|
||||
|
|
@ -138,7 +176,7 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
|
|||
{
|
||||
struct pca953x_chip *chip;
|
||||
uint16_t reg_val;
|
||||
int ret;
|
||||
int ret, offset = 0;
|
||||
|
||||
chip = container_of(gc, struct pca953x_chip, gpio_chip);
|
||||
|
||||
|
|
@ -149,7 +187,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
|
|||
else
|
||||
reg_val = chip->reg_output & ~(1u << off);
|
||||
|
||||
ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_OUTPUT;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_OUT;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_write_reg(chip, offset, reg_val);
|
||||
if (ret)
|
||||
goto exit;
|
||||
|
||||
|
|
@ -157,7 +203,15 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
|
|||
|
||||
/* then direction */
|
||||
reg_val = chip->reg_direction & ~(1u << off);
|
||||
ret = pca953x_write_reg(chip, PCA953X_DIRECTION, reg_val);
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_DIRECTION;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_CFG;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_write_reg(chip, offset, reg_val);
|
||||
if (ret)
|
||||
goto exit;
|
||||
|
||||
|
|
@ -172,12 +226,20 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
|
|||
{
|
||||
struct pca953x_chip *chip;
|
||||
uint16_t reg_val;
|
||||
int ret;
|
||||
int ret, offset = 0;
|
||||
|
||||
chip = container_of(gc, struct pca953x_chip, gpio_chip);
|
||||
|
||||
mutex_lock(&chip->i2c_lock);
|
||||
ret = pca953x_read_reg(chip, PCA953X_INPUT, ®_val);
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_INPUT;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_IN;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_read_reg(chip, offset, ®_val);
|
||||
mutex_unlock(&chip->i2c_lock);
|
||||
if (ret < 0) {
|
||||
/* NOTE: diagnostic already emitted; that's all we should
|
||||
|
|
@ -194,7 +256,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
|
|||
{
|
||||
struct pca953x_chip *chip;
|
||||
uint16_t reg_val;
|
||||
int ret;
|
||||
int ret, offset = 0;
|
||||
|
||||
chip = container_of(gc, struct pca953x_chip, gpio_chip);
|
||||
|
||||
|
|
@ -204,7 +266,15 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
|
|||
else
|
||||
reg_val = chip->reg_output & ~(1u << off);
|
||||
|
||||
ret = pca953x_write_reg(chip, PCA953X_OUTPUT, reg_val);
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_OUTPUT;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_OUT;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_write_reg(chip, offset, reg_val);
|
||||
if (ret)
|
||||
goto exit;
|
||||
|
||||
|
|
@ -322,9 +392,17 @@ static uint16_t pca953x_irq_pending(struct pca953x_chip *chip)
|
|||
uint16_t old_stat;
|
||||
uint16_t pending;
|
||||
uint16_t trigger;
|
||||
int ret;
|
||||
int ret, offset = 0;
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA953X_INPUT, &cur_stat);
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_INPUT;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_IN;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_read_reg(chip, offset, &cur_stat);
|
||||
if (ret)
|
||||
return 0;
|
||||
|
||||
|
|
@ -372,14 +450,21 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
|
|||
{
|
||||
struct i2c_client *client = chip->client;
|
||||
struct pca953x_platform_data *pdata = client->dev.platform_data;
|
||||
int ret;
|
||||
int ret, offset = 0;
|
||||
|
||||
if (pdata->irq_base != -1
|
||||
&& (id->driver_data & PCA953X_INT)) {
|
||||
&& (id->driver_data & PCA_INT)) {
|
||||
int lvl;
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA953X_INPUT,
|
||||
&chip->irq_stat);
|
||||
switch (chip->chip_type) {
|
||||
case PCA953X_TYPE:
|
||||
offset = PCA953X_INPUT;
|
||||
break;
|
||||
case PCA957X_TYPE:
|
||||
offset = PCA957X_IN;
|
||||
break;
|
||||
}
|
||||
ret = pca953x_read_reg(chip, offset, &chip->irq_stat);
|
||||
if (ret)
|
||||
goto out_failed;
|
||||
|
||||
|
|
@ -439,7 +524,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
|
|||
struct i2c_client *client = chip->client;
|
||||
struct pca953x_platform_data *pdata = client->dev.platform_data;
|
||||
|
||||
if (pdata->irq_base != -1 && (id->driver_data & PCA953X_INT))
|
||||
if (pdata->irq_base != -1 && (id->driver_data & PCA_INT))
|
||||
dev_warn(&client->dev, "interrupt support not compiled in\n");
|
||||
|
||||
return 0;
|
||||
|
|
@ -499,12 +584,65 @@ pca953x_get_alt_pdata(struct i2c_client *client)
|
|||
}
|
||||
#endif
|
||||
|
||||
static int __devinit device_pca953x_init(struct pca953x_chip *chip, int invert)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA953X_DIRECTION,
|
||||
&chip->reg_direction);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
/* set platform specific polarity inversion */
|
||||
ret = pca953x_write_reg(chip, PCA953X_INVERT, invert);
|
||||
if (ret)
|
||||
goto out;
|
||||
return 0;
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devinit device_pca957x_init(struct pca953x_chip *chip, int invert)
|
||||
{
|
||||
int ret;
|
||||
uint16_t val = 0;
|
||||
|
||||
/* Let every port in proper state, that could save power */
|
||||
pca953x_write_reg(chip, PCA957X_PUPD, 0x0);
|
||||
pca953x_write_reg(chip, PCA957X_CFG, 0xffff);
|
||||
pca953x_write_reg(chip, PCA957X_OUT, 0x0);
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA957X_IN, &val);
|
||||
if (ret)
|
||||
goto out;
|
||||
ret = pca953x_read_reg(chip, PCA957X_OUT, &chip->reg_output);
|
||||
if (ret)
|
||||
goto out;
|
||||
ret = pca953x_read_reg(chip, PCA957X_CFG, &chip->reg_direction);
|
||||
if (ret)
|
||||
goto out;
|
||||
|
||||
/* set platform specific polarity inversion */
|
||||
pca953x_write_reg(chip, PCA957X_INVRT, invert);
|
||||
|
||||
/* To enable register 6, 7 to controll pull up and pull down */
|
||||
pca953x_write_reg(chip, PCA957X_BKEN, 0x202);
|
||||
|
||||
return 0;
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int __devinit pca953x_probe(struct i2c_client *client,
|
||||
const struct i2c_device_id *id)
|
||||
{
|
||||
struct pca953x_platform_data *pdata;
|
||||
struct pca953x_chip *chip;
|
||||
int ret;
|
||||
int ret = 0;
|
||||
|
||||
chip = kzalloc(sizeof(struct pca953x_chip), GFP_KERNEL);
|
||||
if (chip == NULL)
|
||||
|
|
@ -531,25 +669,20 @@ static int __devinit pca953x_probe(struct i2c_client *client,
|
|||
chip->gpio_start = pdata->gpio_base;
|
||||
|
||||
chip->names = pdata->names;
|
||||
chip->chip_type = id->driver_data & (PCA953X_TYPE | PCA957X_TYPE);
|
||||
|
||||
mutex_init(&chip->i2c_lock);
|
||||
|
||||
/* initialize cached registers from their original values.
|
||||
* we can't share this chip with another i2c master.
|
||||
*/
|
||||
pca953x_setup_gpio(chip, id->driver_data & PCA953X_GPIOS);
|
||||
pca953x_setup_gpio(chip, id->driver_data & PCA_GPIO_MASK);
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA953X_OUTPUT, &chip->reg_output);
|
||||
if (ret)
|
||||
goto out_failed;
|
||||
|
||||
ret = pca953x_read_reg(chip, PCA953X_DIRECTION, &chip->reg_direction);
|
||||
if (ret)
|
||||
goto out_failed;
|
||||
|
||||
/* set platform specific polarity inversion */
|
||||
ret = pca953x_write_reg(chip, PCA953X_INVERT, pdata->invert);
|
||||
if (ret)
|
||||
if (chip->chip_type == PCA953X_TYPE)
|
||||
device_pca953x_init(chip, pdata->invert);
|
||||
else if (chip->chip_type == PCA957X_TYPE)
|
||||
device_pca957x_init(chip, pdata->invert);
|
||||
else
|
||||
goto out_failed;
|
||||
|
||||
ret = pca953x_irq_setup(chip, id);
|
||||
|
|
|
|||
Loading…
Reference in a new issue