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path: root/drivers/gpio/gpio-pca953x.c
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Diffstat (limited to 'drivers/gpio/gpio-pca953x.c')
-rw-r--r--drivers/gpio/gpio-pca953x.c94
1 files changed, 58 insertions, 36 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 5638b4e5355f..06d6af60e6b7 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -306,37 +306,39 @@ static const struct regmap_config pca953x_i2c_regmap = {
.writeable_reg = pca953x_writeable_register,
.volatile_reg = pca953x_volatile_register,
+ .disable_locking = true,
.cache_type = REGCACHE_RBTREE,
- /* REVISIT: should be 0x7f but some 24 bit chips use REG_ADDR_AI */
- .max_register = 0xff,
+ .max_register = 0x7f,
};
-static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off,
- bool write, bool addrinc)
+static const struct regmap_config pca953x_ai_i2c_regmap = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .read_flag_mask = REG_ADDR_AI,
+ .write_flag_mask = REG_ADDR_AI,
+
+ .readable_reg = pca953x_readable_register,
+ .writeable_reg = pca953x_writeable_register,
+ .volatile_reg = pca953x_volatile_register,
+
+ .cache_type = REGCACHE_RBTREE,
+ .max_register = 0x7f,
+};
+
+static u8 pca953x_recalc_addr(struct pca953x_chip *chip, int reg, int off)
{
int bank_shift = pca953x_bank_shift(chip);
int addr = (reg & PCAL_GPIO_MASK) << bank_shift;
int pinctrl = (reg & PCAL_PINCTRL_MASK) << 1;
u8 regaddr = pinctrl | addr | (off / BANK_SZ);
- /* Single byte read doesn't need AI bit set. */
- if (!addrinc)
- return regaddr;
-
- /* Chips with 24 and more GPIOs always support Auto Increment */
- if (write && NBANK(chip) > 2)
- regaddr |= REG_ADDR_AI;
-
- /* PCA9575 needs address-increment on multi-byte writes */
- if (PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE)
- regaddr |= REG_ADDR_AI;
-
return regaddr;
}
static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
{
- u8 regaddr = pca953x_recalc_addr(chip, reg, 0, true, true);
+ u8 regaddr = pca953x_recalc_addr(chip, reg, 0);
u8 value[MAX_BANK];
int i, ret;
@@ -354,7 +356,7 @@ static int pca953x_write_regs(struct pca953x_chip *chip, int reg, unsigned long
static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *val)
{
- u8 regaddr = pca953x_recalc_addr(chip, reg, 0, false, true);
+ u8 regaddr = pca953x_recalc_addr(chip, reg, 0);
u8 value[MAX_BANK];
int i, ret;
@@ -373,8 +375,7 @@ static int pca953x_read_regs(struct pca953x_chip *chip, int reg, unsigned long *
static int pca953x_gpio_direction_input(struct gpio_chip *gc, unsigned off)
{
struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
- true, false);
+ u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off);
u8 bit = BIT(off % BANK_SZ);
int ret;
@@ -388,10 +389,8 @@ static int pca953x_gpio_direction_output(struct gpio_chip *gc,
unsigned off, int val)
{
struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
- true, false);
- u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off,
- true, false);
+ u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off);
+ u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off);
u8 bit = BIT(off % BANK_SZ);
int ret;
@@ -411,8 +410,7 @@ exit:
static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
{
struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 inreg = pca953x_recalc_addr(chip, chip->regs->input, off,
- true, false);
+ u8 inreg = pca953x_recalc_addr(chip, chip->regs->input, off);
u8 bit = BIT(off % BANK_SZ);
u32 reg_val;
int ret;
@@ -436,8 +434,7 @@ static int pca953x_gpio_get_value(struct gpio_chip *gc, unsigned off)
static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
{
struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off,
- true, false);
+ u8 outreg = pca953x_recalc_addr(chip, chip->regs->output, off);
u8 bit = BIT(off % BANK_SZ);
mutex_lock(&chip->i2c_lock);
@@ -448,8 +445,7 @@ static void pca953x_gpio_set_value(struct gpio_chip *gc, unsigned off, int val)
static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
{
struct pca953x_chip *chip = gpiochip_get_data(gc);
- u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off,
- true, false);
+ u8 dirreg = pca953x_recalc_addr(chip, chip->regs->direction, off);
u8 bit = BIT(off % BANK_SZ);
u32 reg_val;
int ret;
@@ -466,6 +462,23 @@ static int pca953x_gpio_get_direction(struct gpio_chip *gc, unsigned off)
return GPIO_LINE_DIRECTION_OUT;
}
+static int pca953x_gpio_get_multiple(struct gpio_chip *gc,
+ unsigned long *mask, unsigned long *bits)
+{
+ struct pca953x_chip *chip = gpiochip_get_data(gc);
+ DECLARE_BITMAP(reg_val, MAX_LINE);
+ int ret;
+
+ mutex_lock(&chip->i2c_lock);
+ ret = pca953x_read_regs(chip, chip->regs->input, reg_val);
+ mutex_unlock(&chip->i2c_lock);
+ if (ret)
+ return ret;
+
+ bitmap_replace(bits, bits, reg_val, mask, gc->ngpio);
+ return 0;
+}
+
static void pca953x_gpio_set_multiple(struct gpio_chip *gc,
unsigned long *mask, unsigned long *bits)
{
@@ -489,10 +502,8 @@ static int pca953x_gpio_set_pull_up_down(struct pca953x_chip *chip,
unsigned int offset,
unsigned long config)
{
- u8 pull_en_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_EN, offset,
- true, false);
- u8 pull_sel_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_SEL, offset,
- true, false);
+ u8 pull_en_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_EN, offset);
+ u8 pull_sel_reg = pca953x_recalc_addr(chip, PCAL953X_PULL_SEL, offset);
u8 bit = BIT(offset % BANK_SZ);
int ret;
@@ -551,6 +562,7 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
gc->get = pca953x_gpio_get_value;
gc->set = pca953x_gpio_set_value;
gc->get_direction = pca953x_gpio_get_direction;
+ gc->get_multiple = pca953x_gpio_get_multiple;
gc->set_multiple = pca953x_gpio_set_multiple;
gc->set_config = pca953x_gpio_set_config;
gc->can_sleep = true;
@@ -863,6 +875,7 @@ static int pca953x_probe(struct i2c_client *client,
int ret;
u32 invert = 0;
struct regulator *reg;
+ const struct regmap_config *regmap_config;
chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
if (chip == NULL)
@@ -925,7 +938,17 @@ static int pca953x_probe(struct i2c_client *client,
i2c_set_clientdata(client, chip);
- chip->regmap = devm_regmap_init_i2c(client, &pca953x_i2c_regmap);
+ pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
+
+ if (NBANK(chip) > 2 || PCA_CHIP_TYPE(chip->driver_data) == PCA957X_TYPE) {
+ dev_info(&client->dev, "using AI\n");
+ regmap_config = &pca953x_ai_i2c_regmap;
+ } else {
+ dev_info(&client->dev, "using no AI\n");
+ regmap_config = &pca953x_i2c_regmap;
+ }
+
+ chip->regmap = devm_regmap_init_i2c(client, regmap_config);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
goto err_exit;
@@ -956,7 +979,6 @@ static int pca953x_probe(struct i2c_client *client,
/* initialize cached registers from their original values.
* we can't share this chip with another i2c master.
*/
- pca953x_setup_gpio(chip, chip->driver_data & PCA_GPIO_MASK);
if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) {
chip->regs = &pca953x_regs;
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-12 16:14:51 +0300