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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.c190
1 files changed, 131 insertions, 59 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 0dc96419efe3..7e76830b3368 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -65,7 +65,7 @@
#define PCA_INT 0x0100
#define PCA_PCAL 0x0200
-#define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
+#define PCA_LATCH_INT (PCA_PCAL | PCA_INT)
#define PCA953X_TYPE 0x1000
#define PCA957X_TYPE 0x2000
#define PCA_TYPE_MASK 0xF000
@@ -88,8 +88,9 @@ static const struct i2c_device_id pca953x_id[] = {
{ "pca9575", 16 | PCA957X_TYPE | PCA_INT, },
{ "pca9698", 40 | PCA953X_TYPE, },
- { "pcal6524", 24 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
- { "pcal9555a", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
+ { "pcal6416", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
+ { "pcal6524", 24 | PCA953X_TYPE | PCA_LATCH_INT, },
+ { "pcal9555a", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
{ "max7310", 8 | PCA953X_TYPE, },
{ "max7312", 16 | PCA953X_TYPE | PCA_INT, },
@@ -108,7 +109,7 @@ static const struct i2c_device_id pca953x_id[] = {
MODULE_DEVICE_TABLE(i2c, pca953x_id);
static const struct acpi_device_id pca953x_acpi_ids[] = {
- { "INT3491", 16 | PCA953X_TYPE | PCA_INT | PCA_PCAL, },
+ { "INT3491", 16 | PCA953X_TYPE | PCA_LATCH_INT, },
{ }
};
MODULE_DEVICE_TABLE(acpi, pca953x_acpi_ids);
@@ -150,6 +151,7 @@ struct pca953x_chip {
u8 irq_stat[MAX_BANK];
u8 irq_trig_raise[MAX_BANK];
u8 irq_trig_fall[MAX_BANK];
+ struct irq_chip irq_chip;
#endif
struct i2c_client *client;
@@ -178,6 +180,8 @@ static int pca953x_bank_shift(struct pca953x_chip *chip)
#define PCA957x_BANK_OUTPUT BIT(5)
#define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2)
+#define PCAL9xxx_BANK_PULL_EN BIT(8 + 3)
+#define PCAL9xxx_BANK_PULL_SEL BIT(8 + 4)
#define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5)
#define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6)
@@ -199,6 +203,8 @@ static int pca953x_bank_shift(struct pca953x_chip *chip)
* - Extended set, above 0x40, often chip specific.
* - PCAL6524/PCAL9555A with custom PCAL IRQ handling:
* Input latch register 0x40 + 2 * bank_size RW
+ * Pull-up/pull-down enable reg 0x40 + 3 * bank_size RW
+ * Pull-up/pull-down select reg 0x40 + 4 * bank_size RW
* Interrupt mask register 0x40 + 5 * bank_size RW
* Interrupt status register 0x40 + 6 * bank_size R
*
@@ -247,7 +253,8 @@ static bool pca953x_readable_register(struct device *dev, unsigned int reg)
}
if (chip->driver_data & PCA_PCAL) {
- bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_IRQ_MASK |
+ bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
+ PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK |
PCAL9xxx_BANK_IRQ_STAT;
}
@@ -268,7 +275,8 @@ static bool pca953x_writeable_register(struct device *dev, unsigned int reg)
}
if (chip->driver_data & PCA_PCAL)
- bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_IRQ_MASK;
+ bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_PULL_EN |
+ PCAL9xxx_BANK_PULL_SEL | PCAL9xxx_BANK_IRQ_MASK;
return pca953x_check_register(chip, reg, bank);
}
@@ -473,6 +481,61 @@ exit:
mutex_unlock(&chip->i2c_lock);
}
+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 bit = BIT(offset % BANK_SZ);
+ int ret;
+
+ /*
+ * pull-up/pull-down configuration requires PCAL extended
+ * registers
+ */
+ if (!(chip->driver_data & PCA_PCAL))
+ return -ENOTSUPP;
+
+ mutex_lock(&chip->i2c_lock);
+
+ /* Disable pull-up/pull-down */
+ ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, 0);
+ if (ret)
+ goto exit;
+
+ /* Configure pull-up/pull-down */
+ if (config == PIN_CONFIG_BIAS_PULL_UP)
+ ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, bit);
+ else if (config == PIN_CONFIG_BIAS_PULL_DOWN)
+ ret = regmap_write_bits(chip->regmap, pull_sel_reg, bit, 0);
+ if (ret)
+ goto exit;
+
+ /* Enable pull-up/pull-down */
+ ret = regmap_write_bits(chip->regmap, pull_en_reg, bit, bit);
+
+exit:
+ mutex_unlock(&chip->i2c_lock);
+ return ret;
+}
+
+static int pca953x_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
+ unsigned long config)
+{
+ struct pca953x_chip *chip = gpiochip_get_data(gc);
+
+ switch (config) {
+ case PIN_CONFIG_BIAS_PULL_UP:
+ case PIN_CONFIG_BIAS_PULL_DOWN:
+ return pca953x_gpio_set_pull_up_down(chip, offset, config);
+ default:
+ return -ENOTSUPP;
+ }
+}
+
static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
{
struct gpio_chip *gc;
@@ -485,6 +548,7 @@ static void pca953x_setup_gpio(struct pca953x_chip *chip, int gpios)
gc->set = pca953x_gpio_set_value;
gc->get_direction = pca953x_gpio_get_direction;
gc->set_multiple = pca953x_gpio_set_multiple;
+ gc->set_config = pca953x_gpio_set_config;
gc->can_sleep = true;
gc->base = chip->gpio_start;
@@ -512,6 +576,14 @@ static void pca953x_irq_unmask(struct irq_data *d)
chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
}
+static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = gpiochip_get_data(gc);
+
+ return irq_set_irq_wake(chip->client->irq, on);
+}
+
static void pca953x_irq_bus_lock(struct irq_data *d)
{
struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -587,23 +659,14 @@ static int pca953x_irq_set_type(struct irq_data *d, unsigned int type)
static void pca953x_irq_shutdown(struct irq_data *d)
{
- struct pca953x_chip *chip = irq_data_get_irq_chip_data(d);
+ struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+ struct pca953x_chip *chip = gpiochip_get_data(gc);
u8 mask = 1 << (d->hwirq % BANK_SZ);
chip->irq_trig_raise[d->hwirq / BANK_SZ] &= ~mask;
chip->irq_trig_fall[d->hwirq / BANK_SZ] &= ~mask;
}
-static struct irq_chip pca953x_irq_chip = {
- .name = "pca953x",
- .irq_mask = pca953x_irq_mask,
- .irq_unmask = pca953x_irq_unmask,
- .irq_bus_lock = pca953x_irq_bus_lock,
- .irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock,
- .irq_set_type = pca953x_irq_set_type,
- .irq_shutdown = pca953x_irq_shutdown,
-};
-
static bool pca953x_irq_pending(struct pca953x_chip *chip, u8 *pending)
{
u8 cur_stat[MAX_BANK];
@@ -699,56 +762,65 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
int irq_base)
{
struct i2c_client *client = chip->client;
+ struct irq_chip *irq_chip = &chip->irq_chip;
int reg_direction[MAX_BANK];
int ret, i;
- if (client->irq && irq_base != -1
- && (chip->driver_data & PCA_INT)) {
- ret = pca953x_read_regs(chip,
- chip->regs->input, chip->irq_stat);
- if (ret)
- return ret;
+ if (!client->irq)
+ return 0;
- /*
- * There is no way to know which GPIO line generated the
- * interrupt. We have to rely on the previous read for
- * this purpose.
- */
- regmap_bulk_read(chip->regmap, chip->regs->direction,
- reg_direction, NBANK(chip));
- for (i = 0; i < NBANK(chip); i++)
- chip->irq_stat[i] &= reg_direction[i];
- mutex_init(&chip->irq_lock);
-
- ret = devm_request_threaded_irq(&client->dev,
- client->irq,
- NULL,
- pca953x_irq_handler,
- IRQF_TRIGGER_LOW | IRQF_ONESHOT |
- IRQF_SHARED,
- dev_name(&client->dev), chip);
- if (ret) {
- dev_err(&client->dev, "failed to request irq %d\n",
- client->irq);
- return ret;
- }
+ if (irq_base == -1)
+ return 0;
- ret = gpiochip_irqchip_add_nested(&chip->gpio_chip,
- &pca953x_irq_chip,
- irq_base,
- handle_simple_irq,
- IRQ_TYPE_NONE);
- if (ret) {
- dev_err(&client->dev,
- "could not connect irqchip to gpiochip\n");
- return ret;
- }
+ if (!(chip->driver_data & PCA_INT))
+ return 0;
- gpiochip_set_nested_irqchip(&chip->gpio_chip,
- &pca953x_irq_chip,
- client->irq);
+ ret = pca953x_read_regs(chip, chip->regs->input, chip->irq_stat);
+ if (ret)
+ return ret;
+
+ /*
+ * There is no way to know which GPIO line generated the
+ * interrupt. We have to rely on the previous read for
+ * this purpose.
+ */
+ regmap_bulk_read(chip->regmap, chip->regs->direction, reg_direction,
+ NBANK(chip));
+ for (i = 0; i < NBANK(chip); i++)
+ chip->irq_stat[i] &= reg_direction[i];
+ mutex_init(&chip->irq_lock);
+
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, pca953x_irq_handler,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT |
+ IRQF_SHARED,
+ dev_name(&client->dev), chip);
+ if (ret) {
+ dev_err(&client->dev, "failed to request irq %d\n",
+ client->irq);
+ return ret;
}
+ irq_chip->name = dev_name(&chip->client->dev);
+ irq_chip->irq_mask = pca953x_irq_mask;
+ irq_chip->irq_unmask = pca953x_irq_unmask;
+ irq_chip->irq_set_wake = pca953x_irq_set_wake;
+ irq_chip->irq_bus_lock = pca953x_irq_bus_lock;
+ irq_chip->irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock;
+ irq_chip->irq_set_type = pca953x_irq_set_type;
+ irq_chip->irq_shutdown = pca953x_irq_shutdown;
+
+ ret = gpiochip_irqchip_add_nested(&chip->gpio_chip, irq_chip,
+ irq_base, handle_simple_irq,
+ IRQ_TYPE_NONE);
+ if (ret) {
+ dev_err(&client->dev,
+ "could not connect irqchip to gpiochip\n");
+ return ret;
+ }
+
+ gpiochip_set_nested_irqchip(&chip->gpio_chip, irq_chip, client->irq);
+
return 0;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.