diff options
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-pca953x.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 48a16a3e8ce9..905dc1916883 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -975,6 +975,91 @@ static int pca953x_remove(struct i2c_client *client) return ret; } +#ifdef CONFIG_PM_SLEEP +static int pca953x_regcache_sync(struct device *dev) +{ + struct pca953x_chip *chip = dev_get_drvdata(dev); + int ret; + + /* + * The ordering between direction and output is important, + * sync these registers first and only then sync the rest. + */ + ret = regcache_sync_region(chip->regmap, chip->regs->direction, + chip->regs->direction + NBANK(chip)); + if (ret != 0) { + dev_err(dev, "Failed to sync GPIO dir registers: %d\n", ret); + return ret; + } + + ret = regcache_sync_region(chip->regmap, chip->regs->output, + chip->regs->output + NBANK(chip)); + if (ret != 0) { + dev_err(dev, "Failed to sync GPIO out registers: %d\n", ret); + return ret; + } + +#ifdef CONFIG_GPIO_PCA953X_IRQ + if (chip->driver_data & PCA_PCAL) { + ret = regcache_sync_region(chip->regmap, PCAL953X_IN_LATCH, + PCAL953X_IN_LATCH + NBANK(chip)); + if (ret != 0) { + dev_err(dev, "Failed to sync INT latch registers: %d\n", + ret); + return ret; + } + + ret = regcache_sync_region(chip->regmap, PCAL953X_INT_MASK, + PCAL953X_INT_MASK + NBANK(chip)); + if (ret != 0) { + dev_err(dev, "Failed to sync INT mask registers: %d\n", + ret); + return ret; + } + } +#endif + + return 0; +} + +static int pca953x_suspend(struct device *dev) +{ + struct pca953x_chip *chip = dev_get_drvdata(dev); + + regcache_cache_only(chip->regmap, true); + + regulator_disable(chip->regulator); + + return 0; +} + +static int pca953x_resume(struct device *dev) +{ + struct pca953x_chip *chip = dev_get_drvdata(dev); + int ret; + + ret = regulator_enable(chip->regulator); + if (ret != 0) { + dev_err(dev, "Failed to enable regulator: %d\n", ret); + return 0; + } + + regcache_cache_only(chip->regmap, false); + regcache_mark_dirty(chip->regmap); + ret = pca953x_regcache_sync(dev); + if (ret) + return ret; + + ret = regcache_sync(chip->regmap); + if (ret != 0) { + dev_err(dev, "Failed to restore register map: %d\n", ret); + return ret; + } + + return 0; +} +#endif + /* convenience to stop overlong match-table lines */ #define OF_953X(__nrgpio, __int) (void *)(__nrgpio | PCA953X_TYPE | __int) #define OF_957X(__nrgpio, __int) (void *)(__nrgpio | PCA957X_TYPE | __int) @@ -1018,9 +1103,12 @@ static const struct of_device_id pca953x_dt_ids[] = { MODULE_DEVICE_TABLE(of, pca953x_dt_ids); +static SIMPLE_DEV_PM_OPS(pca953x_pm_ops, pca953x_suspend, pca953x_resume); + static struct i2c_driver pca953x_driver = { .driver = { .name = "pca953x", + .pm = &pca953x_pm_ops, .of_match_table = pca953x_dt_ids, .acpi_match_table = ACPI_PTR(pca953x_acpi_ids), }, |