diff options
Diffstat (limited to 'drivers/gpio/gpio-pca953x.c')
| -rw-r--r-- | drivers/gpio/gpio-pca953x.c | 159 |
1 files changed, 151 insertions, 8 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c index 7e66f46b41b2..389fa891f342 100644 --- a/drivers/gpio/gpio-pca953x.c +++ b/drivers/gpio/gpio-pca953x.c @@ -20,6 +20,7 @@ #include <linux/module.h> #include <linux/of_platform.h> #include <linux/platform_data/pca953x.h> +#include <linux/regmap.h> #include <linux/regulator/consumer.h> #include <linux/slab.h> @@ -30,6 +31,8 @@ #define PCA953X_INVERT 0x02 #define PCA953X_DIRECTION 0x03 +#define REG_ADDR_MASK 0x3f +#define REG_ADDR_EXT 0x40 #define REG_ADDR_AI 0x80 #define PCA957X_IN 0x00 @@ -141,6 +144,7 @@ struct pca953x_chip { u8 reg_output[MAX_BANK]; u8 reg_direction[MAX_BANK]; struct mutex i2c_lock; + struct regmap *regmap; #ifdef CONFIG_GPIO_PCA953X_IRQ struct mutex irq_lock; @@ -164,6 +168,141 @@ static int pca953x_bank_shift(struct pca953x_chip *chip) return fls((chip->gpio_chip.ngpio - 1) / BANK_SZ); } +#define PCA953x_BANK_INPUT BIT(0) +#define PCA953x_BANK_OUTPUT BIT(1) +#define PCA953x_BANK_POLARITY BIT(2) +#define PCA953x_BANK_CONFIG BIT(3) + +#define PCA957x_BANK_INPUT BIT(0) +#define PCA957x_BANK_POLARITY BIT(1) +#define PCA957x_BANK_BUSHOLD BIT(2) +#define PCA957x_BANK_CONFIG BIT(4) +#define PCA957x_BANK_OUTPUT BIT(5) + +#define PCAL9xxx_BANK_IN_LATCH BIT(8 + 2) +#define PCAL9xxx_BANK_IRQ_MASK BIT(8 + 5) +#define PCAL9xxx_BANK_IRQ_STAT BIT(8 + 6) + +/* + * We care about the following registers: + * - Standard set, below 0x40, each port can be replicated up to 8 times + * - PCA953x standard + * Input port 0x00 + 0 * bank_size R + * Output port 0x00 + 1 * bank_size RW + * Polarity Inversion port 0x00 + 2 * bank_size RW + * Configuration port 0x00 + 3 * bank_size RW + * - PCA957x with mixed up registers + * Input port 0x00 + 0 * bank_size R + * Polarity Inversion port 0x00 + 1 * bank_size RW + * Bus hold port 0x00 + 2 * bank_size RW + * Configuration port 0x00 + 4 * bank_size RW + * Output port 0x00 + 5 * bank_size RW + * + * - Extended set, above 0x40, often chip specific. + * - PCAL6524/PCAL9555A with custom PCAL IRQ handling: + * Input latch register 0x40 + 2 * bank_size RW + * Interrupt mask register 0x40 + 5 * bank_size RW + * Interrupt status register 0x40 + 6 * bank_size R + * + * - Registers with bit 0x80 set, the AI bit + * The bit is cleared and the registers fall into one of the + * categories above. + */ + +static bool pca953x_check_register(struct pca953x_chip *chip, unsigned int reg, + u32 checkbank) +{ + int bank_shift = pca953x_bank_shift(chip); + int bank = (reg & REG_ADDR_MASK) >> bank_shift; + int offset = reg & (BIT(bank_shift) - 1); + + /* Special PCAL extended register check. */ + if (reg & REG_ADDR_EXT) { + if (!(chip->driver_data & PCA_PCAL)) + return false; + bank += 8; + } + + /* Register is not in the matching bank. */ + if (!(BIT(bank) & checkbank)) + return false; + + /* Register is not within allowed range of bank. */ + if (offset >= NBANK(chip)) + return false; + + return true; +} + +static bool pca953x_readable_register(struct device *dev, unsigned int reg) +{ + struct pca953x_chip *chip = dev_get_drvdata(dev); + u32 bank; + + if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) { + bank = PCA953x_BANK_INPUT | PCA953x_BANK_OUTPUT | + PCA953x_BANK_POLARITY | PCA953x_BANK_CONFIG; + } else { + bank = PCA957x_BANK_INPUT | PCA957x_BANK_OUTPUT | + PCA957x_BANK_POLARITY | PCA957x_BANK_CONFIG | + PCA957x_BANK_BUSHOLD; + } + + if (chip->driver_data & PCA_PCAL) { + bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_IRQ_MASK | + PCAL9xxx_BANK_IRQ_STAT; + } + + return pca953x_check_register(chip, reg, bank); +} + +static bool pca953x_writeable_register(struct device *dev, unsigned int reg) +{ + struct pca953x_chip *chip = dev_get_drvdata(dev); + u32 bank; + + if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) { + bank = PCA953x_BANK_OUTPUT | PCA953x_BANK_POLARITY | + PCA953x_BANK_CONFIG; + } else { + bank = PCA957x_BANK_OUTPUT | PCA957x_BANK_POLARITY | + PCA957x_BANK_CONFIG | PCA957x_BANK_BUSHOLD; + } + + if (chip->driver_data & PCA_PCAL) + bank |= PCAL9xxx_BANK_IN_LATCH | PCAL9xxx_BANK_IRQ_MASK; + + return pca953x_check_register(chip, reg, bank); +} + +static bool pca953x_volatile_register(struct device *dev, unsigned int reg) +{ + struct pca953x_chip *chip = dev_get_drvdata(dev); + u32 bank; + + if (PCA_CHIP_TYPE(chip->driver_data) == PCA953X_TYPE) + bank = PCA953x_BANK_INPUT; + else + bank = PCA957x_BANK_INPUT; + + if (chip->driver_data & PCA_PCAL) + bank |= PCAL9xxx_BANK_IRQ_STAT; + + return pca953x_check_register(chip, reg, bank); +} + +const struct regmap_config pca953x_i2c_regmap = { + .reg_bits = 8, + .val_bits = 8, + + .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, bool write, bool addrinc) { @@ -193,8 +332,7 @@ static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val, u8 regaddr = pca953x_recalc_addr(chip, reg, off, false, false); int ret; - ret = i2c_smbus_read_byte_data(chip->client, regaddr); - *val = ret; + ret = regmap_read(chip->regmap, regaddr, val); if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n"); return ret; @@ -209,7 +347,7 @@ static int pca953x_write_single(struct pca953x_chip *chip, int reg, u32 val, u8 regaddr = pca953x_recalc_addr(chip, reg, off, true, false); int ret; - ret = i2c_smbus_write_byte_data(chip->client, regaddr, val); + ret = regmap_write(chip->regmap, regaddr, val); if (ret < 0) { dev_err(&chip->client->dev, "failed writing register\n"); return ret; @@ -223,8 +361,7 @@ static int pca953x_write_regs(struct pca953x_chip *chip, int reg, u8 *val) u8 regaddr = pca953x_recalc_addr(chip, reg, 0, true, true); int ret; - ret = i2c_smbus_write_i2c_block_data(chip->client, regaddr, - NBANK(chip), val); + ret = regmap_bulk_write(chip->regmap, regaddr, val, NBANK(chip)); if (ret < 0) { dev_err(&chip->client->dev, "failed writing register\n"); return ret; @@ -238,8 +375,7 @@ static int pca953x_read_regs(struct pca953x_chip *chip, int reg, u8 *val) u8 regaddr = pca953x_recalc_addr(chip, reg, 0, false, true); int ret; - ret = i2c_smbus_read_i2c_block_data(chip->client, regaddr, - NBANK(chip), val); + ret = regmap_bulk_read(chip->regmap, regaddr, val, NBANK(chip)); if (ret < 0) { dev_err(&chip->client->dev, "failed reading register\n"); return ret; @@ -793,6 +929,14 @@ static int pca953x_probe(struct i2c_client *client, } } + i2c_set_clientdata(client, chip); + + chip->regmap = devm_regmap_init_i2c(client, &pca953x_i2c_regmap); + if (IS_ERR(chip->regmap)) { + ret = PTR_ERR(chip->regmap); + goto err_exit; + } + mutex_init(&chip->i2c_lock); /* * In case we have an i2c-mux controlled by a GPIO provided by an @@ -843,7 +987,6 @@ static int pca953x_probe(struct i2c_client *client, dev_warn(&client->dev, "setup failed, %d\n", ret); } - i2c_set_clientdata(client, chip); return 0; err_exit: |