diff options
author | Sebastian Reichel <sre@kernel.org> | 2017-01-27 15:47:37 +0100 |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2017-01-30 15:57:46 +0100 |
commit | 3d84fdb3f0b5367248b403b6d4da11e124eb71fa (patch) | |
tree | cf4d9807e7492a651dce3a7226f99dd52fbaea1d | |
parent | 38575edcabb4012cb79d02ba9e133cb31aad5137 (diff) | |
download | linux-3d84fdb3f0b5367248b403b6d4da11e124eb71fa.tar.bz2 |
gpio: mcp23s08: use regmap
Use regmap API to save some lines of codes and have
debugfs support for all of the MCP's registers.
Signed-off-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r-- | drivers/gpio/gpio-mcp23s08.c | 320 |
1 files changed, 130 insertions, 190 deletions
diff --git a/drivers/gpio/gpio-mcp23s08.c b/drivers/gpio/gpio-mcp23s08.c index 504550665091..bdb692345428 100644 --- a/drivers/gpio/gpio-mcp23s08.c +++ b/drivers/gpio/gpio-mcp23s08.c @@ -23,6 +23,7 @@ #include <linux/interrupt.h> #include <linux/of_irq.h> #include <linux/of_device.h> +#include <linux/regmap.h> /** * MCP types supported by driver @@ -58,16 +59,10 @@ struct mcp23s08; -struct mcp23s08_ops { - int (*read)(struct mcp23s08 *mcp, unsigned reg); - int (*write)(struct mcp23s08 *mcp, unsigned reg, unsigned val); - int (*read_regs)(struct mcp23s08 *mcp, unsigned reg, - u16 *vals, unsigned n); -}; - struct mcp23s08 { u8 addr; bool irq_active_high; + bool reg_shift; u16 cache[11]; u16 irq_rise; @@ -80,188 +75,126 @@ struct mcp23s08 { struct gpio_chip chip; - const struct mcp23s08_ops *ops; - void *data; /* ops specific data */ + struct regmap *regmap; + struct device *dev; }; -/* A given spi_device can represent up to eight mcp23sxx chips - * sharing the same chipselect but using different addresses - * (e.g. chips #0 and #3 might be populated, but not #1 or $2). - * Driver data holds all the per-chip data. - */ -struct mcp23s08_driver_data { - unsigned ngpio; - struct mcp23s08 *mcp[8]; - struct mcp23s08 chip[]; -}; +static const struct regmap_config mcp23x08_regmap = { + .reg_bits = 8, + .val_bits = 8, -/*----------------------------------------------------------------------*/ - -#if IS_ENABLED(CONFIG_I2C) - -static int mcp23008_read(struct mcp23s08 *mcp, unsigned reg) -{ - return i2c_smbus_read_byte_data(mcp->data, reg); -} - -static int mcp23008_write(struct mcp23s08 *mcp, unsigned reg, unsigned val) -{ - return i2c_smbus_write_byte_data(mcp->data, reg, val); -} - -static int -mcp23008_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n) -{ - while (n--) { - int ret = mcp23008_read(mcp, reg++); - if (ret < 0) - return ret; - *vals++ = ret; - } - - return 0; -} - -static int mcp23017_read(struct mcp23s08 *mcp, unsigned reg) -{ - return i2c_smbus_read_word_data(mcp->data, reg << 1); -} - -static int mcp23017_write(struct mcp23s08 *mcp, unsigned reg, unsigned val) -{ - return i2c_smbus_write_word_data(mcp->data, reg << 1, val); -} - -static int -mcp23017_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n) -{ - while (n--) { - int ret = mcp23017_read(mcp, reg++); - if (ret < 0) - return ret; - *vals++ = ret; - } - - return 0; -} - -static const struct mcp23s08_ops mcp23008_ops = { - .read = mcp23008_read, - .write = mcp23008_write, - .read_regs = mcp23008_read_regs, + .reg_stride = 1, + .max_register = MCP_OLAT, }; -static const struct mcp23s08_ops mcp23017_ops = { - .read = mcp23017_read, - .write = mcp23017_write, - .read_regs = mcp23017_read_regs, -}; +static const struct regmap_config mcp23x17_regmap = { + .reg_bits = 8, + .val_bits = 16, -#endif /* CONFIG_I2C */ + .reg_stride = 2, + .max_register = MCP_OLAT << 1, + .val_format_endian = REGMAP_ENDIAN_LITTLE, +}; /*----------------------------------------------------------------------*/ #ifdef CONFIG_SPI_MASTER -static int mcp23s08_read(struct mcp23s08 *mcp, unsigned reg) +static int mcp23sxx_spi_write(void *context, const void *data, size_t count) { - u8 tx[2], rx[1]; - int status; + struct mcp23s08 *mcp = context; + struct spi_device *spi = to_spi_device(mcp->dev); + struct spi_message m; + struct spi_transfer t[2] = { { .tx_buf = &mcp->addr, .len = 1, }, + { .tx_buf = data, .len = count, }, }; - tx[0] = mcp->addr | 0x01; - tx[1] = reg; - status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx)); - return (status < 0) ? status : rx[0]; + spi_message_init(&m); + spi_message_add_tail(&t[0], &m); + spi_message_add_tail(&t[1], &m); + + return spi_sync(spi, &m); } -static int mcp23s08_write(struct mcp23s08 *mcp, unsigned reg, unsigned val) +static int mcp23sxx_spi_gather_write(void *context, + const void *reg, size_t reg_size, + const void *val, size_t val_size) { - u8 tx[3]; + struct mcp23s08 *mcp = context; + struct spi_device *spi = to_spi_device(mcp->dev); + struct spi_message m; + struct spi_transfer t[3] = { { .tx_buf = &mcp->addr, .len = 1, }, + { .tx_buf = reg, .len = reg_size, }, + { .tx_buf = val, .len = val_size, }, }; - tx[0] = mcp->addr; - tx[1] = reg; - tx[2] = val; - return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0); + spi_message_init(&m); + spi_message_add_tail(&t[0], &m); + spi_message_add_tail(&t[1], &m); + spi_message_add_tail(&t[2], &m); + + return spi_sync(spi, &m); } -static int -mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n) +static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size, + void *val, size_t val_size) { - u8 tx[2], *tmp; - int status; + struct mcp23s08 *mcp = context; + struct spi_device *spi = to_spi_device(mcp->dev); + u8 tx[2]; - if ((n + reg) > sizeof(mcp->cache)) + if (reg_size != 1) return -EINVAL; + tx[0] = mcp->addr | 0x01; - tx[1] = reg; + tx[1] = *((u8 *) reg); - tmp = (u8 *)vals; - status = spi_write_then_read(mcp->data, tx, sizeof(tx), tmp, n); - if (status >= 0) { - while (n--) - vals[n] = tmp[n]; /* expand to 16bit */ - } - return status; + return spi_write_then_read(spi, tx, sizeof(tx), val, val_size); } -static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg) -{ - u8 tx[2], rx[2]; - int status; +static const struct regmap_bus mcp23sxx_spi_regmap = { + .write = mcp23sxx_spi_write, + .gather_write = mcp23sxx_spi_gather_write, + .read = mcp23sxx_spi_read, +}; - tx[0] = mcp->addr | 0x01; - tx[1] = reg << 1; - status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx)); - return (status < 0) ? status : (rx[0] | (rx[1] << 8)); -} +#endif /* CONFIG_SPI_MASTER */ -static int mcp23s17_write(struct mcp23s08 *mcp, unsigned reg, unsigned val) +static int mcp_read(struct mcp23s08 *mcp, unsigned int reg, unsigned int *val) { - u8 tx[4]; - - tx[0] = mcp->addr; - tx[1] = reg << 1; - tx[2] = val; - tx[3] = val >> 8; - return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0); + return regmap_read(mcp->regmap, reg << mcp->reg_shift, val); } -static int -mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n) +static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val) { - u8 tx[2]; - int status; + return regmap_write(mcp->regmap, reg << mcp->reg_shift, val); +} - if ((n + reg) > sizeof(mcp->cache)) - return -EINVAL; - tx[0] = mcp->addr | 0x01; - tx[1] = reg << 1; +static int mcp_update_cache(struct mcp23s08 *mcp) +{ + int ret, reg, i; - status = spi_write_then_read(mcp->data, tx, sizeof(tx), - (u8 *)vals, n * 2); - if (status >= 0) { - while (n--) - vals[n] = __le16_to_cpu((__le16)vals[n]); + for (i = 0; i < ARRAY_SIZE(mcp->cache); i++) { + ret = mcp_read(mcp, i, ®); + if (ret < 0) + return ret; + mcp->cache[i] = reg; } - return status; + return 0; } -static const struct mcp23s08_ops mcp23s08_ops = { - .read = mcp23s08_read, - .write = mcp23s08_write, - .read_regs = mcp23s08_read_regs, -}; +/*----------------------------------------------------------------------*/ -static const struct mcp23s08_ops mcp23s17_ops = { - .read = mcp23s17_read, - .write = mcp23s17_write, - .read_regs = mcp23s17_read_regs, +/* A given spi_device can represent up to eight mcp23sxx chips + * sharing the same chipselect but using different addresses + * (e.g. chips #0 and #3 might be populated, but not #1 or $2). + * Driver data holds all the per-chip data. + */ +struct mcp23s08_driver_data { + unsigned ngpio; + struct mcp23s08 *mcp[8]; + struct mcp23s08 chip[]; }; -#endif /* CONFIG_SPI_MASTER */ - -/*----------------------------------------------------------------------*/ static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) { @@ -270,7 +203,7 @@ static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) mutex_lock(&mcp->lock); mcp->cache[MCP_IODIR] |= (1 << offset); - status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]); + status = mcp_write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]); mutex_unlock(&mcp->lock); return status; } @@ -278,13 +211,13 @@ static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) static int mcp23s08_get(struct gpio_chip *chip, unsigned offset) { struct mcp23s08 *mcp = gpiochip_get_data(chip); - int status; + int status, ret; mutex_lock(&mcp->lock); /* REVISIT reading this clears any IRQ ... */ - status = mcp->ops->read(mcp, MCP_GPIO); - if (status < 0) + ret = mcp_read(mcp, MCP_GPIO, &status); + if (ret < 0) status = 0; else { mcp->cache[MCP_GPIO] = status; @@ -303,7 +236,7 @@ static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value) else olat &= ~mask; mcp->cache[MCP_OLAT] = olat; - return mcp->ops->write(mcp, MCP_OLAT, olat); + return mcp_write(mcp, MCP_OLAT, olat); } static void mcp23s08_set(struct gpio_chip *chip, unsigned offset, int value) @@ -327,7 +260,7 @@ mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value) status = __mcp23s08_set(mcp, mask, value); if (status == 0) { mcp->cache[MCP_IODIR] &= ~mask; - status = mcp->ops->write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]); + status = mcp_write(mcp, MCP_IODIR, mcp->cache[MCP_IODIR]); } mutex_unlock(&mcp->lock); return status; @@ -341,16 +274,14 @@ static irqreturn_t mcp23s08_irq(int irq, void *data) unsigned int child_irq; mutex_lock(&mcp->lock); - intf = mcp->ops->read(mcp, MCP_INTF); - if (intf < 0) { + if (mcp_read(mcp, MCP_INTF, &intf) < 0) { mutex_unlock(&mcp->lock); return IRQ_HANDLED; } mcp->cache[MCP_INTF] = intf; - intcap = mcp->ops->read(mcp, MCP_INTCAP); - if (intcap < 0) { + if (mcp_read(mcp, MCP_INTCAP, &intcap) < 0) { mutex_unlock(&mcp->lock); return IRQ_HANDLED; } @@ -435,9 +366,9 @@ static void mcp23s08_irq_bus_unlock(struct irq_data *data) struct mcp23s08 *mcp = gpiochip_get_data(gc); mutex_lock(&mcp->lock); - mcp->ops->write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]); - mcp->ops->write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]); - mcp->ops->write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]); + mcp_write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]); + mcp_write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]); + mcp_write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]); mutex_unlock(&mcp->lock); mutex_unlock(&mcp->irq_lock); } @@ -514,7 +445,7 @@ static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip) bank = '0' + ((mcp->addr >> 1) & 0x7); mutex_lock(&mcp->lock); - t = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache)); + t = mcp_update_cache(mcp); if (t < 0) { seq_printf(s, " I/O ERROR %d\n", t); goto done; @@ -549,12 +480,12 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, void *data, unsigned addr, unsigned type, struct mcp23s08_platform_data *pdata, int cs) { - int status; + int status, ret; bool mirror = false; mutex_init(&mcp->lock); - mcp->data = data; + mcp->dev = dev; mcp->addr = addr; mcp->irq_active_high = false; @@ -571,19 +502,25 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, switch (type) { #ifdef CONFIG_SPI_MASTER case MCP_TYPE_S08: - mcp->ops = &mcp23s08_ops; + mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, + &mcp23x08_regmap); + mcp->reg_shift = 0; mcp->chip.ngpio = 8; mcp->chip.label = "mcp23s08"; break; case MCP_TYPE_S17: - mcp->ops = &mcp23s17_ops; + mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, + &mcp23x17_regmap); + mcp->reg_shift = 1; mcp->chip.ngpio = 16; mcp->chip.label = "mcp23s17"; break; case MCP_TYPE_S18: - mcp->ops = &mcp23s17_ops; + mcp->regmap = devm_regmap_init(dev, &mcp23sxx_spi_regmap, mcp, + &mcp23x17_regmap); + mcp->reg_shift = 1; mcp->chip.ngpio = 16; mcp->chip.label = "mcp23s18"; break; @@ -591,13 +528,15 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, #if IS_ENABLED(CONFIG_I2C) case MCP_TYPE_008: - mcp->ops = &mcp23008_ops; + mcp->regmap = devm_regmap_init_i2c(data, &mcp23x08_regmap); + mcp->reg_shift = 0; mcp->chip.ngpio = 8; mcp->chip.label = "mcp23008"; break; case MCP_TYPE_017: - mcp->ops = &mcp23017_ops; + mcp->regmap = devm_regmap_init_i2c(data, &mcp23x17_regmap); + mcp->reg_shift = 1; mcp->chip.ngpio = 16; mcp->chip.label = "mcp23017"; break; @@ -608,6 +547,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, return -EINVAL; } + if (IS_ERR(mcp->regmap)) + return PTR_ERR(mcp->regmap); + mcp->chip.base = pdata->base; mcp->chip.can_sleep = true; mcp->chip.parent = dev; @@ -617,8 +559,8 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, * and MCP_IOCON.HAEN = 1, so we work with all chips. */ - status = mcp->ops->read(mcp, MCP_IOCON); - if (status < 0) + ret = mcp_read(mcp, MCP_IOCON, &status); + if (ret < 0) goto fail; mcp->irq_controller = pdata->irq_controller; @@ -646,51 +588,49 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, if (type == MCP_TYPE_S18) status |= IOCON_INTCC | (IOCON_INTCC << 8); - status = mcp->ops->write(mcp, MCP_IOCON, status); - if (status < 0) + ret = mcp_write(mcp, MCP_IOCON, status); + if (ret < 0) goto fail; } /* configure ~100K pullups */ - status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups); - if (status < 0) + ret = mcp_write(mcp, MCP_GPPU, pdata->chip[cs].pullups); + if (ret < 0) goto fail; - status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache)); - if (status < 0) + ret = mcp_update_cache(mcp); + if (ret < 0) goto fail; /* disable inverter on input */ if (mcp->cache[MCP_IPOL] != 0) { mcp->cache[MCP_IPOL] = 0; - status = mcp->ops->write(mcp, MCP_IPOL, 0); - if (status < 0) + ret = mcp_write(mcp, MCP_IPOL, 0); + if (ret < 0) goto fail; } /* disable irqs */ if (mcp->cache[MCP_GPINTEN] != 0) { mcp->cache[MCP_GPINTEN] = 0; - status = mcp->ops->write(mcp, MCP_GPINTEN, 0); - if (status < 0) + ret = mcp_write(mcp, MCP_GPINTEN, 0); + if (ret < 0) goto fail; } - status = gpiochip_add_data(&mcp->chip, mcp); - if (status < 0) + ret = gpiochip_add_data(&mcp->chip, mcp); + if (ret < 0) goto fail; if (mcp->irq && mcp->irq_controller) { - status = mcp23s08_irq_setup(mcp); - if (status) { + ret = mcp23s08_irq_setup(mcp); + if (ret) goto fail; - } } fail: - if (status < 0) - dev_dbg(dev, "can't setup chip %d, --> %d\n", - addr, status); - return status; + if (ret < 0) + dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret); + return ret; } /*----------------------------------------------------------------------*/ |