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Kernel
提交 3d84fdb3 编写于 作者: S Sebastian Reichel 提交者： Linus Walleij
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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: NSebastian Reichel <sre@kernel.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
上级 38575edc
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drivers/gpio/gpio-mcp23s08.c
浏览文件 @ 3d84fdb3
...@@ -23,6 +23,7 @@ ...@@ -23,6 +23,7 @@
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/of_irq.h> #include <linux/of_irq.h>
#include <linux/of_device.h> #include <linux/of_device.h>
#include <linux/regmap.h>
/** /**
* MCP types supported by driver * MCP types supported by driver
...@@ -58,16 +59,10 @@ ...@@ -58,16 +59,10 @@
struct mcp23s08; 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 { struct mcp23s08 {
u8 addr; u8 addr;
bool irq_active_high; bool irq_active_high;
bool reg_shift;
u16 cache[11]; u16 cache[11];
u16 irq_rise; u16 irq_rise;
...@@ -80,188 +75,126 @@ struct mcp23s08 { ...@@ -80,188 +75,126 @@ struct mcp23s08 {
struct gpio_chip chip; struct gpio_chip chip;
const struct mcp23s08_ops *ops; struct regmap *regmap;
void *data; /* ops specific data */ struct device *dev;
}; };
/* A given spi_device can represent up to eight mcp23sxx chips static const struct regmap_config mcp23x08_regmap = {
* sharing the same chipselect but using different addresses .reg_bits = 8,
* (e.g. chips #0 and #3 might be populated, but not #1 or $2). .val_bits = 8,
* Driver data holds all the per-chip data.
*/
struct mcp23s08_driver_data {
unsigned ngpio;
struct mcp23s08 *mcp[8];
struct mcp23s08 chip[];
};
/*----------------------------------------------------------------------*/
#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) .reg_stride = 1,
{ .max_register = MCP_OLAT,
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,
}; };
static const struct mcp23s08_ops mcp23017_ops = { static const struct regmap_config mcp23x17_regmap = {
.read = mcp23017_read, .reg_bits = 8,
.write = mcp23017_write, .val_bits = 16,
.read_regs = mcp23017_read_regs,
};
#endif /* CONFIG_I2C */ .reg_stride = 2,
.max_register = MCP_OLAT << 1,
.val_format_endian = REGMAP_ENDIAN_LITTLE,
};
/*----------------------------------------------------------------------*/ /*----------------------------------------------------------------------*/
#ifdef CONFIG_SPI_MASTER #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]; struct mcp23s08 *mcp = context;
int status; 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; spi_message_init(&m);
tx[1] = reg; spi_message_add_tail(&t[0], &m);
status = spi_write_then_read(mcp->data, tx, sizeof(tx), rx, sizeof(rx)); spi_message_add_tail(&t[1], &m);
return (status < 0) ? status : rx[0];
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; spi_message_init(&m);
tx[1] = reg; spi_message_add_tail(&t[0], &m);
tx[2] = val; spi_message_add_tail(&t[1], &m);
return spi_write_then_read(mcp->data, tx, sizeof(tx), NULL, 0); spi_message_add_tail(&t[2], &m);
return spi_sync(spi, &m);
} }
static int static int mcp23sxx_spi_read(void *context, const void *reg, size_t reg_size,
mcp23s08_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n) void *val, size_t val_size)
{ {
u8 tx[2], *tmp; struct mcp23s08 *mcp = context;
int status; struct spi_device *spi = to_spi_device(mcp->dev);
u8 tx[2];
if ((n + reg) > sizeof(mcp->cache)) if (reg_size != 1)
return -EINVAL; return -EINVAL;
tx[0] = mcp->addr | 0x01; tx[0] = mcp->addr | 0x01;
tx[1] = reg; tx[1] = *((u8 *) reg);
tmp = (u8 *)vals; return spi_write_then_read(spi, tx, sizeof(tx), val, val_size);
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;
} }
static int mcp23s17_read(struct mcp23s08 *mcp, unsigned reg) static const struct regmap_bus mcp23sxx_spi_regmap = {
{ .write = mcp23sxx_spi_write,
u8 tx[2], rx[2]; .gather_write = mcp23sxx_spi_gather_write,
int status; .read = mcp23sxx_spi_read,
};
tx[0] = mcp->addr | 0x01; #endif /* CONFIG_SPI_MASTER */
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));
}
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]; return regmap_read(mcp->regmap, reg << mcp->reg_shift, val);
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);
} }
static int static int mcp_write(struct mcp23s08 *mcp, unsigned int reg, unsigned int val)
mcp23s17_read_regs(struct mcp23s08 *mcp, unsigned reg, u16 *vals, unsigned n)
{ {
u8 tx[2]; return regmap_write(mcp->regmap, reg << mcp->reg_shift, val);
int status; }
if ((n + reg) > sizeof(mcp->cache)) static int mcp_update_cache(struct mcp23s08 *mcp)
return -EINVAL; {
tx[0] = mcp->addr | 0x01; int ret, reg, i;
tx[1] = reg << 1;
status = spi_write_then_read(mcp->data, tx, sizeof(tx), for (i = 0; i < ARRAY_SIZE(mcp->cache); i++) {
(u8 *)vals, n * 2); ret = mcp_read(mcp, i, &reg);
if (status >= 0) { if (ret < 0)
while (n--) return ret;
vals[n] = __le16_to_cpu((__le16)vals[n]); 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 = { /* A given spi_device can represent up to eight mcp23sxx chips
.read = mcp23s17_read, * sharing the same chipselect but using different addresses
.write = mcp23s17_write, * (e.g. chips #0 and #3 might be populated, but not #1 or $2).
.read_regs = mcp23s17_read_regs, * 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) 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) ...@@ -270,7 +203,7 @@ static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset)
mutex_lock(&mcp->lock); mutex_lock(&mcp->lock);
mcp->cache[MCP_IODIR] |= (1 << offset); 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); mutex_unlock(&mcp->lock);
return status; return status;
} }
...@@ -278,13 +211,13 @@ static int mcp23s08_direction_input(struct gpio_chip *chip, unsigned offset) ...@@ -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) static int mcp23s08_get(struct gpio_chip *chip, unsigned offset)
{ {
struct mcp23s08 *mcp = gpiochip_get_data(chip); struct mcp23s08 *mcp = gpiochip_get_data(chip);
int status; int status, ret;
mutex_lock(&mcp->lock); mutex_lock(&mcp->lock);
/* REVISIT reading this clears any IRQ ... */ /* REVISIT reading this clears any IRQ ... */
status = mcp->ops->read(mcp, MCP_GPIO); ret = mcp_read(mcp, MCP_GPIO, &status);
if (status < 0) if (ret < 0)
status = 0; status = 0;
else { else {
mcp->cache[MCP_GPIO] = status; mcp->cache[MCP_GPIO] = status;
...@@ -303,7 +236,7 @@ static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value) ...@@ -303,7 +236,7 @@ static int __mcp23s08_set(struct mcp23s08 *mcp, unsigned mask, int value)
else else
olat &= ~mask; olat &= ~mask;
mcp->cache[MCP_OLAT] = olat; 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) 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) ...@@ -327,7 +260,7 @@ mcp23s08_direction_output(struct gpio_chip *chip, unsigned offset, int value)
status = __mcp23s08_set(mcp, mask, value); status = __mcp23s08_set(mcp, mask, value);
if (status == 0) { if (status == 0) {
mcp->cache[MCP_IODIR] &= ~mask; 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); mutex_unlock(&mcp->lock);
return status; return status;
...@@ -341,16 +274,14 @@ static irqreturn_t mcp23s08_irq(int irq, void *data) ...@@ -341,16 +274,14 @@ static irqreturn_t mcp23s08_irq(int irq, void *data)
unsigned int child_irq; unsigned int child_irq;
mutex_lock(&mcp->lock); mutex_lock(&mcp->lock);
intf = mcp->ops->read(mcp, MCP_INTF); if (mcp_read(mcp, MCP_INTF, &intf) < 0) {
if (intf < 0) {
mutex_unlock(&mcp->lock); mutex_unlock(&mcp->lock);
return IRQ_HANDLED; return IRQ_HANDLED;
} }
mcp->cache[MCP_INTF] = intf; mcp->cache[MCP_INTF] = intf;
intcap = mcp->ops->read(mcp, MCP_INTCAP); if (mcp_read(mcp, MCP_INTCAP, &intcap) < 0) {
if (intcap < 0) {
mutex_unlock(&mcp->lock); mutex_unlock(&mcp->lock);
return IRQ_HANDLED; return IRQ_HANDLED;
} }
...@@ -435,9 +366,9 @@ static void mcp23s08_irq_bus_unlock(struct irq_data *data) ...@@ -435,9 +366,9 @@ static void mcp23s08_irq_bus_unlock(struct irq_data *data)
struct mcp23s08 *mcp = gpiochip_get_data(gc); struct mcp23s08 *mcp = gpiochip_get_data(gc);
mutex_lock(&mcp->lock); mutex_lock(&mcp->lock);
mcp->ops->write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]); mcp_write(mcp, MCP_GPINTEN, mcp->cache[MCP_GPINTEN]);
mcp->ops->write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]); mcp_write(mcp, MCP_DEFVAL, mcp->cache[MCP_DEFVAL]);
mcp->ops->write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]); mcp_write(mcp, MCP_INTCON, mcp->cache[MCP_INTCON]);
mutex_unlock(&mcp->lock); mutex_unlock(&mcp->lock);
mutex_unlock(&mcp->irq_lock); mutex_unlock(&mcp->irq_lock);
} }
...@@ -514,7 +445,7 @@ static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip) ...@@ -514,7 +445,7 @@ static void mcp23s08_dbg_show(struct seq_file *s, struct gpio_chip *chip)
bank = '0' + ((mcp->addr >> 1) & 0x7); bank = '0' + ((mcp->addr >> 1) & 0x7);
mutex_lock(&mcp->lock); 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) { if (t < 0) {
seq_printf(s, " I/O ERROR %d\n", t); seq_printf(s, " I/O ERROR %d\n", t);
goto done; goto done;
...@@ -549,12 +480,12 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, ...@@ -549,12 +480,12 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
void *data, unsigned addr, unsigned type, void *data, unsigned addr, unsigned type,
struct mcp23s08_platform_data *pdata, int cs) struct mcp23s08_platform_data *pdata, int cs)
{ {
int status; int status, ret;
bool mirror = false; bool mirror = false;
mutex_init(&mcp->lock); mutex_init(&mcp->lock);
mcp->data = data; mcp->dev = dev;
mcp->addr = addr; mcp->addr = addr;
mcp->irq_active_high = false; mcp->irq_active_high = false;
...@@ -571,19 +502,25 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, ...@@ -571,19 +502,25 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
switch (type) { switch (type) {
#ifdef CONFIG_SPI_MASTER #ifdef CONFIG_SPI_MASTER
case MCP_TYPE_S08: 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.ngpio = 8;
mcp->chip.label = "mcp23s08"; mcp->chip.label = "mcp23s08";
break; break;
case MCP_TYPE_S17: 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.ngpio = 16;
mcp->chip.label = "mcp23s17"; mcp->chip.label = "mcp23s17";
break; break;
case MCP_TYPE_S18: 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.ngpio = 16;
mcp->chip.label = "mcp23s18"; mcp->chip.label = "mcp23s18";
break; break;
...@@ -591,13 +528,15 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, ...@@ -591,13 +528,15 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
#if IS_ENABLED(CONFIG_I2C) #if IS_ENABLED(CONFIG_I2C)
case MCP_TYPE_008: 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.ngpio = 8;
mcp->chip.label = "mcp23008"; mcp->chip.label = "mcp23008";
break; break;
case MCP_TYPE_017: 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.ngpio = 16;
mcp->chip.label = "mcp23017"; mcp->chip.label = "mcp23017";
break; break;
...@@ -608,6 +547,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, ...@@ -608,6 +547,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
return -EINVAL; return -EINVAL;
} }
if (IS_ERR(mcp->regmap))
return PTR_ERR(mcp->regmap);
mcp->chip.base = pdata->base; mcp->chip.base = pdata->base;
mcp->chip.can_sleep = true; mcp->chip.can_sleep = true;
mcp->chip.parent = dev; mcp->chip.parent = dev;
...@@ -617,8 +559,8 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *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. * and MCP_IOCON.HAEN = 1, so we work with all chips.
*/ */
status = mcp->ops->read(mcp, MCP_IOCON); ret = mcp_read(mcp, MCP_IOCON, &status);
if (status < 0) if (ret < 0)
goto fail; goto fail;
mcp->irq_controller = pdata->irq_controller; mcp->irq_controller = pdata->irq_controller;
...@@ -646,51 +588,49 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev, ...@@ -646,51 +588,49 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
if (type == MCP_TYPE_S18) if (type == MCP_TYPE_S18)
status |= IOCON_INTCC | (IOCON_INTCC << 8); status |= IOCON_INTCC | (IOCON_INTCC << 8);
status = mcp->ops->write(mcp, MCP_IOCON, status); ret = mcp_write(mcp, MCP_IOCON, status);
if (status < 0) if (ret < 0)
goto fail; goto fail;
} }
/* configure ~100K pullups */ /* configure ~100K pullups */
status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups); ret = mcp_write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
if (status < 0) if (ret < 0)
goto fail; goto fail;
status = mcp->ops->read_regs(mcp, 0, mcp->cache, ARRAY_SIZE(mcp->cache)); ret = mcp_update_cache(mcp);
if (status < 0) if (ret < 0)
goto fail; goto fail;
/* disable inverter on input */ /* disable inverter on input */
if (mcp->cache[MCP_IPOL] != 0) { if (mcp->cache[MCP_IPOL] != 0) {
mcp->cache[MCP_IPOL] = 0; mcp->cache[MCP_IPOL] = 0;
status = mcp->ops->write(mcp, MCP_IPOL, 0); ret = mcp_write(mcp, MCP_IPOL, 0);
if (status < 0) if (ret < 0)
goto fail; goto fail;
} }
/* disable irqs */ /* disable irqs */
if (mcp->cache[MCP_GPINTEN] != 0) { if (mcp->cache[MCP_GPINTEN] != 0) {
mcp->cache[MCP_GPINTEN] = 0; mcp->cache[MCP_GPINTEN] = 0;
status = mcp->ops->write(mcp, MCP_GPINTEN, 0); ret = mcp_write(mcp, MCP_GPINTEN, 0);
if (status < 0) if (ret < 0)
goto fail; goto fail;
} }
status = gpiochip_add_data(&mcp->chip, mcp); ret = gpiochip_add_data(&mcp->chip, mcp);
if (status < 0) if (ret < 0)
goto fail; goto fail;
if (mcp->irq && mcp->irq_controller) { if (mcp->irq && mcp->irq_controller) {
status = mcp23s08_irq_setup(mcp); ret = mcp23s08_irq_setup(mcp);
if (status) { if (ret)
goto fail; goto fail;
} }
}
fail: fail:
if (status < 0) if (ret < 0)
dev_dbg(dev, "can't setup chip %d, --> %d\n", dev_dbg(dev, "can't setup chip %d, --> %d\n", addr, ret);
addr, status); return ret;
return status;
} }
/*----------------------------------------------------------------------*/ /*----------------------------------------------------------------------*/
......
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