gpio: mcp23s08 to support both device tree and platform data
Device tree is not enabled in some architecture where gpio driver mcp23s08 is still required. v2-changes: - Parse device tree properties into platform data other than individual variables. v3-changes: - Use of_node in gpio_chip device structure, because the struct device * always has an of_node which is NULL when OF is not used. Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Sonic Zhang
Linus Walleij
parent
59e22114b2
commit
3af0dbd592
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@ -806,7 +806,6 @@ config GPIO_MAX7301
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config GPIO_MCP23S08
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tristate "Microchip MCP23xxx I/O expander"
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depends on OF_GPIO
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depends on (SPI_MASTER && !I2C) || I2C
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help
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SPI/I2C driver for Microchip MCP23S08/MCP23S17/MCP23008/MCP23017
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@ -479,7 +479,7 @@ static int mcp23s08_irq_setup(struct mcp23s08 *mcp)
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mutex_init(&mcp->irq_lock);
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mcp->irq_domain = irq_domain_add_linear(chip->of_node, chip->ngpio,
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mcp->irq_domain = irq_domain_add_linear(chip->dev->of_node, chip->ngpio,
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&irq_domain_simple_ops, mcp);
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if (!mcp->irq_domain)
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return -ENODEV;
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@ -581,7 +581,7 @@ done:
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static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
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void *data, unsigned addr, unsigned type,
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unsigned base, unsigned pullups)
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struct mcp23s08_platform_data *pdata, int cs)
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{
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int status;
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bool mirror = false;
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@ -635,7 +635,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
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return -EINVAL;
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}
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mcp->chip.base = base;
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mcp->chip.base = pdata->base;
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mcp->chip.can_sleep = true;
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mcp->chip.dev = dev;
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mcp->chip.owner = THIS_MODULE;
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@ -648,11 +648,9 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
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if (status < 0)
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goto fail;
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mcp->irq_controller = of_property_read_bool(mcp->chip.of_node,
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"interrupt-controller");
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mcp->irq_controller = pdata->irq_controller;
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if (mcp->irq && mcp->irq_controller && (type == MCP_TYPE_017))
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mirror = of_property_read_bool(mcp->chip.of_node,
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"microchip,irq-mirror");
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mirror = pdata->mirror;
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if ((status & IOCON_SEQOP) || !(status & IOCON_HAEN) || mirror) {
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/* mcp23s17 has IOCON twice, make sure they are in sync */
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@ -668,7 +666,7 @@ static int mcp23s08_probe_one(struct mcp23s08 *mcp, struct device *dev,
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}
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/* configure ~100K pullups */
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status = mcp->ops->write(mcp, MCP_GPPU, pullups);
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status = mcp->ops->write(mcp, MCP_GPPU, pdata->chip[cs].pullups);
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if (status < 0)
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goto fail;
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@ -768,25 +766,29 @@ MODULE_DEVICE_TABLE(of, mcp23s08_i2c_of_match);
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static int mcp230xx_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct mcp23s08_platform_data *pdata;
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struct mcp23s08_platform_data *pdata, local_pdata;
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struct mcp23s08 *mcp;
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int status, base, pullups;
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int status;
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const struct of_device_id *match;
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match = of_match_device(of_match_ptr(mcp23s08_i2c_of_match),
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&client->dev);
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pdata = dev_get_platdata(&client->dev);
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if (match || !pdata) {
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base = -1;
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pullups = 0;
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if (match) {
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pdata = &local_pdata;
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pdata->base = -1;
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pdata->chip[0].pullups = 0;
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pdata->irq_controller = of_property_read_bool(
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client->dev.of_node,
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"interrupt-controller");
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pdata->mirror = of_property_read_bool(client->dev.of_node,
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"microchip,irq-mirror");
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client->irq = irq_of_parse_and_map(client->dev.of_node, 0);
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} else {
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if (!gpio_is_valid(pdata->base)) {
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pdata = dev_get_platdata(&client->dev);
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if (!pdata || !gpio_is_valid(pdata->base)) {
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dev_dbg(&client->dev, "invalid platform data\n");
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return -EINVAL;
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}
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base = pdata->base;
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pullups = pdata->chip[0].pullups;
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}
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mcp = kzalloc(sizeof(*mcp), GFP_KERNEL);
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@ -795,7 +797,7 @@ static int mcp230xx_probe(struct i2c_client *client,
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mcp->irq = client->irq;
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status = mcp23s08_probe_one(mcp, &client->dev, client, client->addr,
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id->driver_data, base, pullups);
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id->driver_data, pdata, 0);
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if (status)
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goto fail;
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@ -863,14 +865,12 @@ static void mcp23s08_i2c_exit(void) { }
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static int mcp23s08_probe(struct spi_device *spi)
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{
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struct mcp23s08_platform_data *pdata;
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struct mcp23s08_platform_data *pdata, local_pdata;
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unsigned addr;
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int chips = 0;
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struct mcp23s08_driver_data *data;
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int status, type;
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unsigned base = -1,
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ngpio = 0,
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pullups[ARRAY_SIZE(pdata->chip)];
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unsigned ngpio = 0;
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const struct of_device_id *match;
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u32 spi_present_mask = 0;
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@ -893,11 +893,18 @@ static int mcp23s08_probe(struct spi_device *spi)
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return -ENODEV;
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}
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pdata = &local_pdata;
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pdata->base = -1;
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for (addr = 0; addr < ARRAY_SIZE(pdata->chip); addr++) {
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pullups[addr] = 0;
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pdata->chip[addr].pullups = 0;
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if (spi_present_mask & (1 << addr))
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chips++;
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}
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pdata->irq_controller = of_property_read_bool(
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spi->dev.of_node,
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"interrupt-controller");
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pdata->mirror = of_property_read_bool(spi->dev.of_node,
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"microchip,irq-mirror");
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} else {
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type = spi_get_device_id(spi)->driver_data;
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pdata = dev_get_platdata(&spi->dev);
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@ -917,10 +924,7 @@ static int mcp23s08_probe(struct spi_device *spi)
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return -EINVAL;
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}
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spi_present_mask |= 1 << addr;
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pullups[addr] = pdata->chip[addr].pullups;
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}
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base = pdata->base;
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}
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if (!chips)
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@ -938,13 +942,13 @@ static int mcp23s08_probe(struct spi_device *spi)
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chips--;
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data->mcp[addr] = &data->chip[chips];
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status = mcp23s08_probe_one(data->mcp[addr], &spi->dev, spi,
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0x40 | (addr << 1), type, base,
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pullups[addr]);
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0x40 | (addr << 1), type, pdata,
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addr);
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if (status < 0)
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goto fail;
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if (base != -1)
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base += (type == MCP_TYPE_S17) ? 16 : 8;
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if (pdata->base != -1)
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pdata->base += (type == MCP_TYPE_S17) ? 16 : 8;
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ngpio += (type == MCP_TYPE_S17) ? 16 : 8;
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}
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data->ngpio = ngpio;
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@ -22,4 +22,22 @@ struct mcp23s08_platform_data {
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* base to base+15 (or base+31 for s17 variant).
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*/
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unsigned base;
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/* Marks the device as a interrupt controller.
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* NOTE: The interrupt functionality is only supported for i2c
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* versions of the chips. The spi chips can also do the interrupts,
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* but this is not supported by the linux driver yet.
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*/
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bool irq_controller;
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/* Sets the mirror flag in the IOCON register. Devices
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* with two interrupt outputs (these are the devices ending with 17 and
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* those that have 16 IOs) have two IO banks: IO 0-7 form bank 1 and
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* IO 8-15 are bank 2. These chips have two different interrupt outputs:
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* One for bank 1 and another for bank 2. If irq-mirror is set, both
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* interrupts are generated regardless of the bank that an input change
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* occurred on. If it is not set, the interrupt are only generated for
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* the bank they belong to.
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* On devices with only one interrupt output this property is useless.
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*/
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bool mirror;
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};
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