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47 lines
1.1 KiB
47 lines
1.1 KiB
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Kernel driver w1-gpio |
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===================== |
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Author: Ville Syrjala <[email protected]> |
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Description |
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----------- |
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GPIO 1-wire bus master driver. The driver uses the GPIO API to control the |
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wire and the GPIO pin can be specified using GPIO machine descriptor tables. |
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It is also possible to define the master using device tree, see |
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Documentation/devicetree/bindings/w1/w1-gpio.txt |
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Example (mach-at91) |
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------------------- |
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:: |
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#include <linux/gpio/machine.h> |
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#include <linux/w1-gpio.h> |
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static struct gpiod_lookup_table foo_w1_gpiod_table = { |
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.dev_id = "w1-gpio", |
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.table = { |
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GPIO_LOOKUP_IDX("at91-gpio", AT91_PIN_PB20, NULL, 0, |
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GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN), |
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}, |
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}; |
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static struct w1_gpio_platform_data foo_w1_gpio_pdata = { |
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.ext_pullup_enable_pin = -EINVAL, |
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}; |
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static struct platform_device foo_w1_device = { |
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.name = "w1-gpio", |
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.id = -1, |
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.dev.platform_data = &foo_w1_gpio_pdata, |
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}; |
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... |
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at91_set_GPIO_periph(foo_w1_gpio_pdata.pin, 1); |
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at91_set_multi_drive(foo_w1_gpio_pdata.pin, 1); |
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gpiod_add_lookup_table(&foo_w1_gpiod_table); |
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platform_device_register(&foo_w1_device);
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