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David Brownella9c5fff2008-02-04 22:28:17 -08001#
2# GPIO infrastructure and expanders
3#
4
Michael Buesch7444a722008-07-25 01:46:11 -07005config ARCH_WANT_OPTIONAL_GPIOLIB
David Brownella9c5fff2008-02-04 22:28:17 -08006 bool
7 help
Michael Buesch7444a722008-07-25 01:46:11 -07008 Select this config option from the architecture Kconfig, if
9 it is possible to use gpiolib on the architecture, but let the
10 user decide whether to actually build it or not.
11 Select this instead of ARCH_REQUIRE_GPIOLIB, if your architecture does
12 not depend on GPIOs being available, but rather let the user
13 decide whether he needs it or not.
14
15config ARCH_REQUIRE_GPIOLIB
16 bool
17 select GPIOLIB
18 help
David Brownella9c5fff2008-02-04 22:28:17 -080019 Platforms select gpiolib if they use this infrastructure
20 for all their GPIOs, usually starting with ones integrated
21 into SOC processors.
Michael Buesch7444a722008-07-25 01:46:11 -070022 Selecting this from the architecture code will cause the gpiolib
23 code to always get built in.
David Brownella9c5fff2008-02-04 22:28:17 -080024
Michael Buesch7444a722008-07-25 01:46:11 -070025
26
27menuconfig GPIOLIB
28 bool "GPIO Support"
29 depends on ARCH_WANT_OPTIONAL_GPIOLIB || ARCH_REQUIRE_GPIOLIB
30 select GENERIC_GPIO
31 help
32 This enables GPIO support through the generic GPIO library.
33 You only need to enable this, if you also want to enable
34 one or more of the GPIO expansion card drivers below.
35
36 If unsure, say N.
37
38if GPIOLIB
David Brownella9c5fff2008-02-04 22:28:17 -080039
40config DEBUG_GPIO
41 bool "Debug GPIO calls"
42 depends on DEBUG_KERNEL
43 help
44 Say Y here to add some extra checks and diagnostics to GPIO calls.
Matt LaPlante692105b2009-01-26 11:12:25 +010045 These checks help ensure that GPIOs have been properly initialized
46 before they are used, and that sleeping calls are not made from
47 non-sleeping contexts. They can make bitbanged serial protocols
David Brownella9c5fff2008-02-04 22:28:17 -080048 slower. The diagnostics help catch the type of setup errors
49 that are most common when setting up new platforms or boards.
50
David Brownelld8f388d2008-07-25 01:46:07 -070051config GPIO_SYSFS
52 bool "/sys/class/gpio/... (sysfs interface)"
53 depends on SYSFS && EXPERIMENTAL
54 help
55 Say Y here to add a sysfs interface for GPIOs.
56
57 This is mostly useful to work around omissions in a system's
58 kernel support. Those are common in custom and semicustom
59 hardware assembled using standard kernels with a minimum of
60 custom patches. In those cases, userspace code may import
61 a given GPIO from the kernel, if no kernel driver requested it.
62
63 Kernel drivers may also request that a particular GPIO be
64 exported to userspace; this can be useful when debugging.
65
David Brownella9c5fff2008-02-04 22:28:17 -080066# put expanders in the right section, in alphabetical order
67
John Linn0bcb6062008-11-12 13:25:38 -080068comment "Memory mapped GPIO expanders:"
69
70config GPIO_XILINX
71 bool "Xilinx GPIO support"
Michal Simek6fa612b2009-05-11 15:49:12 +020072 depends on PPC_OF || MICROBLAZE
John Linn0bcb6062008-11-12 13:25:38 -080073 help
74 Say yes here to support the Xilinx FPGA GPIO device
75
David Brownella9c5fff2008-02-04 22:28:17 -080076comment "I2C GPIO expanders:"
77
Eric Miaobbcd6d52008-07-25 01:46:14 -070078config GPIO_MAX732X
79 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
80 depends on I2C
81 help
82 Say yes here to support the MAX7319, MAX7320-7327 series of I2C
83 Port Expanders. Each IO port on these chips has a fixed role of
84 Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
85 Input and Output (designed by 'P'). The combinations are listed
86 below:
87
88 8 bits: max7319 (8I), max7320 (8O), max7321 (8P),
89 max7322 (4I4O), max7323 (4P4O)
90
91 16 bits: max7324 (8I8O), max7325 (8P8O),
92 max7326 (4I12O), max7327 (4P12O)
93
94 Board setup code must specify the model to use, and the start
95 number for these GPIOs.
96
Guennadi Liakhovetskif3dc3632008-02-06 01:39:03 -080097config GPIO_PCA953X
David Brownellab5dc372009-01-06 14:42:27 -080098 tristate "PCA953x, PCA955x, TCA64xx, and MAX7310 I/O ports"
eric miao9e60fdc2008-02-04 22:28:26 -080099 depends on I2C
100 help
David Brownell7059d4b2008-07-04 09:59:37 -0700101 Say yes here to provide access to several register-oriented
102 SMBus I/O expanders, made mostly by NXP or TI. Compatible
103 models include:
104
105 4 bits: pca9536, pca9537
106
David Brownellab5dc372009-01-06 14:42:27 -0800107 8 bits: max7310, pca9534, pca9538, pca9554, pca9557,
108 tca6408
David Brownell7059d4b2008-07-04 09:59:37 -0700109
David Brownellab5dc372009-01-06 14:42:27 -0800110 16 bits: pca9535, pca9539, pca9555, tca6416
eric miao9e60fdc2008-02-04 22:28:26 -0800111
112 This driver can also be built as a module. If so, the module
Guennadi Liakhovetskif3dc3632008-02-06 01:39:03 -0800113 will be called pca953x.
eric miao9e60fdc2008-02-04 22:28:26 -0800114
David Brownell15fae372008-02-04 22:28:24 -0800115config GPIO_PCF857X
David Brownell1673ad52008-07-21 14:21:34 -0700116 tristate "PCF857x, PCA{85,96}7x, and MAX732[89] I2C GPIO expanders"
David Brownell15fae372008-02-04 22:28:24 -0800117 depends on I2C
118 help
119 Say yes here to provide access to most "quasi-bidirectional" I2C
120 GPIO expanders used for additional digital outputs or inputs.
121 Most of these parts are from NXP, though TI is a second source for
122 some of them. Compatible models include:
123
124 8 bits: pcf8574, pcf8574a, pca8574, pca8574a,
David Brownell1673ad52008-07-21 14:21:34 -0700125 pca9670, pca9672, pca9674, pca9674a,
126 max7328, max7329
David Brownell15fae372008-02-04 22:28:24 -0800127
128 16 bits: pcf8575, pcf8575c, pca8575,
129 pca9671, pca9673, pca9675
130
131 Your board setup code will need to declare the expanders in
132 use, and assign numbers to the GPIOs they expose. Those GPIOs
133 can then be used from drivers and other kernel code, just like
134 other GPIOs, but only accessible from task contexts.
135
136 This driver provides an in-kernel interface to those GPIOs using
137 platform-neutral GPIO calls.
138
David Brownelle9d359472008-10-20 23:51:46 +0200139config GPIO_TWL4030
140 tristate "TWL4030, TWL5030, and TPS659x0 GPIOs"
141 depends on TWL4030_CORE
142 help
143 Say yes here to access the GPIO signals of various multi-function
144 power management chips from Texas Instruments.
145
Michael Bueschff1d5c22008-07-25 01:46:10 -0700146comment "PCI GPIO expanders:"
147
148config GPIO_BT8XX
149 tristate "BT8XX GPIO abuser"
150 depends on PCI && VIDEO_BT848=n
151 help
152 The BT8xx frame grabber chip has 24 GPIO pins than can be abused
153 as a cheap PCI GPIO card.
154
155 This chip can be found on Miro, Hauppauge and STB TV-cards.
156
157 The card needs to be physically altered for using it as a
158 GPIO card. For more information on how to build a GPIO card
159 from a BT8xx TV card, see the documentation file at
160 Documentation/bt8xxgpio.txt
161
162 If unsure, say N.
163
David Brownella9c5fff2008-02-04 22:28:17 -0800164comment "SPI GPIO expanders:"
165
Juergen Beisert0c36ec32008-07-21 14:21:34 -0700166config GPIO_MAX7301
167 tristate "Maxim MAX7301 GPIO expander"
168 depends on SPI_MASTER
169 help
170 gpio driver for Maxim MAX7301 SPI GPIO expander.
171
David Brownelle58b9e22008-02-04 22:28:25 -0800172config GPIO_MCP23S08
173 tristate "Microchip MCP23S08 I/O expander"
174 depends on SPI_MASTER
175 help
176 SPI driver for Microchip MCP23S08 I/O expander. This provides
177 a GPIO interface supporting inputs and outputs.
178
Michael Buesch7444a722008-07-25 01:46:11 -0700179endif