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-rw-r--r--drivers/gpio/Kconfig6
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/gpio-arizona.c163
3 files changed, 170 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index c2dfa9f90b47..4002def0b524 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -253,6 +253,12 @@ config GPIO_GE_FPGA
253 253
254comment "I2C GPIO expanders:" 254comment "I2C GPIO expanders:"
255 255
256config GPIO_ARIZONA
257 tristate "Wolfson Microelectronics Arizona class devices"
258 depends on MFD_ARIZONA
259 help
260 Support for GPIOs on Wolfson Arizona class devices.
261
256config GPIO_MAX7300 262config GPIO_MAX7300
257 tristate "Maxim MAX7300 GPIO expander" 263 tristate "Maxim MAX7300 GPIO expander"
258 depends on I2C 264 depends on I2C
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 3a95b17dae86..d37048105a87 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_GPIO_AB8500) += gpio-ab8500.o
13obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o 13obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
14obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o 14obj-$(CONFIG_GPIO_ADP5588) += gpio-adp5588.o
15obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o 15obj-$(CONFIG_GPIO_AMD8111) += gpio-amd8111.o
16obj-$(CONFIG_GPIO_ARIZONA) += gpio-arizona.o
16obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o 17obj-$(CONFIG_GPIO_BT8XX) += gpio-bt8xx.o
17obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o 18obj-$(CONFIG_GPIO_CS5535) += gpio-cs5535.o
18obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o 19obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
diff --git a/drivers/gpio/gpio-arizona.c b/drivers/gpio/gpio-arizona.c
new file mode 100644
index 000000000000..8740d2eb06f8
--- /dev/null
+++ b/drivers/gpio/gpio-arizona.c
@@ -0,0 +1,163 @@
1/*
2 * gpiolib support for Wolfson Arizona class devices
3 *
4 * Copyright 2012 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 */
14
15#include <linux/kernel.h>
16#include <linux/slab.h>
17#include <linux/module.h>
18#include <linux/gpio.h>
19#include <linux/platform_device.h>
20#include <linux/seq_file.h>
21
22#include <linux/mfd/arizona/core.h>
23#include <linux/mfd/arizona/pdata.h>
24#include <linux/mfd/arizona/registers.h>
25
26struct arizona_gpio {
27 struct arizona *arizona;
28 struct gpio_chip gpio_chip;
29};
30
31static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip)
32{
33 return container_of(chip, struct arizona_gpio, gpio_chip);
34}
35
36static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset)
37{
38 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
39 struct arizona *arizona = arizona_gpio->arizona;
40
41 return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
42 ARIZONA_GPN_DIR, ARIZONA_GPN_DIR);
43}
44
45static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset)
46{
47 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
48 struct arizona *arizona = arizona_gpio->arizona;
49 unsigned int val;
50 int ret;
51
52 ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val);
53 if (ret < 0)
54 return ret;
55
56 if (val & ARIZONA_GPN_LVL)
57 return 1;
58 else
59 return 0;
60}
61
62static int arizona_gpio_direction_out(struct gpio_chip *chip,
63 unsigned offset, int value)
64{
65 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
66 struct arizona *arizona = arizona_gpio->arizona;
67
68 if (value)
69 value = ARIZONA_GPN_LVL;
70
71 return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
72 ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value);
73}
74
75static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
76{
77 struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip);
78 struct arizona *arizona = arizona_gpio->arizona;
79
80 if (value)
81 value = ARIZONA_GPN_LVL;
82
83 regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset,
84 ARIZONA_GPN_LVL, value);
85}
86
87static struct gpio_chip template_chip = {
88 .label = "arizona",
89 .owner = THIS_MODULE,
90 .direction_input = arizona_gpio_direction_in,
91 .get = arizona_gpio_get,
92 .direction_output = arizona_gpio_direction_out,
93 .set = arizona_gpio_set,
94 .can_sleep = 1,
95};
96
97static int __devinit arizona_gpio_probe(struct platform_device *pdev)
98{
99 struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
100 struct arizona_pdata *pdata = arizona->dev->platform_data;
101 struct arizona_gpio *arizona_gpio;
102 int ret;
103
104 arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio),
105 GFP_KERNEL);
106 if (arizona_gpio == NULL)
107 return -ENOMEM;
108
109 arizona_gpio->arizona = arizona;
110 arizona_gpio->gpio_chip = template_chip;
111 arizona_gpio->gpio_chip.dev = &pdev->dev;
112
113 switch (arizona->type) {
114 case WM5102:
115 case WM5110:
116 arizona_gpio->gpio_chip.ngpio = 5;
117 break;
118 default:
119 dev_err(&pdev->dev, "Unknown chip variant %d\n",
120 arizona->type);
121 return -EINVAL;
122 }
123
124 if (pdata && pdata->gpio_base)
125 arizona_gpio->gpio_chip.base = pdata->gpio_base;
126 else
127 arizona_gpio->gpio_chip.base = -1;
128
129 ret = gpiochip_add(&arizona_gpio->gpio_chip);
130 if (ret < 0) {
131 dev_err(&pdev->dev, "Could not register gpiochip, %d\n",
132 ret);
133 goto err;
134 }
135
136 platform_set_drvdata(pdev, arizona_gpio);
137
138 return ret;
139
140err:
141 return ret;
142}
143
144static int __devexit arizona_gpio_remove(struct platform_device *pdev)
145{
146 struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev);
147
148 return gpiochip_remove(&arizona_gpio->gpio_chip);
149}
150
151static struct platform_driver arizona_gpio_driver = {
152 .driver.name = "arizona-gpio",
153 .driver.owner = THIS_MODULE,
154 .probe = arizona_gpio_probe,
155 .remove = __devexit_p(arizona_gpio_remove),
156};
157
158module_platform_driver(arizona_gpio_driver);
159
160MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
161MODULE_DESCRIPTION("GPIO interface for Arizona devices");
162MODULE_LICENSE("GPL");
163MODULE_ALIAS("platform:arizona-gpio");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-11 02:39:34 -0500