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Commit | Line | Data |
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80884094 MH |
1 | /* |
2 | * GPIO Chip driver for Analog Devices | |
3 | * ADP5588 I/O Expander and QWERTY Keypad Controller | |
4 | * | |
5 | * Copyright 2009 Analog Devices Inc. | |
6 | * | |
7 | * Licensed under the GPL-2 or later. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/i2c.h> | |
14 | #include <linux/gpio.h> | |
15 | ||
16 | #include <linux/i2c/adp5588.h> | |
17 | ||
18 | #define DRV_NAME "adp5588-gpio" | |
19 | #define MAXGPIO 18 | |
20 | #define ADP_BANK(offs) ((offs) >> 3) | |
21 | #define ADP_BIT(offs) (1u << ((offs) & 0x7)) | |
22 | ||
23 | struct adp5588_gpio { | |
24 | struct i2c_client *client; | |
25 | struct gpio_chip gpio_chip; | |
26 | struct mutex lock; /* protect cached dir, dat_out */ | |
27 | unsigned gpio_start; | |
28 | uint8_t dat_out[3]; | |
29 | uint8_t dir[3]; | |
30 | }; | |
31 | ||
32 | static int adp5588_gpio_read(struct i2c_client *client, u8 reg) | |
33 | { | |
34 | int ret = i2c_smbus_read_byte_data(client, reg); | |
35 | ||
36 | if (ret < 0) | |
37 | dev_err(&client->dev, "Read Error\n"); | |
38 | ||
39 | return ret; | |
40 | } | |
41 | ||
42 | static int adp5588_gpio_write(struct i2c_client *client, u8 reg, u8 val) | |
43 | { | |
44 | int ret = i2c_smbus_write_byte_data(client, reg, val); | |
45 | ||
46 | if (ret < 0) | |
47 | dev_err(&client->dev, "Write Error\n"); | |
48 | ||
49 | return ret; | |
50 | } | |
51 | ||
52 | static int adp5588_gpio_get_value(struct gpio_chip *chip, unsigned off) | |
53 | { | |
54 | struct adp5588_gpio *dev = | |
55 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
56 | ||
57 | return !!(adp5588_gpio_read(dev->client, GPIO_DAT_STAT1 + ADP_BANK(off)) | |
58 | & ADP_BIT(off)); | |
59 | } | |
60 | ||
61 | static void adp5588_gpio_set_value(struct gpio_chip *chip, | |
62 | unsigned off, int val) | |
63 | { | |
64 | unsigned bank, bit; | |
65 | struct adp5588_gpio *dev = | |
66 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
67 | ||
68 | bank = ADP_BANK(off); | |
69 | bit = ADP_BIT(off); | |
70 | ||
71 | mutex_lock(&dev->lock); | |
72 | if (val) | |
73 | dev->dat_out[bank] |= bit; | |
74 | else | |
75 | dev->dat_out[bank] &= ~bit; | |
76 | ||
77 | adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank, | |
78 | dev->dat_out[bank]); | |
79 | mutex_unlock(&dev->lock); | |
80 | } | |
81 | ||
82 | static int adp5588_gpio_direction_input(struct gpio_chip *chip, unsigned off) | |
83 | { | |
84 | int ret; | |
85 | unsigned bank; | |
86 | struct adp5588_gpio *dev = | |
87 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
88 | ||
89 | bank = ADP_BANK(off); | |
90 | ||
91 | mutex_lock(&dev->lock); | |
92 | dev->dir[bank] &= ~ADP_BIT(off); | |
93 | ret = adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, dev->dir[bank]); | |
94 | mutex_unlock(&dev->lock); | |
95 | ||
96 | return ret; | |
97 | } | |
98 | ||
99 | static int adp5588_gpio_direction_output(struct gpio_chip *chip, | |
100 | unsigned off, int val) | |
101 | { | |
102 | int ret; | |
103 | unsigned bank, bit; | |
104 | struct adp5588_gpio *dev = | |
105 | container_of(chip, struct adp5588_gpio, gpio_chip); | |
106 | ||
107 | bank = ADP_BANK(off); | |
108 | bit = ADP_BIT(off); | |
109 | ||
110 | mutex_lock(&dev->lock); | |
111 | dev->dir[bank] |= bit; | |
112 | ||
113 | if (val) | |
114 | dev->dat_out[bank] |= bit; | |
115 | else | |
116 | dev->dat_out[bank] &= ~bit; | |
117 | ||
118 | ret = adp5588_gpio_write(dev->client, GPIO_DAT_OUT1 + bank, | |
119 | dev->dat_out[bank]); | |
120 | ret |= adp5588_gpio_write(dev->client, GPIO_DIR1 + bank, | |
121 | dev->dir[bank]); | |
122 | mutex_unlock(&dev->lock); | |
123 | ||
124 | return ret; | |
125 | } | |
126 | ||
127 | static int __devinit adp5588_gpio_probe(struct i2c_client *client, | |
128 | const struct i2c_device_id *id) | |
129 | { | |
130 | struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; | |
131 | struct adp5588_gpio *dev; | |
132 | struct gpio_chip *gc; | |
133 | int ret, i, revid; | |
134 | ||
135 | if (pdata == NULL) { | |
136 | dev_err(&client->dev, "missing platform data\n"); | |
137 | return -ENODEV; | |
138 | } | |
139 | ||
140 | if (!i2c_check_functionality(client->adapter, | |
141 | I2C_FUNC_SMBUS_BYTE_DATA)) { | |
142 | dev_err(&client->dev, "SMBUS Byte Data not Supported\n"); | |
143 | return -EIO; | |
144 | } | |
145 | ||
146 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
147 | if (dev == NULL) { | |
148 | dev_err(&client->dev, "failed to alloc memory\n"); | |
149 | return -ENOMEM; | |
150 | } | |
151 | ||
152 | dev->client = client; | |
153 | ||
154 | gc = &dev->gpio_chip; | |
155 | gc->direction_input = adp5588_gpio_direction_input; | |
156 | gc->direction_output = adp5588_gpio_direction_output; | |
157 | gc->get = adp5588_gpio_get_value; | |
158 | gc->set = adp5588_gpio_set_value; | |
159 | gc->can_sleep = 1; | |
160 | ||
161 | gc->base = pdata->gpio_start; | |
162 | gc->ngpio = MAXGPIO; | |
163 | gc->label = client->name; | |
164 | gc->owner = THIS_MODULE; | |
165 | ||
166 | mutex_init(&dev->lock); | |
167 | ||
168 | ||
169 | ret = adp5588_gpio_read(dev->client, DEV_ID); | |
170 | if (ret < 0) | |
171 | goto err; | |
172 | ||
173 | revid = ret & ADP5588_DEVICE_ID_MASK; | |
174 | ||
175 | for (i = 0, ret = 0; i <= ADP_BANK(MAXGPIO); i++) { | |
176 | dev->dat_out[i] = adp5588_gpio_read(client, GPIO_DAT_OUT1 + i); | |
177 | dev->dir[i] = adp5588_gpio_read(client, GPIO_DIR1 + i); | |
178 | ret |= adp5588_gpio_write(client, KP_GPIO1 + i, 0); | |
179 | ret |= adp5588_gpio_write(client, GPIO_PULL1 + i, | |
180 | (pdata->pullup_dis_mask >> (8 * i)) & 0xFF); | |
181 | ||
182 | if (ret) | |
183 | goto err; | |
184 | } | |
185 | ||
186 | ret = gpiochip_add(&dev->gpio_chip); | |
187 | if (ret) | |
188 | goto err; | |
189 | ||
190 | dev_info(&client->dev, "gpios %d..%d on a %s Rev. %d\n", | |
191 | gc->base, gc->base + gc->ngpio - 1, | |
192 | client->name, revid); | |
193 | ||
194 | if (pdata->setup) { | |
195 | ret = pdata->setup(client, gc->base, gc->ngpio, pdata->context); | |
196 | if (ret < 0) | |
197 | dev_warn(&client->dev, "setup failed, %d\n", ret); | |
198 | } | |
199 | ||
200 | i2c_set_clientdata(client, dev); | |
201 | return 0; | |
202 | ||
203 | err: | |
204 | kfree(dev); | |
205 | return ret; | |
206 | } | |
207 | ||
208 | static int __devexit adp5588_gpio_remove(struct i2c_client *client) | |
209 | { | |
210 | struct adp5588_gpio_platform_data *pdata = client->dev.platform_data; | |
211 | struct adp5588_gpio *dev = i2c_get_clientdata(client); | |
212 | int ret; | |
213 | ||
214 | if (pdata->teardown) { | |
215 | ret = pdata->teardown(client, | |
216 | dev->gpio_chip.base, dev->gpio_chip.ngpio, | |
217 | pdata->context); | |
218 | if (ret < 0) { | |
219 | dev_err(&client->dev, "teardown failed %d\n", ret); | |
220 | return ret; | |
221 | } | |
222 | } | |
223 | ||
224 | ret = gpiochip_remove(&dev->gpio_chip); | |
225 | if (ret) { | |
226 | dev_err(&client->dev, "gpiochip_remove failed %d\n", ret); | |
227 | return ret; | |
228 | } | |
229 | ||
230 | kfree(dev); | |
231 | return 0; | |
232 | } | |
233 | ||
234 | static const struct i2c_device_id adp5588_gpio_id[] = { | |
235 | {DRV_NAME, 0}, | |
236 | {} | |
237 | }; | |
238 | ||
239 | MODULE_DEVICE_TABLE(i2c, adp5588_gpio_id); | |
240 | ||
241 | static struct i2c_driver adp5588_gpio_driver = { | |
242 | .driver = { | |
243 | .name = DRV_NAME, | |
244 | }, | |
245 | .probe = adp5588_gpio_probe, | |
246 | .remove = __devexit_p(adp5588_gpio_remove), | |
247 | .id_table = adp5588_gpio_id, | |
248 | }; | |
249 | ||
250 | static int __init adp5588_gpio_init(void) | |
251 | { | |
252 | return i2c_add_driver(&adp5588_gpio_driver); | |
253 | } | |
254 | ||
255 | module_init(adp5588_gpio_init); | |
256 | ||
257 | static void __exit adp5588_gpio_exit(void) | |
258 | { | |
259 | i2c_del_driver(&adp5588_gpio_driver); | |
260 | } | |
261 | ||
262 | module_exit(adp5588_gpio_exit); | |
263 | ||
264 | MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); | |
265 | MODULE_DESCRIPTION("GPIO ADP5588 Driver"); | |
266 | MODULE_LICENSE("GPL"); |