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-rw-r--r--drivers/gpio/Kconfig13
-rw-r--r--drivers/gpio/Makefile2
-rw-r--r--drivers/gpio/max7300.c94
-rw-r--r--drivers/gpio/max7301.c293
-rw-r--r--drivers/gpio/max730x.c244
-rw-r--r--include/linux/spi/max7301.h18
6 files changed, 404 insertions, 260 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 1f1d88ae68d6..f3549b8779d8 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -65,6 +65,9 @@ config GPIO_SYSFS
65 65
66# put expanders in the right section, in alphabetical order 66# put expanders in the right section, in alphabetical order
67 67
68config GPIO_MAX730X
69 tristate
70
68comment "Memory mapped GPIO expanders:" 71comment "Memory mapped GPIO expanders:"
69 72
70config GPIO_PL061 73config GPIO_PL061
@@ -87,6 +90,13 @@ config GPIO_VR41XX
87 90
88comment "I2C GPIO expanders:" 91comment "I2C GPIO expanders:"
89 92
93config GPIO_MAX7300
94 tristate "Maxim MAX7300 GPIO expander"
95 depends on I2C
96 select GPIO_MAX730X
97 help
98 GPIO driver for Maxim MAX7301 I2C-based GPIO expander.
99
90config GPIO_MAX732X 100config GPIO_MAX732X
91 tristate "MAX7319, MAX7320-7327 I2C Port Expanders" 101 tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
92 depends on I2C 102 depends on I2C
@@ -226,8 +236,9 @@ comment "SPI GPIO expanders:"
226config GPIO_MAX7301 236config GPIO_MAX7301
227 tristate "Maxim MAX7301 GPIO expander" 237 tristate "Maxim MAX7301 GPIO expander"
228 depends on SPI_MASTER 238 depends on SPI_MASTER
239 select GPIO_MAX730X
229 help 240 help
230 gpio driver for Maxim MAX7301 SPI GPIO expander. 241 GPIO driver for Maxim MAX7301 SPI-based GPIO expander.
231 242
232config GPIO_MCP23S08 243config GPIO_MCP23S08
233 tristate "Microchip MCP23S08 I/O expander" 244 tristate "Microchip MCP23S08 I/O expander"
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 48687238edb1..508a1b202cdb 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -7,6 +7,8 @@ obj-$(CONFIG_GPIOLIB) += gpiolib.o
7obj-$(CONFIG_GPIO_ADP5520) += adp5520-gpio.o 7obj-$(CONFIG_GPIO_ADP5520) += adp5520-gpio.o
8obj-$(CONFIG_GPIO_ADP5588) += adp5588-gpio.o 8obj-$(CONFIG_GPIO_ADP5588) += adp5588-gpio.o
9obj-$(CONFIG_GPIO_LANGWELL) += langwell_gpio.o 9obj-$(CONFIG_GPIO_LANGWELL) += langwell_gpio.o
10obj-$(CONFIG_GPIO_MAX730X) += max730x.o
11obj-$(CONFIG_GPIO_MAX7300) += max7300.o
10obj-$(CONFIG_GPIO_MAX7301) += max7301.o 12obj-$(CONFIG_GPIO_MAX7301) += max7301.o
11obj-$(CONFIG_GPIO_MAX732X) += max732x.o 13obj-$(CONFIG_GPIO_MAX732X) += max732x.o
12obj-$(CONFIG_GPIO_MC33880) += mc33880.o 14obj-$(CONFIG_GPIO_MC33880) += mc33880.o
diff --git a/drivers/gpio/max7300.c b/drivers/gpio/max7300.c
new file mode 100644
index 000000000000..9d74eef1157a
--- /dev/null
+++ b/drivers/gpio/max7300.c
@@ -0,0 +1,94 @@
1/*
2 * drivers/gpio/max7300.c
3 *
4 * Copyright (C) 2009 Wolfram Sang, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Check max730x.c for further details.
11 */
12
13#include <linux/module.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/mutex.h>
17#include <linux/i2c.h>
18#include <linux/spi/max7301.h>
19
20static int max7300_i2c_write(struct device *dev, unsigned int reg,
21 unsigned int val)
22{
23 struct i2c_client *client = to_i2c_client(dev);
24
25 return i2c_smbus_write_byte_data(client, reg, val);
26}
27
28static int max7300_i2c_read(struct device *dev, unsigned int reg)
29{
30 struct i2c_client *client = to_i2c_client(dev);
31
32 return i2c_smbus_read_byte_data(client, reg);
33}
34
35static int __devinit max7300_probe(struct i2c_client *client,
36 const struct i2c_device_id *id)
37{
38 struct max7301 *ts;
39 int ret;
40
41 if (!i2c_check_functionality(client->adapter,
42 I2C_FUNC_SMBUS_BYTE_DATA))
43 return -EIO;
44
45 ts = kzalloc(sizeof(struct max7301), GFP_KERNEL);
46 if (!ts)
47 return -ENOMEM;
48
49 ts->read = max7300_i2c_read;
50 ts->write = max7300_i2c_write;
51 ts->dev = &client->dev;
52
53 ret = __max730x_probe(ts);
54 if (ret)
55 kfree(ts);
56 return ret;
57}
58
59static int __devexit max7300_remove(struct i2c_client *client)
60{
61 return __max730x_remove(&client->dev);
62}
63
64static const struct i2c_device_id max7300_id[] = {
65 { "max7300", 0 },
66 { }
67};
68MODULE_DEVICE_TABLE(i2c, max7300_id);
69
70static struct i2c_driver max7300_driver = {
71 .driver = {
72 .name = "max7300",
73 .owner = THIS_MODULE,
74 },
75 .probe = max7300_probe,
76 .remove = __devexit_p(max7300_remove),
77 .id_table = max7300_id,
78};
79
80static int __init max7300_init(void)
81{
82 return i2c_add_driver(&max7300_driver);
83}
84subsys_initcall(max7300_init);
85
86static void __exit max7300_exit(void)
87{
88 i2c_del_driver(&max7300_driver);
89}
90module_exit(max7300_exit);
91
92MODULE_AUTHOR("Wolfram Sang");
93MODULE_LICENSE("GPL v2");
94MODULE_DESCRIPTION("MAX7300 GPIO-Expander");
diff --git a/drivers/gpio/max7301.c b/drivers/gpio/max7301.c
index 480956f1ca50..965d9b1ea13e 100644
--- a/drivers/gpio/max7301.c
+++ b/drivers/gpio/max7301.c
@@ -1,98 +1,41 @@
1/** 1/*
2 * drivers/gpio/max7301.c 2 * drivers/gpio/max7301.c
3 * 3 *
4 * Copyright (C) 2006 Juergen Beisert, Pengutronix 4 * Copyright (C) 2006 Juergen Beisert, Pengutronix
5 * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix 5 * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix
6 * Copyright (C) 2009 Wolfram Sang, Pengutronix
6 * 7 *
7 * This program is free software; you can redistribute it and/or modify 8 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as 9 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation. 10 * published by the Free Software Foundation.
10 * 11 *
11 * The Maxim's MAX7301 device is an SPI driven GPIO expander. There are 12 * Check max730x.c for further details.
12 * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more
13 * details
14 * Note:
15 * - DIN must be stable at the rising edge of clock.
16 * - when writing:
17 * - always clock in 16 clocks at once
18 * - at DIN: D15 first, D0 last
19 * - D0..D7 = databyte, D8..D14 = commandbyte
20 * - D15 = low -> write command
21 * - when reading
22 * - always clock in 16 clocks at once
23 * - at DIN: D15 first, D0 last
24 * - D0..D7 = dummy, D8..D14 = register address
25 * - D15 = high -> read command
26 * - raise CS and assert it again
27 * - always clock in 16 clocks at once
28 * - at DOUT: D15 first, D0 last
29 * - D0..D7 contains the data from the first cycle
30 *
31 * The driver exports a standard gpiochip interface
32 */ 13 */
33 14
15#include <linux/module.h>
34#include <linux/init.h> 16#include <linux/init.h>
35#include <linux/platform_device.h> 17#include <linux/platform_device.h>
36#include <linux/mutex.h> 18#include <linux/mutex.h>
37#include <linux/spi/spi.h> 19#include <linux/spi/spi.h>
38#include <linux/spi/max7301.h> 20#include <linux/spi/max7301.h>
39#include <linux/gpio.h>
40
41#define DRIVER_NAME "max7301"
42
43/*
44 * Pin configurations, see MAX7301 datasheet page 6
45 */
46#define PIN_CONFIG_MASK 0x03
47#define PIN_CONFIG_IN_PULLUP 0x03
48#define PIN_CONFIG_IN_WO_PULLUP 0x02
49#define PIN_CONFIG_OUT 0x01
50
51#define PIN_NUMBER 28
52
53
54/*
55 * Some registers must be read back to modify.
56 * To save time we cache them here in memory
57 */
58struct max7301 {
59 struct mutex lock;
60 u8 port_config[8]; /* field 0 is unused */
61 u32 out_level; /* cached output levels */
62 struct gpio_chip chip;
63 struct spi_device *spi;
64};
65 21
66/** 22/* A write to the MAX7301 means one message with one transfer */
67 * max7301_write - Write a new register content 23static int max7301_spi_write(struct device *dev, unsigned int reg,
68 * @spi: The SPI device 24 unsigned int val)
69 * @reg: Register offset
70 * @val: Value to write
71 *
72 * A write to the MAX7301 means one message with one transfer
73 *
74 * Returns 0 if successful or a negative value on error
75 */
76static int max7301_write(struct spi_device *spi, unsigned int reg, unsigned int val)
77{ 25{
26 struct spi_device *spi = to_spi_device(dev);
78 u16 word = ((reg & 0x7F) << 8) | (val & 0xFF); 27 u16 word = ((reg & 0x7F) << 8) | (val & 0xFF);
28
79 return spi_write(spi, (const u8 *)&word, sizeof(word)); 29 return spi_write(spi, (const u8 *)&word, sizeof(word));
80} 30}
81 31
82/** 32/* A read from the MAX7301 means two transfers; here, one message each */
83 * max7301_read - Read back register content 33
84 * @spi: The SPI device 34static int max7301_spi_read(struct device *dev, unsigned int reg)
85 * @reg: Register offset
86 *
87 * A read from the MAX7301 means two transfers; here, one message each
88 *
89 * Returns positive 8 bit value from device if successful or a
90 * negative value on error
91 */
92static int max7301_read(struct spi_device *spi, unsigned int reg)
93{ 35{
94 int ret; 36 int ret;
95 u16 word; 37 u16 word;
38 struct spi_device *spi = to_spi_device(dev);
96 39
97 word = 0x8000 | (reg << 8); 40 word = 0x8000 | (reg << 8);
98 ret = spi_write(spi, (const u8 *)&word, sizeof(word)); 41 ret = spi_write(spi, (const u8 *)&word, sizeof(word));
@@ -108,125 +51,13 @@ static int max7301_read(struct spi_device *spi, unsigned int reg)
108 return word & 0xff; 51 return word & 0xff;
109} 52}
110 53
111static int max7301_direction_input(struct gpio_chip *chip, unsigned offset)
112{
113 struct max7301 *ts = container_of(chip, struct max7301, chip);
114 u8 *config;
115 int ret;
116
117 /* First 4 pins are unused in the controller */
118 offset += 4;
119
120 config = &ts->port_config[offset >> 2];
121
122 mutex_lock(&ts->lock);
123
124 /* Standard GPIO API doesn't support pull-ups, has to be extended.
125 * Hard-coding no pollup for now. */
126 *config = (*config & ~(3 << (offset & 3))) | (1 << (offset & 3));
127
128 ret = max7301_write(ts->spi, 0x08 + (offset >> 2), *config);
129
130 mutex_unlock(&ts->lock);
131
132 return ret;
133}
134
135static int __max7301_set(struct max7301 *ts, unsigned offset, int value)
136{
137 if (value) {
138 ts->out_level |= 1 << offset;
139 return max7301_write(ts->spi, 0x20 + offset, 0x01);
140 } else {
141 ts->out_level &= ~(1 << offset);
142 return max7301_write(ts->spi, 0x20 + offset, 0x00);
143 }
144}
145
146static int max7301_direction_output(struct gpio_chip *chip, unsigned offset,
147 int value)
148{
149 struct max7301 *ts = container_of(chip, struct max7301, chip);
150 u8 *config;
151 int ret;
152
153 /* First 4 pins are unused in the controller */
154 offset += 4;
155
156 config = &ts->port_config[offset >> 2];
157
158 mutex_lock(&ts->lock);
159
160 *config = (*config & ~(3 << (offset & 3))) | (1 << (offset & 3));
161
162 ret = __max7301_set(ts, offset, value);
163
164 if (!ret)
165 ret = max7301_write(ts->spi, 0x08 + (offset >> 2), *config);
166
167 mutex_unlock(&ts->lock);
168
169 return ret;
170}
171
172static int max7301_get(struct gpio_chip *chip, unsigned offset)
173{
174 struct max7301 *ts = container_of(chip, struct max7301, chip);
175 int config, level = -EINVAL;
176
177 /* First 4 pins are unused in the controller */
178 offset += 4;
179
180 mutex_lock(&ts->lock);
181
182 config = (ts->port_config[offset >> 2] >> ((offset & 3) * 2)) & 3;
183
184 switch (config) {
185 case 1:
186 /* Output: return cached level */
187 level = !!(ts->out_level & (1 << offset));
188 break;
189 case 2:
190 case 3:
191 /* Input: read out */
192 level = max7301_read(ts->spi, 0x20 + offset) & 0x01;
193 }
194 mutex_unlock(&ts->lock);
195
196 return level;
197}
198
199static void max7301_set(struct gpio_chip *chip, unsigned offset, int value)
200{
201 struct max7301 *ts = container_of(chip, struct max7301, chip);
202
203 /* First 4 pins are unused in the controller */
204 offset += 4;
205
206 mutex_lock(&ts->lock);
207
208 __max7301_set(ts, offset, value);
209
210 mutex_unlock(&ts->lock);
211}
212
213static int __devinit max7301_probe(struct spi_device *spi) 54static int __devinit max7301_probe(struct spi_device *spi)
214{ 55{
215 struct max7301 *ts; 56 struct max7301 *ts;
216 struct max7301_platform_data *pdata; 57 int ret;
217 int i, ret;
218
219 pdata = spi->dev.platform_data;
220 if (!pdata || !pdata->base) {
221 dev_dbg(&spi->dev, "incorrect or missing platform data\n");
222 return -EINVAL;
223 }
224 58
225 /* 59 /* bits_per_word cannot be configured in platform data */
226 * bits_per_word cannot be configured in platform data
227 */
228 spi->bits_per_word = 16; 60 spi->bits_per_word = 16;
229
230 ret = spi_setup(spi); 61 ret = spi_setup(spi);
231 if (ret < 0) 62 if (ret < 0)
232 return ret; 63 return ret;
@@ -235,90 +66,35 @@ static int __devinit max7301_probe(struct spi_device *spi)
235 if (!ts) 66 if (!ts)
236 return -ENOMEM; 67 return -ENOMEM;
237 68
238 mutex_init(&ts->lock); 69 ts->read = max7301_spi_read;
239 70 ts->write = max7301_spi_write;
240 dev_set_drvdata(&spi->dev, ts); 71 ts->dev = &spi->dev;
241 72
242 /* Power up the chip and disable IRQ output */ 73 ret = __max730x_probe(ts);
243 max7301_write(spi, 0x04, 0x01);
244
245 ts->spi = spi;
246
247 ts->chip.label = DRIVER_NAME,
248
249 ts->chip.direction_input = max7301_direction_input;
250 ts->chip.get = max7301_get;
251 ts->chip.direction_output = max7301_direction_output;
252 ts->chip.set = max7301_set;
253
254 ts->chip.base = pdata->base;
255 ts->chip.ngpio = PIN_NUMBER;
256 ts->chip.can_sleep = 1;
257 ts->chip.dev = &spi->dev;
258 ts->chip.owner = THIS_MODULE;
259
260 /*
261 * tristate all pins in hardware and cache the
262 * register values for later use.
263 */
264 for (i = 1; i < 8; i++) {
265 int j;
266 /* 0xAA means input with internal pullup disabled */
267 max7301_write(spi, 0x08 + i, 0xAA);
268 ts->port_config[i] = 0xAA;
269 for (j = 0; j < 4; j++) {
270 int offset = (i - 1) * 4 + j;
271 ret = max7301_direction_input(&ts->chip, offset);
272 if (ret)
273 goto exit_destroy;
274 }
275 }
276
277 ret = gpiochip_add(&ts->chip);
278 if (ret) 74 if (ret)
279 goto exit_destroy; 75 kfree(ts);
280
281 return ret;
282
283exit_destroy:
284 dev_set_drvdata(&spi->dev, NULL);
285 mutex_destroy(&ts->lock);
286 kfree(ts);
287 return ret; 76 return ret;
288} 77}
289 78
290static int __devexit max7301_remove(struct spi_device *spi) 79static int __devexit max7301_remove(struct spi_device *spi)
291{ 80{
292 struct max7301 *ts; 81 return __max730x_remove(&spi->dev);
293 int ret;
294
295 ts = dev_get_drvdata(&spi->dev);
296 if (ts == NULL)
297 return -ENODEV;
298
299 dev_set_drvdata(&spi->dev, NULL);
300
301 /* Power down the chip and disable IRQ output */
302 max7301_write(spi, 0x04, 0x00);
303
304 ret = gpiochip_remove(&ts->chip);
305 if (!ret) {
306 mutex_destroy(&ts->lock);
307 kfree(ts);
308 } else
309 dev_err(&spi->dev, "Failed to remove the GPIO controller: %d\n",
310 ret);
311
312 return ret;
313} 82}
314 83
84static const struct spi_device_id max7301_id[] = {
85 { "max7301", 0 },
86 { }
87};
88MODULE_DEVICE_TABLE(spi, max7301_id);
89
315static struct spi_driver max7301_driver = { 90static struct spi_driver max7301_driver = {
316 .driver = { 91 .driver = {
317 .name = DRIVER_NAME, 92 .name = "max7301",
318 .owner = THIS_MODULE, 93 .owner = THIS_MODULE,
319 }, 94 },
320 .probe = max7301_probe, 95 .probe = max7301_probe,
321 .remove = __devexit_p(max7301_remove), 96 .remove = __devexit_p(max7301_remove),
97 .id_table = max7301_id,
322}; 98};
323 99
324static int __init max7301_init(void) 100static int __init max7301_init(void)
@@ -336,7 +112,6 @@ static void __exit max7301_exit(void)
336} 112}
337module_exit(max7301_exit); 113module_exit(max7301_exit);
338 114
339MODULE_AUTHOR("Juergen Beisert"); 115MODULE_AUTHOR("Juergen Beisert, Wolfram Sang");
340MODULE_LICENSE("GPL v2"); 116MODULE_LICENSE("GPL v2");
341MODULE_DESCRIPTION("MAX7301 SPI based GPIO-Expander"); 117MODULE_DESCRIPTION("MAX7301 GPIO-Expander");
342MODULE_ALIAS("spi:" DRIVER_NAME);
diff --git a/drivers/gpio/max730x.c b/drivers/gpio/max730x.c
new file mode 100644
index 000000000000..c9bced55f82b
--- /dev/null
+++ b/drivers/gpio/max730x.c
@@ -0,0 +1,244 @@
1/**
2 * drivers/gpio/max7301.c
3 *
4 * Copyright (C) 2006 Juergen Beisert, Pengutronix
5 * Copyright (C) 2008 Guennadi Liakhovetski, Pengutronix
6 * Copyright (C) 2009 Wolfram Sang, Pengutronix
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * The Maxim MAX7300/1 device is an I2C/SPI driven GPIO expander. There are
13 * 28 GPIOs. 8 of them can trigger an interrupt. See datasheet for more
14 * details
15 * Note:
16 * - DIN must be stable at the rising edge of clock.
17 * - when writing:
18 * - always clock in 16 clocks at once
19 * - at DIN: D15 first, D0 last
20 * - D0..D7 = databyte, D8..D14 = commandbyte
21 * - D15 = low -> write command
22 * - when reading
23 * - always clock in 16 clocks at once
24 * - at DIN: D15 first, D0 last
25 * - D0..D7 = dummy, D8..D14 = register address
26 * - D15 = high -> read command
27 * - raise CS and assert it again
28 * - always clock in 16 clocks at once
29 * - at DOUT: D15 first, D0 last
30 * - D0..D7 contains the data from the first cycle
31 *
32 * The driver exports a standard gpiochip interface
33 */
34
35#include <linux/module.h>
36#include <linux/init.h>
37#include <linux/platform_device.h>
38#include <linux/mutex.h>
39#include <linux/spi/max7301.h>
40#include <linux/gpio.h>
41
42/*
43 * Pin configurations, see MAX7301 datasheet page 6
44 */
45#define PIN_CONFIG_MASK 0x03
46#define PIN_CONFIG_IN_PULLUP 0x03
47#define PIN_CONFIG_IN_WO_PULLUP 0x02
48#define PIN_CONFIG_OUT 0x01
49
50#define PIN_NUMBER 28
51
52static int max7301_direction_input(struct gpio_chip *chip, unsigned offset)
53{
54 struct max7301 *ts = container_of(chip, struct max7301, chip);
55 u8 *config;
56 u8 offset_bits;
57 int ret;
58
59 /* First 4 pins are unused in the controller */
60 offset += 4;
61 offset_bits = (offset & 3) << 1;
62
63 config = &ts->port_config[offset >> 2];
64
65 mutex_lock(&ts->lock);
66
67 /* Standard GPIO API doesn't support pull-ups, has to be extended.
68 * Hard-coding no pollup for now. */
69 *config = (*config & ~(PIN_CONFIG_MASK << offset_bits))
70 | (PIN_CONFIG_IN_WO_PULLUP << offset_bits);
71
72 ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);
73
74 mutex_unlock(&ts->lock);
75
76 return ret;
77}
78
79static int __max7301_set(struct max7301 *ts, unsigned offset, int value)
80{
81 if (value) {
82 ts->out_level |= 1 << offset;
83 return ts->write(ts->dev, 0x20 + offset, 0x01);
84 } else {
85 ts->out_level &= ~(1 << offset);
86 return ts->write(ts->dev, 0x20 + offset, 0x00);
87 }
88}
89
90static int max7301_direction_output(struct gpio_chip *chip, unsigned offset,
91 int value)
92{
93 struct max7301 *ts = container_of(chip, struct max7301, chip);
94 u8 *config;
95 u8 offset_bits;
96 int ret;
97
98 /* First 4 pins are unused in the controller */
99 offset += 4;
100 offset_bits = (offset & 3) << 1;
101
102 config = &ts->port_config[offset >> 2];
103
104 mutex_lock(&ts->lock);
105
106 *config = (*config & ~(PIN_CONFIG_MASK << offset_bits))
107 | (PIN_CONFIG_OUT << offset_bits);
108
109 ret = __max7301_set(ts, offset, value);
110
111 if (!ret)
112 ret = ts->write(ts->dev, 0x08 + (offset >> 2), *config);
113
114 mutex_unlock(&ts->lock);
115
116 return ret;
117}
118
119static int max7301_get(struct gpio_chip *chip, unsigned offset)
120{
121 struct max7301 *ts = container_of(chip, struct max7301, chip);
122 int config, level = -EINVAL;
123
124 /* First 4 pins are unused in the controller */
125 offset += 4;
126
127 mutex_lock(&ts->lock);
128
129 config = (ts->port_config[offset >> 2] >> ((offset & 3) << 1))
130 & PIN_CONFIG_MASK;
131
132 switch (config) {
133 case PIN_CONFIG_OUT:
134 /* Output: return cached level */
135 level = !!(ts->out_level & (1 << offset));
136 break;
137 case PIN_CONFIG_IN_WO_PULLUP:
138 case PIN_CONFIG_IN_PULLUP:
139 /* Input: read out */
140 level = ts->read(ts->dev, 0x20 + offset) & 0x01;
141 }
142 mutex_unlock(&ts->lock);
143
144 return level;
145}
146
147static void max7301_set(struct gpio_chip *chip, unsigned offset, int value)
148{
149 struct max7301 *ts = container_of(chip, struct max7301, chip);
150
151 /* First 4 pins are unused in the controller */
152 offset += 4;
153
154 mutex_lock(&ts->lock);
155
156 __max7301_set(ts, offset, value);
157
158 mutex_unlock(&ts->lock);
159}
160
161int __devinit __max730x_probe(struct max7301 *ts)
162{
163 struct device *dev = ts->dev;
164 struct max7301_platform_data *pdata;
165 int i, ret;
166
167 pdata = dev->platform_data;
168 if (!pdata || !pdata->base) {
169 dev_err(dev, "incorrect or missing platform data\n");
170 return -EINVAL;
171 }
172
173 mutex_init(&ts->lock);
174 dev_set_drvdata(dev, ts);
175
176 /* Power up the chip and disable IRQ output */
177 ts->write(dev, 0x04, 0x01);
178
179 ts->chip.label = dev->driver->name;
180
181 ts->chip.direction_input = max7301_direction_input;
182 ts->chip.get = max7301_get;
183 ts->chip.direction_output = max7301_direction_output;
184 ts->chip.set = max7301_set;
185
186 ts->chip.base = pdata->base;
187 ts->chip.ngpio = PIN_NUMBER;
188 ts->chip.can_sleep = 1;
189 ts->chip.dev = dev;
190 ts->chip.owner = THIS_MODULE;
191
192 /*
193 * tristate all pins in hardware and cache the
194 * register values for later use.
195 */
196 for (i = 1; i < 8; i++) {
197 int j;
198 /* 0xAA means input with internal pullup disabled */
199 ts->write(dev, 0x08 + i, 0xAA);
200 ts->port_config[i] = 0xAA;
201 for (j = 0; j < 4; j++) {
202 int offset = (i - 1) * 4 + j;
203 ret = max7301_direction_input(&ts->chip, offset);
204 if (ret)
205 goto exit_destroy;
206 }
207 }
208
209 ret = gpiochip_add(&ts->chip);
210 if (ret)
211 goto exit_destroy;
212
213 return ret;
214
215exit_destroy:
216 dev_set_drvdata(dev, NULL);
217 mutex_destroy(&ts->lock);
218 return ret;
219}
220EXPORT_SYMBOL_GPL(__max730x_probe);
221
222int __devexit __max730x_remove(struct device *dev)
223{
224 struct max7301 *ts = dev_get_drvdata(dev);
225 int ret;
226
227 if (ts == NULL)
228 return -ENODEV;
229
230 dev_set_drvdata(dev, NULL);
231
232 /* Power down the chip and disable IRQ output */
233 ts->write(dev, 0x04, 0x00);
234
235 ret = gpiochip_remove(&ts->chip);
236 if (!ret) {
237 mutex_destroy(&ts->lock);
238 kfree(ts);
239 } else
240 dev_err(dev, "Failed to remove GPIO controller: %d\n", ret);
241
242 return ret;
243}
244EXPORT_SYMBOL_GPL(__max730x_remove);
diff --git a/include/linux/spi/max7301.h b/include/linux/spi/max7301.h
index 6dfd83f19b4b..34af0a3477bf 100644
--- a/include/linux/spi/max7301.h
+++ b/include/linux/spi/max7301.h
@@ -1,9 +1,27 @@
1#ifndef LINUX_SPI_MAX7301_H 1#ifndef LINUX_SPI_MAX7301_H
2#define LINUX_SPI_MAX7301_H 2#define LINUX_SPI_MAX7301_H
3 3
4#include <linux/gpio.h>
5
6/*
7 * Some registers must be read back to modify.
8 * To save time we cache them here in memory
9 */
10struct max7301 {
11 struct mutex lock;
12 u8 port_config[8]; /* field 0 is unused */
13 u32 out_level; /* cached output levels */
14 struct gpio_chip chip;
15 struct device *dev;
16 int (*write)(struct device *dev, unsigned int reg, unsigned int val);
17 int (*read)(struct device *dev, unsigned int reg);
18};
19
4struct max7301_platform_data { 20struct max7301_platform_data {
5 /* number assigned to the first GPIO */ 21 /* number assigned to the first GPIO */
6 unsigned base; 22 unsigned base;
7}; 23};
8 24
25extern int __max730x_remove(struct device *dev);
26extern int __max730x_probe(struct max7301 *ts);
9#endif 27#endif
generated by cgit v1.2.2 (git 2.25.0) at 2026-05-29 23:33:04 -0400