printk: fixup declaration of kmsg_reasons
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / mfd / tc35892.c
blobe619e2a55997ebd0ed1ab6f27969da4497a78de9
1 /*
2 * Copyright (C) ST-Ericsson SA 2010
4 * License Terms: GNU General Public License, version 2
5 * Author: Hanumath Prasad <hanumath.prasad@stericsson.com> for ST-Ericsson
6 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
7 */
9 #include <linux/module.h>
10 #include <linux/interrupt.h>
11 #include <linux/irq.h>
12 #include <linux/slab.h>
13 #include <linux/i2c.h>
14 #include <linux/mfd/core.h>
15 #include <linux/mfd/tc35892.h>
17 /**
18 * tc35892_reg_read() - read a single TC35892 register
19 * @tc35892: Device to read from
20 * @reg: Register to read
22 int tc35892_reg_read(struct tc35892 *tc35892, u8 reg)
24 int ret;
26 ret = i2c_smbus_read_byte_data(tc35892->i2c, reg);
27 if (ret < 0)
28 dev_err(tc35892->dev, "failed to read reg %#x: %d\n",
29 reg, ret);
31 return ret;
33 EXPORT_SYMBOL_GPL(tc35892_reg_read);
35 /**
36 * tc35892_reg_read() - write a single TC35892 register
37 * @tc35892: Device to write to
38 * @reg: Register to read
39 * @data: Value to write
41 int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data)
43 int ret;
45 ret = i2c_smbus_write_byte_data(tc35892->i2c, reg, data);
46 if (ret < 0)
47 dev_err(tc35892->dev, "failed to write reg %#x: %d\n",
48 reg, ret);
50 return ret;
52 EXPORT_SYMBOL_GPL(tc35892_reg_write);
54 /**
55 * tc35892_block_read() - read multiple TC35892 registers
56 * @tc35892: Device to read from
57 * @reg: First register
58 * @length: Number of registers
59 * @values: Buffer to write to
61 int tc35892_block_read(struct tc35892 *tc35892, u8 reg, u8 length, u8 *values)
63 int ret;
65 ret = i2c_smbus_read_i2c_block_data(tc35892->i2c, reg, length, values);
66 if (ret < 0)
67 dev_err(tc35892->dev, "failed to read regs %#x: %d\n",
68 reg, ret);
70 return ret;
72 EXPORT_SYMBOL_GPL(tc35892_block_read);
74 /**
75 * tc35892_block_write() - write multiple TC35892 registers
76 * @tc35892: Device to write to
77 * @reg: First register
78 * @length: Number of registers
79 * @values: Values to write
81 int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length,
82 const u8 *values)
84 int ret;
86 ret = i2c_smbus_write_i2c_block_data(tc35892->i2c, reg, length,
87 values);
88 if (ret < 0)
89 dev_err(tc35892->dev, "failed to write regs %#x: %d\n",
90 reg, ret);
92 return ret;
94 EXPORT_SYMBOL_GPL(tc35892_block_write);
96 /**
97 * tc35892_set_bits() - set the value of a bitfield in a TC35892 register
98 * @tc35892: Device to write to
99 * @reg: Register to write
100 * @mask: Mask of bits to set
101 * @values: Value to set
103 int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val)
105 int ret;
107 mutex_lock(&tc35892->lock);
109 ret = tc35892_reg_read(tc35892, reg);
110 if (ret < 0)
111 goto out;
113 ret &= ~mask;
114 ret |= val;
116 ret = tc35892_reg_write(tc35892, reg, ret);
118 out:
119 mutex_unlock(&tc35892->lock);
120 return ret;
122 EXPORT_SYMBOL_GPL(tc35892_set_bits);
124 static struct resource gpio_resources[] = {
126 .start = TC35892_INT_GPIIRQ,
127 .end = TC35892_INT_GPIIRQ,
128 .flags = IORESOURCE_IRQ,
132 static struct mfd_cell tc35892_devs[] = {
134 .name = "tc35892-gpio",
135 .num_resources = ARRAY_SIZE(gpio_resources),
136 .resources = &gpio_resources[0],
140 static irqreturn_t tc35892_irq(int irq, void *data)
142 struct tc35892 *tc35892 = data;
143 int status;
145 status = tc35892_reg_read(tc35892, TC35892_IRQST);
146 if (status < 0)
147 return IRQ_NONE;
149 while (status) {
150 int bit = __ffs(status);
152 handle_nested_irq(tc35892->irq_base + bit);
153 status &= ~(1 << bit);
157 * A dummy read or write (to any register) appears to be necessary to
158 * have the last interrupt clear (for example, GPIO IC write) take
159 * effect.
161 tc35892_reg_read(tc35892, TC35892_IRQST);
163 return IRQ_HANDLED;
166 static void tc35892_irq_dummy(unsigned int irq)
168 /* No mask/unmask at this level */
171 static struct irq_chip tc35892_irq_chip = {
172 .name = "tc35892",
173 .mask = tc35892_irq_dummy,
174 .unmask = tc35892_irq_dummy,
177 static int tc35892_irq_init(struct tc35892 *tc35892)
179 int base = tc35892->irq_base;
180 int irq;
182 for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
183 set_irq_chip_data(irq, tc35892);
184 set_irq_chip_and_handler(irq, &tc35892_irq_chip,
185 handle_edge_irq);
186 set_irq_nested_thread(irq, 1);
187 #ifdef CONFIG_ARM
188 set_irq_flags(irq, IRQF_VALID);
189 #else
190 set_irq_noprobe(irq);
191 #endif
194 return 0;
197 static void tc35892_irq_remove(struct tc35892 *tc35892)
199 int base = tc35892->irq_base;
200 int irq;
202 for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
203 #ifdef CONFIG_ARM
204 set_irq_flags(irq, 0);
205 #endif
206 set_irq_chip_and_handler(irq, NULL, NULL);
207 set_irq_chip_data(irq, NULL);
211 static int tc35892_chip_init(struct tc35892 *tc35892)
213 int manf, ver, ret;
215 manf = tc35892_reg_read(tc35892, TC35892_MANFCODE);
216 if (manf < 0)
217 return manf;
219 ver = tc35892_reg_read(tc35892, TC35892_VERSION);
220 if (ver < 0)
221 return ver;
223 if (manf != TC35892_MANFCODE_MAGIC) {
224 dev_err(tc35892->dev, "unknown manufacturer: %#x\n", manf);
225 return -EINVAL;
228 dev_info(tc35892->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
230 /* Put everything except the IRQ module into reset */
231 ret = tc35892_reg_write(tc35892, TC35892_RSTCTRL,
232 TC35892_RSTCTRL_TIMRST
233 | TC35892_RSTCTRL_ROTRST
234 | TC35892_RSTCTRL_KBDRST
235 | TC35892_RSTCTRL_GPIRST);
236 if (ret < 0)
237 return ret;
239 /* Clear the reset interrupt. */
240 return tc35892_reg_write(tc35892, TC35892_RSTINTCLR, 0x1);
243 static int __devinit tc35892_probe(struct i2c_client *i2c,
244 const struct i2c_device_id *id)
246 struct tc35892_platform_data *pdata = i2c->dev.platform_data;
247 struct tc35892 *tc35892;
248 int ret;
250 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
251 | I2C_FUNC_SMBUS_I2C_BLOCK))
252 return -EIO;
254 tc35892 = kzalloc(sizeof(struct tc35892), GFP_KERNEL);
255 if (!tc35892)
256 return -ENOMEM;
258 mutex_init(&tc35892->lock);
260 tc35892->dev = &i2c->dev;
261 tc35892->i2c = i2c;
262 tc35892->pdata = pdata;
263 tc35892->irq_base = pdata->irq_base;
264 tc35892->num_gpio = id->driver_data;
266 i2c_set_clientdata(i2c, tc35892);
268 ret = tc35892_chip_init(tc35892);
269 if (ret)
270 goto out_free;
272 ret = tc35892_irq_init(tc35892);
273 if (ret)
274 goto out_free;
276 ret = request_threaded_irq(tc35892->i2c->irq, NULL, tc35892_irq,
277 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
278 "tc35892", tc35892);
279 if (ret) {
280 dev_err(tc35892->dev, "failed to request IRQ: %d\n", ret);
281 goto out_removeirq;
284 ret = mfd_add_devices(tc35892->dev, -1, tc35892_devs,
285 ARRAY_SIZE(tc35892_devs), NULL,
286 tc35892->irq_base);
287 if (ret) {
288 dev_err(tc35892->dev, "failed to add children\n");
289 goto out_freeirq;
292 return 0;
294 out_freeirq:
295 free_irq(tc35892->i2c->irq, tc35892);
296 out_removeirq:
297 tc35892_irq_remove(tc35892);
298 out_free:
299 kfree(tc35892);
300 return ret;
303 static int __devexit tc35892_remove(struct i2c_client *client)
305 struct tc35892 *tc35892 = i2c_get_clientdata(client);
307 mfd_remove_devices(tc35892->dev);
309 free_irq(tc35892->i2c->irq, tc35892);
310 tc35892_irq_remove(tc35892);
312 kfree(tc35892);
314 return 0;
317 static const struct i2c_device_id tc35892_id[] = {
318 { "tc35892", 24 },
321 MODULE_DEVICE_TABLE(i2c, tc35892_id);
323 static struct i2c_driver tc35892_driver = {
324 .driver.name = "tc35892",
325 .driver.owner = THIS_MODULE,
326 .probe = tc35892_probe,
327 .remove = __devexit_p(tc35892_remove),
328 .id_table = tc35892_id,
331 static int __init tc35892_init(void)
333 return i2c_add_driver(&tc35892_driver);
335 subsys_initcall(tc35892_init);
337 static void __exit tc35892_exit(void)
339 i2c_del_driver(&tc35892_driver);
341 module_exit(tc35892_exit);
343 MODULE_LICENSE("GPL v2");
344 MODULE_DESCRIPTION("TC35892 MFD core driver");
345 MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");