tc3589x.c (f4e8afdc7ab1b5a0962be02a9dd15d29a81f4c53) tc3589x.c (20406ebff4a298e6e3abbc1717a90bb3e55dc820)
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
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 */
8
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/tc3589x.h>
16
17/**
1/*
2 * Copyright (C) ST-Ericsson SA 2010
3 *
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 */
8
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/tc3589x.h>
16
17/**
18 * tc35892_reg_read() - read a single TC35892 register
19 * @tc35892: Device to read from
18 * tc3589x_reg_read() - read a single TC3589x register
19 * @tc3589x: Device to read from
20 * @reg: Register to read
21 */
20 * @reg: Register to read
21 */
22int tc35892_reg_read(struct tc35892 *tc35892, u8 reg)
22int tc3589x_reg_read(struct tc3589x *tc3589x, u8 reg)
23{
24 int ret;
25
23{
24 int ret;
25
26 ret = i2c_smbus_read_byte_data(tc35892->i2c, reg);
26 ret = i2c_smbus_read_byte_data(tc3589x->i2c, reg);
27 if (ret < 0)
27 if (ret < 0)
28 dev_err(tc35892->dev, "failed to read reg %#x: %d\n",
28 dev_err(tc3589x->dev, "failed to read reg %#x: %d\n",
29 reg, ret);
30
31 return ret;
32}
29 reg, ret);
30
31 return ret;
32}
33EXPORT_SYMBOL_GPL(tc35892_reg_read);
33EXPORT_SYMBOL_GPL(tc3589x_reg_read);
34
35/**
34
35/**
36 * tc35892_reg_read() - write a single TC35892 register
37 * @tc35892: Device to write to
36 * tc3589x_reg_read() - write a single TC3589x register
37 * @tc3589x: Device to write to
38 * @reg: Register to read
39 * @data: Value to write
40 */
38 * @reg: Register to read
39 * @data: Value to write
40 */
41int tc35892_reg_write(struct tc35892 *tc35892, u8 reg, u8 data)
41int tc3589x_reg_write(struct tc3589x *tc3589x, u8 reg, u8 data)
42{
43 int ret;
44
42{
43 int ret;
44
45 ret = i2c_smbus_write_byte_data(tc35892->i2c, reg, data);
45 ret = i2c_smbus_write_byte_data(tc3589x->i2c, reg, data);
46 if (ret < 0)
46 if (ret < 0)
47 dev_err(tc35892->dev, "failed to write reg %#x: %d\n",
47 dev_err(tc3589x->dev, "failed to write reg %#x: %d\n",
48 reg, ret);
49
50 return ret;
51}
48 reg, ret);
49
50 return ret;
51}
52EXPORT_SYMBOL_GPL(tc35892_reg_write);
52EXPORT_SYMBOL_GPL(tc3589x_reg_write);
53
54/**
53
54/**
55 * tc35892_block_read() - read multiple TC35892 registers
56 * @tc35892: Device to read from
55 * tc3589x_block_read() - read multiple TC3589x registers
56 * @tc3589x: Device to read from
57 * @reg: First register
58 * @length: Number of registers
59 * @values: Buffer to write to
60 */
57 * @reg: First register
58 * @length: Number of registers
59 * @values: Buffer to write to
60 */
61int tc35892_block_read(struct tc35892 *tc35892, u8 reg, u8 length, u8 *values)
61int tc3589x_block_read(struct tc3589x *tc3589x, u8 reg, u8 length, u8 *values)
62{
63 int ret;
64
62{
63 int ret;
64
65 ret = i2c_smbus_read_i2c_block_data(tc35892->i2c, reg, length, values);
65 ret = i2c_smbus_read_i2c_block_data(tc3589x->i2c, reg, length, values);
66 if (ret < 0)
66 if (ret < 0)
67 dev_err(tc35892->dev, "failed to read regs %#x: %d\n",
67 dev_err(tc3589x->dev, "failed to read regs %#x: %d\n",
68 reg, ret);
69
70 return ret;
71}
68 reg, ret);
69
70 return ret;
71}
72EXPORT_SYMBOL_GPL(tc35892_block_read);
72EXPORT_SYMBOL_GPL(tc3589x_block_read);
73
74/**
73
74/**
75 * tc35892_block_write() - write multiple TC35892 registers
76 * @tc35892: Device to write to
75 * tc3589x_block_write() - write multiple TC3589x registers
76 * @tc3589x: Device to write to
77 * @reg: First register
78 * @length: Number of registers
79 * @values: Values to write
80 */
77 * @reg: First register
78 * @length: Number of registers
79 * @values: Values to write
80 */
81int tc35892_block_write(struct tc35892 *tc35892, u8 reg, u8 length,
81int tc3589x_block_write(struct tc3589x *tc3589x, u8 reg, u8 length,
82 const u8 *values)
83{
84 int ret;
85
82 const u8 *values)
83{
84 int ret;
85
86 ret = i2c_smbus_write_i2c_block_data(tc35892->i2c, reg, length,
86 ret = i2c_smbus_write_i2c_block_data(tc3589x->i2c, reg, length,
87 values);
88 if (ret < 0)
87 values);
88 if (ret < 0)
89 dev_err(tc35892->dev, "failed to write regs %#x: %d\n",
89 dev_err(tc3589x->dev, "failed to write regs %#x: %d\n",
90 reg, ret);
91
92 return ret;
93}
90 reg, ret);
91
92 return ret;
93}
94EXPORT_SYMBOL_GPL(tc35892_block_write);
94EXPORT_SYMBOL_GPL(tc3589x_block_write);
95
96/**
95
96/**
97 * tc35892_set_bits() - set the value of a bitfield in a TC35892 register
98 * @tc35892: Device to write to
97 * tc3589x_set_bits() - set the value of a bitfield in a TC3589x register
98 * @tc3589x: Device to write to
99 * @reg: Register to write
100 * @mask: Mask of bits to set
101 * @values: Value to set
102 */
99 * @reg: Register to write
100 * @mask: Mask of bits to set
101 * @values: Value to set
102 */
103int tc35892_set_bits(struct tc35892 *tc35892, u8 reg, u8 mask, u8 val)
103int tc3589x_set_bits(struct tc3589x *tc3589x, u8 reg, u8 mask, u8 val)
104{
105 int ret;
106
104{
105 int ret;
106
107 mutex_lock(&tc35892->lock);
107 mutex_lock(&tc3589x->lock);
108
108
109 ret = tc35892_reg_read(tc35892, reg);
109 ret = tc3589x_reg_read(tc3589x, reg);
110 if (ret < 0)
111 goto out;
112
113 ret &= ~mask;
114 ret |= val;
115
110 if (ret < 0)
111 goto out;
112
113 ret &= ~mask;
114 ret |= val;
115
116 ret = tc35892_reg_write(tc35892, reg, ret);
116 ret = tc3589x_reg_write(tc3589x, reg, ret);
117
118out:
117
118out:
119 mutex_unlock(&tc35892->lock);
119 mutex_unlock(&tc3589x->lock);
120 return ret;
121}
120 return ret;
121}
122EXPORT_SYMBOL_GPL(tc35892_set_bits);
122EXPORT_SYMBOL_GPL(tc3589x_set_bits);
123
124static struct resource gpio_resources[] = {
125 {
123
124static struct resource gpio_resources[] = {
125 {
126 .start = TC35892_INT_GPIIRQ,
127 .end = TC35892_INT_GPIIRQ,
126 .start = TC3589x_INT_GPIIRQ,
127 .end = TC3589x_INT_GPIIRQ,
128 .flags = IORESOURCE_IRQ,
129 },
130};
131
128 .flags = IORESOURCE_IRQ,
129 },
130};
131
132static struct mfd_cell tc35892_devs[] = {
132static struct mfd_cell tc3589x_devs[] = {
133 {
133 {
134 .name = "tc35892-gpio",
134 .name = "tc3589x-gpio",
135 .num_resources = ARRAY_SIZE(gpio_resources),
136 .resources = &gpio_resources[0],
137 },
138};
139
135 .num_resources = ARRAY_SIZE(gpio_resources),
136 .resources = &gpio_resources[0],
137 },
138};
139
140static irqreturn_t tc35892_irq(int irq, void *data)
140static irqreturn_t tc3589x_irq(int irq, void *data)
141{
141{
142 struct tc35892 *tc35892 = data;
142 struct tc3589x *tc3589x = data;
143 int status;
144
143 int status;
144
145 status = tc35892_reg_read(tc35892, TC35892_IRQST);
145 status = tc3589x_reg_read(tc3589x, TC3589x_IRQST);
146 if (status < 0)
147 return IRQ_NONE;
148
149 while (status) {
150 int bit = __ffs(status);
151
146 if (status < 0)
147 return IRQ_NONE;
148
149 while (status) {
150 int bit = __ffs(status);
151
152 handle_nested_irq(tc35892->irq_base + bit);
152 handle_nested_irq(tc3589x->irq_base + bit);
153 status &= ~(1 << bit);
154 }
155
156 /*
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.
160 */
153 status &= ~(1 << bit);
154 }
155
156 /*
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.
160 */
161 tc35892_reg_read(tc35892, TC35892_IRQST);
161 tc3589x_reg_read(tc3589x, TC3589x_IRQST);
162
163 return IRQ_HANDLED;
164}
165
162
163 return IRQ_HANDLED;
164}
165
166static void tc35892_irq_dummy(unsigned int irq)
166static void tc3589x_irq_dummy(unsigned int irq)
167{
168 /* No mask/unmask at this level */
169}
170
167{
168 /* No mask/unmask at this level */
169}
170
171static struct irq_chip tc35892_irq_chip = {
172 .name = "tc35892",
173 .mask = tc35892_irq_dummy,
174 .unmask = tc35892_irq_dummy,
171static struct irq_chip tc3589x_irq_chip = {
172 .name = "tc3589x",
173 .mask = tc3589x_irq_dummy,
174 .unmask = tc3589x_irq_dummy,
175};
176
175};
176
177static int tc35892_irq_init(struct tc35892 *tc35892)
177static int tc3589x_irq_init(struct tc3589x *tc3589x)
178{
178{
179 int base = tc35892->irq_base;
179 int base = tc3589x->irq_base;
180 int irq;
181
180 int irq;
181
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,
182 for (irq = base; irq < base + TC3589x_NR_INTERNAL_IRQS; irq++) {
183 set_irq_chip_data(irq, tc3589x);
184 set_irq_chip_and_handler(irq, &tc3589x_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
192 }
193
194 return 0;
195}
196
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
192 }
193
194 return 0;
195}
196
197static void tc35892_irq_remove(struct tc35892 *tc35892)
197static void tc3589x_irq_remove(struct tc3589x *tc3589x)
198{
198{
199 int base = tc35892->irq_base;
199 int base = tc3589x->irq_base;
200 int irq;
201
200 int irq;
201
202 for (irq = base; irq < base + TC35892_NR_INTERNAL_IRQS; irq++) {
202 for (irq = base; irq < base + TC3589x_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);
208 }
209}
210
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);
208 }
209}
210
211static int tc35892_chip_init(struct tc35892 *tc35892)
211static int tc3589x_chip_init(struct tc3589x *tc3589x)
212{
213 int manf, ver, ret;
214
212{
213 int manf, ver, ret;
214
215 manf = tc35892_reg_read(tc35892, TC35892_MANFCODE);
215 manf = tc3589x_reg_read(tc3589x, TC3589x_MANFCODE);
216 if (manf < 0)
217 return manf;
218
216 if (manf < 0)
217 return manf;
218
219 ver = tc35892_reg_read(tc35892, TC35892_VERSION);
219 ver = tc3589x_reg_read(tc3589x, TC3589x_VERSION);
220 if (ver < 0)
221 return ver;
222
220 if (ver < 0)
221 return ver;
222
223 if (manf != TC35892_MANFCODE_MAGIC) {
224 dev_err(tc35892->dev, "unknown manufacturer: %#x\n", manf);
223 if (manf != TC3589x_MANFCODE_MAGIC) {
224 dev_err(tc3589x->dev, "unknown manufacturer: %#x\n", manf);
225 return -EINVAL;
226 }
227
225 return -EINVAL;
226 }
227
228 dev_info(tc35892->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
228 dev_info(tc3589x->dev, "manufacturer: %#x, version: %#x\n", manf, ver);
229
230 /* Put everything except the IRQ module into reset */
229
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);
231 ret = tc3589x_reg_write(tc3589x, TC3589x_RSTCTRL,
232 TC3589x_RSTCTRL_TIMRST
233 | TC3589x_RSTCTRL_ROTRST
234 | TC3589x_RSTCTRL_KBDRST
235 | TC3589x_RSTCTRL_GPIRST);
236 if (ret < 0)
237 return ret;
238
239 /* Clear the reset interrupt. */
236 if (ret < 0)
237 return ret;
238
239 /* Clear the reset interrupt. */
240 return tc35892_reg_write(tc35892, TC35892_RSTINTCLR, 0x1);
240 return tc3589x_reg_write(tc3589x, TC3589x_RSTINTCLR, 0x1);
241}
242
241}
242
243static int __devinit tc35892_probe(struct i2c_client *i2c,
243static int __devinit tc3589x_probe(struct i2c_client *i2c,
244 const struct i2c_device_id *id)
245{
244 const struct i2c_device_id *id)
245{
246 struct tc35892_platform_data *pdata = i2c->dev.platform_data;
247 struct tc35892 *tc35892;
246 struct tc3589x_platform_data *pdata = i2c->dev.platform_data;
247 struct tc3589x *tc3589x;
248 int ret;
249
250 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
251 | I2C_FUNC_SMBUS_I2C_BLOCK))
252 return -EIO;
253
248 int ret;
249
250 if (!i2c_check_functionality(i2c->adapter, I2C_FUNC_SMBUS_BYTE_DATA
251 | I2C_FUNC_SMBUS_I2C_BLOCK))
252 return -EIO;
253
254 tc35892 = kzalloc(sizeof(struct tc35892), GFP_KERNEL);
255 if (!tc35892)
254 tc3589x = kzalloc(sizeof(struct tc3589x), GFP_KERNEL);
255 if (!tc3589x)
256 return -ENOMEM;
257
256 return -ENOMEM;
257
258 mutex_init(&tc35892->lock);
258 mutex_init(&tc3589x->lock);
259
259
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;
260 tc3589x->dev = &i2c->dev;
261 tc3589x->i2c = i2c;
262 tc3589x->pdata = pdata;
263 tc3589x->irq_base = pdata->irq_base;
264 tc3589x->num_gpio = id->driver_data;
265
265
266 i2c_set_clientdata(i2c, tc35892);
266 i2c_set_clientdata(i2c, tc3589x);
267
267
268 ret = tc35892_chip_init(tc35892);
268 ret = tc3589x_chip_init(tc3589x);
269 if (ret)
270 goto out_free;
271
269 if (ret)
270 goto out_free;
271
272 ret = tc35892_irq_init(tc35892);
272 ret = tc3589x_irq_init(tc3589x);
273 if (ret)
274 goto out_free;
275
273 if (ret)
274 goto out_free;
275
276 ret = request_threaded_irq(tc35892->i2c->irq, NULL, tc35892_irq,
276 ret = request_threaded_irq(tc3589x->i2c->irq, NULL, tc3589x_irq,
277 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
277 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
278 "tc35892", tc35892);
278 "tc3589x", tc3589x);
279 if (ret) {
279 if (ret) {
280 dev_err(tc35892->dev, "failed to request IRQ: %d\n", ret);
280 dev_err(tc3589x->dev, "failed to request IRQ: %d\n", ret);
281 goto out_removeirq;
282 }
283
281 goto out_removeirq;
282 }
283
284 ret = mfd_add_devices(tc35892->dev, -1, tc35892_devs,
285 ARRAY_SIZE(tc35892_devs), NULL,
286 tc35892->irq_base);
284 ret = mfd_add_devices(tc3589x->dev, -1, tc3589x_devs,
285 ARRAY_SIZE(tc3589x_devs), NULL,
286 tc3589x->irq_base);
287 if (ret) {
287 if (ret) {
288 dev_err(tc35892->dev, "failed to add children\n");
288 dev_err(tc3589x->dev, "failed to add children\n");
289 goto out_freeirq;
290 }
291
292 return 0;
293
294out_freeirq:
289 goto out_freeirq;
290 }
291
292 return 0;
293
294out_freeirq:
295 free_irq(tc35892->i2c->irq, tc35892);
295 free_irq(tc3589x->i2c->irq, tc3589x);
296out_removeirq:
296out_removeirq:
297 tc35892_irq_remove(tc35892);
297 tc3589x_irq_remove(tc3589x);
298out_free:
298out_free:
299 kfree(tc35892);
299 kfree(tc3589x);
300 return ret;
301}
302
300 return ret;
301}
302
303static int __devexit tc35892_remove(struct i2c_client *client)
303static int __devexit tc3589x_remove(struct i2c_client *client)
304{
304{
305 struct tc35892 *tc35892 = i2c_get_clientdata(client);
305 struct tc3589x *tc3589x = i2c_get_clientdata(client);
306
306
307 mfd_remove_devices(tc35892->dev);
307 mfd_remove_devices(tc3589x->dev);
308
308
309 free_irq(tc35892->i2c->irq, tc35892);
310 tc35892_irq_remove(tc35892);
309 free_irq(tc3589x->i2c->irq, tc3589x);
310 tc3589x_irq_remove(tc3589x);
311
311
312 kfree(tc35892);
312 kfree(tc3589x);
313
314 return 0;
315}
316
313
314 return 0;
315}
316
317static const struct i2c_device_id tc35892_id[] = {
318 { "tc35892", 24 },
317static const struct i2c_device_id tc3589x_id[] = {
318 { "tc3589x", 24 },
319 { }
320};
319 { }
320};
321MODULE_DEVICE_TABLE(i2c, tc35892_id);
321MODULE_DEVICE_TABLE(i2c, tc3589x_id);
322
322
323static struct i2c_driver tc35892_driver = {
324 .driver.name = "tc35892",
323static struct i2c_driver tc3589x_driver = {
324 .driver.name = "tc3589x",
325 .driver.owner = THIS_MODULE,
325 .driver.owner = THIS_MODULE,
326 .probe = tc35892_probe,
327 .remove = __devexit_p(tc35892_remove),
328 .id_table = tc35892_id,
326 .probe = tc3589x_probe,
327 .remove = __devexit_p(tc3589x_remove),
328 .id_table = tc3589x_id,
329};
330
329};
330
331static int __init tc35892_init(void)
331static int __init tc3589x_init(void)
332{
332{
333 return i2c_add_driver(&tc35892_driver);
333 return i2c_add_driver(&tc3589x_driver);
334}
334}
335subsys_initcall(tc35892_init);
335subsys_initcall(tc3589x_init);
336
336
337static void __exit tc35892_exit(void)
337static void __exit tc3589x_exit(void)
338{
338{
339 i2c_del_driver(&tc35892_driver);
339 i2c_del_driver(&tc3589x_driver);
340}
340}
341module_exit(tc35892_exit);
341module_exit(tc3589x_exit);
342
343MODULE_LICENSE("GPL v2");
342
343MODULE_LICENSE("GPL v2");
344MODULE_DESCRIPTION("TC35892 MFD core driver");
344MODULE_DESCRIPTION("TC3589x MFD core driver");
345MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");
345MODULE_AUTHOR("Hanumath Prasad, Rabin Vincent");