Root/drivers/mfd/tps65090.c

1/*
2 * Core driver for TI TPS65090 PMIC family
3 *
4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
5
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
9
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * more details.
14
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19#include <linux/interrupt.h>
20#include <linux/irq.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/mutex.h>
24#include <linux/slab.h>
25#include <linux/i2c.h>
26#include <linux/mfd/core.h>
27#include <linux/mfd/tps65090.h>
28#include <linux/regmap.h>
29#include <linux/err.h>
30
31#define NUM_INT_REG 2
32#define TOTAL_NUM_REG 0x18
33
34/* interrupt status registers */
35#define TPS65090_INT_STS 0x0
36#define TPS65090_INT_STS2 0x1
37
38/* interrupt mask registers */
39#define TPS65090_INT_MSK 0x2
40#define TPS65090_INT_MSK2 0x3
41
42struct tps65090_irq_data {
43    u8 mask_reg;
44    u8 mask_pos;
45};
46
47#define TPS65090_IRQ(_reg, _mask_pos) \
48    { \
49        .mask_reg = (_reg), \
50        .mask_pos = (_mask_pos), \
51    }
52
53static const struct tps65090_irq_data tps65090_irqs[] = {
54    [0] = TPS65090_IRQ(0, 0),
55    [1] = TPS65090_IRQ(0, 1),
56    [2] = TPS65090_IRQ(0, 2),
57    [3] = TPS65090_IRQ(0, 3),
58    [4] = TPS65090_IRQ(0, 4),
59    [5] = TPS65090_IRQ(0, 5),
60    [6] = TPS65090_IRQ(0, 6),
61    [7] = TPS65090_IRQ(0, 7),
62    [8] = TPS65090_IRQ(1, 0),
63    [9] = TPS65090_IRQ(1, 1),
64    [10] = TPS65090_IRQ(1, 2),
65    [11] = TPS65090_IRQ(1, 3),
66    [12] = TPS65090_IRQ(1, 4),
67    [13] = TPS65090_IRQ(1, 5),
68    [14] = TPS65090_IRQ(1, 6),
69    [15] = TPS65090_IRQ(1, 7),
70};
71
72static struct mfd_cell tps65090s[] = {
73    {
74        .name = "tps65090-pmic",
75    },
76    {
77        .name = "tps65090-regulator",
78    },
79};
80
81int tps65090_write(struct device *dev, int reg, uint8_t val)
82{
83    struct tps65090 *tps = dev_get_drvdata(dev);
84    return regmap_write(tps->rmap, reg, val);
85}
86EXPORT_SYMBOL_GPL(tps65090_write);
87
88int tps65090_read(struct device *dev, int reg, uint8_t *val)
89{
90    struct tps65090 *tps = dev_get_drvdata(dev);
91    unsigned int temp_val;
92    int ret;
93    ret = regmap_read(tps->rmap, reg, &temp_val);
94    if (!ret)
95        *val = temp_val;
96    return ret;
97}
98EXPORT_SYMBOL_GPL(tps65090_read);
99
100int tps65090_set_bits(struct device *dev, int reg, uint8_t bit_num)
101{
102    struct tps65090 *tps = dev_get_drvdata(dev);
103    return regmap_update_bits(tps->rmap, reg, BIT(bit_num), ~0u);
104}
105EXPORT_SYMBOL_GPL(tps65090_set_bits);
106
107int tps65090_clr_bits(struct device *dev, int reg, uint8_t bit_num)
108{
109    struct tps65090 *tps = dev_get_drvdata(dev);
110    return regmap_update_bits(tps->rmap, reg, BIT(bit_num), 0u);
111}
112EXPORT_SYMBOL_GPL(tps65090_clr_bits);
113
114static void tps65090_irq_lock(struct irq_data *data)
115{
116    struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
117
118    mutex_lock(&tps65090->irq_lock);
119}
120
121static void tps65090_irq_mask(struct irq_data *irq_data)
122{
123    struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
124    unsigned int __irq = irq_data->hwirq;
125    const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
126
127    tps65090_set_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
128        data->mask_pos);
129}
130
131static void tps65090_irq_unmask(struct irq_data *irq_data)
132{
133    struct tps65090 *tps65090 = irq_data_get_irq_chip_data(irq_data);
134    unsigned int __irq = irq_data->irq - tps65090->irq_base;
135    const struct tps65090_irq_data *data = &tps65090_irqs[__irq];
136
137    tps65090_clr_bits(tps65090->dev, (TPS65090_INT_MSK + data->mask_reg),
138        data->mask_pos);
139}
140
141static void tps65090_irq_sync_unlock(struct irq_data *data)
142{
143    struct tps65090 *tps65090 = irq_data_get_irq_chip_data(data);
144
145    mutex_unlock(&tps65090->irq_lock);
146}
147
148static irqreturn_t tps65090_irq(int irq, void *data)
149{
150    struct tps65090 *tps65090 = data;
151    int ret = 0;
152    u8 status, mask;
153    unsigned long int acks = 0;
154    int i;
155
156    for (i = 0; i < NUM_INT_REG; i++) {
157        ret = tps65090_read(tps65090->dev, TPS65090_INT_MSK + i, &mask);
158        if (ret < 0) {
159            dev_err(tps65090->dev,
160                "failed to read mask reg [addr:%d]\n",
161                TPS65090_INT_MSK + i);
162            return IRQ_NONE;
163        }
164        ret = tps65090_read(tps65090->dev, TPS65090_INT_STS + i,
165            &status);
166        if (ret < 0) {
167            dev_err(tps65090->dev,
168                "failed to read status reg [addr:%d]\n",
169                 TPS65090_INT_STS + i);
170            return IRQ_NONE;
171        }
172        if (status) {
173            /* Ack only those interrupts which are not masked */
174            status &= (~mask);
175            ret = tps65090_write(tps65090->dev,
176                    TPS65090_INT_STS + i, status);
177            if (ret < 0) {
178                dev_err(tps65090->dev,
179                    "failed to write interrupt status\n");
180                return IRQ_NONE;
181            }
182            acks |= (status << (i * 8));
183        }
184    }
185
186    for_each_set_bit(i, &acks, ARRAY_SIZE(tps65090_irqs))
187        handle_nested_irq(tps65090->irq_base + i);
188    return acks ? IRQ_HANDLED : IRQ_NONE;
189}
190
191static int __devinit tps65090_irq_init(struct tps65090 *tps65090, int irq,
192    int irq_base)
193{
194    int i, ret;
195
196    if (!irq_base) {
197        dev_err(tps65090->dev, "IRQ base not set\n");
198        return -EINVAL;
199    }
200
201    mutex_init(&tps65090->irq_lock);
202
203    for (i = 0; i < NUM_INT_REG; i++)
204        tps65090_write(tps65090->dev, TPS65090_INT_MSK + i, 0xFF);
205
206    for (i = 0; i < NUM_INT_REG; i++)
207        tps65090_write(tps65090->dev, TPS65090_INT_STS + i, 0xff);
208
209    tps65090->irq_base = irq_base;
210    tps65090->irq_chip.name = "tps65090";
211    tps65090->irq_chip.irq_mask = tps65090_irq_mask;
212    tps65090->irq_chip.irq_unmask = tps65090_irq_unmask;
213    tps65090->irq_chip.irq_bus_lock = tps65090_irq_lock;
214    tps65090->irq_chip.irq_bus_sync_unlock = tps65090_irq_sync_unlock;
215
216    for (i = 0; i < ARRAY_SIZE(tps65090_irqs); i++) {
217        int __irq = i + tps65090->irq_base;
218        irq_set_chip_data(__irq, tps65090);
219        irq_set_chip_and_handler(__irq, &tps65090->irq_chip,
220                     handle_simple_irq);
221        irq_set_nested_thread(__irq, 1);
222#ifdef CONFIG_ARM
223        set_irq_flags(__irq, IRQF_VALID);
224#endif
225    }
226
227    ret = request_threaded_irq(irq, NULL, tps65090_irq, IRQF_ONESHOT,
228                "tps65090", tps65090);
229    if (!ret) {
230        device_init_wakeup(tps65090->dev, 1);
231        enable_irq_wake(irq);
232    }
233
234    return ret;
235}
236
237static bool is_volatile_reg(struct device *dev, unsigned int reg)
238{
239    if ((reg == TPS65090_INT_STS) || (reg == TPS65090_INT_STS))
240        return true;
241    else
242        return false;
243}
244
245static const struct regmap_config tps65090_regmap_config = {
246    .reg_bits = 8,
247    .val_bits = 8,
248    .max_register = TOTAL_NUM_REG,
249    .num_reg_defaults_raw = TOTAL_NUM_REG,
250    .cache_type = REGCACHE_RBTREE,
251    .volatile_reg = is_volatile_reg,
252};
253
254static int __devinit tps65090_i2c_probe(struct i2c_client *client,
255                    const struct i2c_device_id *id)
256{
257    struct tps65090_platform_data *pdata = client->dev.platform_data;
258    struct tps65090 *tps65090;
259    int ret;
260
261    if (!pdata) {
262        dev_err(&client->dev, "tps65090 requires platform data\n");
263        return -EINVAL;
264    }
265
266    tps65090 = devm_kzalloc(&client->dev, sizeof(struct tps65090),
267        GFP_KERNEL);
268    if (tps65090 == NULL)
269        return -ENOMEM;
270
271    tps65090->client = client;
272    tps65090->dev = &client->dev;
273    i2c_set_clientdata(client, tps65090);
274
275    mutex_init(&tps65090->lock);
276
277    if (client->irq) {
278        ret = tps65090_irq_init(tps65090, client->irq, pdata->irq_base);
279        if (ret) {
280            dev_err(&client->dev, "IRQ init failed with err: %d\n",
281                ret);
282            goto err_exit;
283        }
284    }
285
286    tps65090->rmap = devm_regmap_init_i2c(tps65090->client,
287                          &tps65090_regmap_config);
288    if (IS_ERR(tps65090->rmap)) {
289        ret = PTR_ERR(tps65090->rmap);
290        dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
291        goto err_irq_exit;
292    }
293
294    ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
295                  ARRAY_SIZE(tps65090s), NULL, 0, NULL);
296    if (ret) {
297        dev_err(&client->dev, "add mfd devices failed with err: %d\n",
298            ret);
299        goto err_irq_exit;
300    }
301
302    return 0;
303
304err_irq_exit:
305    if (client->irq)
306        free_irq(client->irq, tps65090);
307err_exit:
308    return ret;
309}
310
311static int __devexit tps65090_i2c_remove(struct i2c_client *client)
312{
313    struct tps65090 *tps65090 = i2c_get_clientdata(client);
314
315    mfd_remove_devices(tps65090->dev);
316    if (client->irq)
317        free_irq(client->irq, tps65090);
318
319    return 0;
320}
321
322#ifdef CONFIG_PM_SLEEP
323static int tps65090_suspend(struct device *dev)
324{
325    struct i2c_client *client = to_i2c_client(dev);
326    if (client->irq)
327        disable_irq(client->irq);
328    return 0;
329}
330
331static int tps65090_resume(struct device *dev)
332{
333    struct i2c_client *client = to_i2c_client(dev);
334    if (client->irq)
335        enable_irq(client->irq);
336    return 0;
337}
338#endif
339
340static const struct dev_pm_ops tps65090_pm_ops = {
341    SET_SYSTEM_SLEEP_PM_OPS(tps65090_suspend, tps65090_resume)
342};
343
344static const struct i2c_device_id tps65090_id_table[] = {
345    { "tps65090", 0 },
346    { },
347};
348MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
349
350static struct i2c_driver tps65090_driver = {
351    .driver = {
352        .name = "tps65090",
353        .owner = THIS_MODULE,
354        .pm = &tps65090_pm_ops,
355    },
356    .probe = tps65090_i2c_probe,
357    .remove = __devexit_p(tps65090_i2c_remove),
358    .id_table = tps65090_id_table,
359};
360
361static int __init tps65090_init(void)
362{
363    return i2c_add_driver(&tps65090_driver);
364}
365subsys_initcall(tps65090_init);
366
367static void __exit tps65090_exit(void)
368{
369    i2c_del_driver(&tps65090_driver);
370}
371module_exit(tps65090_exit);
372
373MODULE_DESCRIPTION("TPS65090 core driver");
374MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
375MODULE_LICENSE("GPL v2");
376

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