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c7b76dce | 1 | /* |
95e50f6a | 2 | * Retu/Tahvo MFD driver |
c7b76dce AK |
3 | * |
4 | * Copyright (C) 2004, 2005 Nokia Corporation | |
5 | * | |
6 | * Based on code written by Juha Yrjölä, David Weinehall and Mikko Ylinen. | |
7 | * Rewritten by Aaro Koskinen. | |
8 | * | |
9 | * This file is subject to the terms and conditions of the GNU General | |
10 | * Public License. See the file "COPYING" in the main directory of this | |
11 | * archive for more details. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | */ | |
18 | ||
19 | #include <linux/err.h> | |
20 | #include <linux/i2c.h> | |
21 | #include <linux/irq.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/regmap.h> | |
27 | #include <linux/mfd/core.h> | |
28 | #include <linux/mfd/retu.h> | |
29 | #include <linux/interrupt.h> | |
30 | #include <linux/moduleparam.h> | |
31 | ||
32 | /* Registers */ | |
33 | #define RETU_REG_ASICR 0x00 /* ASIC ID and revision */ | |
34 | #define RETU_REG_ASICR_VILMA (1 << 7) /* Bit indicating Vilma */ | |
35 | #define RETU_REG_IDR 0x01 /* Interrupt ID */ | |
95e50f6a AK |
36 | #define RETU_REG_IMR 0x02 /* Interrupt mask (Retu) */ |
37 | #define TAHVO_REG_IMR 0x03 /* Interrupt mask (Tahvo) */ | |
c7b76dce AK |
38 | |
39 | /* Interrupt sources */ | |
40 | #define RETU_INT_PWR 0 /* Power button */ | |
41 | ||
42 | struct retu_dev { | |
43 | struct regmap *regmap; | |
44 | struct device *dev; | |
45 | struct mutex mutex; | |
46 | struct regmap_irq_chip_data *irq_data; | |
47 | }; | |
48 | ||
49 | static struct resource retu_pwrbutton_res[] = { | |
50 | { | |
51 | .name = "retu-pwrbutton", | |
52 | .start = RETU_INT_PWR, | |
53 | .end = RETU_INT_PWR, | |
54 | .flags = IORESOURCE_IRQ, | |
55 | }, | |
56 | }; | |
57 | ||
58 | static struct mfd_cell retu_devs[] = { | |
59 | { | |
60 | .name = "retu-wdt" | |
61 | }, | |
62 | { | |
63 | .name = "retu-pwrbutton", | |
64 | .resources = retu_pwrbutton_res, | |
65 | .num_resources = ARRAY_SIZE(retu_pwrbutton_res), | |
66 | } | |
67 | }; | |
68 | ||
69 | static struct regmap_irq retu_irqs[] = { | |
70 | [RETU_INT_PWR] = { | |
71 | .mask = 1 << RETU_INT_PWR, | |
72 | } | |
73 | }; | |
74 | ||
75 | static struct regmap_irq_chip retu_irq_chip = { | |
76 | .name = "RETU", | |
77 | .irqs = retu_irqs, | |
78 | .num_irqs = ARRAY_SIZE(retu_irqs), | |
79 | .num_regs = 1, | |
80 | .status_base = RETU_REG_IDR, | |
81 | .mask_base = RETU_REG_IMR, | |
82 | .ack_base = RETU_REG_IDR, | |
83 | }; | |
84 | ||
85 | /* Retu device registered for the power off. */ | |
86 | static struct retu_dev *retu_pm_power_off; | |
87 | ||
95e50f6a AK |
88 | static struct resource tahvo_usb_res[] = { |
89 | { | |
90 | .name = "tahvo-usb", | |
91 | .start = TAHVO_INT_VBUS, | |
92 | .end = TAHVO_INT_VBUS, | |
93 | .flags = IORESOURCE_IRQ, | |
94 | }, | |
95 | }; | |
96 | ||
97 | static struct mfd_cell tahvo_devs[] = { | |
98 | { | |
99 | .name = "tahvo-usb", | |
100 | .resources = tahvo_usb_res, | |
101 | .num_resources = ARRAY_SIZE(tahvo_usb_res), | |
102 | }, | |
103 | }; | |
104 | ||
105 | static struct regmap_irq tahvo_irqs[] = { | |
106 | [TAHVO_INT_VBUS] = { | |
107 | .mask = 1 << TAHVO_INT_VBUS, | |
108 | } | |
109 | }; | |
110 | ||
111 | static struct regmap_irq_chip tahvo_irq_chip = { | |
112 | .name = "TAHVO", | |
113 | .irqs = tahvo_irqs, | |
114 | .num_irqs = ARRAY_SIZE(tahvo_irqs), | |
115 | .num_regs = 1, | |
116 | .status_base = RETU_REG_IDR, | |
117 | .mask_base = TAHVO_REG_IMR, | |
118 | .ack_base = RETU_REG_IDR, | |
119 | }; | |
120 | ||
121 | static const struct retu_data { | |
122 | char *chip_name; | |
123 | char *companion_name; | |
124 | struct regmap_irq_chip *irq_chip; | |
125 | struct mfd_cell *children; | |
126 | int nchildren; | |
127 | } retu_data[] = { | |
128 | [0] = { | |
129 | .chip_name = "Retu", | |
130 | .companion_name = "Vilma", | |
131 | .irq_chip = &retu_irq_chip, | |
132 | .children = retu_devs, | |
133 | .nchildren = ARRAY_SIZE(retu_devs), | |
134 | }, | |
135 | [1] = { | |
136 | .chip_name = "Tahvo", | |
137 | .companion_name = "Betty", | |
138 | .irq_chip = &tahvo_irq_chip, | |
139 | .children = tahvo_devs, | |
140 | .nchildren = ARRAY_SIZE(tahvo_devs), | |
141 | } | |
142 | }; | |
143 | ||
c7b76dce AK |
144 | int retu_read(struct retu_dev *rdev, u8 reg) |
145 | { | |
146 | int ret; | |
147 | int value; | |
148 | ||
149 | mutex_lock(&rdev->mutex); | |
150 | ret = regmap_read(rdev->regmap, reg, &value); | |
151 | mutex_unlock(&rdev->mutex); | |
152 | ||
153 | return ret ? ret : value; | |
154 | } | |
155 | EXPORT_SYMBOL_GPL(retu_read); | |
156 | ||
157 | int retu_write(struct retu_dev *rdev, u8 reg, u16 data) | |
158 | { | |
159 | int ret; | |
160 | ||
161 | mutex_lock(&rdev->mutex); | |
162 | ret = regmap_write(rdev->regmap, reg, data); | |
163 | mutex_unlock(&rdev->mutex); | |
164 | ||
165 | return ret; | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(retu_write); | |
168 | ||
169 | static void retu_power_off(void) | |
170 | { | |
171 | struct retu_dev *rdev = retu_pm_power_off; | |
172 | int reg; | |
173 | ||
174 | mutex_lock(&retu_pm_power_off->mutex); | |
175 | ||
176 | /* Ignore power button state */ | |
177 | regmap_read(rdev->regmap, RETU_REG_CC1, ®); | |
178 | regmap_write(rdev->regmap, RETU_REG_CC1, reg | 2); | |
179 | ||
180 | /* Expire watchdog immediately */ | |
181 | regmap_write(rdev->regmap, RETU_REG_WATCHDOG, 0); | |
182 | ||
183 | /* Wait for poweroff */ | |
184 | for (;;) | |
185 | cpu_relax(); | |
186 | ||
187 | mutex_unlock(&retu_pm_power_off->mutex); | |
188 | } | |
189 | ||
190 | static int retu_regmap_read(void *context, const void *reg, size_t reg_size, | |
191 | void *val, size_t val_size) | |
192 | { | |
193 | int ret; | |
194 | struct device *dev = context; | |
195 | struct i2c_client *i2c = to_i2c_client(dev); | |
196 | ||
197 | BUG_ON(reg_size != 1 || val_size != 2); | |
198 | ||
199 | ret = i2c_smbus_read_word_data(i2c, *(u8 const *)reg); | |
200 | if (ret < 0) | |
201 | return ret; | |
202 | ||
203 | *(u16 *)val = ret; | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static int retu_regmap_write(void *context, const void *data, size_t count) | |
208 | { | |
209 | u8 reg; | |
210 | u16 val; | |
211 | struct device *dev = context; | |
212 | struct i2c_client *i2c = to_i2c_client(dev); | |
213 | ||
214 | BUG_ON(count != sizeof(reg) + sizeof(val)); | |
215 | memcpy(®, data, sizeof(reg)); | |
216 | memcpy(&val, data + sizeof(reg), sizeof(val)); | |
217 | return i2c_smbus_write_word_data(i2c, reg, val); | |
218 | } | |
219 | ||
220 | static struct regmap_bus retu_bus = { | |
221 | .read = retu_regmap_read, | |
222 | .write = retu_regmap_write, | |
223 | .val_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
224 | }; | |
225 | ||
226 | static struct regmap_config retu_config = { | |
227 | .reg_bits = 8, | |
228 | .val_bits = 16, | |
229 | }; | |
230 | ||
612b95cd | 231 | static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id) |
c7b76dce | 232 | { |
95e50f6a | 233 | struct retu_data const *rdat; |
c7b76dce AK |
234 | struct retu_dev *rdev; |
235 | int ret; | |
236 | ||
95e50f6a AK |
237 | if (i2c->addr > ARRAY_SIZE(retu_data)) |
238 | return -ENODEV; | |
239 | rdat = &retu_data[i2c->addr - 1]; | |
240 | ||
c7b76dce AK |
241 | rdev = devm_kzalloc(&i2c->dev, sizeof(*rdev), GFP_KERNEL); |
242 | if (rdev == NULL) | |
243 | return -ENOMEM; | |
244 | ||
245 | i2c_set_clientdata(i2c, rdev); | |
246 | rdev->dev = &i2c->dev; | |
247 | mutex_init(&rdev->mutex); | |
248 | rdev->regmap = devm_regmap_init(&i2c->dev, &retu_bus, &i2c->dev, | |
249 | &retu_config); | |
250 | if (IS_ERR(rdev->regmap)) | |
251 | return PTR_ERR(rdev->regmap); | |
252 | ||
253 | ret = retu_read(rdev, RETU_REG_ASICR); | |
254 | if (ret < 0) { | |
95e50f6a AK |
255 | dev_err(rdev->dev, "could not read %s revision: %d\n", |
256 | rdat->chip_name, ret); | |
c7b76dce AK |
257 | return ret; |
258 | } | |
259 | ||
95e50f6a AK |
260 | dev_info(rdev->dev, "%s%s%s v%d.%d found\n", rdat->chip_name, |
261 | (ret & RETU_REG_ASICR_VILMA) ? " & " : "", | |
262 | (ret & RETU_REG_ASICR_VILMA) ? rdat->companion_name : "", | |
c7b76dce AK |
263 | (ret >> 4) & 0x7, ret & 0xf); |
264 | ||
95e50f6a AK |
265 | /* Mask all interrupts. */ |
266 | ret = retu_write(rdev, rdat->irq_chip->mask_base, 0xffff); | |
c7b76dce AK |
267 | if (ret < 0) |
268 | return ret; | |
269 | ||
270 | ret = regmap_add_irq_chip(rdev->regmap, i2c->irq, IRQF_ONESHOT, -1, | |
95e50f6a | 271 | rdat->irq_chip, &rdev->irq_data); |
c7b76dce AK |
272 | if (ret < 0) |
273 | return ret; | |
274 | ||
95e50f6a | 275 | ret = mfd_add_devices(rdev->dev, -1, rdat->children, rdat->nchildren, |
c7b76dce AK |
276 | NULL, regmap_irq_chip_get_base(rdev->irq_data), |
277 | NULL); | |
278 | if (ret < 0) { | |
279 | regmap_del_irq_chip(i2c->irq, rdev->irq_data); | |
280 | return ret; | |
281 | } | |
282 | ||
95e50f6a | 283 | if (i2c->addr == 1 && !pm_power_off) { |
c7b76dce AK |
284 | retu_pm_power_off = rdev; |
285 | pm_power_off = retu_power_off; | |
286 | } | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
612b95cd | 291 | static int retu_remove(struct i2c_client *i2c) |
c7b76dce AK |
292 | { |
293 | struct retu_dev *rdev = i2c_get_clientdata(i2c); | |
294 | ||
295 | if (retu_pm_power_off == rdev) { | |
296 | pm_power_off = NULL; | |
297 | retu_pm_power_off = NULL; | |
298 | } | |
299 | mfd_remove_devices(rdev->dev); | |
300 | regmap_del_irq_chip(i2c->irq, rdev->irq_data); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static const struct i2c_device_id retu_id[] = { | |
306 | { "retu-mfd", 0 }, | |
95e50f6a | 307 | { "tahvo-mfd", 0 }, |
c7b76dce AK |
308 | { } |
309 | }; | |
310 | MODULE_DEVICE_TABLE(i2c, retu_id); | |
311 | ||
312 | static struct i2c_driver retu_driver = { | |
313 | .driver = { | |
314 | .name = "retu-mfd", | |
315 | .owner = THIS_MODULE, | |
316 | }, | |
317 | .probe = retu_probe, | |
318 | .remove = retu_remove, | |
319 | .id_table = retu_id, | |
320 | }; | |
321 | module_i2c_driver(retu_driver); | |
322 | ||
323 | MODULE_DESCRIPTION("Retu MFD driver"); | |
324 | MODULE_AUTHOR("Juha Yrjölä"); | |
325 | MODULE_AUTHOR("David Weinehall"); | |
326 | MODULE_AUTHOR("Mikko Ylinen"); | |
327 | MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); | |
328 | MODULE_LICENSE("GPL"); |