Commit | Line | Data |
---|---|---|
c7b76dce AK |
1 | /* |
2 | * Retu MFD driver | |
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 */ | |
36 | #define RETU_REG_IMR 0x02 /* Interrupt mask */ | |
37 | ||
38 | /* Interrupt sources */ | |
39 | #define RETU_INT_PWR 0 /* Power button */ | |
40 | ||
41 | struct retu_dev { | |
42 | struct regmap *regmap; | |
43 | struct device *dev; | |
44 | struct mutex mutex; | |
45 | struct regmap_irq_chip_data *irq_data; | |
46 | }; | |
47 | ||
48 | static struct resource retu_pwrbutton_res[] = { | |
49 | { | |
50 | .name = "retu-pwrbutton", | |
51 | .start = RETU_INT_PWR, | |
52 | .end = RETU_INT_PWR, | |
53 | .flags = IORESOURCE_IRQ, | |
54 | }, | |
55 | }; | |
56 | ||
57 | static struct mfd_cell retu_devs[] = { | |
58 | { | |
59 | .name = "retu-wdt" | |
60 | }, | |
61 | { | |
62 | .name = "retu-pwrbutton", | |
63 | .resources = retu_pwrbutton_res, | |
64 | .num_resources = ARRAY_SIZE(retu_pwrbutton_res), | |
65 | } | |
66 | }; | |
67 | ||
68 | static struct regmap_irq retu_irqs[] = { | |
69 | [RETU_INT_PWR] = { | |
70 | .mask = 1 << RETU_INT_PWR, | |
71 | } | |
72 | }; | |
73 | ||
74 | static struct regmap_irq_chip retu_irq_chip = { | |
75 | .name = "RETU", | |
76 | .irqs = retu_irqs, | |
77 | .num_irqs = ARRAY_SIZE(retu_irqs), | |
78 | .num_regs = 1, | |
79 | .status_base = RETU_REG_IDR, | |
80 | .mask_base = RETU_REG_IMR, | |
81 | .ack_base = RETU_REG_IDR, | |
82 | }; | |
83 | ||
84 | /* Retu device registered for the power off. */ | |
85 | static struct retu_dev *retu_pm_power_off; | |
86 | ||
87 | int retu_read(struct retu_dev *rdev, u8 reg) | |
88 | { | |
89 | int ret; | |
90 | int value; | |
91 | ||
92 | mutex_lock(&rdev->mutex); | |
93 | ret = regmap_read(rdev->regmap, reg, &value); | |
94 | mutex_unlock(&rdev->mutex); | |
95 | ||
96 | return ret ? ret : value; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(retu_read); | |
99 | ||
100 | int retu_write(struct retu_dev *rdev, u8 reg, u16 data) | |
101 | { | |
102 | int ret; | |
103 | ||
104 | mutex_lock(&rdev->mutex); | |
105 | ret = regmap_write(rdev->regmap, reg, data); | |
106 | mutex_unlock(&rdev->mutex); | |
107 | ||
108 | return ret; | |
109 | } | |
110 | EXPORT_SYMBOL_GPL(retu_write); | |
111 | ||
112 | static void retu_power_off(void) | |
113 | { | |
114 | struct retu_dev *rdev = retu_pm_power_off; | |
115 | int reg; | |
116 | ||
117 | mutex_lock(&retu_pm_power_off->mutex); | |
118 | ||
119 | /* Ignore power button state */ | |
120 | regmap_read(rdev->regmap, RETU_REG_CC1, ®); | |
121 | regmap_write(rdev->regmap, RETU_REG_CC1, reg | 2); | |
122 | ||
123 | /* Expire watchdog immediately */ | |
124 | regmap_write(rdev->regmap, RETU_REG_WATCHDOG, 0); | |
125 | ||
126 | /* Wait for poweroff */ | |
127 | for (;;) | |
128 | cpu_relax(); | |
129 | ||
130 | mutex_unlock(&retu_pm_power_off->mutex); | |
131 | } | |
132 | ||
133 | static int retu_regmap_read(void *context, const void *reg, size_t reg_size, | |
134 | void *val, size_t val_size) | |
135 | { | |
136 | int ret; | |
137 | struct device *dev = context; | |
138 | struct i2c_client *i2c = to_i2c_client(dev); | |
139 | ||
140 | BUG_ON(reg_size != 1 || val_size != 2); | |
141 | ||
142 | ret = i2c_smbus_read_word_data(i2c, *(u8 const *)reg); | |
143 | if (ret < 0) | |
144 | return ret; | |
145 | ||
146 | *(u16 *)val = ret; | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int retu_regmap_write(void *context, const void *data, size_t count) | |
151 | { | |
152 | u8 reg; | |
153 | u16 val; | |
154 | struct device *dev = context; | |
155 | struct i2c_client *i2c = to_i2c_client(dev); | |
156 | ||
157 | BUG_ON(count != sizeof(reg) + sizeof(val)); | |
158 | memcpy(®, data, sizeof(reg)); | |
159 | memcpy(&val, data + sizeof(reg), sizeof(val)); | |
160 | return i2c_smbus_write_word_data(i2c, reg, val); | |
161 | } | |
162 | ||
163 | static struct regmap_bus retu_bus = { | |
164 | .read = retu_regmap_read, | |
165 | .write = retu_regmap_write, | |
166 | .val_format_endian_default = REGMAP_ENDIAN_NATIVE, | |
167 | }; | |
168 | ||
169 | static struct regmap_config retu_config = { | |
170 | .reg_bits = 8, | |
171 | .val_bits = 16, | |
172 | }; | |
173 | ||
612b95cd | 174 | static int retu_probe(struct i2c_client *i2c, const struct i2c_device_id *id) |
c7b76dce AK |
175 | { |
176 | struct retu_dev *rdev; | |
177 | int ret; | |
178 | ||
179 | rdev = devm_kzalloc(&i2c->dev, sizeof(*rdev), GFP_KERNEL); | |
180 | if (rdev == NULL) | |
181 | return -ENOMEM; | |
182 | ||
183 | i2c_set_clientdata(i2c, rdev); | |
184 | rdev->dev = &i2c->dev; | |
185 | mutex_init(&rdev->mutex); | |
186 | rdev->regmap = devm_regmap_init(&i2c->dev, &retu_bus, &i2c->dev, | |
187 | &retu_config); | |
188 | if (IS_ERR(rdev->regmap)) | |
189 | return PTR_ERR(rdev->regmap); | |
190 | ||
191 | ret = retu_read(rdev, RETU_REG_ASICR); | |
192 | if (ret < 0) { | |
193 | dev_err(rdev->dev, "could not read Retu revision: %d\n", ret); | |
194 | return ret; | |
195 | } | |
196 | ||
197 | dev_info(rdev->dev, "Retu%s v%d.%d found\n", | |
198 | (ret & RETU_REG_ASICR_VILMA) ? " & Vilma" : "", | |
199 | (ret >> 4) & 0x7, ret & 0xf); | |
200 | ||
201 | /* Mask all RETU interrupts. */ | |
202 | ret = retu_write(rdev, RETU_REG_IMR, 0xffff); | |
203 | if (ret < 0) | |
204 | return ret; | |
205 | ||
206 | ret = regmap_add_irq_chip(rdev->regmap, i2c->irq, IRQF_ONESHOT, -1, | |
207 | &retu_irq_chip, &rdev->irq_data); | |
208 | if (ret < 0) | |
209 | return ret; | |
210 | ||
211 | ret = mfd_add_devices(rdev->dev, -1, retu_devs, ARRAY_SIZE(retu_devs), | |
212 | NULL, regmap_irq_chip_get_base(rdev->irq_data), | |
213 | NULL); | |
214 | if (ret < 0) { | |
215 | regmap_del_irq_chip(i2c->irq, rdev->irq_data); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | if (!pm_power_off) { | |
220 | retu_pm_power_off = rdev; | |
221 | pm_power_off = retu_power_off; | |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
612b95cd | 227 | static int retu_remove(struct i2c_client *i2c) |
c7b76dce AK |
228 | { |
229 | struct retu_dev *rdev = i2c_get_clientdata(i2c); | |
230 | ||
231 | if (retu_pm_power_off == rdev) { | |
232 | pm_power_off = NULL; | |
233 | retu_pm_power_off = NULL; | |
234 | } | |
235 | mfd_remove_devices(rdev->dev); | |
236 | regmap_del_irq_chip(i2c->irq, rdev->irq_data); | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
241 | static const struct i2c_device_id retu_id[] = { | |
242 | { "retu-mfd", 0 }, | |
243 | { } | |
244 | }; | |
245 | MODULE_DEVICE_TABLE(i2c, retu_id); | |
246 | ||
247 | static struct i2c_driver retu_driver = { | |
248 | .driver = { | |
249 | .name = "retu-mfd", | |
250 | .owner = THIS_MODULE, | |
251 | }, | |
252 | .probe = retu_probe, | |
253 | .remove = retu_remove, | |
254 | .id_table = retu_id, | |
255 | }; | |
256 | module_i2c_driver(retu_driver); | |
257 | ||
258 | MODULE_DESCRIPTION("Retu MFD driver"); | |
259 | MODULE_AUTHOR("Juha Yrjölä"); | |
260 | MODULE_AUTHOR("David Weinehall"); | |
261 | MODULE_AUTHOR("Mikko Ylinen"); | |
262 | MODULE_AUTHOR("Aaro Koskinen <aaro.koskinen@iki.fi>"); | |
263 | MODULE_LICENSE("GPL"); |