xsk: Add overflow check for u64 division, stored into u32
[linux/fpc-iii.git] / drivers / misc / lis3lv02d / lis3lv02d_i2c.c
blob14b7d539fed6882aa2d82c200afd9c4093a2e351
1 /*
2 * drivers/hwmon/lis3lv02d_i2c.c
4 * Implements I2C interface for lis3lv02d (STMicroelectronics) accelerometer.
5 * Driver is based on corresponding SPI driver written by Daniel Mack
6 * (lis3lv02d_spi.c (C) 2009 Daniel Mack <daniel@caiaq.de> ).
8 * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
10 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * version 2 as published by the Free Software Foundation.
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
24 * 02110-1301 USA
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/err.h>
30 #include <linux/i2c.h>
31 #include <linux/pm_runtime.h>
32 #include <linux/delay.h>
33 #include <linux/of.h>
34 #include <linux/of_platform.h>
35 #include <linux/of_device.h>
37 #include "lis3lv02d.h"
39 #define DRV_NAME "lis3lv02d_i2c"
41 static const char reg_vdd[] = "Vdd";
42 static const char reg_vdd_io[] = "Vdd_IO";
44 static int lis3_reg_ctrl(struct lis3lv02d *lis3, bool state)
46 int ret;
47 if (state == LIS3_REG_OFF) {
48 ret = regulator_bulk_disable(ARRAY_SIZE(lis3->regulators),
49 lis3->regulators);
50 } else {
51 ret = regulator_bulk_enable(ARRAY_SIZE(lis3->regulators),
52 lis3->regulators);
53 /* Chip needs time to wakeup. Not mentioned in datasheet */
54 usleep_range(10000, 20000);
56 return ret;
59 static inline s32 lis3_i2c_write(struct lis3lv02d *lis3, int reg, u8 value)
61 struct i2c_client *c = lis3->bus_priv;
62 return i2c_smbus_write_byte_data(c, reg, value);
65 static inline s32 lis3_i2c_read(struct lis3lv02d *lis3, int reg, u8 *v)
67 struct i2c_client *c = lis3->bus_priv;
68 *v = i2c_smbus_read_byte_data(c, reg);
69 return 0;
72 static inline s32 lis3_i2c_blockread(struct lis3lv02d *lis3, int reg, int len,
73 u8 *v)
75 struct i2c_client *c = lis3->bus_priv;
76 reg |= (1 << 7); /* 7th bit enables address auto incrementation */
77 return i2c_smbus_read_i2c_block_data(c, reg, len, v);
80 static int lis3_i2c_init(struct lis3lv02d *lis3)
82 u8 reg;
83 int ret;
85 lis3_reg_ctrl(lis3, LIS3_REG_ON);
87 lis3->read(lis3, WHO_AM_I, &reg);
88 if (reg != lis3->whoami)
89 printk(KERN_ERR "lis3: power on failure\n");
91 /* power up the device */
92 ret = lis3->read(lis3, CTRL_REG1, &reg);
93 if (ret < 0)
94 return ret;
96 if (lis3->whoami == WAI_3DLH)
97 reg |= CTRL1_PM0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
98 else
99 reg |= CTRL1_PD0 | CTRL1_Xen | CTRL1_Yen | CTRL1_Zen;
101 return lis3->write(lis3, CTRL_REG1, reg);
104 /* Default axis mapping but it can be overwritten by platform data */
105 static union axis_conversion lis3lv02d_axis_map =
106 { .as_array = { LIS3_DEV_X, LIS3_DEV_Y, LIS3_DEV_Z } };
108 #ifdef CONFIG_OF
109 static const struct of_device_id lis3lv02d_i2c_dt_ids[] = {
110 { .compatible = "st,lis3lv02d" },
113 MODULE_DEVICE_TABLE(of, lis3lv02d_i2c_dt_ids);
114 #endif
116 static int lis3lv02d_i2c_probe(struct i2c_client *client,
117 const struct i2c_device_id *id)
119 int ret = 0;
120 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
122 #ifdef CONFIG_OF
123 if (of_match_device(lis3lv02d_i2c_dt_ids, &client->dev)) {
124 lis3_dev.of_node = client->dev.of_node;
125 ret = lis3lv02d_init_dt(&lis3_dev);
126 if (ret)
127 return ret;
128 pdata = lis3_dev.pdata;
130 #endif
132 if (pdata) {
133 if ((pdata->driver_features & LIS3_USE_BLOCK_READ) &&
134 (i2c_check_functionality(client->adapter,
135 I2C_FUNC_SMBUS_I2C_BLOCK)))
136 lis3_dev.blkread = lis3_i2c_blockread;
138 if (pdata->axis_x)
139 lis3lv02d_axis_map.x = pdata->axis_x;
141 if (pdata->axis_y)
142 lis3lv02d_axis_map.y = pdata->axis_y;
144 if (pdata->axis_z)
145 lis3lv02d_axis_map.z = pdata->axis_z;
147 if (pdata->setup_resources)
148 ret = pdata->setup_resources();
150 if (ret)
151 goto fail;
154 lis3_dev.regulators[0].supply = reg_vdd;
155 lis3_dev.regulators[1].supply = reg_vdd_io;
156 ret = regulator_bulk_get(&client->dev,
157 ARRAY_SIZE(lis3_dev.regulators),
158 lis3_dev.regulators);
159 if (ret < 0)
160 goto fail;
162 lis3_dev.pdata = pdata;
163 lis3_dev.bus_priv = client;
164 lis3_dev.init = lis3_i2c_init;
165 lis3_dev.read = lis3_i2c_read;
166 lis3_dev.write = lis3_i2c_write;
167 lis3_dev.irq = client->irq;
168 lis3_dev.ac = lis3lv02d_axis_map;
169 lis3_dev.pm_dev = &client->dev;
171 i2c_set_clientdata(client, &lis3_dev);
173 /* Provide power over the init call */
174 lis3_reg_ctrl(&lis3_dev, LIS3_REG_ON);
176 ret = lis3lv02d_init_device(&lis3_dev);
178 lis3_reg_ctrl(&lis3_dev, LIS3_REG_OFF);
180 if (ret)
181 goto fail2;
182 return 0;
184 fail2:
185 regulator_bulk_free(ARRAY_SIZE(lis3_dev.regulators),
186 lis3_dev.regulators);
187 fail:
188 if (pdata && pdata->release_resources)
189 pdata->release_resources();
190 return ret;
193 static int lis3lv02d_i2c_remove(struct i2c_client *client)
195 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
196 struct lis3lv02d_platform_data *pdata = client->dev.platform_data;
198 if (pdata && pdata->release_resources)
199 pdata->release_resources();
201 lis3lv02d_joystick_disable(lis3);
202 lis3lv02d_remove_fs(&lis3_dev);
204 regulator_bulk_free(ARRAY_SIZE(lis3->regulators),
205 lis3_dev.regulators);
206 return 0;
209 #ifdef CONFIG_PM_SLEEP
210 static int lis3lv02d_i2c_suspend(struct device *dev)
212 struct i2c_client *client = to_i2c_client(dev);
213 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
215 if (!lis3->pdata || !lis3->pdata->wakeup_flags)
216 lis3lv02d_poweroff(lis3);
217 return 0;
220 static int lis3lv02d_i2c_resume(struct device *dev)
222 struct i2c_client *client = to_i2c_client(dev);
223 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
226 * pm_runtime documentation says that devices should always
227 * be powered on at resume. Pm_runtime turns them off after system
228 * wide resume is complete.
230 if (!lis3->pdata || !lis3->pdata->wakeup_flags ||
231 pm_runtime_suspended(dev))
232 lis3lv02d_poweron(lis3);
234 return 0;
236 #endif /* CONFIG_PM_SLEEP */
238 #ifdef CONFIG_PM
239 static int lis3_i2c_runtime_suspend(struct device *dev)
241 struct i2c_client *client = to_i2c_client(dev);
242 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
244 lis3lv02d_poweroff(lis3);
245 return 0;
248 static int lis3_i2c_runtime_resume(struct device *dev)
250 struct i2c_client *client = to_i2c_client(dev);
251 struct lis3lv02d *lis3 = i2c_get_clientdata(client);
253 lis3lv02d_poweron(lis3);
254 return 0;
256 #endif /* CONFIG_PM */
258 static const struct i2c_device_id lis3lv02d_id[] = {
259 {"lis3lv02d", LIS3LV02D},
260 {"lis331dlh", LIS331DLH},
264 MODULE_DEVICE_TABLE(i2c, lis3lv02d_id);
266 static const struct dev_pm_ops lis3_pm_ops = {
267 SET_SYSTEM_SLEEP_PM_OPS(lis3lv02d_i2c_suspend,
268 lis3lv02d_i2c_resume)
269 SET_RUNTIME_PM_OPS(lis3_i2c_runtime_suspend,
270 lis3_i2c_runtime_resume,
271 NULL)
274 static struct i2c_driver lis3lv02d_i2c_driver = {
275 .driver = {
276 .name = DRV_NAME,
277 .pm = &lis3_pm_ops,
278 .of_match_table = of_match_ptr(lis3lv02d_i2c_dt_ids),
280 .probe = lis3lv02d_i2c_probe,
281 .remove = lis3lv02d_i2c_remove,
282 .id_table = lis3lv02d_id,
285 module_i2c_driver(lis3lv02d_i2c_driver);
287 MODULE_AUTHOR("Nokia Corporation");
288 MODULE_DESCRIPTION("lis3lv02d I2C interface");
289 MODULE_LICENSE("GPL");