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Linux/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/of.h>
 29 #include <linux/of_device.h>
 30 #include <linux/err.h>
 31 
 32 #define NUM_INT_REG 2
 33 
 34 #define TPS65090_INT1_MASK_VAC_STATUS_CHANGE            1
 35 #define TPS65090_INT1_MASK_VSYS_STATUS_CHANGE           2
 36 #define TPS65090_INT1_MASK_BAT_STATUS_CHANGE            3
 37 #define TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE       4
 38 #define TPS65090_INT1_MASK_CHARGING_COMPLETE            5
 39 #define TPS65090_INT1_MASK_OVERLOAD_DCDC1               6
 40 #define TPS65090_INT1_MASK_OVERLOAD_DCDC2               7
 41 #define TPS65090_INT2_MASK_OVERLOAD_DCDC3               0
 42 #define TPS65090_INT2_MASK_OVERLOAD_FET1                1
 43 #define TPS65090_INT2_MASK_OVERLOAD_FET2                2
 44 #define TPS65090_INT2_MASK_OVERLOAD_FET3                3
 45 #define TPS65090_INT2_MASK_OVERLOAD_FET4                4
 46 #define TPS65090_INT2_MASK_OVERLOAD_FET5                5
 47 #define TPS65090_INT2_MASK_OVERLOAD_FET6                6
 48 #define TPS65090_INT2_MASK_OVERLOAD_FET7                7
 49 
 50 static struct resource charger_resources[] = {
 51         {
 52                 .start  = TPS65090_IRQ_VAC_STATUS_CHANGE,
 53                 .end    = TPS65090_IRQ_VAC_STATUS_CHANGE,
 54                 .flags  = IORESOURCE_IRQ,
 55         }
 56 };
 57 
 58 enum tps65090_cells {
 59         PMIC = 0,
 60         CHARGER = 1,
 61 };
 62 
 63 static struct mfd_cell tps65090s[] = {
 64         [PMIC] = {
 65                 .name = "tps65090-pmic",
 66         },
 67         [CHARGER] = {
 68                 .name = "tps65090-charger",
 69                 .num_resources = ARRAY_SIZE(charger_resources),
 70                 .resources = &charger_resources[0],
 71                 .of_compatible = "ti,tps65090-charger",
 72         },
 73 };
 74 
 75 static const struct regmap_irq tps65090_irqs[] = {
 76         /* INT1 IRQs*/
 77         [TPS65090_IRQ_VAC_STATUS_CHANGE] = {
 78                 .mask = TPS65090_INT1_MASK_VAC_STATUS_CHANGE,
 79         },
 80         [TPS65090_IRQ_VSYS_STATUS_CHANGE] = {
 81                 .mask = TPS65090_INT1_MASK_VSYS_STATUS_CHANGE,
 82         },
 83         [TPS65090_IRQ_BAT_STATUS_CHANGE] = {
 84                 .mask = TPS65090_INT1_MASK_BAT_STATUS_CHANGE,
 85         },
 86         [TPS65090_IRQ_CHARGING_STATUS_CHANGE] = {
 87                 .mask = TPS65090_INT1_MASK_CHARGING_STATUS_CHANGE,
 88         },
 89         [TPS65090_IRQ_CHARGING_COMPLETE] = {
 90                 .mask = TPS65090_INT1_MASK_CHARGING_COMPLETE,
 91         },
 92         [TPS65090_IRQ_OVERLOAD_DCDC1] = {
 93                 .mask = TPS65090_INT1_MASK_OVERLOAD_DCDC1,
 94         },
 95         [TPS65090_IRQ_OVERLOAD_DCDC2] = {
 96                 .mask = TPS65090_INT1_MASK_OVERLOAD_DCDC2,
 97         },
 98         /* INT2 IRQs*/
 99         [TPS65090_IRQ_OVERLOAD_DCDC3] = {
100                 .reg_offset = 1,
101                 .mask = TPS65090_INT2_MASK_OVERLOAD_DCDC3,
102         },
103         [TPS65090_IRQ_OVERLOAD_FET1] = {
104                 .reg_offset = 1,
105                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET1,
106         },
107         [TPS65090_IRQ_OVERLOAD_FET2] = {
108                 .reg_offset = 1,
109                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET2,
110         },
111         [TPS65090_IRQ_OVERLOAD_FET3] = {
112                 .reg_offset = 1,
113                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET3,
114         },
115         [TPS65090_IRQ_OVERLOAD_FET4] = {
116                 .reg_offset = 1,
117                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET4,
118         },
119         [TPS65090_IRQ_OVERLOAD_FET5] = {
120                 .reg_offset = 1,
121                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET5,
122         },
123         [TPS65090_IRQ_OVERLOAD_FET6] = {
124                 .reg_offset = 1,
125                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET6,
126         },
127         [TPS65090_IRQ_OVERLOAD_FET7] = {
128                 .reg_offset = 1,
129                 .mask = TPS65090_INT2_MASK_OVERLOAD_FET7,
130         },
131 };
132 
133 static struct regmap_irq_chip tps65090_irq_chip = {
134         .name = "tps65090",
135         .irqs = tps65090_irqs,
136         .num_irqs = ARRAY_SIZE(tps65090_irqs),
137         .num_regs = NUM_INT_REG,
138         .status_base = TPS65090_REG_INTR_STS,
139         .mask_base = TPS65090_REG_INTR_MASK,
140         .mask_invert = true,
141 };
142 
143 static bool is_volatile_reg(struct device *dev, unsigned int reg)
144 {
145         /* Nearly all registers have status bits mixed in, except a few */
146         switch (reg) {
147         case TPS65090_REG_INTR_MASK:
148         case TPS65090_REG_INTR_MASK2:
149         case TPS65090_REG_CG_CTRL0:
150         case TPS65090_REG_CG_CTRL1:
151         case TPS65090_REG_CG_CTRL2:
152         case TPS65090_REG_CG_CTRL3:
153         case TPS65090_REG_CG_CTRL4:
154         case TPS65090_REG_CG_CTRL5:
155                 return false;
156         }
157         return true;
158 }
159 
160 static const struct regmap_config tps65090_regmap_config = {
161         .reg_bits = 8,
162         .val_bits = 8,
163         .max_register = TPS65090_MAX_REG,
164         .num_reg_defaults_raw = TPS65090_NUM_REGS,
165         .cache_type = REGCACHE_RBTREE,
166         .volatile_reg = is_volatile_reg,
167 };
168 
169 #ifdef CONFIG_OF
170 static const struct of_device_id tps65090_of_match[] = {
171         { .compatible = "ti,tps65090",},
172         {},
173 };
174 MODULE_DEVICE_TABLE(of, tps65090_of_match);
175 #endif
176 
177 static int tps65090_i2c_probe(struct i2c_client *client,
178                               const struct i2c_device_id *id)
179 {
180         struct tps65090_platform_data *pdata = dev_get_platdata(&client->dev);
181         int irq_base = 0;
182         struct tps65090 *tps65090;
183         int ret;
184 
185         if (!pdata && !client->dev.of_node) {
186                 dev_err(&client->dev,
187                         "tps65090 requires platform data or of_node\n");
188                 return -EINVAL;
189         }
190 
191         if (pdata)
192                 irq_base = pdata->irq_base;
193 
194         tps65090 = devm_kzalloc(&client->dev, sizeof(*tps65090), GFP_KERNEL);
195         if (!tps65090) {
196                 dev_err(&client->dev, "mem alloc for tps65090 failed\n");
197                 return -ENOMEM;
198         }
199 
200         tps65090->dev = &client->dev;
201         i2c_set_clientdata(client, tps65090);
202 
203         tps65090->rmap = devm_regmap_init_i2c(client, &tps65090_regmap_config);
204         if (IS_ERR(tps65090->rmap)) {
205                 ret = PTR_ERR(tps65090->rmap);
206                 dev_err(&client->dev, "regmap_init failed with err: %d\n", ret);
207                 return ret;
208         }
209 
210         if (client->irq) {
211                 ret = regmap_add_irq_chip(tps65090->rmap, client->irq,
212                                           IRQF_ONESHOT | IRQF_TRIGGER_LOW, irq_base,
213                                           &tps65090_irq_chip, &tps65090->irq_data);
214                 if (ret) {
215                         dev_err(&client->dev,
216                                 "IRQ init failed with err: %d\n", ret);
217                         return ret;
218                 }
219         } else {
220                 /* Don't tell children they have an IRQ that'll never fire */
221                 tps65090s[CHARGER].num_resources = 0;
222         }
223 
224         ret = mfd_add_devices(tps65090->dev, -1, tps65090s,
225                               ARRAY_SIZE(tps65090s), NULL,
226                               0, regmap_irq_get_domain(tps65090->irq_data));
227         if (ret) {
228                 dev_err(&client->dev, "add mfd devices failed with err: %d\n",
229                         ret);
230                 goto err_irq_exit;
231         }
232 
233         return 0;
234 
235 err_irq_exit:
236         if (client->irq)
237                 regmap_del_irq_chip(client->irq, tps65090->irq_data);
238         return ret;
239 }
240 
241 static int tps65090_i2c_remove(struct i2c_client *client)
242 {
243         struct tps65090 *tps65090 = i2c_get_clientdata(client);
244 
245         mfd_remove_devices(tps65090->dev);
246         if (client->irq)
247                 regmap_del_irq_chip(client->irq, tps65090->irq_data);
248 
249         return 0;
250 }
251 
252 static const struct i2c_device_id tps65090_id_table[] = {
253         { "tps65090", 0 },
254         { },
255 };
256 MODULE_DEVICE_TABLE(i2c, tps65090_id_table);
257 
258 static struct i2c_driver tps65090_driver = {
259         .driver = {
260                 .name   = "tps65090",
261                 .of_match_table = of_match_ptr(tps65090_of_match),
262         },
263         .probe          = tps65090_i2c_probe,
264         .remove         = tps65090_i2c_remove,
265         .id_table       = tps65090_id_table,
266 };
267 
268 static int __init tps65090_init(void)
269 {
270         return i2c_add_driver(&tps65090_driver);
271 }
272 subsys_initcall(tps65090_init);
273 
274 static void __exit tps65090_exit(void)
275 {
276         i2c_del_driver(&tps65090_driver);
277 }
278 module_exit(tps65090_exit);
279 
280 MODULE_DESCRIPTION("TPS65090 core driver");
281 MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
282 MODULE_LICENSE("GPL v2");
283 

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